CentOS伺服器環境下MySQL主從同步配置方法
本文例項講述了CentOS伺服器環境下MySQL主從同步配置方法。分享給大家供大家參考,具體如下:
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配置檔案my.cnf,該檔案在/etc目錄下
在[mysqld]配置段新增如下欄位
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機新增一同步帳號
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
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配置檔案
同樣在[mysqld]欄位下新增如下內容
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 status\G;
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
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
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
複製程式碼 程式碼如下: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 status\G
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)
至此,說明配置成功。
五、測試主從伺服器是否能同步
在主伺服器上面新建一個表,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)
在從伺服器檢視是否同步過來
mysql> use repl; Database changed mysql> select * from test; +------+------+ | id | name | +------+------+ | 1 | zaq | | 1 | xsw | +------+------+ 2 rows in set (0.00 sec)
說明已經配置成功。
希望本文所述對大家CentOS伺服器維護有所幫助。