.\" Man page generated from reStructuredText.
.
.TH "MONGOS" "1" "Aug 16, 2019" "4.2" "mongodb-manual"
.SH NAME
mongos \- MongoDB Sharded Cluster Query Router
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.SS On this page
.INDENT 0.0
.IP \(bu 2
\fI\%Synopsis\fP
.IP \(bu 2
\fI\%Considerations\fP
.IP \(bu 2
\fI\%Options\fP
.UNINDENT
.SH SYNOPSIS
.sp
For a sharded cluster, the \fI\%mongos\fP
instances provide the interface between the client applications and the
sharded cluster. The \fI\%mongos\fP instances route queries and
write operations to the shards. From the perspective of the
application, a \fI\%mongos\fP instance behaves identically to
any other MongoDB instance.
.SH CONSIDERATIONS
.INDENT 0.0
.IP \(bu 2
Never change the name of the \fI\%mongos\fP binary.
.IP \(bu 2
Starting in version 4.0, MongoDB disables support for TLS 1.0
encryption on systems where TLS 1.1+ is available. For
more details, see 4.0\-disable\-tls\&.
.IP \(bu 2
Starting in MongoDB 4.0, the \fI\%mongos\fP binary will crash when
attempting to connect to \fBmongod\fP instances whose
feature compatibility version (fCV) is greater than
that of the \fI\%mongos\fP\&. For example, you cannot connect
a MongoDB 4.0 version \fI\%mongos\fP to a 4.2
sharded cluster with fCV set to 4.2\&. You
can, however, connect a MongoDB 4.0 version
\fI\%mongos\fP to a 4.2 sharded cluster with fCV set to 4.0\&.
.UNINDENT
.SH OPTIONS
.sp
\fBSEE ALSO:\fP
.INDENT 0.0
.INDENT 3.5
conf\-file\-command\-line\-mapping
.UNINDENT
.UNINDENT
.INDENT 0.0
.INDENT 3.5
.IP "Starting in version 4.2"
.INDENT 0.0
.IP \(bu 2
MongoDB deprecates the SSL options and insteads adds new
corresponding TLS options.
.IP \(bu 2
MongoDB adds
\fI\%\-\-tlsClusterCAFile\fP/\fBnet.tls.clusterCAFile\fP\&. (Also availalbe
in 3.4.18+, 3.6.9+, 4.0.3+)
.UNINDENT
.UNINDENT
.UNINDENT
.SS Core Options
.INDENT 0.0
.TP
.B \-\-help, \-h
Returns information on the options and use of \fBmongos\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-version
Returns the \fBmongos\fP release number.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-config <filename>, \-f <filename>
Specifies a configuration file for runtime configuration options. The
configuration file is the preferred method for runtime configuration of
\fBmongos\fP\&. The options are equivalent to the command\-line
configuration options. See /reference/configuration\-options for
more information.
.sp
Ensure the configuration file uses ASCII encoding. The \fBmongos\fP
instance does not support configuration files with non\-ASCII encoding,
including UTF\-8.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-configExpand <none|rest|exec>
\fIDefault\fP: none
.sp
New in version 4.2.

.sp
Enables using Expansion Directives
in configuration files. Expansion directives allow you to set
externally sourced values for configuration file options.
.sp
\fI\%\-\-configExpand\fP supports the following expansion directives:
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
\fBnone\fP
T}	T{
Default. \fBmongos\fP does not expand expansion directives.
\fBmongos\fP fails to start if any configuration file settings
use expansion directives.
T}
_
T{
\fBrest\fP
T}	T{
\fBmongos\fP expands \fB__rest\fP expansion directives when
parsing the configuration file.
T}
_
T{
\fBexec\fP
T}	T{
\fBmongos\fP expands \fB__exec\fP expansion directives when
parsing the configuration file.
T}
_
.TE
.sp
You can specify multiple expansion directives as a comma\-separated
list, e.g. \fBrest, exec\fP\&. If the configuration file contains
expansion directives not specified to \fI\%\-\-configExpand\fP, the \fBmongos\fP
returns an error and terminates.
.sp
See externally\-sourced\-values for configuration files
for more information on expansion directives.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-verbose, \-v
Increases the amount of internal reporting returned on standard output
or in log files. Increase the verbosity with the \fB\-v\fP form by
including the option multiple times, (e.g. \fB\-vvvvv\fP\&.)
.UNINDENT
.INDENT 0.0
.TP
.B \-\-quiet
Runs \fBmongos\fP in a quiet mode that attempts to limit the amount
of output.
.sp
This option suppresses:
.INDENT 7.0
.IP \(bu 2
output from database commands
.IP \(bu 2
replication activity
.IP \(bu 2
connection accepted events
.IP \(bu 2
connection closed events
.UNINDENT
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.INDENT 0.0
.TP
.B \-\-port <port>
\fIDefault\fP: 27017
.sp
The TCP port on which the \fI\%mongos\fP instance listens for
client connections.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-bind_ip <hostnames|ipaddresses|Unix domain socket paths>
\fIDefault\fP: localhost
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Starting in MongoDB 3.6, \fBmongos\fP bind to localhost
by default. See 3.6\-bind\-to\-localhost\&.
.UNINDENT
.UNINDENT
.sp
The hostnames and/or IP addresses and/or full Unix domain socket
paths on which \fBmongos\fP should listen for client connections. You
may attach \fBmongos\fP to any interface. To bind to multiple
addresses, enter a list of comma\-separated values.
.INDENT 7.0
.INDENT 3.5
.SS Example
.sp
\fBlocalhost,/tmp/mongod.sock\fP
.UNINDENT
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.sp
You can specify both IPv4 and IPv6 addresses, or hostnames that
resolve to an IPv4 or IPv6 address.
.INDENT 7.0
.INDENT 3.5
.SS Example
.sp
\fBlocalhost, 2001:0DB8:e132:ba26:0d5c:2774:e7f9:d513\fP
.UNINDENT
.UNINDENT
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
If specifying an IPv6 address \fIor\fP a hostname that resolves to an
IPv6 address to \fI\%\-\-bind_ip\fP, you must start \fBmongos\fP with
\fI\%\-\-ipv6\fP to enable IPv6 support. Specifying an IPv6 address
to \fI\%\-\-bind_ip\fP does not enable IPv6 support.
.UNINDENT
.UNINDENT
.sp
If specifying a
\fI\%link\-local IPv6 address\fP
(\fBfe80::/10\fP), you must append the
\fI\%zone index\fP
to that address (i.e. \fBfe80::<address>%<adapter\-name>\fP).
.INDENT 7.0
.INDENT 3.5
.SS Example
.sp
\fBlocalhost,fe80::a00:27ff:fee0:1fcf%enp0s3\fP
.UNINDENT
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.INDENT 7.0
.INDENT 3.5
.SS Tip
.sp
When possible, use a logical DNS hostname instead of an ip address,
particularly when configuring replica set members or sharded cluster
members. The use of logical DNS hostnames avoids configuration
changes due to ip address changes.
.UNINDENT
.UNINDENT
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
Before binding to a non\-localhost (e.g. publicly accessible)
IP address, ensure you have secured your cluster from unauthorized
access. For a complete list of security recommendations, see
/administration/security\-checklist\&. At minimum, consider
enabling authentication and
hardening network infrastructure\&.
.UNINDENT
.UNINDENT
.sp
For more information about IP Binding, refer to the
/core/security\-mongodb\-configuration documentation.
.sp
To bind to all IPv4 addresses, enter \fB0.0.0.0\fP\&.
.sp
To bind to all IPv4 and IPv6 addresses, enter \fB::,0.0.0.0\fP or
starting in MongoDB 4.2, an asterisk \fB"*"\fP (enclose the asterisk in
quotes to avoid filename pattern expansion). Alternatively, use the
\fBnet.bindIpAll\fP setting.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
.INDENT 0.0
.IP \(bu 2
\fB\-\-bind_ip\fP and \fB\-\-bind_ip_all\fP are mutually exclusive.
Specifying both options causes \fBmongos\fP to throw an error and
terminate.
.IP \(bu 2
The command\-line option \fB\-\-bind\fP overrides the configuration
file setting \fBnet.bindIp\fP\&.
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.INDENT 0.0
.TP
.B \-\-bind_ip_all
New in version 3.6.

.sp
If specified, the \fBmongos\fP instance binds to all IPv4
addresses (i.e. \fB0.0.0.0\fP). If \fBmongos\fP starts with
\fI\%\-\-ipv6\fP, \fI\%\-\-bind_ip_all\fP also binds to all IPv6 addresses
(i.e. \fB::\fP).
.sp
\fBmongos\fP only supports IPv6 if started with \fI\%\-\-ipv6\fP\&. Specifying
\fI\%\-\-bind_ip_all\fP alone does not enable IPv6 support.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
Before binding to a non\-localhost (e.g. publicly accessible)
IP address, ensure you have secured your cluster from unauthorized
access. For a complete list of security recommendations, see
/administration/security\-checklist\&. At minimum, consider
enabling authentication and
hardening network infrastructure\&.
.UNINDENT
.UNINDENT
.sp
For more information about IP Binding, refer to the
/core/security\-mongodb\-configuration documentation.
.sp
Alternatively, you can set the \fB\-\-bind_ip\fP option to \fB::,0.0.0.0\fP
or, starting in MongoDB 4.2, to an asterisk \fB"*"\fP (enclose the
asterisk in quotes to avoid filename pattern expansion).
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
\fB\-\-bind_ip\fP and \fB\-\-bind_ip_all\fP are mutually exclusive. That
is, you can specify one or the other, but not both.
.UNINDENT
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.UNINDENT
.INDENT 0.0
.TP
.B \-\-maxConns <number>
The maximum number of simultaneous connections that \fBmongos\fP will
accept. This setting has no effect if it is higher than your operating
system\(aqs configured maximum connection tracking threshold.
.sp
Do not assign too low of a value to this option, or you will
encounter errors during normal application operation.
.sp
This is particularly useful for a \fI\%mongos\fP if you have a client
that creates multiple connections and allows them to timeout rather
than closing them.
.sp
In this case, set \fBmaxIncomingConnections\fP to a value slightly
higher than the maximum number of connections that the client creates, or the
maximum size of the connection pool.
.sp
This setting prevents the \fI\%mongos\fP from causing connection spikes on
the individual shards\&. Spikes like these may disrupt the
operation and memory allocation of the sharded cluster\&.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Changed in version 2.6: MongoDB removed the upward limit on the \fBmaxIncomingConnections\fP
setting.

.UNINDENT
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.INDENT 0.0
.TP
.B \-\-syslog
Sends all logging output to the host\(aqs syslog system rather
than to standard output or to a log file (\fI\%\-\-logpath\fP).
.sp
The \fI\%\-\-syslog\fP option is not supported on Windows.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
The \fBsyslog\fP daemon generates timestamps when it logs a message, not
when MongoDB issues the message. This can lead to misleading timestamps
for log entries, especially when the system is under heavy load. We
recommend using the \fI\%\-\-logpath\fP option for production systems to
ensure accurate timestamps.
.UNINDENT
.UNINDENT
.sp
Starting in version 4.2, MongoDB includes the component in its log messages to \fBsyslog\fP\&.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
\&...  ACCESS   [repl writer worker 5] Unsupported modification to roles collection ...
.ft P
.fi
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.TP
.B \-\-syslogFacility <string>
\fIDefault\fP: user
.sp
Specifies the facility level used when logging messages to syslog.
The value you specify must be supported by your
operating system\(aqs implementation of syslog. To use this option, you
must  enable the \fI\%\-\-syslog\fP option.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-logpath <path>
Sends all diagnostic logging information to a log file instead of to
standard output or to the host\(aqs syslog system. MongoDB creates
the log file at the path you specify.
.sp
By default, MongoDB will move any existing log file rather than overwrite
it. To instead append to the log file, set the \fI\%\-\-logappend\fP option.
.UNINDENT
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.B \-\-logappend
Appends new entries to the end of the existing log file when the \fBmongos\fP
instance restarts. Without this option, \fBmongod\fP will back up the
existing log and create a new file.
.UNINDENT
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.TP
.B \-\-redactClientLogData
New in version 3.4: Available in MongoDB Enterprise only.

.sp
A \fBmongos\fP running with \fI\%\-\-redactClientLogData\fP redacts any message accompanying a given
log event before logging. This prevents the \fBmongos\fP from writing
potentially sensitive data stored on the database to the diagnostic log.
Metadata such as error or operation codes, line numbers, and source file
names are still visible in the logs.
.sp
Use \fI\%\-\-redactClientLogData\fP in conjunction with
/core/security\-encryption\-at\-rest and
/core/security\-transport\-encryption to assist compliance with
regulatory requirements.
.sp
For example, a MongoDB deployment might store Personally Identifiable
Information (PII) in one or more collections. The \fBmongos\fP logs events
such as those related to CRUD operations, sharding metadata, etc. It is
possible that the \fBmongos\fP may expose PII as a part of these logging
operations. A \fBmongos\fP running with \fI\%\-\-redactClientLogData\fP removes any message
accompanying these events before being output to the log, effectively
removing the PII.
.sp
Diagnostics on a \fBmongos\fP running with \fI\%\-\-redactClientLogData\fP may be more difficult
due to the lack of data related to a log event. See the
process logging manual page for an
example of the effect of \fI\%\-\-redactClientLogData\fP on log output.
.sp
You can enable or disable log redaction on a running \fBmongos\fP
using the \fBsetParameter\fP database command.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
db.adminCommand(
  { setParameter: 1, redactClientLogData : true | false }
)
.ft P
.fi
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.TP
.B \-\-timeStampFormat <string>
\fIDefault\fP: iso8601\-local
.sp
The time format for timestamps in log messages. Specify one of the
following values:
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
\fBctime\fP
T}	T{
Displays timestamps as \fBWed Dec 31
18:17:54.811\fP\&.
T}
_
T{
\fBiso8601\-utc\fP
T}	T{
Displays timestamps in Coordinated Universal Time (UTC) in the
ISO\-8601 format. For example, for New York at the start of the
Epoch: \fB1970\-01\-01T00:00:00.000Z\fP
T}
_
T{
\fBiso8601\-local\fP
T}	T{
Displays timestamps in local time in the ISO\-8601
format. For example, for New York at the start of the Epoch:
\fB1969\-12\-31T19:00:00.000\-0500\fP
T}
_
.TE
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.TP
.B \-\-pidfilepath <path>
Specifies a file location to hold the process ID of the \fBmongos\fP
process where \fBmongos\fP will write its PID. This is useful for
tracking the \fBmongos\fP process in combination with
the \fI\%\-\-fork\fP option. Without a specified \fI\%\-\-pidfilepath\fP option, the
process creates no PID file.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-keyFile <file>
Specifies the path to a key file that stores the shared secret
that MongoDB instances use to authenticate to each other in a
sharded cluster or replica set\&. \fI\%\-\-keyFile\fP implies
\fBclient authorization\fP\&. See inter\-process\-auth for more
information.
.sp
Starting in MongoDB 4.2, keyfiles for internal membership
authentication use YAML format to allow for
multiple keys in a keyfile. The YAML format accepts content of:
.INDENT 7.0
.IP \(bu 2
a single key string (same as in earlier versions),
.IP \(bu 2
multiple key strings (each string must be enclosed in quotes), or
.IP \(bu 2
sequence of key strings.
.UNINDENT
.sp
The YAML format is compatible with the existing single\-key
keyfiles that use the text file format.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-setParameter <options>
Specifies one of the MongoDB parameters described in
/reference/parameters\&. You can specify multiple \fBsetParameter\fP
fields.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-nounixsocket
Disables listening on the UNIX domain socket. \fI\%\-\-nounixsocket\fP applies only
to Unix\-based systems.
.sp
The \fBmongos\fP process
always listens on the UNIX socket unless one of the following is true:
.INDENT 7.0
.IP \(bu 2
\fI\%\-\-nounixsocket\fP is set
.IP \(bu 2
\fBnet.bindIp\fP is not set
.IP \(bu 2
\fBnet.bindIp\fP does not specify \fBlocalhost\fP or its associated IP address
.UNINDENT
.sp
New in version 2.6: \fBmongos\fP installed from official \&.deb and \&.rpm packages
have the \fBbind_ip\fP configuration set to \fB127.0.0.1\fP by
default.

.UNINDENT
.INDENT 0.0
.TP
.B \-\-unixSocketPrefix <path>
\fIDefault\fP: /tmp
.sp
The path for the UNIX socket. \fI\%\-\-unixSocketPrefix\fP applies only
to Unix\-based systems.
.sp
If this option has no value, the
\fBmongos\fP process creates a socket with \fB/tmp\fP as a prefix. MongoDB
creates and listens on a UNIX socket unless one of the following is true:
.INDENT 7.0
.IP \(bu 2
\fBnet.unixDomainSocket.enabled\fP is \fBfalse\fP
.IP \(bu 2
\fI\%\-\-nounixsocket\fP is set
.IP \(bu 2
\fBnet.bindIp\fP is not set
.IP \(bu 2
\fBnet.bindIp\fP does not specify \fBlocalhost\fP or its associated IP address
.UNINDENT
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.TP
.B \-\-filePermissions <path>
\fIDefault\fP: \fB0700\fP
.sp
Sets the permission for the UNIX domain socket file.
.sp
\fI\%\-\-filePermissions\fP applies only to Unix\-based systems.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-fork
Enables a daemon mode that runs the \fBmongos\fP process in the
background. By default \fBmongos\fP does not run as a daemon:
typically you will run \fBmongos\fP as a daemon, either by using
\fI\%\-\-fork\fP or by using a controlling process that handles the
daemonization process (e.g. as with \fBupstart\fP and \fBsystemd\fP).
.UNINDENT
.INDENT 0.0
.TP
.B \-\-transitionToAuth
New in version 3.4: Allows the \fBmongos\fP to accept and create authenticated and
non\-authenticated connections to and from other \fBmongod\fP
and \fI\%mongos\fP instances in the deployment. Used for
performing rolling transition of replica sets or sharded clusters
from a no\-auth configuration to internal authentication\&. Requires specifying a internal
authentication mechanism such as
\fI\%\-\-keyFile\fP\&.

.sp
For example, if using keyfiles for
internal authentication, the \fBmongos\fP creates
an authenticated connection with any \fBmongod\fP or \fI\%mongos\fP
in the deployment using a matching keyfile. If the security mechanisms do
not match, the \fBmongos\fP utilizes a non\-authenticated connection instead.
.sp
A \fBmongos\fP running with \fI\%\-\-transitionToAuth\fP does not enforce user access
controls\&. Users may connect to your deployment without any
access control checks and perform read, write, and administrative operations.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
A \fBmongos\fP running with internal authentication and \fIwithout\fP \fI\%\-\-transitionToAuth\fP requires clients to connect
using user access controls\&. Update clients to
connect to the \fBmongos\fP using the appropriate user
prior to restarting \fBmongos\fP without \fI\%\-\-transitionToAuth\fP\&.
.UNINDENT
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.TP
.B \-\-networkMessageCompressors <string>
\fIDefault\fP: snappy,zstd,zlib
.sp
New in version 3.4.

.sp
Specifies the default compressor(s) to use for
communication between this \fBmongos\fP instance and:
.INDENT 7.0
.IP \(bu 2
other members of the sharded cluster
.IP \(bu 2
a \fBmongo\fP shell
.IP \(bu 2
drivers that support the \fBOP_COMPRESSED\fP message format.
.UNINDENT
.sp
MongoDB supports the following compressors:
.INDENT 7.0
.IP \(bu 2
snappy
.IP \(bu 2
zlib (Available starting in MongoDB 3.6)
.IP \(bu 2
zstd (Available  starting in MongoDB 4.2)
.UNINDENT
.sp
\fBIn versions 3.6 and 4.0\fP, \fBmongod\fP and
\fI\%mongos\fP enable network compression by default with
\fBsnappy\fP as the compressor.
.sp
\fBStarting in version 4.2\fP, \fBmongod\fP and
\fI\%mongos\fP instances default to both \fBsnappy,zstd,zlib\fP
compressors, in that order.
.sp
To disable network compression, set the value to \fBdisabled\fP\&.
.sp
\fBIMPORTANT:\fP
.INDENT 7.0
.INDENT 3.5
Messages are compressed when both parties enable network
compression. Otherwise, messages between the parties are
uncompressed.
.UNINDENT
.UNINDENT
.sp
If you specify multiple compressors, then the order in which you list
the compressors matter as well as the communication initiator. For
example, if a \fBmongo\fP shell specifies the following network
compressors \fBzlib,snappy\fP and the \fBmongod\fP specifies
\fBsnappy,zlib\fP, messages between \fBmongo\fP shell and
\fBmongod\fP uses \fBzlib\fP\&.
.sp
If the parties do not share at least one common compressor, messages
between the parties are uncompressed. For example, if a
\fBmongo\fP shell specifies the network compressor
\fBzlib\fP and \fBmongod\fP specifies \fBsnappy\fP, messages
between \fBmongo\fP shell and \fBmongod\fP are not compressed.
.UNINDENT
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.TP
.B \-\-serviceExecutor <string>
\fIDefault\fP: synchronous
.sp
New in version 3.6.

.sp
Determines the threading and execution model \fBmongos\fP uses to
execute client requests. The \fB\-\-serviceExecutor\fP option accepts one
of the following values:
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
\fBsynchronous\fP
T}	T{
The \fBmongos\fP uses synchronous networking and manages its
networking thread pool on a per connection basis. Previous
versions of MongoDB managed threads in this way.
T}
_
T{
\fBadaptive\fP
T}	T{
The \fBmongos\fP uses the new experimental asynchronous
networking mode with an adaptive thread pool which manages
threads on a per request basis. This mode should have more
consistent performance and use less resources when there are
more inactive connections than database requests.
T}
_
.TE
.UNINDENT
.INDENT 0.0
.TP
.B \-\-timeZoneInfo <path>
The full path from which to load the time zone database. If this option
is not provided, then MongoDB will use its built\-in time zone database.
.sp
The configuration file included with Linux and macOS packages sets the time
zone database path to \fB/usr/share/zoneinfo\fP by default.
.sp
The built\-in time zone database is a copy of the \fI\%Olson/IANA time zone
database\fP\&. It is updated along with MongoDB
releases, but the release cycle of the time zone database differs from the
release cycle of MongoDB. A copy of the most recent release of the time zone
database can be downloaded from
\fI\%https://downloads.mongodb.org/olson_tz_db/timezonedb\-latest.zip\fP\&.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
wget https://downloads.mongodb.org/olson_tz_db/timezonedb\-latest.zip
unzip timezonedb\-latest.zip
mongos \-\-timeZoneInfo timezonedb\-2017b/
.ft P
.fi
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-outputConfig
New in version 4.2.

.sp
Outputs the \fBmongos\fP instance\(aqs configuration options, formatted
in YAML, to \fBstdout\fP and exits the \fBmongos\fP instance. For
configuration options that uses externally\-sourced\-values,
\fI\%\-\-outputConfig\fP returns the resolved value for those options.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
This may include any configured passwords or secrets previously
obfuscated through the external source.
.UNINDENT
.UNINDENT
.sp
For usage examples, see:
.INDENT 7.0
.IP \(bu 2
expansion\-directive\-output
.IP \(bu 2
/tutorial/convert\-command\-line\-options\-to\-yaml
.UNINDENT
.UNINDENT
.SS Sharded Cluster Options
.INDENT 0.0
.TP
.B \-\-configdb <replicasetName>/<config1>,<config2>...
Changed in version 3.2.

.sp
Specifies the configuration servers for the
sharded cluster\&.
.sp
Starting in MongoDB 3.2, config servers for sharded clusters can be
deployed as a replica set\&. The
replica set config servers must run the WiredTiger storage engine\&. MongoDB 3.2 deprecates the use of three mirrored
\fBmongod\fP instances for config servers.
.sp
Specify the config server replica set name and the hostname and port of
at least one of the members of the config server replica set.
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
sharding:
  configDB: <configReplSetName>/cfg1.example.net:27019, cfg2.example.net:27019,...
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The \fI\%mongos\fP instances for the sharded cluster must specify
the same config server replica set name but can specify hostname and
port of different members of the replica set.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-localThreshold
\fIDefault\fP: 15
.sp
Specifies the ping time, in milliseconds, that \fI\%mongos\fP uses
to determine which secondary replica set members to pass read
operations from clients. The default value of \fB15\fP corresponds to
the default value in all of the client \fI\%drivers\fP\&.
.sp
When \fI\%mongos\fP receives a request that permits reads to
secondary members, the \fI\%mongos\fP will:
.INDENT 7.0
.IP \(bu 2
Find the member of the set with the lowest ping time.
.IP \(bu 2
Construct a list of replica set members that is within a ping time of
15 milliseconds of the nearest suitable member of the set.
.sp
If you specify a value for the \fI\%\-\-localThreshold\fP option, \fI\%mongos\fP will
construct the list of replica members that are within the latency
allowed by this value.
.IP \(bu 2
Select a member to read from at random from this list.
.UNINDENT
.sp
The ping time used for a member compared by the \fI\%\-\-localThreshold\fP setting is a
moving average of recent ping times, calculated at most every 10
seconds. As a result, some queries may reach members above the threshold
until the \fI\%mongos\fP recalculates the average.
.sp
See the replica\-set\-read\-preference\-behavior\-member\-selection
section of the read preference
documentation for more information.
.UNINDENT
.SS TLS Options
.INDENT 0.0
.INDENT 3.5
.SS See
.sp
/tutorial/configure\-ssl for full
documentation of MongoDB\(aqs support.
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsMode <mode>
New in version 4.2.

.sp
Enables TLS used for all network connections. The
argument to the \fI\%\-\-tlsMode\fP option can be one of the following:
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
\fBdisabled\fP
T}	T{
The server does not use TLS.
T}
_
T{
\fBallowTLS\fP
T}	T{
Connections between servers do not use TLS. For incoming
connections, the server accepts both TLS and non\-TLS.
T}
_
T{
\fBpreferTLS\fP
T}	T{
Connections between servers use TLS. For incoming
connections, the server accepts both TLS and non\-TLS.
T}
_
T{
\fBrequireTLS\fP
T}	T{
The server uses and accepts only TLS encrypted connections.
T}
_
.TE
.sp
If \fB\-\-tlsCAFile\fP or \fBtls.CAFile\fP is not
specified and you are not using x.509 authentication, the
system\-wide CA certificate store will be used when connecting to an
TLS\-enabled server.
.sp
If using x.509 authentication, \fB\-\-tlsCAFile\fP or \fBtls.CAFile\fP
must be specified unless using \fB\-\-tlsCertificateSelector\fP\&.
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsCertificateKeyFile <filename>
New in version 4.2.

.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Starting in 4.0, on macOS or Windows, you can use a certificate from
the operating system\(aqs secure store instead of specifying a PEM file. See
\fI\%\-\-tlsCertificateSelector\fP\&.
.UNINDENT
.UNINDENT
.sp
Specifies the \fB\&.pem\fP file that contains both the TLS certificate
and key.
.INDENT 7.0
.IP \(bu 2
On Linux/BSD, you must specify \fI\%\-\-tlsCertificateKeyFile\fP when TLS is enabled.
.IP \(bu 2
On Windows or macOS, you must specify either \fI\%\-\-tlsCertificateKeyFile\fP or
\fI\%\-\-tlsCertificateSelector\fP when TLS is enabled.
.UNINDENT
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsCertificateKeyFilePassword <value>
New in version 4.2.

.sp
Specifies the password to de\-crypt the certificate\-key file (i.e.
\fI\%\-\-tlsCertificateKeyFile\fP). Use the \fI\%\-\-tlsCertificateKeyFilePassword\fP option only if the
certificate\-key file is encrypted. In all cases, the \fBmongos\fP will
redact the password from all logging and reporting output.
.sp
Starting in MongoDB 4.0:
.INDENT 7.0
.IP \(bu 2
On Linux/BSD, if the private key in the PEM file is encrypted and
you do not specify the \fI\%\-\-tlsCertificateKeyFilePassword\fP option, MongoDB will prompt for a
passphrase. See ssl\-certificate\-password\&.
.IP \(bu 2
On macOS or Windows, if the private key in the PEM file is
encrypted, you must explicitly specify the \fI\%\-\-tlsCertificateKeyFilePassword\fP option.
Alternatively, you can use a certificate from the secure system
store (see \fI\%\-\-tlsCertificateSelector\fP) instead of a PEM file or use an
unencrypted PEM file.
.UNINDENT
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-clusterAuthMode <option>
\fIDefault\fP: keyFile
.sp
New in version 2.6.

.sp
The authentication mode used for cluster authentication. If you use
internal x.509 authentication,
specify so here. This option can have one of the following values:
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
\fBkeyFile\fP
T}	T{
Use a keyfile for authentication.
Accept only keyfiles.
T}
_
T{
\fBsendKeyFile\fP
T}	T{
For rolling upgrade purposes. Send a keyfile for
authentication but can accept both keyfiles and x.509
certificates.
T}
_
T{
\fBsendX509\fP
T}	T{
For rolling upgrade purposes. Send the x.509 certificate for
authentication but can accept both keyfiles and x.509
certificates.
T}
_
T{
\fBx509\fP
T}	T{
Recommended. Send the x.509 certificate for authentication and
accept only x.509 certificates.
T}
_
.TE
.sp
If \fB\-\-tlsCAFile\fP or \fBtls.CAFile\fP is not
specified and you are not using x.509 authentication, the
system\-wide CA certificate store will be used when connecting to an
TLS\-enabled server.
.sp
If using x.509 authentication, \fB\-\-tlsCAFile\fP or \fBtls.CAFile\fP
must be specified unless using \fB\-\-tlsCertificateSelector\fP\&.
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsClusterFile <filename>
New in version 4.2.

.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Starting in 4.0, on macOS or Windows, you can use a certificate
from the operating system\(aqs secure store instead of a PEM
file. See \fI\%\-\-tlsClusterCertificateSelector\fP\&.
.UNINDENT
.UNINDENT
.sp
Specifies the \fB\&.pem\fP file that contains the x.509 certificate\-key
file for membership authentication
for the cluster or replica set.
.sp
If \fI\%\-\-tlsClusterFile\fP does not specify the \fB\&.pem\fP file for internal cluster
authentication or the alternative
\fI\%\-\-tlsClusterCertificateSelector\fP, the cluster uses the
\fB\&.pem\fP file specified in the \fI\%\-\-tlsCertificateKeyFile\fP option or
the certificate returned by the \fI\%\-\-tlsCertificateSelector\fP\&.
.sp
If using x.509 authentication, \fB\-\-tlsCAFile\fP or \fBtls.CAFile\fP
must be specified unless using \fB\-\-tlsCertificateSelector\fP\&.
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsClusterPassword <value>
New in version 4.2.

.sp
Specifies the password to de\-crypt the x.509 certificate\-key file
specified with \fB\-\-tlsClusterFile\fP\&. Use the \fI\%\-\-tlsClusterPassword\fP option only
if the certificate\-key file is encrypted. In all cases, the \fBmongos\fP
will redact the password from all logging and reporting output.
.sp
Starting in MongoDB 4.0:
.INDENT 7.0
.IP \(bu 2
On Linux/BSD, if the private key in the x.509 file is encrypted and
you do not specify the \fI\%\-\-tlsClusterPassword\fP option, MongoDB will prompt for a
passphrase. See ssl\-certificate\-password\&.
.IP \(bu 2
On macOS or Windows, if the private key in the x.509 file is
encrypted, you must explicitly specify the \fI\%\-\-tlsClusterPassword\fP option.
Alternatively, you can either use a certificate from the secure
system store (see \fI\%\-\-tlsClusterCertificateSelector\fP) instead of a cluster PEM file or
use an unencrypted PEM file.
.UNINDENT
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsCAFile <filename>
New in version 4.2.

.sp
Specifies the \fB\&.pem\fP file that contains the root certificate chain
from the Certificate Authority. Specify the file name of the
\fB\&.pem\fP file using relative or absolute paths.
.sp
Starting in 4.0, on macOS or Windows, you can use a certificate from
the operating system\(aqs secure store instead of a PEM key file. See
\fI\%\-\-tlsCertificateSelector\fP\&. When using the secure store, you
do not need to, but can, also specify the \fI\%\-\-tlsCAFile\fP\&.
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsClusterCAFile <filename>
New in version 4.2.

.sp
Specifies the \fB\&.pem\fP file that contains the root certificate chain
from the Certificate Authority used to validate the certificate
presented by a client establishing a connection. Specify the file
name of the \fB\&.pem\fP file using relative or absolute paths.
.sp
If \fI\%\-\-tlsClusterCAFile\fP does not specify the \fB\&.pem\fP file for validating the
certificate from a client establishing a connection, the cluster uses
the \fB\&.pem\fP file specified in the \fI\%\-\-tlsCAFile\fP option.
.sp
\fI\%\-\-tlsClusterCAFile\fP lets you use separate Certificate Authorities to verify the
client to server and server to client portions of the TLS handshake.
.sp
Starting in 4.0, on macOS or Windows, you can use a certificate from
the operating system\(aqs secure store instead of a PEM key file. See
\fI\%\-\-tlsClusterCertificateSelector\fP\&. When using the secure store, you
do not need to, but can, also specify the \fI\%\-\-tlsClusterCAFile\fP\&.
.sp
Requires that \fI\%\-\-tlsCAFile\fP is set.
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsCertificateSelector <parameter>=<value>
New in version 4.2: Available on Windows and macOS as an alternative to \fI\%\-\-tlsCertificateKeyFile\fP\&.
.sp
The \fI\%\-\-tlsCertificateKeyFile\fP and \fI\%\-\-tlsCertificateSelector\fP options are mutually exclusive. You can only
specify one.

.sp
Specifies a certificate property in order to select a matching
certificate from the operating system\(aqs certificate store.
.sp
\fI\%\-\-tlsCertificateSelector\fP accepts an argument of the format \fB<property>=<value>\fP
where the property can be one of the following:
.TS
center;
|l|l|l|.
_
T{
Property
T}	T{
Value type
T}	T{
Description
T}
_
T{
\fBsubject\fP
T}	T{
ASCII string
T}	T{
Subject name or common name on certificate
T}
_
T{
\fBthumbprint\fP
T}	T{
hex string
T}	T{
A sequence of bytes, expressed as hexadecimal, used to
identify a public key by its SHA\-1 digest.
.sp
The \fBthumbprint\fP is sometimes referred to as a
\fBfingerprint\fP\&.
T}
_
.TE
.sp
When using the system SSL certificate store, OCSP (Online
Certificate Status Protocol) is used to validate the revocation
status of certificates.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsClusterCertificateSelector <parameter>=<value>
New in version 4.2: Available on Windows and macOS as an alternative to
\fI\%\-\-tlsClusterFile\fP\&.
.sp
\fI\%\-\-tlsClusterFile\fP and \fI\%\-\-tlsClusterCertificateSelector\fP options are mutually exclusive. You can only
specify one.

.sp
Specifies a certificate property in order to select a matching
certificate from the operating system\(aqs certificate store to use for
internal authentication.
.sp
\fI\%\-\-tlsClusterCertificateSelector\fP accepts an argument of the format \fB<property>=<value>\fP
where the property can be one of the following:
.TS
center;
|l|l|l|.
_
T{
Property
T}	T{
Value type
T}	T{
Description
T}
_
T{
\fBsubject\fP
T}	T{
ASCII string
T}	T{
Subject name or common name on certificate
T}
_
T{
\fBthumbprint\fP
T}	T{
hex string
T}	T{
A sequence of bytes, expressed as hexadecimal, used to
identify a public key by its SHA\-1 digest.
.sp
The \fBthumbprint\fP is sometimes referred to as a
\fBfingerprint\fP\&.
T}
_
.TE
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsCRLFile <filename>
New in version 4.2.

.sp
Specifies the the \fB\&.pem\fP file that contains the Certificate Revocation
List. Specify the file name of the \fB\&.pem\fP file using relative or
absolute paths.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Starting in MongoDB 4.0, you cannot specify \fI\%\-\-tlsCRLFile\fP on macOS.  Use \fI\%\-\-tlsCertificateSelector\fP instead.
.UNINDENT
.UNINDENT
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsAllowConnectionsWithoutCertificates
New in version 4.2.

.sp
For clients that do not present certificates, \fBmongos\fP bypasses
TLS/SSL certificate validation when establishing the connection.
.sp
For clients that present a certificate, however, \fBmongos\fP performs
certificate validation using the root certificate chain specified by
\fB\-\-tlsCAFile\fP and reject clients with invalid certificates.
.sp
Use the \fI\%\-\-tlsAllowConnectionsWithoutCertificates\fP option if you have a mixed deployment that includes
clients that do not or cannot present certificates to the \fBmongos\fP\&.
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsAllowInvalidCertificates
New in version 4.2.

.sp
Bypasses the validation checks for TLS certificates on other
servers in the cluster and allows the use of invalid certificates to
connect.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
If you specify
\fB\-\-tlsAllowInvalidCertificates\fP or \fBtls.allowInvalidCertificates:
true\fP when using x.509 authentication, an invalid certificate is
only sufficient to establish a TLS connection but is
\fIinsufficient\fP for authentication.
.UNINDENT
.UNINDENT
.sp
When using
the \fI\%\-\-tlsAllowInvalidCertificates\fP setting, MongoDB
logs a warning regarding the use of the invalid certificate.
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsAllowInvalidHostnames
New in version 4.2.

.sp
Disables the validation of the hostnames in TLS certificates,
when connecting to other members of the replica set or sharded cluster
for inter\-process authentication. This allows \fBmongos\fP to connect
to other members if the hostnames in their certificates do not match
their configured hostname.
.sp
For more information about TLS and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsDisabledProtocols <protocol(s)>
New in version 4.2.

.sp
Prevents a MongoDB server running with TLS from accepting
incoming connections that use a specific protocol or protocols. To
specify multiple protocols, use a comma separated list of protocols.
.sp
\fI\%\-\-tlsDisabledProtocols\fP recognizes the following protocols: \fBTLS1_0\fP, \fBTLS1_1\fP,
\fBTLS1_2\fP, and starting in version 4.0.4 (and 3.6.9), \fBTLS1_3\fP\&.
.INDENT 7.0
.IP \(bu 2
On macOS, you cannot disable \fBTLS1_1\fP and leave both \fBTLS1_0\fP and
\fBTLS1_2\fP enabled. You must disable at least one of the other
two, for example, \fBTLS1_0,TLS1_1\fP\&.
.IP \(bu 2
To list multiple protocols, specify as a comma separated list of
protocols. For example \fBTLS1_0,TLS1_1\fP\&.
.IP \(bu 2
Specifying an unrecognized protocol will prevent the server from
starting.
.IP \(bu 2
The specified disabled protocols overrides any default disabled
protocols.
.UNINDENT
.sp
Starting in version 4.0, MongoDB disables the use of TLS 1.0 if TLS
1.1+ is available on the system. To enable the disabled TLS 1.0,
specify \fBnone\fP to \fI\%\-\-tlsDisabledProtocols\fP\&. See 4.0\-disable\-tls\&.
.sp
Members of replica sets and sharded clusters must speak at least one
protocol in common.
.sp
\fBSEE ALSO:\fP
.INDENT 7.0
.INDENT 3.5
ssl\-disallow\-protocols
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-tlsFIPSMode
New in version 4.2.

.sp
Directs the \fBmongos\fP to use the FIPS mode of the  TLS
library. Your system must have a FIPS
compliant library to use the \fI\%\-\-tlsFIPSMode\fP option.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
FIPS\-compatible TLS/SSL is
available only in \fI\%MongoDB Enterprise\fP\&. See
/tutorial/configure\-fips for more information.
.UNINDENT
.UNINDENT
.UNINDENT
.SS SSL Options (Deprecated)
.sp
\fBIMPORTANT:\fP
.INDENT 0.0
.INDENT 3.5
All SSL options are deprecated since 4.2. Use the TLS counterparts
instead, as they have identical functionality to the SSL options.  The SSL
protocol is deprecated and MongoDB supports TLS 1.0 and later.
.UNINDENT
.UNINDENT
.INDENT 0.0
.INDENT 3.5
.SS See
.sp
/tutorial/configure\-ssl for full
documentation of MongoDB\(aqs support.
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslOnNormalPorts
Deprecated since version 2.6: Use \fI\%\-\-tlsMode requireTLS\fP instead.

.sp
Enables TLS/SSL for \fBmongos\fP\&.
.sp
With \fI\%\-\-sslOnNormalPorts\fP, a \fBmongos\fP requires TLS/SSL encryption for all
connections on the default MongoDB port, or the port specified by
\fI\%\-\-port\fP\&. By default, \fI\%\-\-sslOnNormalPorts\fP is
disabled.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslMode <mode>
Deprecated since version 4.2: Use \fI\%\-\-tlsMode\fP instead.

.sp
New in version 2.6.

.sp
Enables TLS/SSL or mixed TLS/SSL used for all network connections. The
argument to the \fI\%\-\-sslMode\fP option can be one of the following:
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
\fBdisabled\fP
T}	T{
The server does not use TLS/SSL.
T}
_
T{
\fBallowSSL\fP
T}	T{
Connections between servers do not use TLS/SSL. For incoming
connections, the server accepts both TLS/SSL and non\-TLS/non\-SSL.
T}
_
T{
\fBpreferSSL\fP
T}	T{
Connections between servers use TLS/SSL. For incoming
connections, the server accepts both TLS/SSL and non\-TLS/non\-SSL.
T}
_
T{
\fBrequireSSL\fP
T}	T{
The server uses and accepts only TLS/SSL encrypted connections.
T}
_
.TE
.sp
Starting in version 3.4, if \fB\-\-tlsCAFile\fP/\fBnet.tls.CAFile\fP (or
their aliases \fB\-\-sslCAFile\fP/\fBnet.ssl.CAFile\fP) is not specified
and you are not using x.509 authentication, the system\-wide CA
certificate store will be used when connecting to an TLS/SSL\-enabled
server.
.sp
To use x.509 authentication, \fB\-\-tlsCAFile\fP or \fBnet.tls.CAFile\fP
must be specified unless using \fB\-\-tlsCertificateSelector\fP or
\fB\-\-net.tls.certificateSelector\fP\&. Or if using the \fBssl\fP aliases,
\fB\-\-sslCAFile\fP or \fBnet.ssl.CAFile\fP must be specified unless using
\fB\-\-sslCertificateSelector\fP or \fBnet.ssl.certificateSelector\fP\&.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslPEMKeyFile <filename>
Deprecated since version 4.2: Use \fI\%\-\-tlsPEMKeyFile\fP instead.

.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Starting in 4.0, on macOS or Windows, you can use a certificate from
the operating system\(aqs secure store instead of a PEM file. See
\fI\%\-\-sslCertificateSelector\fP\&.
.UNINDENT
.UNINDENT
.sp
Specifies the \fB\&.pem\fP file that contains both the TLS/SSL certificate
and key.
.INDENT 7.0
.IP \(bu 2
On Linux/BSD, you must specify \fI\%\-\-sslPEMKeyFile\fP when TLS/SSL is enabled.
.IP \(bu 2
On Windows or macOS, you must specify either \fI\%\-\-sslPEMKeyFile\fP or
\fI\%\-\-sslCertificateSelector\fP when TLS/SSL is enabled.
.UNINDENT
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslPEMKeyPassword <value>
Deprecated since version 4.2: Use \fI\%\-\-tlsPEMKeyPassword\fP instead.

.sp
Specifies the password to de\-crypt the certificate\-key file (i.e.
\fI\%\-\-sslPEMKeyFile\fP). Use the \fI\%\-\-sslPEMKeyPassword\fP option only if the
certificate\-key file is encrypted. In all cases, the \fBmongos\fP will
redact the password from all logging and reporting output.
.sp
Starting in MongoDB 4.0:
.INDENT 7.0
.IP \(bu 2
On Linux/BSD, if the private key in the PEM file is encrypted and
you do not specify the \fI\%\-\-sslPEMKeyPassword\fP option, MongoDB will prompt for a
passphrase. See ssl\-certificate\-password\&.
.IP \(bu 2
On macOS or Windows, if the private key in the PEM file is
encrypted, you must explicitly specify the \fI\%\-\-sslPEMKeyPassword\fP option.
Alternatively, you can use a certificate from the secure system
store (see \fI\%\-\-sslCertificateSelector\fP) instead of a PEM key file or use an
unencrypted PEM file.
.UNINDENT
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslClusterFile <filename>
Deprecated since version 4.2: Use \fI\%\-\-tlsClusterFile\fP instead.

.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Starting in 4.0, on macOS or Windows, you can use a certificate
from the operating system\(aqs secure store instead of a PEM key
file. See \fI\%\-\-sslClusterCertificateSelector\fP\&.
.UNINDENT
.UNINDENT
.sp
Specifies the \fB\&.pem\fP file that contains the x.509 certificate\-key
file for membership authentication
for the cluster or replica set.
.sp
If \fI\%\-\-sslClusterFile\fP does not specify the \fB\&.pem\fP file for internal cluster
authentication or the alternative
\fI\%\-\-sslClusterCertificateSelector\fP, the cluster uses the
\fB\&.pem\fP file specified in the \fI\%\-\-sslPEMKeyFile\fP option or
the certificate returned by the \fI\%\-\-sslCertificateSelector\fP\&.
.sp
To use x.509 authentication, \fB\-\-tlsCAFile\fP or \fBnet.tls.CAFile\fP
must be specified unless using \fB\-\-tlsCertificateSelector\fP or
\fB\-\-net.tls.certificateSelector\fP\&. Or if using the \fBssl\fP aliases,
\fB\-\-sslCAFile\fP or \fBnet.ssl.CAFile\fP must be specified unless using
\fB\-\-sslCertificateSelector\fP or \fBnet.ssl.certificateSelector\fP\&.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslClusterPassword <value>
Deprecated since version 4.2: Use \fI\%\-\-tlsClusterPassword\fP instead.

.sp
New in version 2.6.

.sp
Specifies the password to de\-crypt the x.509 certificate\-key file
specified with \fB\-\-sslClusterFile\fP\&. Use the \fI\%\-\-sslClusterPassword\fP option only
if the certificate\-key file is encrypted. In all cases, the \fBmongos\fP
will redact the password from all logging and reporting output.
.sp
Starting in MongoDB 4.0:
.INDENT 7.0
.IP \(bu 2
On Linux/BSD, if the private key in the x.509 file is encrypted and
you do not specify the \fI\%\-\-sslClusterPassword\fP option, MongoDB will prompt for a
passphrase. See ssl\-certificate\-password\&.
.IP \(bu 2
On macOS or Windows, if the private key in the x.509 file is
encrypted, you must explicitly specify the \fI\%\-\-sslClusterPassword\fP option.
Alternatively, you can either use a certificate from the secure
system store (see \fI\%\-\-sslClusterCertificateSelector\fP) instead of a cluster PEM file or
use an unencrypted PEM file.
.UNINDENT
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslCAFile <filename>
Deprecated since version 4.2: Use \fI\%\-\-tlsCAFile\fP instead.

.sp
Specifies the \fB\&.pem\fP file that contains the root certificate chain
from the Certificate Authority. Specify the file name of the
\fB\&.pem\fP file using relative or absolute paths.
.sp
Starting in 4.0, on macOS or Windows, you can use a certificate from
the operating system\(aqs secure store instead of a PEM key file. See
\fI\%\-\-sslCertificateSelector\fP\&. When using the secure store, you
do not need to, but can, also specify the \fI\%\-\-sslCAFile\fP\&.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslClusterCAFile <filename>
Deprecated since version 4.2: Use \fI\%\-\-tlsClusterCAFile\fP instead.

.sp
Specifies the \fB\&.pem\fP file that contains the root certificate chain
from the Certificate Authority used to validate the certificate
presented by a client establishing a connection. Specify the file
name of the \fB\&.pem\fP file using relative or absolute paths.
.sp
If \fI\%\-\-sslClusterCAFile\fP does not specify the \fB\&.pem\fP file for validating the
certificate from a client establishing a connection, the cluster uses
the \fB\&.pem\fP file specified in the \fI\%\-\-sslCAFile\fP option.
.sp
\fI\%\-\-sslClusterCAFile\fP lets you use separate Certificate Authorities to verify the
client to server and server to client portions of the TLS handshake.
.sp
Starting in 4.0, on macOS or Windows, you can use a certificate from
the operating system\(aqs secure store instead of a PEM key file. See
\fI\%\-\-sslClusterCertificateSelector\fP\&. When using the secure store, you
do not need to, but can, also specify the \fI\%\-\-sslClusterCAFile\fP\&.
.sp
Requires that \fI\%\-\-sslCAFile\fP is set.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslCertificateSelector <parameter>=<value>
Deprecated since version 4.2: Use \fI\%\-\-tlsCertificateSelector\fP instead.

.sp
New in version 4.0: Available on Windows and macOS as an alternative to \fI\%\-\-tlsCertificateKeyFile\fP\&.
.sp
\fI\%\-\-tlsCertificateKeyFile\fP and \fI\%\-\-sslCertificateSelector\fP options are mutually exclusive. You can only
specify one.

.sp
Specifies a certificate property in order to select a matching
certificate from the operating system\(aqs certificate store.
.sp
\fI\%\-\-sslCertificateSelector\fP accepts an argument of the format \fB<property>=<value>\fP
where the property can be one of the following:
.TS
center;
|l|l|l|.
_
T{
Property
T}	T{
Value type
T}	T{
Description
T}
_
T{
\fBsubject\fP
T}	T{
ASCII string
T}	T{
Subject name or common name on certificate
T}
_
T{
\fBthumbprint\fP
T}	T{
hex string
T}	T{
A sequence of bytes, expressed as hexadecimal, used to
identify a public key by its SHA\-1 digest.
.sp
The \fBthumbprint\fP is sometimes referred to as a
\fBfingerprint\fP\&.
T}
_
.TE
.sp
When using the system SSL certificate store, OCSP (Online
Certificate Status Protocol) is used to validate the revocation
status of certificates.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslClusterCertificateSelector <parameter>=<value>
Deprecated since version 4.2: Use \fI\%\-\-tlsClusterCertificateSelector\fP instead.

.sp
New in version 4.0: Available on Windows and macOS as an alternative to
\fI\%\-\-sslClusterFile\fP\&.
.sp
\fI\%\-\-sslClusterFile\fP and \fI\%\-\-sslClusterCertificateSelector\fP options are mutually exclusive. You can only
specify one.

.sp
Specifies a certificate property in order to select a matching
certificate from the operating system\(aqs certificate store to use for
internal authentication.
.sp
\fI\%\-\-sslClusterCertificateSelector\fP accepts an argument of the format \fB<property>=<value>\fP
where the property can be one of the following:
.TS
center;
|l|l|l|.
_
T{
Property
T}	T{
Value type
T}	T{
Description
T}
_
T{
\fBsubject\fP
T}	T{
ASCII string
T}	T{
Subject name or common name on certificate
T}
_
T{
\fBthumbprint\fP
T}	T{
hex string
T}	T{
A sequence of bytes, expressed as hexadecimal, used to
identify a public key by its SHA\-1 digest.
.sp
The \fBthumbprint\fP is sometimes referred to as a
\fBfingerprint\fP\&.
T}
_
.TE
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslCRLFile <filename>
Deprecated since version 4.2: Use \fI\%\-\-tlsCRLFile\fP instead.

.sp
Specifies the the \fB\&.pem\fP file that contains the Certificate Revocation
List. Specify the file name of the \fB\&.pem\fP file using relative or
absolute paths.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Starting in MongoDB 4.0, you cannot specify \fI\%\-\-sslCRLFile\fP on macOS.  Use \fI\%\-\-sslCertificateSelector\fP instead.
.UNINDENT
.UNINDENT
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslAllowConnectionsWithoutCertificates
Deprecated since version 4.2: Use \fI\%\-\-tlsAllowConnectionsWithoutCertificates\fP instead.

.sp
For clients that do not present certificates, \fBmongos\fP bypasses
TLS/SSL certificate validation when establishing the connection.
.sp
For clients that present a certificate, however, \fBmongos\fP performs
certificate validation using the root certificate chain specified by
\fB\-\-sslCAFile\fP and reject clients with invalid certificates.
.sp
Use the \fI\%\-\-sslAllowConnectionsWithoutCertificates\fP option if you have a mixed deployment that includes
clients that do not or cannot present certificates to the \fBmongos\fP\&.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslAllowInvalidCertificates
Deprecated since version 4.2: Use \fI\%\-\-tlsAllowInvalidCertificates\fP instead.

.sp
Bypasses the validation checks for TLS/SSL certificates on other
servers in the cluster and allows the use of invalid certificates to
connect.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Starting in MongoDB 4.0, if you specify
\fB\-\-sslAllowInvalidCertificates\fP or
\fBnet.ssl.allowInvalidCertificates: true\fP (or in MongoDB 4.2, the
alias \fB\-\-tlsAllowInvalidateCertificates\fP or
\fBnet.tls.allowInvalidCertificates: true\fP) when using x.509
authentication, an invalid certificate is only sufficient to
establish a TLS/SSL connection but is \fIinsufficient\fP for
authentication.
.UNINDENT
.UNINDENT
.sp
When using
the \fI\%\-\-sslAllowInvalidCertificates\fP setting, MongoDB
logs a warning regarding the use of the invalid certificate.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslAllowInvalidHostnames
Deprecated since version 4.2: Use \fI\%\-\-tlsAllowInvalidHostnames\fP instead.

.sp
New in version 3.0.

.sp
Disables the validation of the hostnames in TLS/SSL certificates,
when connecting to other members of the replica set or sharded cluster
for inter\-process authentication. This allows \fBmongos\fP to connect
to other members if the hostnames in their certificates do not match
their configured hostname.
.sp
For more information about TLS/SSL and MongoDB, see
/tutorial/configure\-ssl and
/tutorial/configure\-ssl\-clients .
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslDisabledProtocols <protocol(s)>
Deprecated since version 4.2: Use \fI\%\-\-tlsDisabledProtocols\fP instead.

.sp
New in version 3.0.7.

.sp
Prevents a MongoDB server running with TLS/SSL from accepting
incoming connections that use a specific protocol or protocols. To
specify multiple protocols, use a comma separated list of protocols.
.sp
\fI\%\-\-sslDisabledProtocols\fP recognizes the following protocols: \fBTLS1_0\fP, \fBTLS1_1\fP,
\fBTLS1_2\fP, and starting in version 4.0.4 (and 3.6.9), \fBTLS1_3\fP\&.
.INDENT 7.0
.IP \(bu 2
On macOS, you cannot disable \fBTLS1_1\fP and leave both \fBTLS1_0\fP and
\fBTLS1_2\fP enabled. You must disable at least one of the other
two, for example, \fBTLS1_0,TLS1_1\fP\&.
.IP \(bu 2
To list multiple protocols, specify as a comma separated list of
protocols. For example \fBTLS1_0,TLS1_1\fP\&.
.IP \(bu 2
Specifying an unrecognized protocol will prevent the server from
starting.
.IP \(bu 2
The specified disabled protocols overrides any default disabled
protocols.
.UNINDENT
.sp
Starting in version 4.0, MongoDB disables the use of TLS 1.0 if TLS
1.1+ is available on the system. To enable the disabled TLS 1.0,
specify \fBnone\fP to \fI\%\-\-sslDisabledProtocols\fP\&. See 4.0\-disable\-tls\&.
.sp
Members of replica sets and sharded clusters must speak at least one
protocol in common.
.sp
\fBSEE ALSO:\fP
.INDENT 7.0
.INDENT 3.5
ssl\-disallow\-protocols
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-sslFIPSMode
Deprecated since version 4.2: Use \fI\%\-\-tlsFIPSMode\fP instead.

.sp
Directs the \fBmongos\fP to use the FIPS mode of the  TLS/SSL
library. Your system must have a FIPS
compliant library to use the \fI\%\-\-sslFIPSMode\fP option.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
FIPS\-compatible TLS/SSL is
available only in \fI\%MongoDB Enterprise\fP\&. See
/tutorial/configure\-fips for more information.
.UNINDENT
.UNINDENT
.UNINDENT
.SS Audit Options
.INDENT 0.0
.TP
.B \-\-auditDestination
Enables auditing and specifies where
\fBmongos\fP sends all audit events.
.sp
\fI\%\-\-auditDestination\fP can have one of the following values:
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
\fBsyslog\fP
T}	T{
Output the audit events to syslog in JSON format. Not available on
Windows. Audit messages have a syslog severity level of \fBinfo\fP
and a facility level of \fBuser\fP\&.
.sp
The syslog message limit can result in the truncation of
audit messages. The auditing system will neither detect the
truncation nor error upon its occurrence.
T}
_
T{
\fBconsole\fP
T}	T{
Output the audit events to \fBstdout\fP in JSON format.
T}
_
T{
\fBfile\fP
T}	T{
Output the audit events to the file specified in
\fI\%\-\-auditPath\fP in the format specified in
\fI\%\-\-auditFormat\fP\&.
T}
_
.TE
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Available only in \fI\%MongoDB Enterprise\fP
and \fI\%MongoDB Atlas\fP\&.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-auditFormat
New in version 2.6.

.sp
Specifies the format of the output file for auditing if \fI\%\-\-auditDestination\fP is \fBfile\fP\&. The
\fI\%\-\-auditFormat\fP option can have one of the following values:
.TS
center;
|l|l|.
_
T{
Value
T}	T{
Description
T}
_
T{
\fBJSON\fP
T}	T{
Output the audit events in JSON format to the file specified
in \fI\%\-\-auditPath\fP\&.
T}
_
T{
\fBBSON\fP
T}	T{
Output the audit events in BSON binary format to the file
specified in \fI\%\-\-auditPath\fP\&.
T}
_
.TE
.sp
Printing audit events to a file in JSON format degrades server
performance more than printing to a file in BSON format.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Available only in \fI\%MongoDB Enterprise\fP
and \fI\%MongoDB Atlas\fP\&.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-auditPath
New in version 2.6.

.sp
Specifies the output file for auditing if
\fI\%\-\-auditDestination\fP has value of \fBfile\fP\&. The \fI\%\-\-auditPath\fP
option can take either a full path name or a relative path name.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Available only in \fI\%MongoDB Enterprise\fP
and \fI\%MongoDB Atlas\fP\&.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-auditFilter
New in version 2.6.

.sp
Specifies the filter to limit the types of operations the audit system records. The option takes a string representation
of a query document of the form:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
{ <field1>: <expression1>, ... }
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
The \fB<field>\fP can be any field in the audit message, including fields returned in the
param document. The
\fB<expression>\fP is a query condition expression\&.
.sp
To specify an audit filter, enclose the filter document in single
quotes to pass the document as a string.
.sp
To specify the audit filter in a configuration file, you must use the YAML format of
the configuration file.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Available only in \fI\%MongoDB Enterprise\fP
and \fI\%MongoDB Atlas\fP\&.
.UNINDENT
.UNINDENT
.UNINDENT
.SS Profiler Options
.sp
New in version 4.0.

.INDENT 0.0
.TP
.B \-\-slowms <integer>
\fIDefault\fP: 100
.sp
The \fIslow\fP operation time threshold, in milliseconds. Operations
that run for longer than this threshold are considered \fIslow\fP\&.
.sp
When \fBlogLevel\fP is set to \fB0\fP, MongoDB records \fIslow\fP
operations to the diagnostic log at a rate determined by
\fBslowOpSampleRate\fP\&.
.sp
At higher \fBlogLevel\fP settings, all operations appear
in the diagnostic log regardless of their latency.
.sp
For \fI\%mongos\fP instances,  affects the diagnostic
log only and not the profiler since profiling is not available on
\fI\%mongos\fP\&.
.sp
New in version 4.0.

.UNINDENT
.INDENT 0.0
.TP
.B \-\-slowOpSampleRate <double>
\fIDefault\fP: 1.0
.sp
The fraction of \fIslow\fP operations that should be logged.
\fI\%\-\-slowOpSampleRate\fP accepts values between 0 and 1, inclusive.
.sp
For \fI\%mongos\fP instances, \fI\%\-\-slowOpSampleRate\fP affects the diagnostic log
only and not the profiler since profiling is not available on
\fI\%mongos\fP\&.
.sp
New in version 4.0.

.UNINDENT
.SS LDAP Authentication and Authorization Options
.INDENT 0.0
.TP
.B \-\-ldapServers <host1>:<port>,<host2>:<port>,...,<hostN>:<port>
New in version 3.4: Available in MongoDB Enterprise only.

.sp
The LDAP server against which the \fBmongos\fP executes LDAP operations
against to authenticate users or determine what actions a user is authorized
to perform on a given database. If the LDAP server specified has any
replicated instances, you may specify the host and port of each replicated
server in a comma\-delimited list.
.sp
If your LDAP infrastrucure partitions the LDAP directory over multiple LDAP
servers, specify \fIone\fP LDAP server any of its replicated instances to
\fI\%\-\-ldapServers\fP\&. MongoDB supports following LDAP referrals as defined in \fI\%RFC 4511
4.1.10\fP\&. Do not use \fI\%\-\-ldapServers\fP
for listing every LDAP server in your infrastructure.
.sp
This setting can be configured on a running \fBmongos\fP using
\fBsetParameter\fP\&.
.sp
If unset, \fBmongos\fP cannot use LDAP authentication or authorization\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ldapQueryUser <string>
New in version 3.4: Available in MongoDB Enterprise only.

.sp
The identity with which \fBmongos\fP binds as, when connecting to or
performing queries on an LDAP server.
.sp
Only required if any of the following are true:
.INDENT 7.0
.IP \(bu 2
Using LDAP authorization\&.
.IP \(bu 2
Using an LDAP query for \fI\%username transformation\fP\&.
.IP \(bu 2
The LDAP server disallows anonymous binds
.UNINDENT
.sp
You must use \fI\%\-\-ldapQueryUser\fP with \fI\%\-\-ldapQueryPassword\fP\&.
.sp
If unset, \fBmongos\fP will not attempt to bind to the LDAP server.
.sp
This setting can be configured on a running \fBmongos\fP using
\fBsetParameter\fP\&.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Windows MongoDB deployments can use \fI\%\-\-ldapBindWithOSDefaults\fP
instead of \fI\%\-\-ldapQueryUser\fP and \fI\%\-\-ldapQueryPassword\fP\&. You cannot specify
both \fI\%\-\-ldapQueryUser\fP and \fI\%\-\-ldapBindWithOSDefaults\fP at the same time.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ldapQueryPassword <string>
New in version 3.4: Available in MongoDB Enterprise only.
.sp
The password used to bind to an LDAP server when using
\fI\%\-\-ldapQueryUser\fP\&. You must use \fI\%\-\-ldapQueryPassword\fP with
\fI\%\-\-ldapQueryUser\fP\&.

.sp
If unset, \fBmongos\fP will not attempt to bind to the LDAP server.
.sp
This setting can be configured on a running \fBmongos\fP using
\fBsetParameter\fP\&.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
Windows MongoDB deployments can use \fI\%\-\-ldapBindWithOSDefaults\fP
instead of \fI\%\-\-ldapQueryPassword\fP and \fI\%\-\-ldapQueryPassword\fP\&. You cannot specify
both \fI\%\-\-ldapQueryPassword\fP and \fI\%\-\-ldapBindWithOSDefaults\fP at the same time.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ldapBindWithOSDefaults <bool>
\fIDefault\fP: False
.sp
New in version 3.4: Available in MongoDB Enterprise for the Windows platform only.

.sp
Allows \fBmongos\fP to authenticate, or bind, using your Windows login
credentials when connecting to the LDAP server.
.sp
Only required if:
.INDENT 7.0
.IP \(bu 2
Using LDAP authorization\&.
.IP \(bu 2
Using an LDAP query for \fI\%username transformation\fP\&.
.IP \(bu 2
The LDAP server disallows anonymous binds
.UNINDENT
.sp
Use \fI\%\-\-ldapBindWithOSDefaults\fP to replace \fI\%\-\-ldapQueryUser\fP and
\fI\%\-\-ldapQueryPassword\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ldapBindMethod <string>
\fIDefault\fP: simple
.sp
New in version 3.4: Available in MongoDB Enterprise only.

.sp
The method \fBmongos\fP uses to authenticate to an LDAP server.
Use with \fI\%\-\-ldapQueryUser\fP and \fI\%\-\-ldapQueryPassword\fP to
connect to the LDAP server.
.sp
\fI\%\-\-ldapBindMethod\fP supports the following values:
.INDENT 7.0
.IP \(bu 2
\fBsimple\fP \- \fBmongos\fP uses simple authentication.
.IP \(bu 2
\fBsasl\fP \- \fBmongos\fP uses SASL protocol for authentication
.UNINDENT
.sp
If you specify \fBsasl\fP, you can configure the available SASL mechanisms
using \fI\%\-\-ldapBindSASLMechanisms\fP\&. \fBmongos\fP defaults to
using \fBDIGEST\-MD5\fP mechanism.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ldapBindSASLMechanisms <string>
\fIDefault\fP: DIGEST\-MD5
.sp
New in version 3.4: Available in MongoDB Enterprise only.

.sp
A comma\-separated list of SASL mechanisms \fBmongos\fP can
use when authenticating to the LDAP server. The \fBmongos\fP and the
LDAP server must agree on at least one mechanism. The \fBmongos\fP
dynamically loads any SASL mechanism libraries installed on the host
machine at runtime.
.sp
Install and configure the appropriate libraries for the selected
SASL mechanism(s) on both the \fBmongos\fP host and the remote
LDAP server host. Your operating system may include certain SASL
libraries by default. Defer to the documentation associated with each
SASL mechanism for guidance on installation and configuration.
.sp
If using the \fBGSSAPI\fP SASL mechanism for use with
security\-kerberos, verify the following for the
\fBmongos\fP host machine:
.INDENT 7.0
.TP
.B \fBLinux\fP
.INDENT 7.0
.IP \(bu 2
The \fBKRB5_CLIENT_KTNAME\fP environment
variable resolves to the name of the client keytab\-files
for the host machine. For more on Kerberos environment
variables, please defer to the
\fI\%Kerberos documentation\fP\&.
.IP \(bu 2
The client keytab includes a
kerberos\-user\-principal for the \fBmongos\fP to use when
connecting to the LDAP server and execute LDAP queries.
.UNINDENT
.TP
.B \fBWindows\fP
If connecting to an Active Directory server, the Windows
Kerberos configuration automatically generates a
\fI\%Ticket\-Granting\-Ticket\fP
when the user logs onto the system. Set \fI\%\-\-ldapBindWithOSDefaults\fP to
\fBtrue\fP to allow \fBmongos\fP to use the generated credentials when
connecting to the Active Directory server and execute queries.
.UNINDENT
.sp
Set \fI\%\-\-ldapBindMethod\fP to \fBsasl\fP to use this option.
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
For a complete list of SASL mechanisms see the
\fI\%IANA listing\fP\&.
Defer to the documentation for your LDAP or Active Directory
service for identifying the SASL mechanisms compatible with the
service.
.sp
MongoDB is not a source of SASL mechanism libraries, nor
is the MongoDB documentation a definitive source for
installing or configuring any given SASL mechanism. For
documentation and support, defer to the SASL mechanism
library vendor or owner.
.sp
For more information on SASL, defer to the following resources:
.INDENT 0.0
.IP \(bu 2
For Linux, please see the \fI\%Cyrus SASL documentation\fP\&.
.IP \(bu 2
For Windows, please see the \fI\%Windows SASL documentation\fP\&.
.UNINDENT
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ldapTransportSecurity <string>
\fIDefault\fP: tls
.sp
New in version 3.4: Available in MongoDB Enterprise only.

.sp
By default, \fBmongos\fP creates a TLS/SSL secured connection to the LDAP
server.
.sp
For Linux deployments, you must configure the appropriate TLS Options in
\fB/etc/openldap/ldap.conf\fP file. Your operating system\(aqs package manager
creates this file as part of the MongoDB Enterprise installation, via the
\fBlibldap\fP dependency. See the documentation for \fBTLS Options\fP in the
\fI\%ldap.conf OpenLDAP documentation\fP
for more complete instructions.
.sp
For Windows deployment, you must add the LDAP server CA certificates to the
Windows certificate management tool. The exact name and functionality of the
tool may vary depending on operating system version. Please see the
documentation for your version of Windows for more information on
certificate management.
.sp
Set \fI\%\-\-ldapTransportSecurity\fP to \fBnone\fP to disable TLS/SSL between \fBmongos\fP and the LDAP
server.
.sp
\fBWARNING:\fP
.INDENT 7.0
.INDENT 3.5
Setting \fI\%\-\-ldapTransportSecurity\fP to \fBnone\fP transmits plaintext information and possibly
credentials between \fBmongos\fP and the LDAP server.
.UNINDENT
.UNINDENT
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ldapTimeoutMS <long>
\fIDefault\fP: 10000
.sp
New in version 3.4: Available in MongoDB Enterprise only.

.sp
The amount of time in milliseconds \fBmongos\fP should wait for an LDAP server
to respond to a request.
.sp
Increasing the value of \fI\%\-\-ldapTimeoutMS\fP may prevent connection failure between the
MongoDB server and the LDAP server, if the source of the failure is a
connection timeout. Decreasing the value of \fI\%\-\-ldapTimeoutMS\fP reduces the time
MongoDB waits for a response from the LDAP server.
.sp
This setting can be configured on a running \fBmongos\fP using
\fBsetParameter\fP\&.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-ldapUserToDNMapping <string>
New in version 3.4: Available in MongoDB Enterprise only.

.sp
Maps the username provided to \fBmongos\fP for authentication to a LDAP
Distinguished Name (DN). You may need to use \fI\%\-\-ldapUserToDNMapping\fP to transform a
username into an LDAP DN in the following scenarios:
.INDENT 7.0
.IP \(bu 2
Performing LDAP authentication with simple LDAP binding, where users
authenticate to MongoDB with usernames that are not full LDAP DNs.
.IP \(bu 2
Using an \fBLDAP authorization query template\fP that requires a DN.
.IP \(bu 2
Transforming the usernames of clients authenticating to Mongo DB using
different authentication mechanisms (e.g. x.509, kerberos) to a full LDAP
DN for authorization.
.UNINDENT
.sp
\fI\%\-\-ldapUserToDNMapping\fP expects a quote\-enclosed JSON\-string representing an ordered array
of documents. Each document contains a regular expression \fBmatch\fP and
either a \fBsubstitution\fP or \fBldapQuery\fP template used for transforming the
incoming username.
.sp
Each document in the array has the following form:
.INDENT 7.0
.INDENT 3.5
.sp
.nf
.ft C
{
  match: "<regex>"
  substitution: "<LDAP DN>" | ldapQuery: "<LDAP Query>"
}
.ft P
.fi
.UNINDENT
.UNINDENT
.TS
center;
|l|l|l|.
_
T{
Field
T}	T{
Description
T}	T{
Example
T}
_
T{
\fBmatch\fP
T}	T{
An ECMAScript\-formatted regular expression (regex) to match against a
provided username. Each parenthesis\-enclosed section represents a
regex capture group used by \fBsubstitution\fP or \fBldapQuery\fP\&.
T}	T{
\fB"(.+)ENGINEERING"\fP
\fB"(.+)DBA"\fP
T}
_
T{
\fBsubstitution\fP
T}	T{
An LDAP distinguished name (DN) formatting template that converts the
authentication name matched by the \fBmatch\fP regex into a LDAP DN.
Each curly bracket\-enclosed numeric value is replaced by the
corresponding \fI\%regex capture group\fP extracted
from the authentication username via the \fBmatch\fP regex.
.sp
The result of the substitution must be an \fI\%RFC4514\fP escaped string.
T}	T{
\fB"cn={0},ou=engineering,
dc=example,dc=com"\fP
T}
_
T{
\fBldapQuery\fP
T}	T{
A LDAP query formatting template that inserts the authentication
name matched by the \fBmatch\fP regex into an LDAP query URI encoded
respecting RFC4515 and RFC4516. Each curly bracket\-enclosed numeric
value is replaced by the corresponding \fI\%regex capture group\fP extracted
from the authentication username via the \fBmatch\fP expression.
\fBmongos\fP executes the query against the LDAP server to retrieve
the LDAP DN for the authenticated user. \fBmongos\fP requires
exactly one returned result for the transformation to be
successful, or \fBmongos\fP skips this transformation.
T}	T{
\fB"ou=engineering,dc=example,
dc=com??one?(user={0})"\fP
T}
_
.TE
.sp
\fBNOTE:\fP
.INDENT 7.0
.INDENT 3.5
An explanation of  \fI\%RFC4514\fP,
\fI\%RFC4515\fP,
\fI\%RFC4516\fP, or LDAP queries is out
of scope for the MongoDB Documentation. Please review the RFC directly or
use your preferred LDAP resource.
.UNINDENT
.UNINDENT
.sp
For each document in the array, you must use either \fBsubstitution\fP or
\fBldapQuery\fP\&. You \fIcannot\fP specify both in the same document.
.sp
When performing authentication or authorization, \fBmongos\fP steps through
each document in the array in the given order, checking the authentication
username against the \fBmatch\fP filter.  If a match is found,
\fBmongos\fP applies the transformation and uses the output for
authenticating the user. \fBmongos\fP does not check the remaining documents
in the array.
.sp
If the given document does not match the provided authentication name, or
the transformation described by the document fails, \fBmongos\fP continues
through the list of documents to find additional matches. If no matches are
found in any document, \fBmongos\fP returns an error.
.INDENT 7.0
.INDENT 3.5
.SS Example
.sp
The following shows two transformation documents. The first
document matches against any string ending in \fB@ENGINEERING\fP, placing
anything preceeding the suffix into a regex capture group. The
second document matches against any string ending in \fB@DBA\fP, placing
anything preceeding the suffix into a regex capture group.
.sp
\fBIMPORTANT:\fP
.INDENT 0.0
.INDENT 3.5
You must pass the array to \fI\%\-\-ldapUserToDNMapping\fP as a string.
.UNINDENT
.UNINDENT
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
"[
   {
      match: "(.+)@ENGINEERING.EXAMPLE.COM",
      substitution: "cn={0},ou=engineering,dc=example,dc=com"
   },
   {
      match: "(.+)@DBA.EXAMPLE.COM",
      ldapQuery: "ou=dba,dc=example,dc=com??one?(user={0})"

   }

]"
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
A user with username \fBalice@ENGINEERING.EXAMPLE.COM\fP matches the first
document. The regex capture group \fB{0}\fP corresponds to the string
\fBalice\fP\&. The resulting output is the DN
\fB"cn=alice,ou=engineering,dc=example,dc=com"\fP\&.
.sp
A user with username \fBbob@DBA.EXAMPLE.COM\fP matches the second document.
The regex capture group \fB{0}\fP corresponds to the string \fBbob\fP\&.  The
resulting output is the LDAP query
\fB"ou=dba,dc=example,dc=com??one?(user=bob)"\fP\&. \fBmongos\fP executes this
query against the LDAP server, returning the result
\fB"cn=bob,ou=dba,dc=example,dc=com"\fP\&.
.UNINDENT
.UNINDENT
.sp
If \fI\%\-\-ldapUserToDNMapping\fP is unset, \fBmongos\fP applies no transformations to the username
when attempting to authenticate or authorize a user against the LDAP server.
.sp
This setting can be configured on a running \fBmongos\fP using the
\fBsetParameter\fP database command.
.UNINDENT
.SS Additional Options
.INDENT 0.0
.TP
.B \-\-ipv6
Enables IPv6 support. \fBmongos\fP disables IPv6 support by default.
.sp
Setting \fI\%\-\-ipv6\fP does \fInot\fP direct the \fBmongos\fP to listen on any
local IPv6 addresses or interfaces. To configure the \fBmongos\fP to
listen on an IPv6 interface, you must either:
.INDENT 7.0
.IP \(bu 2
Configure \fI\%\-\-bind_ip\fP with one or more IPv6 addresses or
hostnames that resolve to IPv6 addresses, \fBor\fP
.IP \(bu 2
Set \fI\%\-\-bind_ip_all\fP to \fBtrue\fP\&.
.UNINDENT
.UNINDENT
.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2008-2019
.\" Generated by docutils manpage writer.
.