基于Keepalived对Redis做高可用配置

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基于 Keepalived 对 Redis 做高可用配置

关于 Keepalived 的详细介绍，请移步本人相关文章：http://www.linuxidc.com/Linux/2014-12/110815.htm

一、redis 主从搭建
1.redis 安装

本文通过 yum 源的安装方式来安装（需要配置 epel 源），也可以通过源码编译的方式来安装 

[root@P2Pp_Red01 ~]# yum install -y redis

[root@P2Pp_Red02 ~]# yum install -y redis

2. 修改配置文件

 ①、主 redis 需要修改的文件及内容

[root@P2Pp_Red01 ~]# vi /etc/redis.conf

bind 0.0.0.0

其余都可以安装默认状态

②、从 redis 需要修改的文件及内容

[root@P2Pp_Red02 ~]# vi /etc/redis.conf

bind 0.0.0.0

slaveof 10.13.6.13 6379 // 指定主 redis 的地址与端口

3. 查看主从状态

[root@P2Pp_Red01 ~]# redis-cli INFO |grep role -A 3

role:master

slave0:10.13.6.16,45270,online

db0:keys=6,expires=0

[root@P2Pp_Red02 ~]#  redis-cli INFO |grep role -A 3

role:slave

master_host:10.13.6.13

master_port:6379

master_link_status:up

二、使用 keepalived 对 redis 做高可用

1. 安装 keepalived，两台机器都需要安装

[root@P2Pp_Red01 ~]# yum install -y keepalived

[root@P2Pp_Red02 ~]# yum install -y keepalived

2. 准备配置文件

①、主 redis 的配置文件, 关于各行代表的意思，请移步我的另外一篇文档，链接见文章开头

[root@P2Pp_Red01 scripts]# vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

  notification_email {

    acassen@firewall.loc

    failover@firewall.loc

    sysadmin@firewall.loc

  }

  notification_email_from Alexandre.Cassen@firewall.loc

  smtp_server 10.13.4.17

  smtp_connect_timeout 30

  router_id LVS_DEVEL

}

vrrp_script chk_redis {

    script “killall -0 redis-server”

    interval 2

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id  100

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        10.13.6.17

    }

track_script {

    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

}

~[root@P2Pp_Red01 ~]# vi /etc/keepalived/scripts/redis_master.sh

#!/bin/bash

REDISCLI=”/usr/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 SLAVEOF 10.13.4.13 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

~

[root@P2Pp_Red01 ~]# vi /etc/keepalived/scripts/redis_backup.sh

#!/bin/bash

REDISCLI=”/usr/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 10.13.4.13 6379 >> $LOGFILE  2>&1

[root@P2Pp_Red01 scripts]# vi /etc/keepalived/scripts/redis_stop.sh

#!/bin/bash

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

echo “[stop]” >> $LOGFILE

date >> $LOGFILE

[root@P2Pp_Red01 scripts]# vi /etc/keepalived/scripts/redis_fault.sh

#!/bin/bash

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

echo “[fault]” >> $LOGFILE

date >> $LOGFILE

~

②、准备从 redis 的配置文件

[root@P2Pp_Red02 ~]# vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

  notification_email {

    acassen@firewall.loc

    failover@firewall.loc

    sysadmin@firewall.loc

  }

  notification_email_from Alexandre.Cassen@firewall.loc

  smtp_server 10.13.4.13

  smtp_connect_timeout 30

  router_id LVS_DEVEL

}

vrrp_script chk_redis {

    script “killall -0 redis-server”

    interval 1

}

vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    virtual_router_id 100

    priority 99

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 1111

    }

    virtual_ipaddress {

        10.13.6.17

    }

#track_script {

#    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

[root@P2Pp_Red02 ~]# vi /etc/keepalived/scripts/redis_master.sh

#!/bin/bash

REDISCLI=”/usr/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 SLAVEOF 10.13.6.13 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

~

[root@P2Pp_Red02 ~]# vi /etc/keepalived/scripts/redis_backup.sh

#!/bin/bash

REDISCLI=”/usr/bin/redis-cli”

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

echo “[backup]” >> $LOGFILE

date >> $LOGFILE

echo “Being slave….

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 10.13.6.13 6379 >> $LOGFILE  2>&1

其余的两个文件跟主 redis 是一样的

本处将不再给模拟故障，但是测试时通过的，现在已经在生产环境中使用

Haproxy+Keepalived 搭建 Weblogic 高可用负载均衡集群 http://www.linuxidc.com/Linux/2013-09/89732.htm

Keepalived+HAProxy 配置高可用负载均衡 http://www.linuxidc.com/Linux/2012-03/56748.htm

CentOS 6.3 下 Haproxy+Keepalived+Apache 配置笔记 http://www.linuxidc.com/Linux/2013-06/85598.htm

Haproxy + KeepAlived 实现 WEB 群集 on CentOS 6 http://www.linuxidc.com/Linux/2012-03/55672.htm

Haproxy+Keepalived 构建高可用负载均衡 http://www.linuxidc.com/Linux/2012-03/55880.htm

Haproxy 实现 Exchange 全透明代理服务 http://www.linuxidc.com/Linux/2014-10/108530.htm