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  • Redis+Keepalived主从热备秒级切换

    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。

     

    Master 10.10.51.241

    Slave   10.10.51.242

    vip       10.10.51.240

    master配置:

    mkdir –p /etc/keepalived
    vi /etc/keepalived/keepalived.conf
    
    #加入如下内容脚本
    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 { 
                 10.10.51.240                       #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 
    }
    vi /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 10.10.51.242(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
    vi /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 10.10.51.242(slave) 6379 >> $LOGFILE  2>&1

    slave配置

    vi /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 { 
                 10.10.51.240                           #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 
    }
    vi /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 10.10.51.241(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
    vi /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 10.10.51.241(master) 6379 >> $LOGFILE  2>&1

    以下脚本分别在master和slave上创建:

    mkdir /etc/keepalived/scripts
    vi /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
    vi /etc/keepalived/scripts/redis_fault.sh
    
    #!/bin/bash
    LOGFILE=/var/log/keepalived-redis-state.log
    echo "[fault]" >> $LOGFILE
    date >> $LOGFILE
    vi /etc/keepalived/scripts/redis_stop.sh
    
    #!/bin/bash
    LOGFILE=/var/log/keepalived-redis-state.log
    echo "[stop]" >> $LOGFILE
    date >> $LOGFILE
    chmod +x /etc/keepalived/scripts/*.sh    #授权
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  • 原文地址:https://www.cnblogs.com/hunttown/p/5451260.html
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