keepalived + mysql 雙主多從

標籤：mysql keepalived

keepalived 的熱備可以看文檔： keepalived的配置使用

mysql 的主從 的文檔講解：mysql 主從複製

keepalived的雙主，就是主從的一種， 大家看一眼就懂了，為了省力， 下面的雙主配置我直接網上找了一篇，在下面，大家隨便看下

keepalived的雙子多從的整體結構 如：

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1、配置兩台Mysql主主同步
[[email protected] ~]# yum install mysql-server mysql -y 
[[email protected] ~]# service mysqld start 
[[email protected] ~]# mysqladmin -u root password 123.com 
[[email protected] ~]# vi /etc/my.cnf  #開啟二進位日誌，設定id 
[mysqld] 
server-id = 1                    #backup這台設定2 
log-bin = mysql-bin 
binlog-ignore-db = mysql,information_schema      #忽略寫入binlog日誌的庫 
auto-increment-increment = 2            #欄位變化增量值 
auto-increment-offset = 1              #初始欄位ID為1 
slave-skip-errors = all                      #忽略所有複製產生的錯誤      
[[email protected] ~]# service mysqld restart

#先查看下log bin日誌和pos值位置

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master配置如下：

[[email protected] master ~]# mysql -u root -p123.com 
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;  #對端狀態顯示的值 
mysql> start  slave;        #啟動同步

backup配置如下：

[[email protected] ~]#  mysql -u root -p123.com 
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;

#主主同步配置完畢，查看同步狀態Slave_IO和Slave_SQL是YES說明主主同步成功。

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在master插入資料測試下：

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在backup查看是否同步成功：

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

2、配置keepalived實現熱備
[[email protected] ~]# yum install -y pcre-devel openssl-devel popt-devel #安裝依賴包

[[email protected] ~]# wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz 
[[email protected] ~]# tar zxvf keepalived-1.2.7.tar.gz 
[[email protected] ~]# cd keepalived-1.2.7 
[[email protected] ~]#./configure --prefix=/usr/local/keepalived 
make && make install

#將keepalived配置成系統服務

[[email protected] ~]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ 
[[email protected] ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ 
[[email protected] ~]# mkdir /etc/keepalived/ 
[[email protected] ~]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ 
[[email protected] ~]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

[[email protected] ~]# vi /etc/keepalived/keepalived.conf 
! Configuration File forkeepalived 
global_defs { 
notification_email { 
[email protected] 
 } 
notification_email_from  [email protected] 
smtp_server 127.0.0.1 
smtp_connect_timeout 30 
router_id MYSQL_HA      #標識，雙主相同 
 } 
vrrp_instance VI_1 { 
 state BACKUP          #兩台都設定BACKUP 
 interface eth0 
 virtual_router_id 51      #主備相同 
 priority 100          #優先順序，backup設定90 
 advert_int 1 
 nopreempt            #不主動搶佔資源，只在master這台優先順序高的設定，backup不設定 
 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演算法，用不到，我們就關閉了 
 #lb_kind DR              #LVS模式，如果不關閉，待命伺服器不能通過VIP串連主MySQL 
 persistence_timeout 50  #同一IP的串連60秒內被分配到同一台真實伺服器 
 protocol TCP 
 real_server 192.168.0.202 3306 {  #檢測本地mysql，backup也要寫檢測本地mysql 
 weight 3 
 notify_down /usr/local/keepalived/mysql.sh    #當mysq服down時，執行此指令碼，殺死keepalived實現切換 
 TCP_CHECK { 
 connect_timeout 3    #連線逾時 
 nb_get_retry 3      #重試次數 
 delay_before_retry 3 #稍候再試時間 
  } 
}

 

[[email protected] ~]# vi /usr/local/keepalived/mysql.sh 
#!/bin/bash 
pkill keepalived 
[[email protected] ~]# chmod +x /usr/local/keepalived/mysql.sh 
[[email protected] ~]# /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遠程登入，用於在其他伺服器登陸測試！
mysql> grant all on *.* to‘root‘@‘192.168.0.%‘ identified by ‘123.com‘;
mysql> flush privileges;
3、測試高可用性
1、通過Mysql用戶端通過VIP串連，看是否串連成功。
2、停止master這台mysql服務，是否能正常切換過去，可通過ip addr命令來查看VIP在哪台伺服器上。

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3、可通過查看/var/log/messges日誌，看出主備切換過程
4、master伺服器故障恢複後，是否主動搶佔資源，成為活動伺服器。

keepalived + mysql 雙主多從