持久化动态修改

11.1.5.3 持久化动态修改

其实相对于VIP的切换,动态修改持久化则是比较常见的一个需求,一般在一主多从多Sentinel的HA环境中,为了性能常常在Master上关闭持久化,而在Slave上开启持久化,但是如果发生切换就必须有人工干预才能实现这个功能。可以利用client-reconfig-script自动化该进程,无需人工守护,我们就以RDB的动态控制为例: Sentinel配置文件如下:

sentinel client-reconfig-script mymaster /redis/script/rdbctl.sh

rdbctl.sh源代码:

!/bin/bash

_DEBUG="on"
DEBUGFILE="/smsred/redis-3.0.4/log/sentinel_failover.log"
MASTERIP=${6}
MASTERPORT=${7}
SLAVEIP=${4}
SLAVEPORT=${5}
MASK='24'
IFACE='bond0'
MYIP=$(ip -4 -o addr show dev ${IFACE}| grep -v secondary| awk '{split($4,a,"/");print a[1]}')

DEBUG () {
        if [ "$_DEBUG" = "on" ]; then
                echo `$@` >>  ${DEBUGFILE}
        fi
}

set -e
DEBUG date
DEBUG echo $@ 
DEBUG echo "===Begin Failover==="
#If Master

if [ ${MASTERIP} = ${MYIP} ]; then
       #Disable RDB
       redis-cli -h ${MYIP} -p ${MASTERPORT} -a c1m2b3c4 config set save ""
       DEBUG echo ${MYIP}
       DEBUG echo "Disable Master RDB:" ${MYIP} ${MASTERPORT}
        DEBUG echo "===End Failover==="
        exit 0

#Or Slave
else
        echo "test5" >> $DEBUGFILE
       redis-cli -h ${MYIP} -p ${SLAVEPORT} -a c1m2b3c4 config set save "900 1 300 10 60 100000000"
       DEBUG echo ${MYIP}
       DEBUG echo "Enable Slave RDB:" ${MYIP} ${SLAVEPORT}
        DEBUG echo "===End Failover==="
        exit 0
fi

exit 1

原理和VIP切换一节基本一致,不再赘述。