1:redis主从环境,均未开启持久化;
持久化需要配置在主实例上才能跨越实例保证数据不丢失,当主实例宕机威尼斯人平台。当主实例宕机,从实例上的数据不受影响;
当主恢复后,主实例上的数据将会继续同步到从实例,即原来的值将变为空值;

Redis主从架构持久化存在一个问题,即前次测试的结论,持久化需要配置在主实例上才能跨越实例保证数据不丢失,这样以来主实例在持久化数据到硬
盘的过程中,势必会造成磁盘的I/O等待,经过实际测试,这个持久化写硬盘的过程给应用程序带来的影响无法忍受;因而在大多数场景下,会考虑把持久化配置
在从实例上,当主实例宕机后,通过手动或者自动的方式将从实例提升为主实例,继续提供服务!当主实例恢复后,先从原从实例上同步数据,同步完成后再恢复到
原始的主从状态!要实现这种的要求,需要有keepalive的配合,一方面keepalive提供了VIP,可以避免修改应用程序连接,同时redis
实例的配置文件监听部分也需要修改为全网监听;另一方面keepalive定时调度脚本来监控主从实例的状态,根据具体情况进行切换!本文将重点介绍下使
用keepalive实现redis主从自动failover!

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 info |grep -A 3 ‘Replication’
# Replication
role:master
connected_slaves:1
slave0:192.168.1.113,6379,online
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123
redis 192.168.1.112:6379> set 1 a
OK
redis 192.168.1.112:6379> get 1
"a"
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 shutdown
[root@server12 ~]# tail -f /var/log/messages
Dec 3 15:27:34 server12 redis[32151]: Connecting to MASTER…
Dec 3 15:27:34 server12 redis[32151]: MASTER <-> SLAVE sync started
Dec 3 15:27:34 server12 redis[32151]: Error condition on socket for SYNC: Connection refused
[root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123
redis 192.168.1.113:6379> get 1
"a"
[root@server11 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123
redis 192.168.1.112:6379> get 1
(nil)
redis 192.168.1.112:6379> exit
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123
redis 192.168.1.113:6379> get 1
(nil)

环境介绍
操作系统版本均为:rhel5.4 64bit
redis版本:2.6.4
redis实例端口均为:6379
redis实例密码均为:123
VIP:192.168.1.120
主实例为server11(192.168.1.112)
从实例为server12(192.168.1.113,开启快照持久化)

2:redis主从环境,从实例开启快照持久化
当主实例宕机,从实例上的数据不受影响;
当主恢复后,主实例上的数据将会继续同步到从实例,即原来的值将变为空值;

一:安装keepalive软件,server11安装完成后直接scp至server12上即可

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123
redis 192.168.1.112:6379> get 1
(nil)
redis 192.168.1.112:6379> set 1 a
OK
redis 192.168.1.112:6379> set 2 b
OK
redis 192.168.1.112:6379> exit
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 shutdown
[root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123
redis 192.168.1.113:6379> get 1
"a"
redis 192.168.1.113:6379> get 2
"b"
redis 192.168.1.113:6379> exit

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123
redis 192.168.1.112:6379> get 1
(nil)
redis 192.168.1.112:6379> get 2
(nil)
redis 192.168.1.112:6379> exit
[root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123
redis 192.168.1.113:6379> get 1
(nil)
redis 192.168.1.113:6379> get 2
(nil)
redis 192.168.1.113:6379> exit
    [root@server11 ~]# wget http://keepalived.org/software/keepalived-1.1.19.tar.gz  
    [root@server11 ~]# tar -zxvf ../tarbag/keepalived-1.1.19.tar.gz  
    [root@server11 ~]# cd keepalived-1.1.19/  
    [root@server11 ~]# ./configure --prefix=/usr/local/keepalived && make && make install

 

二:配置主节点server11配置文件

3:推进一层,当主,从实例均宕机的情况下会如何呢?

    [root@server11 ~]# cat /usr/local/keepalived/etc/keepalived/keepalived.conf  
    ! Configuration File for keepalived  

    global_defs {  
     router_id LVS_DEVEL  
    }  

    vrrp_script Monitor_redis {  
     script "/usr/local/scripts/redis_monitor.sh"  
     interval 2   
     weight 2    
    }  

    vrrp_instance VI_1{   
     state MASTER  
     interface eth0  
     virtual_router_id 51  
     mcast_src_ip 192.168.1.112  
     priority  100  
     advert_int 1  
     authentication {  
     auth_type PASS  
     auth_pass password_123  
    }  
     track_script {  
     Monitor_redis  
    }  
     virtual_ipaddress {  
     192.168.1.120  
     }  
     notify_fault  /usr/local/scripts/redis_fault.sh    
     notify_stop   /usr/local/scripts/redis_stop.sh    

    } 
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123
redis 192.168.1.112:6379> set 1 a
OK
redis 192.168.1.112:6379> set 2 b
OK
redis 192.168.1.112:6379> set 3 c
OK
redis 192.168.1.112:6379> exit
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123
redis 192.168.1.113:6379> get 1
"a"
redis 192.168.1.113:6379> get 2
"b"
redis 192.168.1.113:6379> get 3
"c"
redis 192.168.1.113:6379> exit

这次先关闭从实例,再关闭主实例!启动则先启动从实例,测试数据;再启动主实例,再测试数据!
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 shutdown
[root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123 shutdown
[root@server12 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123
redis 192.168.1.113:6379> get 1
"a"
redis 192.168.1.113:6379> get 2
"b"
redis 192.168.1.113:6379> get 3
"c"

[root@server11 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123
redis 192.168.1.112:6379> get 1
(nil)
redis 192.168.1.112:6379> get 2
(nil)
redis 192.168.1.112:6379> get 3
(nil)
redis 192.168.1.112:6379> exit

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123
redis 192.168.1.113:6379> get 1
(nil)
redis 192.168.1.113:6379> get 2
(nil)
redis 192.168.1.113:6379> get 3
(nil)
redis 192.168.1.113:6379> exit

三:配置从节点server12配置文件

实践证明,在redis主从读写分离条件下,快照持久化只有开在主实例侧才可以保证数据可以跨越实例重启!

    [root@server12 ~]# cat /usr/local/keepalived/etc/keepalived/keepalived.conf  
    ! Configuration File for keepalived  

    global_defs {  
     router_id LVS_DEVEL  
    }  

    vrrp_script Monitor_redis {  
     script "/usr/local/scripts/redis_monitor.sh"  
     interval 2   
     weight 2    
    }  

    vrrp_instance VI_1{   
     state BACKUP   
     interface eth0  
     virtual_router_id 51  
     mcast_src_ip 192.168.1.113  
     priority  99  
     advert_int 1  
     authentication {  
     auth_type PASS  
     auth_pass password_123  
    }  
     track_script {  
     Monitor_redis  
    }  
     virtual_ipaddress {  
     192.168.1.120  
     }  
     notify_master /usr/local/scripts/redis_master.sh    
     notify_backup /usr/local/scripts/redis_backup.sh    
     notify_fault  /usr/local/scripts/redis_fault.sh    
     notify_stop   /usr/local/scripts/redis_stop.sh    

    } 
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123
redis 192.168.1.112:6379> set 1 a
OK
redis 192.168.1.112:6379> set 2 b
OK
redis 192.168.1.112:6379> set 3 c
OK
redis 192.168.1.112:6379> set 4 d
OK
redis 192.168.1.112:6379> exit
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123
redis 192.168.1.113:6379> get 4
"d"
redis 192.168.1.113:6379> exit

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 shutdown
[root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123 shutdown
[root@server11 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf
[root@server12 ~]# /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.112 -a 123 get 4
"d"
[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123 get 4
"d"

四:准备相关的脚本,主从实例上都需要存在这些脚本,同时注意脚本需要由可执行权限

威尼斯人平台 1

    [root@server11 ~]# cat /usr/local/scripts/redis_monitor.sh   
    #!/bin/bash    
    ALIVE=$(/usr/local/redis2/bin/redis-cli -h 192.168.1.112 -p 6379 -a 123 PING)  

    if [ "$ALIVE" == "PONG" ]; then   
        echo $ALIVE    
        exit 0    
        else   
        echo $ALIVE    
        killall -9 keepalived  
        service network restart  
        exit 1    
    fi   

    [root@server11 ~]# sh /usr/local/scripts/redis_monitor.sh   
    PONG  

    [root@server11 ~]# cat /usr/local/scripts/redis_master.sh    
    #!/bin/bash    
    REDISCLI="/usr/local/redis2/bin/redis-cli -h 192.168.1.112 -p 6379 -a 123"   
    LOGFILE="/usr/local/redis2/var/keepalived-redis-state.log"   

    echo "[master]" >> $LOGFILE    
    date >> $LOGFILE    
    echo "Being master...." >> $LOGFILE 2>&1    
    echo "Run SLAVEOF cmd ..." >> $LOGFILE    
    $REDISCLI SLAVEOF 192.168.1.113 6379 >> $LOGFILE  2>&1    
    sleep 10   
    echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE    
    $REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1   


    [root@server11 ~]# cat /usr/local/scripts/redis_backup.sh   
    #!/bin/bash    
    REDISCLI="/usr/local/redis2/bin/redis-cli -h 192.168.1.112 -p 6379 -a 123"   
    LOGFILE="/usr/local/redis2/var/keepalived-redis-state.log"   

    echo "[backup]" >> $LOGFILE    
    date >> $LOGFILE    
    echo "Being slave...." >> $LOGFILE 2>&1    
    sleep 15    
    echo "Run SLAVEOF cmd ..." >> $LOGFILE    
    $REDISCLI SLAVEOF 192.168.1.113 6379 >> $LOGFILE  2>&1   

    [root@server11 ~]# cat /usr/local/scripts/redis_stop.sh   
    #!/bin/bash  
    LOGFILE="/usr/local/redis2/var/keepalived-redis-state.log"   
    echo "[stop]" >> $LOGFILE  
    date >> $LOGFILE   
    [root@server11 ~]# cat /usr/local/scripts/redis_fault.sh 
    #!/bin/bash  
    LOGFILE="/usr/local/redis2/var/keepalived-redis-state.log" 
    echo "[fault]" >> $LOGFILE  
    date >> $LOGFILE 

五:主从实例分别启动keepalive进程,测试VIP是否正常(这里就要修改redis配置文件的监听地址为0.0.0.0)

[root@server11 ~]# /usr/local/keepalived/sbin/keepalived -D -f  /usr/local/keepalived/etc/keepalived/keepalived.conf  
[root@server11 ~]# tail -f /var/log/messages  
Dec 12 09:25:49 server11 Keepalived_healthcheckers[7710]: Configuration is using : 5499 Bytes  
Dec 12 09:25:49 server11 Keepalived_healthcheckers[7710]: Using LinkWatch kernel netlink reflector...  
Dec 12 09:25:49 server11 Keepalived_vrrp[7712]: VRRP sockpool: [ifindex(2), proto(112), fd(12,13)]  
Dec 12 09:25:49 server11 Keepalived_vrrp[7712]: VRRP_Script(Monitor_redis) succeeded  
Dec 12 09:25:50 server11 Keepalived_vrrp[7712]: VRRP_Instance(VI_1{) Transition to MASTER STATE  
Dec 12 09:25:51 server11 Keepalived_vrrp[7712]: VRRP_Instance(VI_1{) Entering MASTER STATE  
Dec 12 09:25:51 server11 Keepalived_vrrp[7712]: VRRP_Instance(VI_1{) setting protocol VIPs.  
Dec 12 09:25:51 server11 Keepalived_vrrp[7712]: VRRP_Instance(VI_1{) Sending gratuitous ARPs on eth0 for 192.168.1.120  
Dec 12 09:25:51 server11 avahi-daemon[4519]: Registering new address record for 192.168.1.120 on eth0.  
Dec 12 09:25:51 server11 Keepalived_healthcheckers[7710]: Netlink reflector reports IP 192.168.1.120 added  
Dec 12 09:25:51 server11 Keepalived_vrrp[7712]: Netlink reflector reports IP 192.168.1.120 added  
Dec 12 09:25:56 server11 Keepalived_vrrp[7712]: VRRP_Instance(VI_1{) Sending gratuitous ARPs on eth0 for 192.168.1.120  

[root@server11 ~]# ip a |grep 192  
    inet 192.168.1.112/24 brd 192.168.1.255 scope global eth0  
    inet 192.168.1.120/32 scope global eth0  

[root@server12 ~]# /usr/local/keepalived/sbin/keepalived -D -f /usr/local/keepalived/etc/keepalived/keepalived.conf  
[root@server12 ~]# tail -f /var/log/messages  
Dec 12 09:26:55 server12 Keepalived_healthcheckers[3106]: Configuration is using : 5595 Bytes  
Dec 12 09:26:55 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Entering BACKUP STATE  
Dec 12 09:26:55 server12 Keepalived_healthcheckers[3106]: Using LinkWatch kernel netlink reflector...  
Dec 12 09:26:55 server12 Keepalived_vrrp[3108]: VRRP sockpool: [ifindex(2), proto(112), fd(12,13)]  
Dec 12 09:26:55 server12 Keepalived_vrrp[3108]: VRRP_Script(Monitor_redis) succeeded  

[root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.120 -a 123 info |grep -A 3 'Replication'  
# Replication  
role:master  
connected_slaves:1  
slave0:192.168.1.113,6379,online

六:主实例写入测试数据,该脚本原则上会写入25条测试数据,不过由于未优化redis默认并发数,会导致一些写入请求失败,最终功写入231839条测
试数据,占内存总大小为25M左右,写入过程中可以观察主从实例的持久化文件变化情况,主实例的持久化文件维持在30k,从实例的则不断的扩展!

    [root@server11 ~]# cat test.sh   
    #!/bin/bash    
    REDISCLI="/usr/local/redis2/bin/redis-cli -h 192.168.1.120 -a 123 -n 1 SET"   
    ID=1    
    while(($ID<50001))    
    do   
    INSTANCE_NAME="i-2-$ID-VM"   
    UUID=`cat /proc/sys/kernel/random/uuid`    
    PRIVATE_IP_ADDRESS=10.`echo "$RANDOM % 255 + 1" | bc`.`echo "$RANDOM % 255 + 1" | bc`.`echo   

    "$RANDOM % 255 + 1" | bc`    
    CREATED=`date "+%Y-%m-%d %H:%M:%S"`    
    $REDISCLI vm_instance:$ID:instance_name "$INSTANCE_NAME"   
    $REDISCLI vm_instance:$ID:uuid "$UUID"   
    $REDISCLI vm_instance:$ID:private_ip_address "$PRIVATE_IP_ADDRESS"   
    $REDISCLI vm_instance:$ID:created "$CREATED"   
    $REDISCLI vm_instance:$INSTANCE_NAME:id "$ID"   
    ID=$(($ID+1))    
    done   

    [root@server11 ~]# sh test.sh   
    [root@server11 redis2]# /usr/local/redis2/bin/redis-cli -h 192.168.1.120 -a 123 info |egrep   

    'used_memory_peak_human|db1:keys'  
    used_memory_peak_human:24.98M  
    db1:keys=231839,expires=0 

七:模拟主实例故障,观察日志输出,验证从实例是否能成功接管VIP,同时将实例变成读写模式

    [root@server11 ~]# killall -9  redis-server  
    [root@server11 ~]# ip a |grep 192  
        inet 192.168.1.112/24 brd 192.168.1.255 scope global eth0  

    [root@server11 ~]# ps -ef |grep redis  
    root     15886  6458  0 09:49 pts/0    00:00:00 grep redis  
    [root@server11 ~]# ps -ef |grep keep  
    root     16029  6458  0 09:49 pts/0    00:00:00 grep keep  


    [root@server12 ~]# tail -f /usr/local/redis2/var/keepalived-redis-state.log   
    [master]  
    Wed Dec 12 09:48:52 CST 2012  
    Being master....  
    Run SLAVEOF cmd ...  
    OK Already connected to specified master  
    Run SLAVEOF NO ONE cmd ...  
    OK  

    [root@server12 ~]# tail -f /var/log/messages  
    Dec 12 09:48:51 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Transition to MASTER STATE  
    Dec 12 09:48:52 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Entering MASTER STATE  
    Dec 12 09:48:52 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) setting protocol VIPs.  
    Dec 12 09:48:52 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Sending gratuitous ARPs on eth0 for 192.168.1.120  
    Dec 12 09:48:52 server12 Keepalived_vrrp[3108]: Netlink reflector reports IP 192.168.1.120 added  
    Dec 12 09:48:52 server12 avahi-daemon[2921]: Registering new address record for 192.168.1.120 on eth0.  
    Dec 12 09:48:52 server12 Keepalived_healthcheckers[3106]: Netlink reflector reports IP 192.168.1.120 added  
    Dec 12 09:48:57 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Sending gratuitous ARPs on eth0 for 192.168.1.120  

    [root@server12 ~]# ip a |grep 192  
        inet 192.168.1.113/24 brd 192.168.1.255 scope global eth0  
        inet 192.168.1.120/32 scope global eth0  

    [root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.120 -a 123 info |grep -A 3 'Replication'  
    # Replication  
    role:master  
    connected_slaves:0 

    [root@server12 ~]# sh test.sh  
    [root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.120 -a 123 info |egrep   

    'used_memory_peak_human|db1:keys'  
    used_memory_peak_human:26.78M  
    db1:keys=249925,expires=0 

九:主实例角色的恢复过程,使用shell脚本自动恢复

    [root@server11 ~]# ssh-keygen   
    [root@server11 ~]# cd .ssh/  
    [root@server11 .ssh]# ssh-copy-id -i id_rsa.pub root@192.168.1.113  
    [root@server11 ~]# cat /usr/local/scripts/recover_mastart.sh   
    #!/bin/sh  
    ALIVE=$(/usr/local/redis2/bin/redis-cli -h 192.168.1.113 -p 6379 -a 123 PING)  
    MDB=/usr/local/redis2/master_dump.rdb  
    SDB=/usr/local/redis2/slave_dump.rdb  

    if [ "$ALIVE" == "PONG" ]; then   
        echo $ALIVE    
        scp root@192.168.1.113:$SDB  $MDB  
        else   
        echo $ALIVE   
        exit 1    
    fi   

    /usr/local/redis2/bin/redis-server /usr/local/redis2/etc/redis.conf  
    /usr/local/keepalived/sbin/keepalived -D -f    

    /usr/local/keepalived/etc/keepalived/keepalived.conf  

    [root@server11 ~]# chmod +x  /usr/local/scripts/recover_mastart.sh   
    [root@server11 ~]# sh /usr/local/scripts/recover_mastart.sh  

十:验证数据完整性和主从角色恢复情况

    [root@server11 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.120 -a 123 info |egrep 'used_memory_peak_human|db1:keys'  
    used_memory_peak_human:26.78M  
    db1:keys=249925,expires=0 

    [root@server11 ~]#  /usr/local/redis2/bin/redis-cli -h 192.168.1.120 -a 123 info |grep -A 3 'Replication'  
    # Replication  
    role:master  
    connected_slaves:1  
    slave0:192.168.1.113,6379,online  

    [root@server12 ~]#  /usr/local/redis2/bin/redis-cli -h 192.168.1.113 -a 123 info |grep -A 3 'Replication'  
    # Replication  
    role:slave  
    master_host:192.168.1.112  
    master_port:6379  

    [root@server12 ~]# /usr/local/redis2/bin/redis-cli -h 192.168.1.120 -a 123 info |egrep 'used_memory_peak_human|db1:keys'  
    used_memory_peak_human:26.78M  
    db1:keys=249925,expires=0 

    主实例keepalive日志:  
    [root@server11 ~]# tail -f /var/log/messages  
    Dec 12 10:08:13 server11 Keepalived_vrrp[20231]: VRRP sockpool: [ifindex(2), proto(112), fd(11,12)]  
    Dec 12 10:08:13 server11 Keepalived_vrrp[20231]: VRRP_Script(Monitor_redis) succeeded  
    Dec 12 10:08:13 server11 Keepalived_vrrp[20231]: VRRP_Instance(VI_1{) Transition to MASTER STATE  
    Dec 12 10:08:13 server11 Keepalived_vrrp[20231]: VRRP_Instance(VI_1{) Received higher prio advert  
    Dec 12 10:08:13 server11 Keepalived_vrrp[20231]: VRRP_Instance(VI_1{) Entering BACKUP STATE  
    Dec 12 10:08:15 server11 Keepalived_vrrp[20231]: VRRP_Instance(VI_1{) forcing a new MASTER election  
    Dec 12 10:08:16 server11 Keepalived_vrrp[20231]: VRRP_Instance(VI_1{) Transition to MASTER STATE  
    Dec 12 10:08:17 server11 Keepalived_vrrp[20231]: VRRP_Instance(VI_1{) Entering MASTER STATE  
    Dec 12 10:08:17 server11 Keepalived_vrrp[20231]: VRRP_Instance(VI_1{) setting protocol VIPs.  
    Dec 12 10:08:17 server11 Keepalived_healthcheckers[20230]: Netlink reflector reports IP 192.168.1.120 added  
    Dec 12 10:08:17 server11 Keepalived_vrrp[20231]: VRRP_Instance(VI_1{) Sending gratuitous ARPs on eth0 for 192.168.1.120  
    Dec 12 10:08:17 server11 Keepalived_vrrp[20231]: Netlink reflector reports IP 192.168.1.120 added  
    Dec 12 10:08:17 server11 avahi-daemon[4519]: Registering new address record for 192.168.1.120 on eth0.  

    [root@server11 ~]# ip a |grep 192  
        inet 192.168.1.112/24 brd 192.168.1.255 scope global eth0  
        inet 192.168.1.120/32 scope global eth0  

    从实例keepalive日志:  
    [root@server12 ~]# tail -f /var/log/messages  
    Dec 12 09:56:01 server12 last message repeated 4 times  
    Dec 12 10:08:13 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Received lower prio advert, forcing new election  
    Dec 12 10:08:13 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Sending gratuitous ARPs on eth0 for 192.168.1.120  
    Dec 12 10:08:15 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Received higher prio advert  
    Dec 12 10:08:15 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) Entering BACKUP STATE  
    Dec 12 10:08:15 server12 Keepalived_vrrp[3108]: VRRP_Instance(VI_1{) removing protocol VIPs.  
    Dec 12 10:08:15 server12 Keepalived_healthcheckers[3106]: Netlink reflector reports IP 192.168.1.120 removed  
    Dec 12 10:08:15 server12 Keepalived_vrrp[3108]: Netlink reflector reports IP 192.168.1.120 removed  
    Dec 12 10:08:15 server12 avahi-daemon[2921]: Withdrawing address record for 192.168.1.120 on eth0.  

    从实例角色转换日志:  
    [root@server12 ~]# tail -f /usr/local/redis2/var/keepalived-redis-state.log   
    [backup]  
    Wed Dec 12 10:08:15 CST 2012  
    Being slave....  
    Run SLAVEOF cmd ...  
    OK 

 

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