** Changed in: neutron
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1257014
Title:
Atomically setup OVS ports
Status in OpenStack Neutron (virtual network service):
Fix Released
Bug description:
Normal operation of the openvswitch-agent results in various warning
and error messages being logged to /var/log/openvswitch/ovs-
vswitchd.log, which, although not representing actual failures, can
cause concern.
For example, setting up the patch port connecting br-int and br-tun
results in:
2013-12-02T16:35:45Z|00103|netdev_vport|ERR|patch-tun: patch type requires
valid 'peer' argument
2013-12-02T16:35:45Z|00104|bridge|WARN|could not configure network device
patch-tun (Invalid argument)
2013-12-02T16:35:45Z|00105|netdev_vport|ERR|patch-tun: patch type requires
valid 'peer' argument
2013-12-02T16:35:45Z|00106|bridge|WARN|could not configure network device
patch-tun (Invalid argument)
2013-12-02T16:35:45Z|00107|bridge|INFO|bridge br-int: added interface
patch-tun on port 1
2013-12-02T16:35:46Z|00108|netdev_linux|WARN|ethtool command ETHTOOL_GFLAGS
on network device patch-int failed: No such device
2013-12-02T16:35:46Z|00109|dpif|WARN|system@ovs-system: failed to add
patch-int as port: No such device
2013-12-02T16:35:46Z|00110|netdev_vport|ERR|patch-int: patch type requires
valid 'peer' argument
2013-12-02T16:35:46Z|00111|bridge|WARN|could not configure network device
patch-int (Invalid argument)
2013-12-02T16:35:46Z|00112|bridge|INFO|bridge br-tun: added interface
patch-int on port 1
And setting up a tunnel port on br-tun results in:
2013-12-02T16:35:48Z|00113|netdev_linux|WARN|ethtool command ETHTOOL_GFLAGS
on network device gre-1 failed: No such device
2013-12-02T16:35:48Z|00114|dpif|WARN|system@ovs-system: failed to add gre-1
as port: No such device
2013-12-02T16:35:49Z|00115|netdev_vport|ERR|gre-1: gre type requires valid
'remote_ip' argument
2013-12-02T16:35:49Z|00116|bridge|WARN|could not configure network device
gre-1 (Invalid argument)
2013-12-02T16:35:49Z|00117|bridge|INFO|bridge br-tun: added interface gre-1
on port 2
These messages seem to be due to the
neutron.agent.linux.ovs_lib.add_patch_port() and
neutron.agent.linux.ovs_lib.add_tunnel_port() functions setting DB attributes
one-by-one, which results in invalid intermediate states. In addition to the
noise in the log files, attempts to use the ports while in these intermediate
states could result in transient incorrect behavior.
This can be resolved by changing these functions to atomically create
and configure the OVS ports using a single ovs-vsctl command, with
multiple sub-commands separated by "--" as arguments. This would also
have the benefit of reducing the overhead of executing multiple
commands via rootwrap when a single command would do.
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