redis keepalive+redis 主从高可用
Posted adam19
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1 准备
1.1 准备
keepalived-2.0.18.tar.gz
redis-5.0.4.tar.gz
1.2 说明
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接管服务升级Master，有写权限，同时关闭主从复制功能；
当 Master 恢复正常, Master降级为Slave同步数据，开启主从复制。
1.3 测试服务器信息
Master redis: 192.168.56.103
Slave redis: 192.168.56.104
2. 配置redis 服务
1. 解压缩
tar zxf redis-5.0.4.tar.gz mv redis-5.0.4 /soft/server cd /soft/server mv redis-5.0.4 redis
2. 编译安装
cd /soft/server/redis make && make install
3. redis配置文件修改
vim redis.conf ... bind 0.0.0.0 # 修改支持网络访问 protected-mode no # 同样一个安全配置，默认yes是不能网络访问的 daemonize yes # 后台运行redis slaveof 192.168.56.103 6379 # 指定Master IP，同步（仅从配置）
4. 配置redis服务启动脚本
vim /etc/init.d/redis-server
#!/usr/bin/env bash
#
# redis start up the redis server daemon
#
# chkconfig: 345 99 99
# description: redis service in /etc/init.d/redis
# chkconfig --add redis or chkconfig --list redis
# service redis start or service redis stop
# processname: redis-server
# config: /etc/redis.conf
# 注意不同位置要修改变量
PATH=/usr/local/bin:/sbin:/usr/bin:/bin
REDISPORT=6379
EXEC=/paic/rd6379/bin/redis-server
REDIS_CLI=/paic/rd6379/redis-cli
PIDFILE=/var/run/redis.pid
CONF="/soft/server/redis/redis.conf"
#make sure some dir exist
if [ ! -d /var/lib/redis ] ;then
mkdir -p /var/lib/redis
mkdir -p /var/log/redis
fi
case "$1" in
status)
ps -A|grep redis
;;
start)
if [ -f $PIDFILE ]
then
echo "$PIDFILE exists, process is already running or crashed"
else
echo "Starting Redis server..."
$EXEC $CONF
fi
if [ "$?"="0" ]
then
echo "Redis is running..."
fi
;;
stop)
if [ ! -f $PIDFILE ]
then
echo "$PIDFILE does not exist, process is not running"
else
PID=$(cat $PIDFILE)
echo "Stopping ..."
$REDIS_CLI -p $REDISPORT SHUTDOWN
while [ -x $PIDFILE ]
do
echo "Waiting for Redis to shutdown ..."
sleep 1
done
echo "Redis stopped"
fi
;;
restart|force-reload)
$0 stop
$0 start
;;
*)
echo "Usage: /etc/init.d/redis start|stop|restart|force-reload" >&2
exit 1
esac
5. 配置开机自启
chkconfig --add redis-server chkconfig redis-server on
配置keepalive服务
1. 编译安装
tar zxf keepalived-1.2.22.tar.gz cd keepalived-1.2.22 ./configure --prefix=/usr/local/keepalived make && make install
2. 配置文件设置
# 拷贝keepalived服务 cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/keepalived cp /usr/local/keepalived/sbin/keepalived /usr/sbin/keepalived # 配置keepalived服务 cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/keepalived mkdir /etc/keepalived # 拷贝配置文件 cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
3. keepalive配置文件
Master节点
! Configuration File for keepalived
vrrp_script chk_redis
script "/root/scripts/redis_check.sh" ###监控脚本
interval 2 ###监控时间
#网卡需要注意，使用ifconfig查看一下当前活动网卡
vrrp_instance VI_1
state BACKUP ###设置为BACKUP
nopreempt # 不抢占MASTER
interface eth0 ###监控网卡
virtual_router_id 51
priority 100 ###权重值
authentication
auth_type PASS ###加密
auth_pass 1q2w3e ###密码
#设置额外的监控，里面的任意一个网卡出现问题，都会进入FAULT状态
track_interface
eth0
track_script
chk_redis ###执行上面定义的chk_redis
virtual_ipaddress
192.168.0.99 ######VIP
notify_master /root/scripts/redis_master.sh
notify_backup /root/scripts/redis_backup.sh
notify_fault /root/scripts/redis_fault.sh
notify_stop /root/scripts/redis_stop.sh
Slave节点
! Configuration File for keepalived
vrrp_script chk_redis
script "/root/scripts/redis_check.sh" ###监控脚本
interval 2 ###监控时间
#同样要注意网卡
vrrp_instance VI_1
state BACKUP ###设置为BACKUP
interface eth0 ###监控网卡
virtual_router_id 51
priority 10 ###比MASTRE权重值低
authentication
auth_type PASS
auth_pass 1q2w3e ###密码与MASTRE相同
#设置额外的监控，里面的任意一个网卡出现问题，都会进入FAULT状态
track_interface
eth0
track_script
chk_redis ###执行上面定义的chk_redis
virtual_ipaddress
192.168.0.99 ####vip
notify_master /root/scripts/redis_master.sh
notify_backup /root/scripts/redis_backup.sh
notify_fault /root/scripts/redis_fault.sh
notify_stop /root/scripts/redis_stop.sh
4. keepalive脚本
# Keepalive 定义的四种状态脚本说明 当进入Master状态时会呼叫notify_master 当进入Backup状态时会呼叫notify_backup 当发现异常情况时进入Fault状态呼叫notify_fault 当Keepalived程序终止时则呼叫notify_stop
redis_check.sh 检测redis是否正常脚本，正常则返回PONG，返回代码0，否则返回代码1
#!/bin/bash ALIVE=`/usr/local/bin/redis-cli PING` if [ "$ALIVE" == "PONG" ]; then echo $ALIVE exit 0 else echo $ALIVE exit 1 fi
redis_master.sh 我被选入Master时，执行的脚本
#!/bin/bash REDISCLI="/usr/local/bin/redis-cli" LOGFILE="/var/log/keepalived-redis-state.log" echo "[master]" >> $LOGFILE date >> $LOGFILE echo "Being master...." >> $LOGFILE 2>&1 echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE $REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1
redis_fault.sh 当检测服务不正常是，执行fault脚本
#!/bin/bash LOGFILE=/var/log/keepalived-redis-state.log echo "[fault]" >> $LOGFILE date >> $LOGFILE
redis_stop.sh keepalive终止时写入日志
#!/bin/bash LOGFILE=/var/log/keepalived-redis-state.log echo "[stop]" >> $LOGFILE date >> $LOGFILE
redis_backup.sh 进入slave时执行的脚本
#!/bin/bash REDISCLI="/usr/local/bin/redis-cli" LOGFILE="/var/log/keepalived-redis-state.log" echo "[backup]" >> $LOGFILE date >> $LOGFILE echo "Being slave...." >> $LOGFILE 2>&1 echo "Run SLAVEOF cmd ..." >> $LOGFILE $REDISCLI SLAVEOF 192.168.0.4 6379 >> $LOGFILE 2>&1 # IP为指定主redis的IP
这里backup 脚本主要说明一下，我的keepalive配置了不去抢占Master，也就是当我Master 宕机后，我master再次起来就是slave，这时就是执行redis_backup的时候了，我去指定我的Master去同步
5. 配置开机自启
chkconfig --add keepalived chkconfig keepalived on
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