redis-keepalived高可用

１，版本．均为ｙｕｍ安装．

[[email protected] ~]# redis-server --version
Redis server version 2.4.10 (00000000:0)
[[email protected] ~]# redis-cli --version
redis-cli 2.4.10
[[email protected] ~]# keepalived --version
Keepalived v1.2.13 (03/19,2015)
２，配置文件内容注意事项．

ａ，要实现redis主从复制，从节点配置文件里添加一行slaveof 172.16.226.129(主节点ip) 6379(主节点端口)．

ｂ，keepalived配置文件内容：

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 {
             172.16.226.108                         ###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
}
从节点只需要将权重值设的小一点即可．

３，实现redis主从转换的脚本：

[[email protected] keepalived]# cat scripts/redis_master.sh
#!/bin/bash
 REDISCLI="/usr/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 192.168.241.35 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

[[email protected] keepalived]# cat scripts/redis_check.sh
#!/bin/bash
 ALIVE=`/usr/bin/redis-cli PING`
if [ "$ALIVE" == "PONG" ]; then
  echo $ALIVE
  exit 0
else
  echo $ALIVE
  exit 1
fi

[[email protected] keepalived]# cat scripts/redis_backup.sh
#!/bin/bash
 REDISCLI="/usr/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 192.168.241.35(另外一个节点的ip) 6379 >> $LOGFILE  2>&1

[[email protected] keepalived]# cat scripts/redis_fault.sh
#!/bin/bash
 LOGFILE=/var/log/keepalived-redis-state.log
 echo "[fault]" >> $LOGFILE
date >> $LOGFILE

[[email protected] keepalived]# cat scripts/redis_stop.sh
#!/bin/bash
 LOGFILE=/var/log/keepalived-redis-state.log
echo "[stop]" >> $LOGFILE
date >> $LOGFILE

给脚本以执行权限．

测试：略

远程链接redis: redis-cli -h 172.16.226.108(服务器ip) -p 6379(服务端口)