实验环境：两台centos6.5

mysql1 ip：10.1.1.20

mysql2  ip：10.1.1.21

mysql vip：10.1.1.25

一、安装mysql，并打造主主同步

主主同步就是两台机器互为主的关系，在任何一台机器上写入都会同步。

安装mysql的过程不解释，yum就好啦

配置主主同步

1.配置 /etc/my.cnf

[mysqld]

datadir=/var/lib/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

log-bin=binlog  #开启binlog功能

log-bin-index=binlog.index

sync_binlog=0

server_id = 1    #两台机器不能重复，一个1 一个2 就好

 

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

2.分别在两台机器上配置同步账号

10.1.1.20机器上：

[root@localhost ~]# mysql

Welcome to the MySQL monitor. Commands end with; or \g.

Your MySQL connection id is 2

Server version: 5.0.77-log Sourcedistribution

 

Type 'help;' or '\h' for help. Type '\c' toclear the buffer.

 

mysql> GRANT replication slave ON *.* TO'ab'@'%' identified by '123';

Query OK, 0 rows affected (0.00 sec)

 

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

10.1.1.21机器上：

[root@localhost ~]# mysql

Welcome to the MySQL monitor. Commands end with; or \g.

Your MySQL connection id is 2

Server version: 5.0.77-log Sourcedistribution

 

Type 'help;' or '\h' for help. Type '\c' toclear the buffer.

 

mysql> GRANT replication slave ON *.* TO'ab'@'%' identified by '123';

Query OK, 0 rows affected (0.00 sec)

 

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

3.设置同步

10.1.1.20机器上:

mysql> flush tables with read lock;

mysql> show master status;

+---------------+----------+--------------+------------------+

| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |

+---------------+----------+--------------+------------------+

| binlog.000003 | 365 | | |

+---------------+----------+--------------+------------------+

1 row in set (0.03 sec)

mysql> unlock tables;

Query OK, 0 rows affected (0.03 sec)

10.1.1.21机器上：

mysql> change master to master_host='10.1.1.20', master_port=3306, master_user='ab',master_password='123', master_log_file='binlog.000003',master_log_pos=365;

Query OK, 0 rows affected (0.06 sec)

mysql> start slave;

Query OK, 0 rows affected (0.00 sec)

mysql> show slave status \G  #执行这命令后 注意观察下面这两个参数，必须要都是yes才行

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

同样的 反过来做相同操作

10.1.1.21机器上:

mysql> flush tables with read lock;

mysql> show master status;

+---------------+----------+--------------+------------------+

| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |

+---------------+----------+--------------+------------------+

| binlog.000004 | 207 | | |

+---------------+----------+--------------+------------------+

1 row in set (0.03 sec)

mysql> unlock tables;

Query OK, 0 rows affected (0.03 sec)

10.1.1.20机器上：

 

mysql> change master tomaster_host='10.1.1.21', master_port=3306, master_user='ab',master_password='123', master_log_file='binlog.000004',master_log_pos=207;

Query OK, 0 rows affected (0.06 sec)

mysql> start slave;

Query OK, 0 rows affected (0.00 sec)

mysql> show slave status \G  #执行这命令后 注意观察下面这两个参数，必须要都是yes才行

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

介此，主主同步打造完成，可以简单测试一下，分别在两个机器上写数据 看看会不会同步到另一台机器上

PS：如果报错  Slave_IO_Running: NO  可以检查同步的账号是否创建正常！

二、安装keepalived 并设置监控

keepalived是安装在两台MySQL服务器上的

首先安装keepalived 过程不解释就正常解压安装就好

安装后配置 vim /etc/keepalived/keepalived.conf 内容如下

10.1.1.20的配置文件

! Configuration File for keepalived

global_defs {

  notification_email {

    acassen@firewall.loc

    failover@firewall.loc

    sysadmin@firewall.loc

  }

  notification_email_from Alexandre.Cassen@firewall.loc

  smtp_server 127.0.0.1

  smtp_connect_timeout 30

  router_id LVS_DEVEL

}

 

vrrp_instance VI_1 {

  state backup      #两台配置此处均是BACKUP

  interface eth0

  virtual_router_id 51

  priority 100      #优先级，另一台改为90 

  advert_int 1

  nopreempt          #不抢占，只在优先级高的机器上设置即可，优先级低的机器不设置

  authentication {

      auth_type PASS

      auth_pass 1111

  }

  virtual_ipaddress {

      10.1.1.25

  }

}

 

virtual_server 10.1.1.25 3306 {

  delay_loop 6

  lb_algo wrr

  lb_kind DR

  persistence_timeout 50        #会话保持时间 

  protocol TCP

 

real_server 10.1.1.20 3306 {

      weight 3

      notify_down /tmp/nimei.sh    #检测到mysql服务挂了就执行这个脚本（脚本要自己写哈）

      TCP_CHECK {

      connect_timeout 10        #连接超时时间

      nb_get_retry 3            #重连次数 

      delay_before_retry 3      #重连间隔时间

      connect_port 3306        #健康检查端口 

        }

      }

}

10.1.1.21 的配置文件

! Configuration File for keepalived

global_defs {

  notification_email {

    acassen@firewall.loc

    failover@firewall.loc

    sysadmin@firewall.loc

  }

  notification_email_from Alexandre.Cassen@firewall.loc

  smtp_server 127.0.0.1

  smtp_connect_timeout 30

  router_id LVS_DEVEL

}

 

vrrp_instance VI_1 {

  state backup

  interface eth0

  virtual_router_id 51

  priority 90

  advert_int 1

  authentication {

      auth_type PASS

      auth_pass 1111

  }

  virtual_ipaddress {

      10.1.1.25

  }

}

 

virtual_server 10.1.1.25 3306 {

  delay_loop 6

  lb_algo wrr

  lb_kind DR

  persistence_timeout 50

  protocol TCP

 

real_server 10.1.1.21 3306 {

      weight 3

      notify_down /tmp/nimei.sh

      TCP_CHECK {

      connect_timeout 10

      nb_get_retry 3

      delay_before_retry 3

      connect_port 3306

          }

      }

} 

编写监控mysql服务是否挂了的脚本，按照上面配置文件的位置编写脚本。

vim /tmp/nimei.sh

#!/bin/sh 

pkill keepalived

脚本很简单啊 就一句，目的是当keepalived检测到mysql服务挂了之后触发这个脚本，杀死keepalived进程，让另一台机器接管

好 修改后启动keeplived服务

介此整个集群搭建完成

三、测试

找一台机器用虚拟ip连接mysql

[root@localhost html]# mysql -uab  -h 10.1.1.25 -p123

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 736

Server version: 5.1.66-log Source distribution

 

Copyright (c) 2000, 2012,  and/or its affiliates. All rights reserved.

 

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

这样成功连上了，然后你可以任意关闭某台机器，或者某台机器的mysql服务，看看还能不能连上！！