Hi Ben, thanks for your answer but could you please clarify this sentence
"There isn't any reason that ovn-northd needs to connect to northbound and
southbound databases simultaneously."
How would it work then? My understanding is that ovn-northd translates data
from Northbound to Southbound dbs as well as propagates some changes backwards
like port status. If it only connects to one end, say Southbound, then how does
it work?
Arkadi Poliakevitch | Enterprise Applications
e. [email protected]
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-----Original Message-----
From: Ben Pfaff <[email protected]>
Sent: Tuesday, May 25, 2021 5:40 AM
To: Arkadi Poliakevitch <[email protected]>
Cc: [email protected]
Subject: Re: [ovs-discuss] OVN cluster: how to ensure that both northbound and
southbound instances are leaders on the same node?
On Mon, May 24, 2021 at 06:49:56AM +0000, Arkadi Poliakevitch wrote:
> I'm recently puzzled at the situation when northbound ovsdb-server is
> the leader on one cluster node but the southbound ovsdb-server is the
> leader on the other node. My understanding is that the same ovn-northd
> instance should connect to both northbound and southbound sockets at
> the same time in order to function properly, which is not the case.
> One ovn-northd instance locks the connection to the southbound leader
> and the other ovn-northd instance - to the northbound leader, which
> makes no sense, of course. Any thoughts on this?
The northbound and southbound databases are independent. There is no need for
them to have the same cluster nodes. They don't even necessarily both have to
be clustered databases.
There isn't any reason that ovn-northd needs to connect to northbound and
southbound databases simultaneously. In fact, the idea of simultaneity in a
distributed system is problematic.
ovn-northd only locks the connection to the southbound database.
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