mysql互为主备

有server1=192.168.0.17 和 server2=192.168.0.18俩台mysql server

其中；server1主机上配置server-id=1      server2上配置：server-id=2

 

17 Server1上mysql的配置：

linux 内核：

#uname -r
2.6.32-220.el6.x86_64

 

mysql版本：

#mysql -u root -p
Enter password:输入mysql密码

mysql> status

--------------
...............................

mysql  Ver 14.14 Distrib 5.5.22, for Linux (x86_64) using  EditLine wrapper  //数据版本号
................................

--------------

//创建mysql同步用户，只允许bak这个用户通过192.168.0.18这台主机上连接。

mysql>grant replication slave on *.* to [email protected] identified by 'wdmysql';

 

编辑mysq1主配置文件，在/etc/my.cnf中添加以下内容

 

server-id = 1   #最好是找到这一行，省的手工添加避免冲突，
character_set_server=utf8

log-bin = mysql-bin
binlog-ignore-db = mysql
binlog-do-db = bbsdb
binlog-do-db = phpmyadmin
replicate-do-db = phpmyadmin
binlog-ignore-db = test
# master-host = 192.168.0.18
#master-user = bak
#master-password = wdmysql
#master-port = 3306 
#master-connect-retry = 60
replicate-ignore-db = mysql
replicate-ignore-db = test
replicate-do-db = bbsdb

 

//重新启动mysql server

#server mysql restart

 

18  Server2上mysql的配置：

linux 内核：

#uname -r
2.6.32-220.el6.x86_64

 

mysql版本：

#mysql -u root -p
Enter password:输入mysql密码

mysql> status

--------------
...............................

mysql  Ver 14.14 Distrib 5.5.22, for Linux (x86_64) using  EditLine wrapper  //数据版本号
................................

--------------

创建mysql同步用户，只允许bak这个用户通过192.168.0.17这台主机上连接。

grant replication slave on *.* to [email protected] identified by 'wdmysql';

 

编辑mysq2主配置文件，在/etc/my.cnf中添加以下内容

 

[mysqld]       #找到这一行，在这个下面添加以下内容；

server-id = 2                               #//最好是找到这一行，省的手工添加冲突，

 

character_set_server=utf8          #这个对本次试验没有时间用处，在网上看见有人改mysql字符集报错，随便我在这给加上了

 

#master-host = 192.168.0.17         # 指定主服务器IP地址
#master-user = bak                        # 指定在主服务器上可以进行同步的用户名
#master-password = wdmysql            # 密码
#master-port = 3306                         # 同步所用端口
#master-connect-retry = 60               # 断点从新连接时间
replicate-ignore-db = mysql             # 屏蔽对mysql库的同步
replicate-ignore-db = test            # 屏蔽对test库的同步
binlog-ignore-db =mysql

replicate-do-db = bbsdb                      # 同步的数据库的名称
binlog-do-db = bbsdb                      # 二进制需要同步的数据库名
replicate-do-db = phpmyadmin                     # 同步的数据库的名称
binlog-do-db = phpmyadmin                      # 二进制需要同步的数据库名
binlog-ignore-db = test  

//上面带有 "master_" 都被我注释掉了，因为我的mysql不支持这些参数；

 

然后重新启动mysql服务，

#server mysql restart

 

//下面的步骤都需要在俩台mysql上操作一遍；

 

#mysql -u root -p
Enter password: 输入mysql密码

..................

mysql> stop slave;

mysql> start slave;

mysql> show slave status\G

 

//主要看这两行，是否都为“yes”，如果不是,请查看日志文件，一般都有提示；

.................................

 Slave_IO_Running: Yes
 Slave_SQL_Running: Yes

....................................

 

//一般情况 Slave_IO_Running:会出现NO，Slave_SQL_Running 一般没事，如果出现以下情况请执行以下操作；

 

先登录mysql。执行以下命令。

 

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State:
                  Master_Host: 192.168.0.18
                  Master_User: bak
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 107
               Relay_Log_File: server7-relay-bin.000002
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000003
             Slave_IO_Running: No
            Slave_SQL_Running: Yes

              Replicate_Do_DB: phpmyadmin,bbsdb
          Replicate_Ignore_DB: mysql,test
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 107
              Relay_Log_Space: 411
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 2
1 row in set (0.00 sec)

 

从上面的状态可以看到，此时从主库无法同步；

然后登录server1主数据库,允许从数据库同步相关数据；
mysql> grant replication slave on *.* to bak @192.168.0.18 identified by 'wdmysql';

 

再次重启从数据库，登录进去查看状态时，如果还是不行的话再继续往下操作。

 

mysql> stop slave;

//先到另一台mysql上查看

mysql> show master status;
+------------------+----------+------------------+------------------+
| File             | Position | Binlog_Do_DB     | Binlog_Ignore_DB |
+------------------+----------+------------------+------------------+
| mysql-bin.000003 |      107 | bbsdb,phpmyadmin | mysql,test       |
+------------------+----------+------------------+------------------+
1 row in set (0.00 sec)

 

//在server1上操作

mysql> change master to master_host='192.168.0.18',master_user='bak',master_password='wdmysql',master_log_file='mysql-bin.000003',master_log_pos=107;

 

mysql> start slave;

 

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.0.18
                  Master_User: bak
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 107
               Relay_Log_File: server7-relay-bin.000003
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000003
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: phpmyadmin,bbsdb
          Replicate_Ignore_DB: mysql,test
           Replicate_Do_Table:
       Replicate_Ignore_Table:
      Replicate_Wild_Do_Table:
  Replicate_Wild_Ignore_Table:
                   Last_Errno: 0
                   Last_Error:
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 107
              Relay_Log_Space: 557
              Until_Condition: None
               Until_Log_File:
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File:
           Master_SSL_CA_Path:
              Master_SSL_Cert:
            Master_SSL_Cipher:
               Master_SSL_Key:
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error:
               Last_SQL_Errno: 0
               Last_SQL_Error:
  Replicate_Ignore_Server_Ids:
             Master_Server_Id: 2
1 row in set (0.00 sec)

 

然后在server2上面再操作一遍，这样就可以实现mysql的实时同步了。

可以在bbs数据库创建表，或者创建phpmyadmin数据库上创建表。

然后到另一台mysql上查看是否多了一个新表。如果有实验成功~