在Redis-Sentinel的client-reconfig-script脚本中设置VIP
当使用Redis-Sentinel做冗余时，如何以不同方式使用VIP，我认为使用client-reconfig-script脚本是一种可行方法，让我们试试。redis1 172.16.171.100/24
redis2 172.16.171.110/24
redis3 172.16.171.120/24
VIP 172.16.171.250/24
sentinel.conf配置：
port 26379
daemonize yes
logfile "/usr/local/redis/sentinel.log"
dir "/usr/local/redis/tmp"
sentinel monitor mymaster 172.16.171.120 6379 2
sentinel down-after-milliseconds mymaster 3000
sentinel failover-timeout mymaster 60000
sentinel notification-script mymaster /usr/local/redis/notify.sh
sentinel client-reconfig-script mymaster /usr/local/redis/failover.sh
sentinel auth-pass mymaster skymobi
failover.sh
#!/bin/sh
_DEBUG="on"
DEBUGFILE=/usr/local/redis/sentinel_failover.log
VIP='172.16.171.250'
MASTERIP=${6}
MASK='24'
IFACE='eth0'
MYIP=$(ip -4 -o addr show dev ${IFACE}| grep -v secondary| awk '{split($4,a,"/");print a}')
DEBUG () {
if [ "$_DEBUG" = "on" ]; then
$@
fi
}
rm -rf ${DEBUGFILE}
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) -eq 0 ]; then
/sbin/ip addr add ${VIP}/${MASK} dev ${IFACE}
DEBUG echo "sudo /sbin/ip addr add ${VIP}/${MASK} dev ${IFACE}" >> ${DEBUGFILE}
/usr/sbin/arping -q -c 3 -A ${VIP} -I ${INTERFACE}
fi
exit 0
else
if [ $(ip addr show ${IFACE} | grep ${VIP} | wc -l) -ne 0 ]; then
/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
结论
之后你可以尝试kill master而不是宕机来测试failover，我认为这是个比较好且容易实现的方法。
sentinel down-after-milliseconds mymaster 3000
大约在3秒左右会检测到redis的宕机。在更恶劣的环境，可以尝试减小这个值。
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