mysql互爲主備

有server1=192.168.0.17 和 server2=192.168.0.18倆臺mysql server

其中；server1主機上配置server-id=1      server2上配置：server-id=2

 

17 Server1上mysql的配置：

linux 內核：

#uname -r
2.6.32-220.el6.x86_64

 

mysql版本：

#mysql -u root -p
Enter password:輸入mysql密碼

mysql> status

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

mysql  Ver 14.14 Distrib 5.5.22, for Linux (x86_64) using  EditLine wrapper  //數據版本號
................................

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

//建立mysql同步用戶，只容許bak這個用戶經過192.168.0.18這臺主機上鍊接。

mysql>grant replication slave on *.* to bak@192.168.0.18 identified by 'wdmysql';

 

編輯mysq1主配置文件，在/etc/my.cnf中添加如下內容

 

server-id = 1   #最好是找到這一行，省的手工添加避免衝突，
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

 

//從新啓動mysql server

#server mysql restart

 

18  Server2上mysql的配置：

linux 內核：

#uname -r
2.6.32-220.el6.x86_64

 

mysql版本：

#mysql -u root -p
Enter password:輸入mysql密碼

mysql> status

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

mysql  Ver 14.14 Distrib 5.5.22, for Linux (x86_64) using  EditLine wrapper  //數據版本號
................................

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

建立mysql同步用戶，只容許bak這個用戶經過192.168.0.17這臺主機上鍊接。

grant replication slave on *.* to bak@192.168.0.17 identified by 'wdmysql';

 

編輯mysq2主配置文件，在/etc/my.cnf中添加如下內容

 

[mysqld]       #找到這一行，在這個下面添加如下內容；

server-id = 2                               #//最好是找到這一行，省的手工添加衝突，

 

character_set_server=utf8          #這個對本次試驗沒有時間用處，在網上看見有人改mysql字符集報錯，隨便我在這給加上了

 

#master-host = 192.168.0.17         # 指定主服務器IP地址
#master-user = bak                        # 指定在主服務器上能夠進行同步的用戶名
#master-password = wdmysql            # 密碼
#master-port = 3306                         # 同步所用端口
#master-connect-retry = 60               # 斷點重新鏈接時間
replicate-ignore-db = mysql             # 屏蔽對mysql庫的同步
replicate-ignore-db = test            # 屏蔽對test庫的同步
binlog-ignore-db =mysql

replicate-do-db = bbsdb                      # 同步的數據庫的名稱
binlog-do-db = bbsdb                      # 二進制須要同步的數據庫名
replicate-do-db = phpmyadmin                     # 同步的數據庫的名稱
binlog-do-db = phpmyadmin                      # 二進制須要同步的數據庫名
binlog-ignore-db = test  

//上面帶有 "master_" 都被我註釋掉了，由於個人mysql不支持這些參數；

 

而後從新啓動mysql服務，

#server mysql restart

 

//下面的步驟都須要在倆臺mysql上操做一遍；

 

#mysql -u root -p
Enter password: 輸入mysql密碼

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

mysql> stop slave;

mysql> start slave;

mysql> show slave status\G

 

//主要看這兩行，是否都爲「yes」，若是不是,請查看日誌文件，通常都有提示；

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

 Slave_IO_Running: Yes
 Slave_SQL_Running: Yes

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

 

//通常狀況 Slave_IO_Running:會出現NO，Slave_SQL_Running 通常沒事，若是出現如下狀況請執行如下操做；

 

先登陸mysql。執行如下命令。

 

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)

 

從上面的狀態能夠看到，此時從主庫沒法同步；

而後登陸server1主數據庫,容許從數據庫同步相關數據；
mysql> grant replication slave on *.* to bak @192.168.0.18 identified by 'wdmysql';

 

再次重啓從數據庫，登陸進去查看狀態時，若是仍是不行的話再繼續往下操做。

 

mysql> stop slave;

//先到另外一臺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上操做

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)

 

而後在server2上面再操做一遍，這樣就能夠實現mysql的實時同步了。

能夠在bbs數據庫建立表，或者建立phpmyadmin數據庫上建立表。

而後到另外一臺mysql上查看是否多了一個新表。若是有實驗成功~