Hi,
In ovsdb.7, it says " OVSDB can layer replication on top of any of its service
models". I am trying to figure out how to setup the ovsdb replication for a
raft OVSDB cluster.
My initial thought is that --sync-from would take the 3 endpoints (for a 3 node
cluster) and ovsdb-server directly syncs from the leader of the cluster, but it
seems that it is not what I expected:
1. --sync-from does not take more than one endpoint, if I specify
"--sync_from=tcp:<ip1>:6641,tcp:<ip2>:6641,tcp:<ip3>:6641" when running the
ovsdb-server, it just prompts the error message:
"connection attempt failed (Address family not supported by
protocol)".
Looking at the code,
ovsdb_replication_init()->replication_init()->jsonrpc_session_open(sync_from,
true), which does assume that sync_from() only takes one end point.
2. I then continued my test to sync-from one node from the cluster. I started
by running "ovsdb-tool create /var/lib/openvswitch/ovnnb_db_repl.db
/usr/share/ovn/ovn-nb.ovsschema", then ran ovsdb-server --sync-from to point to
one of the cluster node only, but it prompts another error messages:
"2020-06-10T15:54:06Z|00022|replication|INFO|Schema version
mismatch, checking if OVN_Northbound can still be replicated or not.
2020-06-10T15:54:06Z|00023|replication|INFO|Column is_connected
mismatch in local db schema table Connection.
2020-06-10T15:54:06Z|00024|replication|INFO|OVN_Northbound cannot
be replicated.
2020-06-10T15:54:06Z|00025|replication|WARN|Nothing to replicate. "
I believe the DB_schema is the right version. It seems it is complaining
the _Server schema difference between the cluster DB (it syncs from) and its
own standalone DB. So do we suppose to create a one-node cluster DB to
replicate the clustered DB?
Please suggest what is the best practice to setup the ovsdb replication for
clustered mode OVSDB.
Thanks
- Yun
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