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| author | Yifeng Sun <pkusunyifeng@gmail.com> | 2018-06-26 14:06:21 -0700 |
|---|---|---|
| committer | Ben Pfaff <blp@ovn.org> | 2018-07-06 13:50:00 -0700 |
| commit | 771680d96fb6f996987630cb85bb749478512268 (patch) | |
| tree | e3fddb4c770f88e405fd82787933216fc5b1ac58 /Documentation/intro/install/general.rst | |
| parent | def5b366a3626fddc87a449e8447f79a6957d55f (diff) | |
| download | openvswitch-771680d96fb6f996987630cb85bb749478512268.tar.gz | |
DNS: Add basic support for asynchronous DNS resolving
This patch is a simple implementation for the proposal discussed in
https://mail.openvswitch.org/pipermail/ovs-dev/2017-August/337038.html and
https://mail.openvswitch.org/pipermail/ovs-dev/2017-October/340013.html.
It enables ovs-vswitchd and other utilities to use DNS names when specifying
OpenFlow and OVSDB remotes.
Below are some of the features and limitations of this patch:
- Resolving is asynchornous in daemon context, avoiding blocking main loop;
- Resolving is synchronous in general utility context;
- Both IPv4 and IPv6 are supported;
- The resolving API is thread-safe;
- Depends on the unbound library;
- When multiple ip addresses are returned, only the first one is used;
- /etc/nsswitch.conf isn't respected as unbound library doesn't look at it;
- For async-resolving, caller need to retry later; there is no callback.
Signed-off-by: Yifeng Sun <pkusunyifeng@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
Diffstat (limited to 'Documentation/intro/install/general.rst')
| -rw-r--r-- | Documentation/intro/install/general.rst | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/intro/install/general.rst b/Documentation/intro/install/general.rst index 474c9e861..fe30c19ad 100644 --- a/Documentation/intro/install/general.rst +++ b/Documentation/intro/install/general.rst @@ -93,6 +93,10 @@ need the following software: - Python 2.7. You must also have the Python ``six`` library version 1.4.0 or later. +- Unbound library, from http://www.unbound.net, is optional but recommended if + you want to enable ovs-vswitchd and other utilities to use DNS names when + specifying OpenFlow and OVSDB remotes. If unbound library is already + installed, then Open vSwitch will automatically build with support for it. On Linux, you may choose to compile the kernel module that comes with the Open vSwitch distribution or to use the kernel module built into the Linux kernel |