vip-units.sh: show juju unit holding the vip for each passed service, or --all // keywords: juju, openstack, ha, vip

vip-units.sh

#!/bin/bash
# vip-units.sh: show juju unit holding the vip for each passed service, or --all 
#               it forks for each service, to lower result times
#
# Author: JuanJo Ciarlante <jjo@canonical.com>
# License: GPLv3
#
# Show unit holding the vip, unfortunately can't use "crm foo"
# as it shows hostnames, which are useless for LXC over MaaS
services=${*:?missing service(s), eg: keystone cinder}

vip_unit() {
    # get vip from services config
    local vip=$(juju get $1 | python -c 'import yaml, sys;print yaml.load(sys.stdin)["settings"].get("vip", {}).get("value", "")')
    test -n "$vip" || continue
    # sweep on each unit, grepping ip addresses for $vip 
    juju run --timeout 5s --service=$1 "ip -o -4 a|fgrep $vip && echo unit:$vip \$JUJU_UNIT_NAME"|sed -n 's/.*unit://p'
}
# main()
if [ "$1" == '--all' ];then
    # All services from juju status, skipped if they don't have a 'vip' setting
    services=$(juju status |python -c 'import yaml,sys;print " ".join(yaml.load(sys.stdin)["services"].keys())')
fi
for i in $services; do
    vip_unit $i &
done | sort

Related to deploying Openstack HA with Juju: https://wiki.ubuntu.com/ServerTeam/OpenStackHA