Hi,

I am using Openstack Wallaby release with OVN on Ubuntu 20.04. My environment consists of 2 compute nodes and 1 controller node.

ovs-vswitchd (Open vSwitch) 2.15.0 Ubuntu Kernel Version: 5.4.0-88-generic - compute node1 172.16.30.1 - compute node2 172.16.30.3 - controller-khi01/Network node/Primary ovs-db IP 172.16.30.46 - backup ovs-db 172.16.30.47

I want to run OVSDB server to run in Active/Passive mode. Active OVSDB-server is on node "controller-khi01" and Passive OVSDB-server is on "controller02-khi01". I have setup Pacemaker to manage the ovn-northd(Open vSwitch) service between primary and backup ovn-db server. You can see the "pcs status" output below. But I am unable to replicate database state between primary and backup OVSDB server. If i execute "ovsdb-server --sync-from=server" command, getting below error.

root@controller-khi01# ovsdb-server --sync-from=172.16.30.47 2021-12-14T09:16:29Z|00001|lockfile|WARN|/var/lib/openvswitch/.conf.db.~lock~: cannot lock file because it is already locked by pid 14121 ovsdb-server: I/O error: /etc/openvswitch/conf.db: failed to lock lockfile (Resource temporarily unavailable)

root@controller-khi01# pcs status Cluster name: cluster1 Cluster Summary: * Stack: corosync * Current DC: controller-khi01 (version 2.0.3-4b1f869f0f) - partition with quorum * Last updated: Tue Dec 14 07:53:06 2021 * Last change: Tue Dec 14 06:16:21 2021 by hacluster via crmd on controller02-khi01 * 2 nodes configured * 3 resource instances configured

Node List: * Online: [ controller-khi01 controller02-khi01 ]

Full List of Resources: * Clone Set: ovndb_servers-clone [ovndb_servers] (promotable): * Masters: [ controller-khi01 ] * Slaves: [ controller02-khi01 ] * ovn-virtual-ip (ocf::heartbeat:IPaddr2): Started controller-khi01

Failed Resource Actions: * ovndb_servers_monitor_10000 on controller02-khi01 'master' (8): call=17, status='complete', exitreason='', last-rc-change='2021-12-14 06:48:26Z', queued=0ms, exec=0ms

Daemon Status: corosync: active/enabled pacemaker: active/enabled pcsd: active/enabled

I would really appreciate any input in this regard.

Best regards,

Faisal Sheikh