redis+Keepalived主从热备切换实例

[root@cache-redis-01~/]# cat  /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
   notification_email {
      11270963592@qq.com
   }
   notification_email_from 18978038798@189.cn
   smtp_server smtp.189.cn
   smtp_connect_timeout 30
   router_id redis_service01
   vrrp_skip_check_adv_addr
   # vrrp_strict  # can not use ping 
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}
vrrp_script chk_redis { 
    script /etc/keepalived/scripts/redis_check.sh   ###监控本地redis alive 
    interval 2                                        ###监控时间间隔（秒）
} 
vrrp_instance redis {
    state BACKUP
    interface eth0
    virtual_router_id 55
    priority 100
    nopreempt                                        ###不抢占MASTER
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        chk_redis                       ###执行上面定义的chk_redis
     }
    virtual_ipaddress {
        172.16.1.63/24 dev eth0 label eth0:63
    }
    notify_master /etc/keepalived/scripts/redis_master.sh # 当此节点切换为master时执行的脚本
    notify_backup "/etc/keepalived/scripts/redis_backup.sh cache-redis-02" # 当此节点切换为
                                                          # backup时执行的脚本
    notify_fault  /etc/keepalived/scripts/redis_fault.sh  # 当此节点故障时（chk_keepalive中
                                                          # 脚本返回非0）执行的脚本
    notify_stop   /etc/keepalived/scripts/redis_stop.sh   # 当此节点keepalived服务stop时执行的脚本
}

[root@cache-redis-02~/]# cat /etc/keepalived/keepalived.conf    

! Configuration File for keepalived
global_defs {
   notification_email {
      11270963592@qq.com
   }
   notification_email_from 18978038798@189.cn
   smtp_server smtp.189.cn
   smtp_connect_timeout 30
   router_id redis_service02
   vrrp_skip_check_adv_addr
   # vrrp_strict  # can not use ping 
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}
vrrp_script chk_redis {
    script /etc/keepalived/scripts/redis_check.sh   ###监控本地redis alive 
    interval 2                                        ###监控时间间隔（秒）
}
vrrp_instance redis {
    state BACKUP
    interface eth0
    virtual_router_id 55
    priority 50
    
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script { 
        chk_redis                       ###执行上面定义的chk_redis
    } 
    virtual_ipaddress {
        172.16.1.63/24 dev eth0 label eth0:63
    }
    notify_master /etc/keepalived/scripts/redis_master.sh # 当此节点切换为master时执行的脚本
    notify_backup "/etc/keepalived/scripts/redis_backup.sh cache-redis-01" # 当此节点切换为
                                                          # backup时执行的脚本
    notify_fault  /etc/keepalived/scripts/redis_fault.sh  # 当此节点故障时（chk_keepalive中
                                                          # 脚本返回非0）执行的脚本
    notify_stop   /etc/keepalived/scripts/redis_stop.sh   # 当此节点keepalived服务stop时执行的脚本
}

跟从的脚本完全一样！！！

mkdir -p /etc/keepalived/scripts

cat >/etc/keepalived/scripts/redis_master.sh<<-EOF
    #!/bin/bash
    PORT="${1:-6380}"
    REDISCLI="/bin/redis-cli"
    LOGFILE="/var/log/keepalived-redis-state.log"
    sleep 10 #延迟10秒待数据被对方同步完成之后再切换主从角色
    echo -e "[keepalived master]	$(date +%F_%T)
Run SLAVEOF NO ONE cmd ..." >>${LOGFILE}
    $REDISCLI -h $(hostname) -p ${PORT} SLAVEOF NO ONE &>>${LOGFILE}
EOF

cat >/etc/keepalived/scripts/redis_backup.sh<<-EOF
    #!/bin/bash
    REMOTE_HOSTNAME="$1"
    PORT="${2:-6380}"
    REDISCLI="/bin/redis-cli"
    LOGFILE="/var/log/keepalived-redis-state.log"
    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 -e "[keepalived backup]	$(date +%F_%T)
Run SLAVEOF ${REMOTE_HOSTNAME} ${PORT} ..." >>${LOGFILE}
    $REDISCLI -h $(hostname) -p ${PORT} SLAVEOF ${REMOTE_HOSTNAME} ${PORT} &>>${LOGFILE}
EOF

cat >/etc/keepalived/scripts/redis_check.sh<<-EOF
    #!/bin/bash
    PORT="${1:-6380}"
    LOGFILE=/var/log/keepalived-redis-state.log
    ALIVE=$(/bin/redis-cli -h $(hostname) -p ${PORT} PING)
    if [ "$ALIVE" == "PONG" ]; then
        exit 0
    else
        echo -e "[redis_check fault]	$(date +%F_%T)" >> $LOGFILE
        exit 1
    fi
EOF

cat >/etc/keepalived/scripts/redis_fault.sh<<-EOF
    #!/bin/bash
    systemctl stop keepalived.service
EOF

cat >/etc/keepalived/scripts/redis_stop.sh<<-EOF
    #!/bin/bash
    LOGFILE=/var/log/keepalived-redis-state.log
    echo -e "[keepalived stop]	$(date +%F_%T)" >> $LOGFILE
EOF

chmod +x /etc/keepalived/scripts/*.sh