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MySQL之-基於Keepalived實現雙機HA詳解(圖文)

黄舟
黄舟原創
2017-03-14 16:42:271328瀏覽

1、環境描述:

    OS:CentOS6.5_X64
    MASTER:192.168.0.202
    BACKUP:192.168.0.202
    BACKUP:192.168.0.202
    BACKUP:192.168.0.203#.21

##2、設定兩台

Mysql主主同步

關於MySQL的安裝大家也可以參考《 MySQL之-CentOS6.5 編譯安裝MySQL5.6.16 》,主主同步在主從同步的基礎上將從伺服器配置為先前主伺服器的Master,相當於在原來主從同步的基礎上,將原來的Slave設定為了原來Master的Master,大家也可以參考《MySQL之— —MS主從複製(讀寫分離)實作》 ,設定A為B的Master,B為A的Slave後,然後再設定B為A的Master,A設定為B的Slave。


[root@masterr ~]# yum install mysql-server mysql -y
[root@masterr ~]# service mysqld start
[root@masterr ~]# mysqladmin -u root proot
[root@masterr ~]# vi /etc/my.cnf  #开启二进制日志,设置id
[mysqld]
server-id = 1                    #backup这台设置2
log-bin = mysql-bin
binlog-ignore-db = mysql,information_schema       #忽略写入binlog日志的库
auto-increment-increment = 2             #字段变化增量值
auto-increment-offset = 1              #初始字段ID为1
slave-skip-errors = all                       #忽略所有复制产生的错误     
[root@masterr ~]# service mysqld restart

#先查看下log bin日誌與pos值位置



#master配置如下:

[root@ master ~]# mysql -u root -proot
mysql> GRANT  REPLICATION SLAVE ON *.* TO 'replication'@'192.168.0.%' IDENTIFIED  BY 'replication';
mysql> flush  privileges;
mysql> change  master to
    ->  master_host='192.168.0.203',
    ->  master_user='replication',
    ->  master_password='replication',
    ->  master_log_file='mysql-bin.000002',
    ->  master_log_pos=106;  #对端状态显示的值
mysql> start  slave;         #启动同步

backup配置如下:


[root@backup ~]#  mysql -u root -proot
mysql> GRANT  REPLICATION SLAVE ON *.* TO 'replication'@'192.168.0.%' IDENTIFIED  BY 'replication';
mysql> flush  privileges;
mysql> change  master to
    ->  master_host='192.168.0.202',
    ->  master_user='replication',
    ->  master_password='replication',
    ->  master_log_file='mysql-bin.000002',
    ->  master_log_pos=106;
mysql> start  slave;

#主主同步設定完畢,檢視同步狀態Slave_IO和Slave_SQL是YES說明主主同步成功。



在master

插入資料測試下:


在backup查看是否同步成功:



可以看到已經成功同步過去,同樣在backup插入到user表數據,一樣同步過去,雙主就做成功了。


3、設定keepalived實作熱備

[root@backup ~]# yum install -y pcre-devel openssl-devel popt-devel #安装依赖包
[root@masterr ~]# wget http://www.php.cn/
[root@masterr ~]# tar zxvf keepalived-1.2.7.tar.gz
[root@masterr ~]# cd keepalived-1.2.7
[root@masterr ~]#./configure --prefix=/usr/local/keepalived
make

#將keepalived設定成系統服務


[root@masterr ~]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
[root@masterr ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@masterr ~]# mkdir /etc/keepalived/
[root@masterr ~]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
[root@masterr ~]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
[root@masterr ~]# vi /etc/keepalived/keepalived.conf
! Configuration File forkeepalived
global_defs {
notification_email {
test@sina.com
 }
notification_email_from  admin@test.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id MYSQL_HA      #标识,双主相同
 }
vrrp_instance VI_1 {
 state BACKUP           #两台都设置BACKUP
 interface eth0
 virtual_router_id 51       #主备相同
 priority 100           #优先级,backup设置90
 advert_int 1
 nopreempt             #不主动抢占资源,只在master这台优先级高的设置,backup不设置
 authentication {
 auth_type PASS
 auth_pass 1111
 }
 virtual_ipaddress {
 192.168.0.204
 }
}
virtual_server 192.168.0.204 3306 {
 delay_loop 2
 #lb_algo rr              #LVS算法,用不到,我们就关闭了
 #lb_kind DR              #LVS模式,如果不关闭,备用服务器不能通过VIP连接主MySQL
 persistence_timeout 50  #同一IP的连接60秒内被分配到同一台真实服务器
 protocol TCP
 real_server 192.168.0.202 3306 {   #检测本地mysql,backup也要写检测本地mysql
 weight 3
 notify_down /usr/local/keepalived/mysql.sh    #当mysq服down时,执行此脚本,杀死keepalived实现切换
 TCP_CHECK {
 connect_timeout 3    #连接超时
 nb_get_retry 3       #重试次数
 delay_before_retry 3 #重试间隔时间
  }
}
[root@masterr ~]# vi /usr/local/keepalived/mysql.sh
#!/bin/bash
pkill keepalived
[root@masterr ~]# chmod +x /usr/local/keepalived/mysql.sh
[root@masterr ~]# /etc/init.d/keepalived start

##backup伺服器只修改priority為90、nopreempt不設定、real_server設定本地IP。
#授權兩台Mysql伺服器允許root遠端登錄,用於在其他伺服器登陸測試!

mysql> grant all on *.* to'root'@'192.168.0.%' identified by 'root';
mysql> flush privileges;

4、測試高可用性

1)透過Mysql客戶端透過VIP連接,看是否連接成功。

2)停止master這台mysql服務,是否能正常切換過去,可透過ip addr指令來查看VIP在哪台伺服器上。
3)可透過查看/var/log/messges日誌,看出主備切換流程
4)master伺服器故障復原後,是否主動搶佔資源,成為活動伺服器。

注意:服務啟動的順序:先啟動MySQL,後啟動Keepalived。

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