Comment 14 for bug 1818614

Reviewed: https://review.openstack.org/643459
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=56c591996bdf3a2bda8855df4af5e4011779e5a2
Submitter: Zuul
Branch: stable/rocky

commit 56c591996bdf3a2bda8855df4af5e4011779e5a2
Author: Slawek Kaplonski <email address hidden>
Date: Sun Mar 10 22:45:15 2019 +0100

    Set initial ha router state in neutron-keepalived-state-change

    Sometimes in case of HA routers it may happend that
    keepalived will set status of router to MASTER before
    neutron-keepalived-state-change daemon will spawn "ip monitor"
    to monitor changes of IPs in router's namespace.

    In such case neutron-keepalived-state-change process will never
    notice that keepalived set router to be MASTER and L3 agent will
    not be notified about that so router will not be configured properly.

    To avoid such race condition neutron-keepalived-state-change will
    now check if VIP address is already configured on ha interface
    before it will spawn "ip monitor". If it is already configured
    by keepalived, it will notify L3 agent that router is set to
    MASTER.

    Change-Id: Ie3fe825d65408fc969c478767b411fe0156e9fbc
    Closes-Bug: #1818614
    (cherry picked from commit 8fec1ffc833eba9b3fc5f812bf881f44b4beba0c)