两台redis + keepalived主备

1 redis安装、 keepalived安装

2 keepalived配置
master:
/etc/keepalived/keepalived.conf
############
! Configuration File for keepalived
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 110 ###权重值
authentication {
auth_type PASS ###加密
auth_pass 7IB8LAW3RB ###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
}

redis_check.sh
#############
#!/bin/bash
PORT="6379"
REQUIREPASS="password"

ALIVE=`/usr/local/redis/bin/redis-cli -p $PORT -a $REQUIREPASS PING`
if [ "$ALIVE" == "PONG" ]; then
echo $ALIVE
exit 0
else
echo $ALIVE
exit 1
fi

#########
/etc/keepalived/scripts/下创建脚本(注意脚本要有可执行权限)：
redis_master.sh
###############
#!/bin/bash

REDISCLI="/usr/local/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 -p 6379 -a admin SLAVEOF 192.168.2.82 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 -p 6379 -a admin SLAVEOF NO ONE >> $LOGFILE 2>&1
########

redis_backup.sh
########
#!/bin/bash

REDISCLI="/usr/local/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 -p 6379 -a admin SLAVEOF 192.168.2.82 6379 >> $LOGFILE 2>&1
########
192.168.2.82从机IP

redis_fault.sh
######
#!/bin/bash

LOGFILE=/var/log/keepalived-redis-state.log

echo "[fault]" >> $LOGFILE
date >> $LOGFILE
#####

redis_stop.sh
####
#!/bin/bash

LOGFILE=/var/log/keepalived-redis-state.log

echo "[fault]" >> $LOGFILE
date >> $LOGFILE
####

backup:
/etc/keepalived/keepalived.conf
##########
! Configuration File for keepalived
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 7IB8LAW3RB ###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
}

/etc/keepalived/scripts/下创建脚本：
redis_master.sh
####

#!/bin/bash

REDISCLI="/usr/local/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 -h 192.168.2.82 -p 6379 -a admin SLAVEOF NO ONE
$REDISCLI -p 6379 -a admin SLAVEOF 192.168.2.81 6379
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 -p 6379 -a admin SLAVEOF NO ONE >> $LOGFILE 2>&1
####
192.168.2.81为masterIP

redis_backup.sh
#####
#!/bin/bash

REDISCLI="/usr/local/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 -h 192.168.2.81 -p 6379 -a admin >> $LOGFILE 2>&1
$REDISCLI -h 192.168.2.82 -p 6379 -a admin slaveof 192.168.2.81 6379
####

redis_fault.sh
####
#!/bin/bash

LOGFILE=/var/log/keepalived-redis-state.log

echo "[fault]" >> $LOGFILE
date >> $LOGFILE
####

redis_stop.sh
####
#!/bin/bash

LOGFILE=/var/log/keepalived-redis-state.log

echo "[stop]" >> $LOGFILE
date >> $LOGFILE
####