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README.md

Role IP
Redis 1 100.67.191.111
Redis 2 100.67.191.112
Redis VIP 100.67.191.110

Keepalived virtual router id : 11

Redis 1為Master
Redis 2為Slave

  1. 於Redis 1和Redis 2下載 Redis 和 keepalived
wget http://download.redis.io/releases/redis-4.0.6.tar.gz
tar -zxvf redis-4.0.6.tar.gz
sudo sudo apt-get install keepalived
  1. Redis 1 and 2 編譯Redis
cd redis-4.0.6
sudo make install
  1. 設定Redis cluster

[On Master]
修改redis.conf

daemonize  yes
bind  0.0.0.0
pidfile /var/run/redis_6379.pid
logfile "/var/log/redis.log"

[On Slave]
修改redis.conf，跟Master不一樣的是Slave多了一行slaveof <masterIP> <port>

daemonize  yes
bind  0.0.0.0
pidfile /var/run/redis_6379.pid
logfile "/var/log/redis.log"
slaveof 100.67.191.111 6379

啟動Redis
[On Master and Slave]

cd redis-4.0.6
sudo redis-server ./redis.conf

檢查Redis狀態
[On Master and Slave]

redis-cli info replication
  1. 設定Keepalived

[On Master]

edit /etc/keepalived/keepalived.conf

global_defs {
	router_id redis
}
 
vrrp_script chk_redis {
	script "/etc/keepalived/scripts/check_redis.sh"
	interval 4
	weight -5
	fall 3  
	rise 2
}
 
vrrp_instance VI_REDIS {
	state MASTER
	interface eth1
	virtual_router_id 11
	priority 100
	advert_int 1
	nopreempt
 
	authentication {
		auth_type PASS
		auth_pass 1111
	}
 
	virtual_ipaddress {
		192.168.99.10
	}
 
	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/redsi_stop.sh
}

Edit script for redis HA
edit /etc/keepalived/scripts/check_redis.sh for checking master reids

#!/bin/bash  
CHECK=`/usr/local/bin/redis-cli PING`  
if [ "$CHECK" == "PONG" ] ;then  
      echo $CHECK  
      exit 0  
else   
      echo $CHECK  
      service keepalived stop 
      exit 1  
fi

edit /etc/keepalived/scripts/redis_backup.sh for master back online and being slave of new master

#!/bin/bash
REDISCLI="/usr/local/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 192.168.99.12 6379 >> $LOGFILE  2>&1

edit /etc/keepalived/scripts/redis_fault.sh

# !/bin/bash
LOGFILE=/var/log/keepalived-redis-state.log 
echo "[fault]" >> $LOGFILE 
date >> $LOGFILE

edit /etc/keepalived/scripts/redis_master.sh

#!/bin/bash
REDISCLI="/usr/local/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 192.168.99.12 6379 >> $LOGFILE  2>&1
sleep 10 
echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1

edit /etc/keepalived/scripts/redis_stop.sh

# !/bin/bash
LOGFILE=/var/log/keepalived-redis-state.log 
echo "[stop]" >> $LOGFILE 
date >> $LOGFILE

[On Slave]

edit /etc/keepalived/keeplived.conf for slave keepalived

global_defs {
	router_id redis
}
 
vrrp_script chk_redis {
	script "/etc/keepalived/scripts/check_redis.sh"
	interval 4
	weight -5
	fall 3  
	rise 2
}
 
vrrp_instance VI_REDIS {
	state BACKUP
	interface eth1
	virtual_router_id 11
	priority 99
	advert_int 1
	nopreempt
 
	authentication {
		auth_type PASS
		auth_pass 1111
	}
 
	virtual_ipaddress {
		192.168.99.10
	}
 
	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/redsi_stop.sh
}

Edit script for redis HA
/etc/keepalived/scripts/check_redis.sh for checking slave reids

#!/bin/bash  
CHECK=`/usr/local/bin/redis-cli PING`  
if [ "$CHECK" == "PONG" ] ;then  
      echo $CHECK  
      exit 0  
else   
      echo $CHECK  
      service keepalived stop
      exit 1  
fi

edit /etc/keepalived/scripts/redis_backup.sh for master back online and being slave of new master

#!/bin/bash
REDISCLI="/usr/local/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 192.168.99.11 6379 >> $LOGFILE  2>&1

edit /etc/keepalived/scripts/redis_fault.sh

# !/bin/bash
LOGFILE=/var/log/keepalived-redis-state.log 
echo "[fault]" >> $LOGFILE 
date >> $LOGFILE

edit /etc/keepalived/scripts/redis_master.sh

#!/bin/bash
REDISCLI="/usr/local/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 192.168.99.11 6379 >> $LOGFILE  2>&1
sleep 10 
echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1

edit /etc/keepalived/scripts/redis_stop.sh

# !/bin/bash
LOGFILE=/var/log/keepalived-redis-state.log 
echo "[stop]" >> $LOGFILE 
date >> $LOGFILE

編輯完master/slave的scripts後
記得用chmod a+x 把所有腳本設定為可執行
並且在redis-server啟用的狀態下執行 check_redis.sh
檢查腳本以及redis-server運作狀況

Start keepalived
[On master and slave]

sudo systemctl restart keepalived

Redis cluster測試

  1. Master/Slave寫入測試

[On Master]

redis-cli set a hello

[On Slave]

redis-cli get a
"hello"
  1. VIP 寫入測試
    [On other machine]
redis-cli -h 100.67191.110 set b test
> OK
redis-cli -h 100.67191.110 get b
> "test"
  1. HA 測試

[On Redis 1]
關閉redis server

sudo pkill redis-server

測試針對VIP寫入與讀取，驗證master轉移到Redis 2
[On other machine]

redis-cli -h 100.67191.110 set c test
> OK
redis-cli -h 100.67191.110 get c
> "test"

[On Redis 2]

ip a

應該看到VIP 已經轉移到Redis 2上面

回到Redis 1重新啟動Redis server和keepalived，驗證VIP 切換回Redis 1
[On Redis 1]

cd redis-4.0.6
sudo redis-server ./redis.conf
sudo systemctl restart keepalived

測試Redis 1是否能夠同步最新資訊
[On Redis 1]

redis-cli get c
> "test"

[On Redis 1]

ip a

應該看到VIP 已經轉移到Redis 1上面

到此為止已經完成Redis HA環境的架設