Source: openvswitch
Severity: important
OVS is a software switch, and as such providing primarily L2 features. Therefore
it's unfortunate that it starts after networking (i.e. ifupdown) that may be
used
to configure bridge ports provided by OVS.
Consider this configuration:
ovs-vsctl add-br br0
ovs-vsctl add-bond br0 bond0 eth0 eth1 lacp=active
/etc/network/interfaces
auto br0
iface br0 inet static
address 10.10.100.84
netmask 255.255.255.128
network 10.10.100.0
broadcast 10.10.100.127
gateway 10.10.100.1
auto eth0
auto eth0 inet manual
auto eth1
auto eth1 inet manual
In such a setup there is no way where you ever could end up with a networking
setup that ends in remote reachable machine and is thus locking you out. This is
because ifupdown starts before openvswitch-{switch, controller}. Thus, ifupdown
does not find that interface as it isn't provided at this stage during the boot.
A possible fix would be to let openvswitch-{switch, controller} start before the
network. For example these LSB headers would do the job:
# X-Start-Before: networking
# Required-Start: $local_fs
# Required-Stop:
# Default-Start: S
# Default-Stop: 0 6
Arguably this is a cyclic dependency as - depending on the configuration - OVS
may
indeed rely on a working network to connect to a remote controller. In such
setups
it is probably advised to keep things as is, although OVS may still come up and
fail to connect to the controller which isn't that bad as it keeps reconnecting
I
guess. That being said I believe that my use case is more common for OVS and
should thus be fixed.
Alternatively OVS should provide a way to configure it's own L3 stuff itself so
that
such cyclic dependencies could be avoided. For example, the whole problem could
be
avoided if the IP configuration was stored in the OVS database.
-- System Information:
Debian Release: jessie/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.9-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
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