.TH "MONGOOPLOG" "1" "March 14, 2013" "2.2.3" "mongodb-manual"
.SH NAME
mongooplog \- MongoDB
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.sp
New in version 2.2.
.SH SYNOPSIS
.sp
\fI\%mongooplog\fP is a simple tool that polls operations from
the \fIreplication\fP \fIoplog\fP of a remote server, and applies
them to the local server. This capability supports certain classes of
real\-time migrations that require that the source server remain online
and in operation throughout the migration process.
.sp
Typically this command will take the following form:
.sp
.nf
.ft C
mongooplog  \-\-from mongodb0.example.net \-\-host mongodb1.example.net
.ft P
.fi
.sp
This command copies oplog entries from the \fBmongod\fP instance
running on the host \fBmongodb0.example.net\fP and duplicates
operations to the host \fBmongodb1.example.net\fP. If you do not need
to keep the \fI\%--from\fP host running during
the migration, consider using \fBmongodump\fP and
\fBmongorestore\fP or another \fBbackup\fP operation, which may be better suited to
your operation.
.IP Note
If the \fBmongod\fP instance specified by the \fI\%--from\fP
argument is running with \fBauthentication\fP, then
\fI\%mongooplog\fP will not be able to copy oplog entries.
.RE
.IP "See also"
.sp
\fBmongodump\fP, \fBmongorestore\fP,
"\fB/administration/backups\fP", "\fIOplog Internals Overview\fP", and "\fIReplica Set Oplog Sizing\fP".
.RE
.SH OPTIONS
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.TP
.B mongooplog
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.B \-\-help
Returns a basic help and usage text.
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.B \-\-verbose, \-v
Increases the amount of internal reporting returned on the command
line. Increase the verbosity with the \fB\-v\fP form by including the
option multiple times, (e.g. \fB\-vvvvv\fP.)
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.B \-\-version
Returns the version of the \fI\%mongooplog\fP utility.
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.B \-\-host <hostname><:port>, \-h
Specifies a resolvable hostname for the \fBmongod\fP instance
to which \fI\%mongooplog\fP will apply \fIoplog\fP operations
retrieved from the serve specified by the \fI\%--from\fP
option.
.sp
\fI\%mongooplog\fP assumes that all target  \fBmongod\fP
instances are accessible by way of port \fB27017\fP. You may,
optionally, declare an alternate port number as part of the
hostname argument.
.sp
You can always connect directly to a single \fBmongod\fP
instance by specifying the host and port number directly.
.sp
To connect to a replica set, you can specify the replica set seed
name, and a seed list of set members, in the following format:
.sp
.nf
.ft C
<replica_set_name>/<hostname1><:port>,<hostname2:<port>,...
.ft P
.fi
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.TP
.B \-\-port
Specifies the port number of the \fBmongod\fP instance where
\fI\%mongooplog\fP will apply \fIoplog\fP entries. Only
specify this option if the MongoDB instance that you wish to
connect to is not running on the standard port. (i.e. \fB27017\fP)
You may also specify a port number using the \fI\%--host\fP command.
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.B \-\-ipv6
Enables IPv6 support that allows \fI\%mongooplog\fP to connect
to the MongoDB instance using an IPv6 network. All MongoDB programs
and processes, including \fI\%mongooplog\fP, disable IPv6
support by default.
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.B \-\-ssl
New in version 2.4: MongoDB added support for SSL connections to \fBmongod\fP
instances in mongooplog.
.IP Note
SSL support in mongooplog is not compiled into the default
distribution of MongoDB. See \fB/administration/ssl\fP for more
information on SSL and MongoDB.
.sp
Additionally, mongooplog does not support connections to
\fBmongod\fP instances that require client certificate
validation.
.RE
.sp
Allows \fI\%mongooplog\fP to connect to \fBmongod\fP
instance over an SSL connection.
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.B \-\-username <username>, \-u <username>
Specifies a username to authenticate to the MongoDB instance, if
your database requires authentication. Use in conjunction with the
\fI\%--password\fP option to supply a
password.
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.B \-\-password <password>, \-p <password>
Specifies a password to authenticate to the MongoDB instance. Use
in conjunction with the \fI\%--username\fP
option to supply a username.
.sp
If you specify a \fI\%--username\fP
without the \fI\%--password\fP option, \fI\%mongooplog\fP will
prompt for a password interactively.
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.B \-\-authenticationDatabase <dbname>
New in version 2.4.
.sp
Specifies the database that holds the user\(aqs (e.g
\fI\%--username\fP) credentials.
.sp
By default, \fI\%mongooplog\fP assumes that the database specified to the
\fI\-\-db\fP argument holds the user\(aqs credentials, unless you
specify \fI\%--authenticationDatabase\fP.
.sp
See \fBuserSource\fP,
\fB/reference/privilege\-documents\fP and
\fB/reference/user\-privileges\fP for more information about
delegated authentication in MongoDB.
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.B \-\-authenticationMechanism <name>
New in version 2.4.
.sp
Specifies the authentication mechanism. By default, the
authentication mechanism is \fBMONGODB\-CR\fP, which is the MongoDB
challenge/response authentication mechanism. In the MongoDB Subscriber Edition,
\fI\%mongooplog\fP also includes support for \fBGSSAPI\fP to handle
Kerberos authentication.
.sp
See \fB/tutorial/control\-access\-to\-mongodb\-with\-kerberos\-authentication\fP
for more information about Kerberos authentication.
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.B \-\-dbpath <path>
Specifies a directory, containing MongoDB data files, to which
\fI\%mongooplog\fP will apply operations from the \fIoplog\fP
of the database specified with the \fI\%--from\fP
option.  When used, the \fI\%--dbpath\fP option enables
\fBmongo\fP to attach directly to local data files and write
data without a running \fBmongod\fP instance. To run with
\fI\%--dbpath\fP, \fI\%mongooplog\fP needs to restrict access
to the data directory: as a result, no \fBmongod\fP can be
access the same path while the process runs.
.UNINDENT
.INDENT 0.0
.TP
.B \-\-directoryperdb
Use the \fI\%--directoryperdb\fP in conjunction with the
corresponding option to \fBmongod\fP. This option allows
\fI\%mongooplog\fP to write to data files organized with each
database located in a distinct directory. This option is only
relevant when specifying the \fI\%--dbpath\fP option.
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.INDENT 0.0
.TP
.B \-\-journal
Allows \fI\%mongooplog\fP operations to use the durability
\fIjournal\fP to ensure that the data files will
remain in a consistent state during the writing process. This
option is only relevant when specifying the \fI\%--dbpath\fP
option.
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.INDENT 0.0
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.B \-\-fields [field1[,field2]], \-f [field1[,field2]]
Specify a field or number fields to constrain which data
\fI\%mongooplog\fP will migrate. All other fields will be
\fIexcluded\fP from the migration. Comma separate a list of fields to
limit the applied fields.
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.B \-\-fieldFile <file>
As an alternative to "\fI\%--fields\fP" the
\fI\%--fieldFile\fP option allows you to specify a file
(e.g. \fB<file>\fP) that holds a list of field names to \fIinclude\fP in
the migration. All other fields will be \fIexcluded\fP from the
migration. Place one field per line.
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.B \-\-seconds <number>, \-s <number>
Specify a number of seconds of operations for \fI\%mongooplog\fP
to pull from the \fI\%remote host\fP. Unless
specified the default value is \fB86400\fP seconds, or 24 hours.
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.INDENT 0.0
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.B \-\-from <host[:port]>
Specify the host for \fI\%mongooplog\fP to retrieve \fIoplog\fP
operations from. \fI\%mongooplog\fP \fIrequires\fP this
option.
.sp
Unless you specify the \fI\%--host\fP option,
\fI\%mongooplog\fP will apply the operations collected with this
option to the oplog of the \fBmongod\fP instance running on
the localhost interface connected to port \fB27017\fP.
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.INDENT 0.0
.TP
.B \-\-oplogns <namespace>
Specify a namespace in the \fI\%--from\fP
host where the oplog resides. The default value is
\fBlocal.oplog.rs\fP, which is the where \fIreplica set\fP members
store their operation log. However, if you\(aqve copied \fIoplog\fP
entries into another database or collection, use this option to
copy oplog entries stored in another location.
.sp
\fINamespaces\fP take the form of
\fB[database].[collection]\fP.
.UNINDENT
.SS Usage
.sp
Consider the following prototype \fI\%mongooplog\fP command:
.sp
.nf
.ft C
mongooplog  \-\-from mongodb0.example.net \-\-host mongodb1.example.net
.ft P
.fi
.sp
Here, entries from the \fIoplog\fP of the \fBmongod\fP running
on port \fB27017\fP. This only pull entries from the last 24 hours.
.sp
In the next command, the parameters limit this operation to only apply
operations to the database \fBpeople\fP in the collection \fBusage\fP on
the target host (i.e. \fBmongodb1.example.net\fP):
.sp
.nf
.ft C
mongooplog  \-\-from mongodb0.example.net \-\-host mongodb1.example.net \-\-database people \-\-collection usage
.ft P
.fi
.sp
This operation only applies oplog entries from the last 24 hours. Use
the \fI\%--seconds\fP argument to capture a
greater or smaller amount of time. Consider the following example:
.sp
.nf
.ft C
mongooplog  \-\-from mongodb0.example.net \-\-seconds 172800
.ft P
.fi
.sp
In this operation, \fI\%mongooplog\fP captures 2 full days of
operations. To migrate 12 hours of \fIoplog\fP entries, use the
following form:
.sp
.nf
.ft C
mongooplog  \-\-from mongodb0.example.net \-\-seconds 43200
.ft P
.fi
.sp
For the previous two examples, \fI\%mongooplog\fP migrates entries
to the \fBmongod\fP process running on the localhost interface
connected to the \fB27017\fP port. \fI\%mongooplog\fP can also
operate directly on MongoDB\(aqs data files if no \fBmongod\fP is
running on the \fItarget\fP host. Consider the following example:
.sp
.nf
.ft C
mongooplog  \-\-from mongodb0.example.net \-\-dbpath /srv/mongodb \-\-journal
.ft P
.fi
.sp
Here, \fI\%mongooplog\fP imports \fIoplog\fP operations from the
\fBmongod\fP host connected to port \fB27017\fP. This migrates
operations to the MongoDB data files stored in the \fB/srv/mongodb\fP
directory. Additionally \fI\%mongooplog\fP will use the durability
\fIjournal\fP to ensure that the data files remain in a consistent
state.
.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2011-2013, 10gen, Inc.
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