CentOS下Redis高可用安裝筆記

jopen 9年前發布 | 25K 次閱讀 Redis NoSQL數據庫

(WJW)Redis高可用安裝筆記

[x] 安裝環境介紹:

Master: T1

Slave: T2

VIP: 192.168.68.45

</blockquote>

[x] 安裝Redis(Master,Slave)

注意: 安裝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},`
</blockquote>

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</pre> 
[x] Redis啟動腳本(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 &</pre> 
[x] Redis停止腳本(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</pre> 
[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</pre> 
[x] 安裝Keepalived(Master,Slave): 


#wget http://www.keepalived.org/software/keepalived-1.2.13.tar.gz
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</pre> 
[x] notify_*解釋 


Keepalived在轉換狀態時會依照狀態來呼叫：
當進入Master狀態時會呼叫notify_master
當進入Backup狀態時會呼叫notify_backup
當發現異常情況時(track_script,track_interface失敗)進入Fault狀態呼叫notify_fault
當Keepalived程序終止時則呼叫notify_stop
 
[x] 在Master上創建如下配置文件： 


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"   ###監控腳本
  interval 2                                        ###監控時間
}


vrrp_instance VI_1 {
    nopreempt ###不搶占,防止腦裂
    state MASTER             #備的是BACKUP
    interface br0
    virtual_router_id 51
    priority 100            #備的是90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass redis
    }
    virtual_ipaddress {
        192.168.68.45
    }



track_script {
  chk_redis                       ###執行上面定義的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



}</pre> 
[x] 在Slave上創建如下配置文件： 


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"   ###監控腳本
  interval 2                                        ###監控時間
}


vrrp_instance VI_1 {
    nopreempt ###不搶占,防止腦裂
    state BACKUP             #備的是BACKUP
    interface br0
    virtual_router_id 51
    priority 90            #備的是90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass redis
    }
    virtual_ipaddress {
        192.168.68.45
    }



track_script {
  chk_redis                       ###執行上面定義的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



}</pre> 
[x] 在Master和Slave上創建監控Redis的腳本: 


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</pre> 
[x] 在Master與Slave創建如下腳本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</pre> 
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</pre> 
[x] 在Master上創建notity_master與notify_backup腳本: 


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


當keepalived配置為"搶占式"時,打開下面注釋


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


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


$REDISCLI SLAVEOF T2 6379 >> $LOGFILE  2>&1


sleep 10 #延遲10秒以后待數據同步完成后再取消同步狀態


echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1</pre> 
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


當keepalived配置為"搶占式"時,打開下面注釋


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


sleep 15 #延遲15秒待數據被對方同步完成之后再切換主從角色


echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF T2 6379 >> $LOGFILE  2>&1</pre> 
[x] 在Slave上創建notity_master與notify_backup腳本: 


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


當keepalived配置為"搶占式"時,打開下面注釋


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


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


$REDISCLI SLAVEOF T1 6379 >> $LOGFILE  2>&1


sleep 10 #延遲10秒以后待數據同步完成后再取消同步狀態


echo "Run SLAVEOF NO ONE cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1</pre> 
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


當keepalived配置為"搶占式"時,打開下面注釋


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


sleep 15 #延遲15秒待數據被對方同步完成之后再切換主從角色


echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF T1 6379 >> $LOGFILE  2>&1</pre> 
[x] 在Master和Slave上,給監控腳本都加上可執行權限： 


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

 
[x] 啟動步驟: 


    

  1. 

    啟動Master上的Redis 
    

    
/opt/redis/bin/startRedis.sh 
    

    2. 

  2. 

    啟動Slave上的Redis 
    

    
/opt/redis/bin/startRedis.sh 
    

    3. 

  3. 

    啟動Master上的Keepalived 
    

    
service keepalived start 
    

    4. 

  4. 

    啟動Slave上的Keepalived 
    

    
service keepalived start 
    

    5.
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