On Wednesday 31 August 2016 02:42 AM, Andy Zhou wrote:


On Thu, Aug 25, 2016 at 6:48 AM, <bscha...@redhat.com <mailto:bscha...@redhat.com>> wrote:

    This patch adds support to start_ovsdb() function in ovn-ctl to
    start the
    ovn db servers in standby mode. This can be done in the following ways
    1. Use parameters --ovn-nb-sync-from-addr and
    --ovn-sb-sync-from-addr to
       set the addresses of the master server.
    2. Create files $etcdir/ovnnb-master.conf and
    $etcdir/ovnsb-master.conf
       with the tcp url of the master servers.

    If --ovn-nb-sync-from-addr and --ovn-sb-sync-from-addr is used, it
    will
    overwrite the contents in the $etcdir/*.conf and use that server
    as the
    master.

    Additional functions to promote a standby server to master and demote
    master server to standby mode are also added in this patch

    Signed-off-by: Babu Shanmugam <bscha...@redhat.com
    <mailto:bscha...@redhat.com>>


In the context of OVSDB HA, we have been calling the ovsdb-server pair as active/backup. It would be nice if we can avoid using another term "master". I have no strong preference
for "active", just want to avoid using another term.

I will change it in the next revision.

It seems that if demote_ovssb() is followed by restart_ovsdb(), the role switching
won't be respected. true?
You are right Andy. I will fix this too.

Thank you
Thanks.

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