centos下MySQL主從同步配置

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centos下MySQL主從同步配置
一、環境

        主機:

                   master作業系統:centos 5.3

                   IP:192.168.1.222

                   MySQL版本:5.0.77

         從機:         

     slave作業系統:centos 5.3

                   IP:192.168.1.220

                   MySQL版本:5.0.77

 

 

 

二、建立資料庫

分別登入master機和slave機的mysql:mysql –u root –p

建立資料庫:create database repl;

 

 

 

三、master機和slave機的相關配置

1、修改master機器中mysql設定檔my.cnf,該檔案在/etc目錄下

在[mysqld]配置段添加如下欄位

server-id=1

log-bin=log

binlog-do-db=repl //需要同步的資料庫,如果沒有本行,即表示同步所有的資料庫

binlog-ignore-db=mysql //被忽略的資料庫


在master機上為slave機添加一同步帳號
grant replication slave on *.* to ‘repl‘@‘192.1681.220‘ identified by ‘123456‘;


重啟master機的mysql服務:service mysqld restart


用show master status 命令看日誌情況

mysql>show master status;

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

| File                | Position     | Binlog_Do_DB   | Binlog_Ignore_DB |

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

|    log.000003 |           98  | repl                 | mysql                    |

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

1 row in set (0.00 sec)

 

 

 


2、修改slave機中mysql設定檔

同樣在[mysqld]欄位下添加如下內容

server-id=2

master-host=192.168.1.222

master-user=repl

master-password=123456

master-port=3306

master-connect-retry=60

replicate-do-db=repl //同步的資料庫,不寫本行 表示 同步所有資料庫


然後重啟slave機的mysql


在slave機中進入mysql

mysql>start slave;

mysql>show slave statusG;
如果Slave_IO_Running、Slave_SQL_Running狀態為Yes則表明設定成功。

 

 

 

四、出現的問題

問題1 當我在執行start slave這條命令時,系統提示

ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO,

執行show slave status;又提示Empty set (0.00 sec),想不通問題在哪裡

 

或問題2 Slave_SQL_Running: No


後來發現,原來slave已經預設開啟,要先關閉再開啟

執行 slave stop;

再執行

change master to master_host=‘192.168.1.222‘,master_user=‘repl‘,master_password=‘123456‘, master_log_file=‘log.000003‘ ,master_log_pos=98;

然後執行 slave start;

這時 再執行show slave statusG

顯示如下:

*************************** 1. row ***************************

             Slave_IO_State: Waiting for master to send event

                Master_Host: 192.168.1.222

                Master_User: repl

                Master_Port: 3306

              Connect_Retry: 60

            Master_Log_File: log.000003

        Read_Master_Log_Pos: 98

            Relay_Log_File: mysqld-relay-bin.000002

              Relay_Log_Pos: 229

      Relay_Master_Log_File: log.000003

           Slave_IO_Running: Yes

          Slave_SQL_Running: Yes

            Replicate_Do_DB:

        Replicate_Ignore_DB:

         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: 98

            Relay_Log_Space: 229

            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

1 row in set (0.00 sec)

顯示紅色那兩行,說明配置成功。

 

 

 

五、測試主從伺服器是否能同步

在主伺服器上面建立一個表,必須在repl資料下

mysql> use repl

Database changed

mysql> create table test(id int,name char(10));

Query OK, 0 rows affected (0.00 sec)


mysql> insert into test values(1,‘zaq‘);

Query OK, 1 row affected (0.00 sec)


mysql> insert into test values(1,‘xsw‘);

Query OK, 1 row affected (0.00 sec)


mysql> select * from test;

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

| id    | name |

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

|    1    | zaq   |

|    1    | xsw |

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

2 rows in set (0.00 sec)

 


在從伺服器查看是否同步過來

mysql> use repl;

Database changed

mysql> select * from test;

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

| id    | name |

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

|     1 | zaq   |

|     1 | xsw |

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

2 rows in set (0.00 sec)

centos下MySQL主從同步配置

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