现网环境中有两个数据库主机，master， 和slave。以及一个vip
Master： 192.168.11.149
Slave：192.168.11.150
Vip：192.168.200.200
节点A Redis-Master 主节点，节点B Redis-Slave 备用节点，虚拟IP是对外提供访问的IP。虚拟IP在某个时刻只能属于某一个节点，另一个节点作为备用节点存在。当主节点不可用时，备用节点接管虚拟IP，提供正常服务。
安装redis
redis master安装
下载redis-3.0.3.tar.gz 创建redis 账户
<code>#useradd -d /home/cin_redis –s /bin/bash –m cin_redis # passwd cin_redis /<code>
上传redis-3.0.3.tar.gz 解压
<code># tar –xzvf redis-3.0.3.tar.gz #cd rediis-3.0.3/src #mak MALLOC=libc #make PREFIX=$HOME install /<code>
在redis的解压目录下有一个redis.conf 文件，编辑redis.conf文件
<code>daemonize yes 后台模式运行 port 15093 端口 logfile “/home/cin_redis/redis-15093.log” pidfile “/home/cin_redis/redis-15093.pid” /<code>
可以把该配置文件拷贝到bin目录下修改；启动redis
<code># redis-server redis.conf /<code>
redis slave 安装
redis slave机器上同样安装redis 数据库，安装步骤同2.1安装，修改redis.conf 文件
<code>#后台模式运行 daemonize yes port 15093 logfile “/home/cin_redis/redis-15093.log” pidfile “/home/cin_redis/redis-15093.pid” slaveof 192.168.11.149 15093 /<code>
可以把该配置文件拷贝到bin目录下修改；启动redis
<code>#redis-server redis.conf /<code>
用redis-cli 客户端连接redis-master数据库，查看replication
用redis-cli客户端连接redis-slave数据库，查看replication
安装keepalived
下载keepalived-1.2.2 创建keepalived 账户
<code>#useradd –m keepalived –d /home/keepalived –s /bin/bash #passwd keepalived /<code>
上传keepalived-1.2.23.tar.gz
<code>#tar –xzvf keepalived-1.2.23.tar.gz #cd keepalived-1.2.23 #./configure –prefix=$HOME/keepalive # make &make install # cp -r /home/keepalived/keepalive/etc/keepalived /etc # cp /home/keepalived/keepalive/etc/rc.d/init.d/keepalived /etc/rc.d/init.d #cp /home/keepalived/keepalive/etc/sysconfig/keepalived /etc/sysconfig #ln –s /home/keepalived/keepalive/sbin/keepalived /usr/sbin/ #chkconfig –add keepalived /<code>
按照以上步骤分别在redis-master 和 redis-slave 主机上安装keepalived工具
配置keepalived
redis master 配置
按照上面的步骤安装完keepalived，vim 打开/etc/keepalived下面的keepalived.conf 文件配置
<code>! Configuration File for keepalived vrrp_script chk_redis { >
在/etc/keepalived 目录下创建scripts，
<code>#cd /etc/keepalived/scripts #touch redis_master.sh #touch redis_backup.sh #touch redis_fault.sh] #touch redis_stop.sh #touch redis_check.sh /<code>
redis_master.sh : 当keepalived切换成master时，会触发执行此脚本
redis_backuo.sh : 当keepalived 切换成slave时，会触发执行此脚本
redis_fault.sh : 当keepalived 出错时，会触发执行此脚本
redis_stop.sh : 当keepalived 停止时，会触发执行次脚本
redis_check.sh : keepalived定时调用此脚本检测redis 数据库是否连接正常
redis_master.sh文件内容：
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.149" REMOTEIP="192.168.11.150" PORT="15093" echo "[master]" >> $LOGFILE date >> $LOGFILE echo "Beging master..." >> $LOGFILE 2>&1 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1 sleep 10 echo "Run SLAVEOF NO ONE cmd..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF NO ONE >> $LOGFILE 2>&1 /<code>
redis_backup.sh文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.149" REMOTEIP="192.168.11.150" PORT="15093" echo "[backup]" >> $LOGFILE date >> $LOGFILE echo "Beging slave..." >> $LOGFILE 2>&1 sleep 15 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PROT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1 /<code>
redis_fault.sh 文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.149" REMOTEIP="192.168.11.150" PORT="15093" echo "[ERROR]-----keepalived is fault,change local redis to slave-----" >> $LOGFILE date >> $LOGFILE echo "Beging slave..." >> $LOGFILE 2>&1 sleep 10 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1 /<code>
redis_stop.sh 文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.149" REMOTEIP="192.168.11.150" PORT="15093" echo "[ERROR]-----keepalived is stop,change local redis to slave-----" >> $LOGFILE date >> $LOGFILE echo "Beging slave..." >> $LOGFILE 2>&1 sleep 10 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1 /<code>
redis_check.sh 文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.149" REMOTEIP="192.168.11.150" PORT="15093" ALIVE=`$REDISCLI -h $LOCALIP -p $PORT PING` if [ "$ALIVE" == "PONG" ];then echo "[INFO] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is health." >> $LOGFILE exit 0 else service keepalived stop echo "[ERROR] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is not health." >> $LOGFILE exit 1 fi /<code>
redis slave 配置
按照上面的步骤安装完keepalived，vim 打开/etc/keepalived下面的keepalived.conf 文件配置
<code>! Configuration File for keepalived vrrp_script chk_redis { >
在/etc/keepalived 目录下创建scripts，
<code>#cd /etc/keepalived/scripts #touch redis_master.sh #touch redis_backup.sh #touch redis_fault.sh #touch redis_stop.sh #touch redis_check.sh /<code>
redis_master.sh : 当keepalived切换成master时，会触发执行此脚本
redis_backuo.sh : 当keepalived 切换成slave时，会触发执行此脚本
redis_fault.sh : 当keepalived 出错时，会触发执行此脚本
redis_stop.sh : 当keepalived 停止时，会触发执行次脚本
redis_check.sh : keepalived定时调用此脚本检测redis 数据库是否连接正常
redis_master.sh 文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.150" REMOTEIP="192.168.11.149" PORT="15093" echo "[master]" >> $LOGFILE date >> $LOGFILE echo "Beging master..." >> $LOGFILE 2>&1 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1 sleep 10 echo "Run SLAVEOF NO ONE cmd..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF NO ONE >> $LOGFILE 2>&1 /<code>
redis_backup.sh 文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.150" REMOTEIP="192.168.11.149" PORT="15093" echo "[backup]" >> $LOGFILE date >> $LOGFILE echo "Beging slave..." >> $LOGFILE 2>&1 sleep 15 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1 /<code>
redis_fault.sh 文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.150" REMOTEIP="192.168.11.149" PORT="15093" echo "[ERROR]-----keepalived is fault,change local redis to slave-----" >> $LOGFILE date >> $LOGFILE echo "Beging slave..." >> $LOGFILE 2>&1 sleep 10 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1 /<code>
redis_stop.sh 文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.150" REMOTEIP="192.168.11.149" PORT="15093" echo "[ERROR]-----keepalived is stop,change local redis to slave-----" >> $LOGFILE date >> $LOGFILE echo "Beging slave..." >> $LOGFILE 2>&1 sleep 10 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1 /<code>
redis_check.sh 文件内容
<code>#!/bin/bash KPATH=/home/keepalived RPATH=/home/cin_redis REDISCLI=$RPATH/bin/redis-cli LOGFILE=$KPATH/log/keepalived-redis-state.log LOCALIP="192.168.11.150" REMOTEIP="192.168.11.149" PORT="15093" ALIVE=`$REDISCLI -h $LOCALIP -p $PORT PING` if [ "$ALIVE" == "PONG" ];then echo "[INFO] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is health." >> $LOGFILE exit 0 else service keepalived stop echo "[ERROR] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is not health." >> $LOGFILE exit 1 fi /<code>