首页 / 数据库 / MySQL / CentOS下Redis高可用安装过程

CentOS下Redis高可用安装过程

[x] 安装环境介绍:

Master: T1
Slave: T2
VIP: 192.168.68.45

---

[x] 安装Redis（Master,Slave）

注意: 安装redis前flushall的修改

查找src/redis.c文件,把 `{"flushdb",flushdbCommand,1,"w",0,NULL,0,0,0,0,0},` `{"flushall",flushallCommand,1,"w",0,NULL,0,0,0,0,0},` 修改成: `{"xflushdb",flushdbCommand,1,"w",0,NULL,0,0,0,0,0},` `{"xflushall",flushallCommand,1,"w",0,NULL,0,0,0,0,0},`

vi /etc/sysctl.conf添加一行: `vm.overcommit_memory=1`mkdir /opt/redismkdir /opt/redis/logmkdir /opt/redis/dbtar zxvf ./redis-2.8.17.tar.gzcd redis-2.8.17make PREFIX=/opt/redis install

[x] Redis启动脚本（Master,Slave）:/opt/redis/bin/startRedis.sh

#！/bin/bashbasedir=`dirname $0`echo "Redis BASE DIR:$basedir"cd $basedirnohup ./redis-server ./redis.conf > /dev/null 2>&1 &

[x] Redis停止脚本（Master,Slave）:/opt/redis/bin/StopRedis.sh

#！/bin/shbasedir=`dirname $0`echo "Redis BASE DIR:$basedir"cd $basedir./redis-cli -h localhost -a 123456 shutdown

[x] Redis配置文件（Master,Slave）:/opt/redis/bin/redis.conf

#requirepass 123456pidfile /opt/redis/bin/redis.pidlogfile /opt/redis/log/redis.logdir /opt/redis/db/daemonize yesport 6379timeout 300loglevel warningdatabases 16maxmemory 1g#不要快照#save 900 1#save 300 10#save 60 10000#rdbcompression yes#dbfilename dump.rdb#使用AOFappendonly yesappendfsync everysec

[x] 安装Keepalived（Master,Slave）:

#wget http://www.keepalived.org/software/keepalived-1.2.13.tar.gztar zxvf keepalived-1.2.13.tar.gzcd ./keepalived-1.2.13./configuremake make installcp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/cp /usr/local/sbin/keepalived /usr/sbin/mkdir /etc/keepalivedcp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/chkconfig --add keepalived#chkconfig --level 35 keepalived on#service keepalived start

[x] notify_*解释

Keepalived在转换状态时会依照状态来呼叫：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（track_script,track_interface失败）进入Fault状态呼叫notify_fault当Keepalived程序终止时则呼叫notify_stop

[x] 在Master上创建如下配置文件：

vim /etc/keepalived/keepalived.conf！ Configuration File for keepalivedglobal_defs { notification_email { root@localhost } notification_email_from root@localhost smtp_server localhost smtp_connect_timeout 30 router_id LVS_REDIS}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 {nopreempt ###不抢占,防止脑裂state MASTER #备的是BACKUPinterface br0virtual_router_id 51priority 100#备的是90advert_int 1authentication {auth_type PASSauth_pass redis}virtual_ipaddress {192.168.68.45}track_script {chk_redis ###执行上面定义的chk_redis}notify_master /etc/keepalived/scripts/redis_master.shnotify_backup /etc/keepalived/scripts/redis_backup.shnotify_fault/etc/keepalived/scripts/redis_fault.shnotify_stop /etc/keepalived/scripts/redis_stop.sh}

[x] 在Slave上创建如下配置文件：

vim /etc/keepalived/keepalived.conf！ Configuration File for keepalivedglobal_defs { notification_email { root@localhost } notification_email_from root@localhost smtp_server localhost smtp_connect_timeout 30 router_id LVS_REDIS}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 {nopreempt ###不抢占,防止脑裂state BACKUP #备的是BACKUPinterface br0virtual_router_id 51priority 90#备的是90advert_int 1authentication {auth_type PASSauth_pass redis}virtual_ipaddress {192.168.68.45}track_script {chk_redis ###执行上面定义的chk_redis}notify_master /etc/keepalived/scripts/redis_master.shnotify_backup /etc/keepalived/scripts/redis_backup.shnotify_fault/etc/keepalived/scripts/redis_fault.shnotify_stop /etc/keepalived/scripts/redis_stop.sh}

[x] 在Master和Slave上创建监控Redis的脚本:

mkdir /etc/keepalived/scripts/
vi /etc/keepalived/scripts/redis_check.sh#！/bin/bashC_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`ALIVE=`/opt/redis/bin/redis-cli PING`if [ "$ALIVE" == "PONG" ]; thenecho "${C_DATE} $ALIVE"exit 0elseecho "${C_DATE} $ALIVE"exit 1fi

[x] 在Master与Slave创建如下脚本notify_fault和notify_stop：

vim /etc/keepalived/scripts/redis_fault.sh#！/bin/bashC_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`LOGFILE=/var/log/keepalived-redis-state.logecho "${C_DATE} [fault]" >> $LOGFILEvim /etc/keepalived/scripts/redis_stop.sh#！/bin/bashC_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`LOGFILE=/var/log/keepalived-redis-state.logecho "${C_DATE} [stop]" >> $LOGFILE

[x] 在Master上创建notity_master与notify_backup脚本:

vim /etc/keepalived/scripts/redis_master.sh#！/bin/bashC_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`REDISCLI="/opt/redis/bin/redis-cli"LOGFILE="/var/log/keepalived-redis-state.log"echo "${C_DATE} [master]" >> $LOGFILE#当keepalived配置为"抢占式"时,打开下面注释#echo "Being master...." >> $LOGFILE 2>&1#echo "Run SLAVEOF cmd ..." >> $LOGFILE#$REDISCLI SLAVEOF T2 6379 >> $LOGFILE2>&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 SLAVEOF NO ONE >> $LOGFILE 2>&1vim /etc/keepalived/scripts/redis_backup.sh#！/bin/bashC_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`REDISCLI="/opt/redis/bin/redis-cli"LOGFILE="/var/log/keepalived-redis-state.log"echo "${C_DATE} [backup]" >> $LOGFILE#当keepalived配置为"抢占式"时,打开下面注释#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 T2 6379 >> $LOGFILE2>&1

[x] 在Slave上创建notity_master与notify_backup脚本:

vim /etc/keepalived/scripts/redis_master.sh#！/bin/bashC_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`REDISCLI="/opt/redis/bin/redis-cli"LOGFILE="/var/log/keepalived-redis-state.log"echo "${C_DATE} [master]" >> $LOGFILE#当keepalived配置为"抢占式"时,打开下面注释#echo "Being master...." >> $LOGFILE 2>&1#echo "Run SLAVEOF cmd ..." >> $LOGFILE#$REDISCLI SLAVEOF T1 6379 >> $LOGFILE2>&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 SLAVEOF NO ONE >> $LOGFILE 2>&1vim /etc/keepalived/scripts/redis_backup.sh#！/bin/bashC_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`REDISCLI="/opt/redis/bin/redis-cli"LOGFILE="/var/log/keepalived-redis-state.log"echo "${C_DATE} [backup]" >> $LOGFILE#当keepalived配置为"抢占式"时,打开下面注释#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 T1 6379 >> $LOGFILE2>&1

[x] 在Master和Slave上,给监控脚本都加上可执行权限：

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

[x] 启动步骤:

1. 启动Master上的Redis
   /opt/redis/bin/startRedis.sh
2. 启动Slave上的Redis
   /opt/redis/bin/startRedis.sh
3. 启动Master上的Keepalived
   service keepalived start
4. 启动Slave上的Keepalived
   service keepalived start

下面关于Redis的文章您也可能喜欢，不妨参考下：Ubuntu 14.04下Redis安装及简单测试 http://www.linuxidc.com/Linux/2014-05/101544.htmRedis主从复制基本配置 http://www.linuxidc.com/Linux/2015-03/115610.htmRedis集群明细文档 http://www.linuxidc.com/Linux/2013-09/90118.htmUbuntu 12.10下安装Redis（图文详解）+ Jedis连接Redis http://www.linuxidc.com/Linux/2013-06/85816.htmRedis系列-安装部署维护篇 http://www.linuxidc.com/Linux/2012-12/75627.htmCentOS 6.3安装Redis http://www.linuxidc.com/Linux/2012-12/75314.htmRedis安装部署学习笔记 http://www.linuxidc.com/Linux/2014-07/104306.htmRedis配置文件redis.conf 详解 http://www.linuxidc.com/Linux/2013-11/92524.htmRedis 的详细介绍：请点这里
Redis 的下载地址：请点这里本文永久更新链接地址