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一．简介 安装使用centos 5.6(64) Master 192.168.2.235 Slave 192.168.2.236 Vip 192.168.2.200 编译环境 yum -y install gcc gcc+ gcc-c++ openssl openssl-devel pcre pcre-devel 当 Master 与 Slave 均运作正常时, Master负责服务，Slave负责Standby； 当 Master 挂掉，Slave 正常时, Slave接管服务，同时关闭主从复制功能； 当 Master 恢复正常，则从Slave同步数据，同步数据之后关闭主从复制功能，恢复Master身份，于此同时Slave等待Master同步数据完成之后，恢复Slave身份。 然后依次循环。 需要注意的是，这样做需要在Master与Slave上都开启本地化策略，否则在互相自动切换的过程中，未开启本地化的一方会将另一方的数据清空，造成数据完全丢失 二．安装 Gperftools安装 tar xzvf gperftools-2.1.tar.gz cd gperftools-2.1 . ./configure --enable-frame-pointers make make install mv /usr/local/lib/libtcmalloc.so.4 /usr/lib64/ Keepalived安装 tar xf keepalived-1.2.12.tar.gz cd keepalived-1.2.12 ./configure make && make install cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/ cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/ chmod +x /etc/init.d/keepalived chkconfig –add keepalived mkdir /etc/keepalived ln –s /usr/local/sbin/keepalived /usr/sbin Redis安装 tar xf redis-2.8.10.tar.gz cd redis2.8.10 mkdir –p /opt/redis make PREFIX=/opt/redis USE_TCMALLOC=yes FORCE_LIBC_MALLOC=yes install 三．配置 创建配置文件夹以及文件 mkdir -p /opt/redis/etc mkdir -p /opt/redis/run mkdir -p /opt/redis/data/6379 mkdir -p /opt/redis/log cp /root/redis-2.8.10/redis.conf /opt/redis/etc/redis.conf mv /opt/redis/etc/redis.conf /opt/redis/etc/redis_6379.conf 修改配置文件： vim /opt/redis/etc/redis_6379.conf daemonize yes pidfile /opt/redis/run/redis_6379.pid dir /opt/redis/data/6379 logfile /opt/redis/log/redis_6379.log 创建服务管理脚本 vim /etc/init.d/redis #!/bin/sh PATH="/opt/redis/bin:$PATH" EXEC="/opt/redis/bin/redis-server" CLIEXEC="/opt/redis/bin/redis-cli" PIDFILE="/opt/redis/run/redis_6379.pid" CONF="/opt/redis/etc/redis_6379.conf" REDISPORT="6379" case "$1" in start) if [ -f $PIDFILE ] then echo "$PIDFILE exists, process is already running or crashed." else echo "Starting Redis server..." $EXEC $CONF fi ;; stop) if [ ! -f $PIDFILE ] then echo "$PIDFILE does not exist, process is not running." else PID=$(cat $PIDFILE) echo "Stopping ..." $CLIEXEC -p $REDISPORT shutdown while [ -x /proc/${PID} ] do echo "Waiting for Redis to shutdown ..." sleep 1 done echo "Redis stopped." fi ;; *) echo "Usage: $0 {start|stop}" >&2 exit 1 ;; esac 授权 chmod +x /etc/init.d/redis vim /etc/sysctl.conf 在最后添加以下节点: vm.overcommit_memory = 1 #sysctl –p 启动redis /etc/init.d/redis start 验证
ps aux | grep redis 首先在master上创建如下配置 mkdir –p /etc/keepalived vim /etc/keepalived/keepalived.conf vrrp_script chk_redis { script "/etc/keepalived/scripts/redis_check.sh" ###监控脚本 interval 2 ###监控时间 } vrrp_instance VI_1 { state MASTER ###设置为MASTER interface eth0 ###监控网卡 virtual_router_id 51 priority 101 ###权重值 authentication { auth_type PASS ###加密 auth_pass redis ###密码 } track_script { chk_redis ###执行上面定义的chk_redis } virtual_ipaddress { 192.168.2.200 ###VIP } notify_master /etc/keepalived/scripts/redis_master.sh notify_backup /etc/keepalived/scripts/redis_backup.sh notify_fault /etc/keepalived/scripts/redis_fault.sh notify_stop /etc/keepalived/scripts/redis_stop.sh } vim /etc/keepalived/scripts/redis_master.sh #!/bin/bash REDISCLI="/opt/redis/bin/redis-cli" LOGFILE="/var/log/keepalived-redis-state.log" echo "[master]" >> $LOGFILE date >> $LOGFILE echo "Being master...." >> $LOGFILE 2>&1 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI SLAVEOF 192.168.2.236(slave) 6379 >> $LOGFILE 2>&1 sleep 10 #延迟10秒以后待数据同步完成后再取消同步状态 echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE $REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1 vim /etc/keepalived/scripts/redis_backup.sh #!/bin/bash REDISCLI="/opt/redis/bin/redis-cli" LOGFILE="/var/log/keepalived-redis-state.log" echo "[backup]" >> $LOGFILE date >> $LOGFILE echo "Being slave...." >> $LOGFILE 2>&1 sleep 15 #延迟15秒待数据被对方同步完成之后再切换主从角色 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI SLAVEOF 192.168.2.236(slave) 6379 >> $LOGFILE 2>&1 在slave上创建如下文件： vim /etc/keepalived/keepalived.conf vrrp_script chk_redis { script "/etc/keepalived/scripts/redis_check.sh" ###监控脚本 interval 2 ###监控时间 } vrrp_instance VI_1 { state BACKUP ###设置为BACKUP interface eth0 ###监控网卡 virtual_router_id 51 priority 100 ###比MASTRE权重值低 authentication { auth_type PASS auth_pass redis ###密码与MASTRE相同 } track_script { chk_redis ###执行上面定义的chk_redis } virtual_ipaddress { 192.168.2.200 ###VIP } notify_master /etc/keepalived/scripts/redis_master.sh notify_backup /etc/keepalived/scripts/redis_backup.sh notify_fault /etc/keepalived/scripts/redis_fault.sh notify_stop /etc/keepalived/scripts/redis_stop.sh } vim /etc/keepalived/scripts/redis_master.sh #!/bin/bash REDISCLI="/opt/redis/bin/redis-cli" LOGFILE="/var/log/keepalived-redis-state.log" echo "[master]" >> $LOGFILE date >> $LOGFILE echo "Being master...." >> $LOGFILE 2>&1 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI SLAVEOF 192.168.2.235(master) 6379 >> $LOGFILE 2>&1 sleep 10 #延迟10秒以后待数据同步完成后再取消同步状态 echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE $REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1 vim /etc/keepalived/scripts/redis_backup.sh #!/bin/bash REDISCLI="/opt/redis/bin/redis-cli" LOGFILE="/var/log/keepalived-redis-state.log" echo "[backup]" >> $LOGFILE date >> $LOGFILE echo "Being slave...." >> $LOGFILE 2>&1 sleep 15 #延迟15秒待数据被对方同步完成之后再切换主从角色 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI SLAVEOF 192.168.2.235 6379 >> $LOGFILE 2>&1 以下脚本分别在master和slave上创建 mkdir /etc/keepalived/scripts vim /etc/keepalived/scripts/redis_check.sh #!/bin/bash ALIVE=`/opt/redis/bin/redis-cli PING` if [ "$ALIVE" == "PONG" ]; then echo $ALIVE exit 0 else echo $ALIVE exit 1 fi vim /etc/keepalived/scripts/redis_fault.sh #!/bin/bash LOGFILE=/var/log/keepalived-redis-state.log echo "[fault]" >> $LOGFILE date >> $LOGFILE vim /etc/keepalived/scripts/redis_stop.sh #!/bin/bash LOGFILE=/var/log/keepalived-redis-state.log echo "[stop]" >> $LOGFILE date >> $LOGFILE 授执行权 chmod +x /etc/keepalived/scripts/*.sh 四．测试 在msater和slave上分别启动redis； /etc/init.d/redis start 分别启动keepalived /etc/init.d/keepalived start
在master上执行 ip a 虚拟IP已经绑定了 在master上执行/etc/init.d/redis stop 查看slave 看到了吧秒级切换。 接下来再吧master上的redis启动起来又切换回来了。 测试redis同步
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