企业Redis+keepalived高可用实施方案-白红宇

企业Redis+keepalived高可用实施方案

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发布时间：2019-06-22

本文共 6311 字，大约阅读时间需要 21 分钟。

环境架构图：

环境部署

Redis-M	10.20.0.100
Redis-S	10.20.0.200
VIP	10.20.0.150

1,redis安装软件（两台同时安装M S）

#mkdir /home/tools -p

#cd /home/tools

#wget

#yum -y install tcl

#tar zxvf redis-3.0.5.tar.gz

#cd redis-3.0.5

#make MALLOC=libc

#cd src && make all

#make PREFIX=/usr/local/redis install

#LANG=EN

#echo'export PATH=/usr/local/redis/bin/:$PATH' >> /etc/profile

#source /etc/profile

#mkdir /usr/local/redis/conf

#cd /home/tools/redis-3.0.5

#cp redis.conf /usr/local/redis/conf/

#sysctl vm.overcommit_memory=1 如果不执行的话会报错

#echo never > /sys/kernel/mm/transparent_hugepage/enabled

#redis-server /usr/local/redis/conf/redis.conf & 后台启动

#lsof-i:6379 查看端口

#COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODENAME

#redis-ser5970 root 4u IPv6 36532 0t0 TCP *:6379 (LISTEN)

#redis-ser5970 root 5u IPv4 36534 0t0 TCP *:6379 (LISTEN)

#killall redis-server 杀掉redis进程内存不够的话

#redis正确关闭方式

#redis-cli shutdown

设计思路：

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，同时关闭主从复制功能；

当 Master 恢复正常，则从Slave同步数据，同步数据之后关闭主从复制功能，恢复Master身份，于此同时Slave等待Master同步数据完成之后，恢复Slave身份。

然后依次循环。

需要注意的是，这样做需要在Master与Slave上都开启本地化策略，否则在互相自动切换的过程中，未开启本地化的一方会将另一方的数据清空，造成数据完全丢失。

2,keepalived安装（两台同时安装）

# wget

# keepalived-1.2.19.tar.gz

# cd /software

# tar zxvf keepalived-1.2.19.tar.gz

# cd keepalived-1.2.19

# ./configure

# make && make install

# /bin/cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/ ##生成启动命令

# /bin/cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/ ##配置启动脚本的参数

# mkdir /etc/keepalived ##创建默认的keepalived配置文件路径

# /bin/cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/ ####把keepalived.conf模板拷贝到/etc/keepalived下

# /bin/cp /usr/local/sbin/keepalived /usr/sbin/

# /etc/init.d/keepalived start 或者/etc/init.d/keepalived stop

查看进程是否起来

#ps -ef | grep keepalived

添加日志

vi /etc/sysconfig/keepalived

KEEPALIVED_OPTIONS="-D -d -S 0"

##参数解释都在#注释里面

2. 修改主从节点日志配置文件/etc/rsyslog.conf

#vi /etc/rsyslog.conf

加入如下配置：

#keepalived -S 0

local0.* /var/log/keepalived.log

3.重启日志服务

# /etc/init.d/rsyslog restart

4.检查/var/log/keepalived.log文件是否存在

3,设置master上面的配置文件

vim /etc/keepalived/keepalived.conf

global_defs {

router_id redis100

}

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 150

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

chk_redis

}

virtual_ipaddress {

10.20.0.150

}

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

}

4,设置Slave配置

vim /etc/keepalived/keepalived.conf

global_defs {

router_id redis200

}

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 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

chk_redis

}

virtual_ipaddress {

10.20.0.150

}

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

}

5,在Master和Slave上创建监控Redis的脚本

# mkdir/etc/keepalived/scripts

# vim/etc/keepalived/scripts/redis_check.sh

cat redis_check.sh

#!/bin/bash

ALIVE=`/usr/local/redis/bin/redis-cli PING`

if [ "$ALIVE" == "PONG" ]; then

echo $ALIVE

exit 0

else

echo $ALIVE

exit 1

6,在slave从服务器创建redis的脚本

#!/bin/bash

ALIVE=`/usr/local/redis/bin/redis-cli PING`

if [ "$ALIVE" == "PONG" ]; then

echo $ALIVE

exit 0

else

echo $ALIVE

exit 1

编写以下负责运作的关键脚本：

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

因为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

当发现异常情况时进入Fault状态呼叫notify_fault

当Keepalived程序终止时则呼叫notify_stop

7,首先，在Redis Master上创建notity_master与notify_backup两个文件脚本：

# vim/etc/keepalived/scripts/redis_master.sh

cat redis_master.sh

#!/bin/bash

REDISCLI="/usr/local/redis/bin/redis-cli"

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

echo "[master]" >> $LOGFILE

echo "Being master...." >> $LOGFILE 2>&1

echo "Run SLAVEOF cmd ..." >> $LOGFILE

$REDISCLI SLAVEOF 10.20.0.200 6379 >> $LOGFILE 2>&1

sleep 10

echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE

$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1

# vim /etc/keepalived/scripts/redis_backup.sh

cat redis_backup.sh

#!/bin/bash

REDISCLI="/usr/local/redis/bin/redis-cli"

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

echo "[backup]" >> $LOGFILE

date >> $LOGFILE

echo "Being slave...." >> $LOGFILE 2>&1

sleep 15

echo "Run SLAVEOF cmd ..." >> $LOGFILE

$REDISCLI SLAVEOF 10.20.0.200 6379 >> $LOGFILE 2>&1

接着，在RedisSlave从服务器上创建notity_master与notify_backup脚本：

# vim/etc/keepalived/scripts/redis_master.sh

cat redis_master.sh

#!/bin/bash

REDISCLI="/usr/local/redis/bin/redis-cli"

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

echo "[master]" >> $LOGFILE

echo "Being master...." >> $LOGFILE 2>&1

echo "Run SLAVEOF cmd ..." >> $LOGFILE

$REDISCLI SLAVEOF 10.20.0.100 6379 >> $LOGFILE 2>&1

sleep 10

echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE

$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1

# vim /etc/keepalived/scripts/redis_backup.sh

cat redis_backup.sh

#!/bin/bash

REDISCLI="/usr/local/redis/bin/redis-cli"

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

echo "[backup]" >> $LOGFILE

date >> $LOGFILE

echo "Being slave...." >> $LOGFILE 2>&1

sleep 15

echo "Run SLAVEOF cmd ..." >> $LOGFILE

$REDISCLI SLAVEOF 10.20.0.100 6379 >> $LOGFILE 2>&1

8,然后在master和slave服务器各自创建相同的脚本

# vim /etc/keepalived/scripts/redis_fault.sh

cat redis_fault.sh

#!/bin/bash

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

echo "[fault]" >> $LOGFILE

date >> $LOGFILE

# vim /etc/keepalived/scripts/redis_stop.sh

# cat redis_stop.sh

#!/bin/bash

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

echo "[stop]" >> $LOGFILE

date >> $LOGFILE

主从服务器：给脚本加上可执行的权限

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

9,脚本创建完成以后，我们开始按照如下流程进行测试：

1.启动Master上的Redis

2.启动Slave上的Redis

3.启动Master上的Keepalived

/etc/init.d/keepalivedstart

4.启动Slave上的Keepalived

/etc/init.d/keepalivedstart

转载于:https://blog.51cto.com/yiyezi/1750499

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