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
原文地址:https://www.cnblogs.com/adam19/p/11535983.html
时间: 2024-10-28 16:13:06