Hi Andy, I have started working on integrating ovsdb-server HA support with pacemaker (via OCF heartbeat, i.e ocf:heartbeat).
Few comments below. > > >>> Thanks for helping out. > >>> > >>> Given that, I now plan to work from bottom up, initially focusing on > >>> ovsdb server changes. > >>> > >>> 1. Add a state in ovsdb-server for it to know whether it is an active > >>> server. Backup server will not accept any connections. Server > started with > >>> --sync-from argument will be put in the back state by default. > >>> > >>> 2. Add appctl commands to allow manually switch state. > >>> > In order to write the ocf script for ovsdb-server, we need a mechanism to - know if the ovsdb-server instance is running as master or slave - to switch the state of the ovsdb-server to either master or slave. The initial (very dirty, not working properly) ocf script can be found here - [1] I know you have already mentioned about adding this support above. This is just a confirmation that it would be consumed by the pacemaker ocf script once available. [1] - https://github.com/numansiddique/resource-agents/commit/7f6c4d8977c7cf525ec22793d8adf5b308bc431e Thanks Numan >>> 3. Add a new table for backup server to register its address and ports. > >>> OVSDB clients can learn about them at run time. Back up server should > issue > >>> an > >>> transaction to register its address before issuing the monitoring > >>> request. This feature is not strictly necessary, and can be pushed to > HA > >>> manager, > >>> but having it built into ovsdb-server may make it simpler for > >>> integrationl. > >>> > >>> What do you think? > >>> > >>> > >>> > >> Russell, Would HA manager also manage ovn-controller switch over? > >> > > > > Yes, indirectly. The way this is typically handled is by using a virtual > > IP that moves to whatever host is currently the master > > > Cool, then ovn-controller does not have to be HA aware. > > > > > > > > > > -- > > Russell Bryant > > > _______________________________________________ > dev mailing list > dev@openvswitch.org > http://openvswitch.org/mailman/listinfo/dev > _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
