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CentOS下Redis高可用安装过程

分类： 大数据

2015-10-22 10:12:28

CentOS下Redis高可用安装过程

[日期：2015-10-21] 来源：Linux社区  作者：Linux [字体：  ]

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/redis mkdir /opt/redis/log mkdir /opt/redis/db tar zxvf ./redis-2.8.17.tar.gz cd redis-2.8.17
make PREFIX=/opt/redis install

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

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

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

#!/bin/sh  basedir=`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 123456 pidfile /opt/redis/bin/redis.pid logfile /opt/redis/log/redis.log dir /opt/redis/db/

daemonize yes
port 6379 timeout 300 loglevel warning
databases 16 maxmemory 1g

#不要快照 #save 900 1 #save 300 10 #save 60 10000 #rdbcompression yes #dbfilename dump.rdb #使用AOF
appendonly yes
appendfsync everysec

[x] 安装Keepalived(Master,Slave): 

#wget http:// tar zxvf keepalived-1.2.13.tar.gz
cd ./keepalived-1.2.13
./configure
make 
make install

cp /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/keepalived
cp /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 keepalived

global_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BACKUP interface br0 virtual_router_id 51 priority 100            #备的是90 advert_int 1 authentication { auth_type PASS
        auth_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.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
}

[x] 在Slave上创建如下配置文件：

vim /etc/keepalived/keepalived.conf 

! Configuration File for keepalived

global_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BACKUP interface br0 virtual_router_id 51 priority 90            #备的是90 advert_int 1 authentication { auth_type PASS
        auth_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.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
}

[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/bash  C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
ALIVE=`/opt/redis/bin/redis-cli PING` if [ "$ALIVE" == "PONG" ]; then echo "${C_DATE} $ALIVE" exit 0 else echo "${C_DATE} $ALIVE" exit 1 fi

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

vim /etc/keepalived/scripts/redis_fault.sh 

#!/bin/bash  C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
LOGFILE=/var/log/keepalived-redis-state.log echo "${C_DATE} [fault]" >> $LOGFILE

vim /etc/keepalived/scripts/redis_stop.sh 

#!/bin/bash  C_DATE=`date +"[%Y-%m-%d %H:%M:%S]"`
LOGFILE=/var/log/keepalived-redis-state.log echo "${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/bash  C_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 >> $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 SLAVEOF NO ONE >> $LOGFILE 2>&1

vim /etc/keepalived/scripts/redis_backup.sh 

#!/bin/bash  C_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 >> $LOGFILE 2>&1

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

vim /etc/keepalived/scripts/redis_master.sh 

#!/bin/bash  C_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 >> $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 SLAVEOF NO ONE >> $LOGFILE 2>&1

vim /etc/keepalived/scripts/redis_backup.sh 

#!/bin/bash  C_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 >> $LOGFILE 2>&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：

 14.04下Redis安装及简单测试 

Redis主从复制基本配置 

Redis集群明细文档 

Ubuntu 12.10下安装Redis（图文详解）+ Jedis连接Redis 

Redis系列-安装部署维护篇 

CentOS 6.3安装Redis 

Redis安装部署学习笔记 

Redis配置文件redis.conf 详解 

Redis 的详细介绍： 
Redis 的下载地址：

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