MySQL從庫上有一個IO線程負責從主庫取binlog到寫到本地。另外有一個SQL線程負責執行這些本地日誌,實現命令重放;mysql
1、環境sql
主機:數據庫
master操做系統:centos 5.3centos
IP:192.168.1.222服務器
MySQL版本:5.0.77ide
從機: 測試
slave操做系統:centos 5.3spa
IP:192.168.1.220操作系統
MySQL版本:5.0.77線程
2、建立數據庫
分別登陸master機和slave機的mysql:mysql –u root –p
建立數據庫:create database repl;
3、master機和slave機的相關配置
1、修改master機器中mysql配置文件my.cnf,該文件在/etc目錄下
在[mysqld]配置段添加以下字段
server-id=1
log-bin=log
binlog-do-db=repl //須要同步的數據庫,若是沒有本行,即表示同步全部的數據庫
binlog-ignore-db=mysql //被忽略的數據庫
在master機上爲slave機添加一同步賬號
grant replication slave on *.* to 'repl'@'192.1681.220' identified by '123456';
重啓master機的mysql服務:service mysqld restart
用show master status 命令看日誌狀況
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配置文件
一樣在[mysqld]字段下添加以下內容
server-id=2
master-host=192.168.1.222
master-user=repl
master-password=123456
master-port=3306
master-connect-retry=60
# replicate-ignore-db=mysql 忽略的數據庫
# master-connect-retry=60 若是從服務器發現主服務器斷掉,從新鏈接的時間差(秒)
#replicate-do-db=repl //同步的數據庫(須要備份的數據庫名),不寫本行 表示 同步全部數據庫
而後重啓slave機的mysql
在slave機中進入mysql
mysql>start slave;
mysql>show slave status\G;
若是Slave_IO_Running、Slave_SQL_Running狀態爲Yes則代表設置成功。
4、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),想不通問題在哪裏
後來發現,原來slave已經默認開啓,要先關閉再開啓
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;
而後執行 slave start;
這時 再執行show slave status\G
顯示以下:
*************************** 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。
5、測試主從服務器是否能同步
在主服務器上面新建一個表,必須在repl數據下
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)
在從服務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)
說明已經配置成功