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Shell script to migrate a VIP to the actual redis master when managing them with redis-sentinel
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#!/bin/sh | |
_DEBUG="on" | |
DEBUGFILE=/tmp/sentinel_failover.log | |
VIP='10.125.125.30' | |
MASTERIP=${6} | |
MASK='24' | |
IFACE='eth0' | |
MYIP=$(ip -4 -o addr show dev ${IFACE}| grep -v secondary| awk '{split($4,a,"/");print a[1]}') | |
DEBUG () { | |
if [ "$_DEBUG" = "on" ]; then | |
$@ | |
fi | |
} | |
set -e | |
DEBUG date >> ${DEBUGFILE} | |
DEBUG echo $@ >> ${DEBUGFILE} | |
DEBUG echo "Master: ${MASTERIP} My IP: ${MYIP}" >> ${DEBUGFILE} | |
if [ ${MASTERIP} = ${MYIP} ]; then | |
if [ $(ip addr show ${IFACE} | grep ${VIP} | wc -l) = 0 ]; then | |
sudo /sbin/ip addr add ${VIP}/${MASK} dev ${IFACE} | |
DEBUG echo "sudo /sbin/ip addr add ${VIP}/${MASK} dev ${IFACE}" >> ${DEBUGFILE} | |
sudo /usr/sbin/arping -q -c 3 -A ${VIP} -I ${INTERFACE} | |
fi | |
exit 0 | |
else | |
if [ $(ip addr show ${IFACE} | grep ${VIP} | wc -l) != 0 ]; then | |
sudo /sbin/ip addr del ${VIP}/${MASK} dev ${IFACE} | |
DEBUG echo "sudo /sbin/ip addr del ${VIP}/${MASK} dev ${IFACE}" >> ${DEBUGFILE} | |
fi | |
exit 0 | |
fi | |
exit 1 |
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