keepalived + redis 主备容灾部署

原创
2016/08/17 16:38
阅读数 143

方案图

方案部署

现网环境中有两个数据库主机,master, 和slave。以及一个vip

Master: 192.168.11.149

Slave:192.168.11.150

Vip:192.168.200.200

节点A Redis-Master 主节点,节点B Redis-Slave 备用节点,虚拟IP是对外提供访问的IP。虚拟IP在某个时刻只能属于某一个节点,另一个节点作为备用节点存在。当主节点不可用时,备用节点接管虚拟IP,提供正常服务。

安装redis

redis master安装

下载redis-3.0.3.tar.gz 创建redis 账户

#useradd  -d /home/cin_redis –s /bin/bash –m cin_redis
# passwd cin_redis

上传redis-3.0.3.tar.gz 解压

# tar –xzvf redis-3.0.3.tar.gz
#cd rediis-3.0.3/src
#mak MALLOC=libc
#make PREFIX=$HOME install

在redis的解压目录下有一个redis.conf 文件,编辑redis.conf文件

daemonize yes	后台模式运行
port 15093		端口
logfile “/home/cin_redis/redis-15093.log”
pidfile “/home/cin_redis/redis-15093.pid”

可以把该配置文件拷贝到bin目录下修改;启动redis

# redis-server redis.conf

redis slave 安装

redis slave机器上同样安装redis 数据库,安装步骤同2.1安装,修改redis.conf 文件

daemonize yes	后台模式运行
port 15093		端口
logfile “/home/cin_redis/redis-15093.log”
pidfile “/home/cin_redis/redis-15093.pid”

slaveof 192.168.11.149 15093 

可以把该配置文件拷贝到bin目录下修改;启动redis

#redis-server redis.conf

用redis-cli 客户端连接redis-master数据库,查看replication

redis master信息

用redis-cli客户端连接redis-slave数据库,查看replication

redis slave信息

安装keepalived

下载keepalived-1.2.23(https://codeload.github.com/acassen/keepalived/tar.gz/v1.2.23) 创建keepalived 账户

#useradd –m keepalived –d /home/keepalived –s /bin/bash
#passwd keepalived

上传keepalived-1.2.23.tar.gz

#tar –xzvf keepalived-1.2.23.tar.gz
#cd keepalived-1.2.23
#./configure –prefix=$HOME/keepalive
# make &make install
# cp  -r  /home/keepalived/keepalive/etc/keepalived  /etc 
# cp  /home/keepalived/keepalive/etc/rc.d/init.d/keepalived  /etc/rc.d/init.d
#cp /home/keepalived/keepalive/etc/sysconfig/keepalived  /etc/sysconfig
#ln –s /home/keepalived/keepalive/sbin/keepalived  /usr/sbin/
#chkconfig –add keepalived

按照以上步骤分别在redis-master 和 redis-slave 主机上安装keepalived工具

配置keepalived

redis master 配置

按照上面的步骤安装完keepalived,vim 打开/etc/keepalived下面的keepalived.conf 文件配置

! Configuration File for keepalived

vrrp_script chk_redis {
    script "/etc/keepalived/scripts/redis_check.sh"
    interval 2
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.200
    }
    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"
}

在/etc/keepalived 目录下创建scripts,

#cd /etc/keepalived/scripts
#touch redis_master.sh
#touch redis_backup.sh
#touch redis_fault.sh]
#touch redis_stop.sh
#touch redis_check.sh

redis_master.sh : 当keepalived切换成master时,会触发执行此脚本

redis_backuo.sh : 当keepalived 切换成slave时,会触发执行此脚本

redis_fault.sh : 当keepalived 出错时,会触发执行此脚本

redis_stop.sh : 当keepalived 停止时,会触发执行次脚本

redis_check.sh : keepalived定时调用此脚本检测redis 数据库是否连接正常

redis_master.sh文件内容:

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"

echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Beging master..." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF NO ONE cmd..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF NO ONE >> $LOGFILE 2>&1

redis_backup.sh文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"

echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 15
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PROT  SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1

redis_fault.sh 文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"

echo "[ERROR]-----keepalived is fault,change local redis to slave-----" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1

redis_stop.sh 文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"

echo "[ERROR]-----keepalived is stop,change local redis to slave-----" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF cmd ..." >> $LOGFILE

$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1

redis_check.sh 文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"

ALIVE=`$REDISCLI -h $LOCALIP -p $PORT PING`

if [ "$ALIVE" == "PONG" ];then
   echo "[INFO] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is health." >> $LOGFILE
   exit 0
else
   service keepalived stop
   echo "[ERROR] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is not health." >> $LOGFILE
   exit 1
fi

redis slave 配置

按照上面的步骤安装完keepalived,vim 打开/etc/keepalived下面的keepalived.conf 文件配置

! Configuration File for keepalived

vrrp_script chk_redis {
    script "/etc/keepalived/scripts/redis_check.sh"
    interval 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.200
    }
    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
}

在/etc/keepalived 目录下创建scripts,

#cd /etc/keepalived/scripts
#touch redis_master.sh
#touch redis_backup.sh
#touch redis_fault.sh
#touch redis_stop.sh
#touch redis_check.sh

redis_master.sh : 当keepalived切换成master时,会触发执行此脚本

redis_backuo.sh : 当keepalived 切换成slave时,会触发执行此脚本

redis_fault.sh : 当keepalived 出错时,会触发执行此脚本

redis_stop.sh : 当keepalived 停止时,会触发执行次脚本

redis_check.sh : keepalived定时调用此脚本检测redis 数据库是否连接正常

redis_master.sh 文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"

echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Beging master..." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF NO ONE cmd..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF NO ONE >> $LOGFILE 2>&1

redis_backup.sh 文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"

echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 15
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1

redis_fault.sh 文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"

echo "[ERROR]-----keepalived is fault,change local redis to slave-----" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1

redis_stop.sh 文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"

echo "[ERROR]-----keepalived is stop,change local redis to slave-----" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1

redis_check.sh 文件内容

#!/bin/bash

KPATH=/home/keepalived
RPATH=/home/cin_redis

REDISCLI=$RPATH/bin/redis-cli

LOGFILE=$KPATH/log/keepalived-redis-state.log

LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"

ALIVE=`$REDISCLI -h $LOCALIP -p $PORT PING`

if [ "$ALIVE" == "PONG" ];then
   echo "[INFO] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is health." >> $LOGFILE
   exit 0
else
   service keepalived stop
   echo "[ERROR] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is not health." >> $LOGFILE
   exit 1
fi

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