[ovs-discuss] [OVN] ovn-northd HA

Tony Liu tonyliu0592 at hotmail.com
Sun Aug 2 00:26:12 UTC 2020


Hi,

I have a few questions about ovn-northd HA.

Does the lock for active ovn-northd have to be acquired from the leader
of sb-db?

If ovn-northd didn't acquire the lock, it becomes standby. Does it keep
trying to acquire the lock, or wait for notification, or monitor the
active ovn-northd?

If it keeps trying, what's the period?

Say the active ovn-northd is down, the connection to sb-db is down,
sb-db releases the lock, so another ovn-northd can acquire it.
Is that correct?

When sb-db is busy, the connection from ovn-northd is dropped. Not sure
from which side it's dropped. And that triggers active ovn-northd switch.
Is that right?

In case that sb-db leader switchs, is that going to cause active
ovn-northd switch as well?

For whatever reason, in case active ovn-northd switches, is the new
active ovn-northd going to continue the work left by the previous leader,
or start all over again?


Thanks!

Tony



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