linux centos下配置mysql主从同步的步骤
linux centos下配置mysql主从同步的步骤
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linux centos下配置mysql主从同步的步骤:
一、主机环境
主机:
master操作系统:centos5.3
IP:192.168.1.222
MySQL版本:5.0.77
从机:
slave操作系统:centos5.3
IP:192.168.1.220
MySQL版本:5.0.77
二、创建数据库
分别登录master机和slave机的mysql:mysql–u root–p
创建数据库:create database repl;
三、master机和slave机的相关配置
1、修改master机器中mysql配置文件my.cnf,该文件在/etc目录下
在[mysqld]配置段添加如下字段
server-id=1
log-bin=log
binlog-do-db=repl//需要同步的数据库,如果没有本行,即表示同步所有的数据库
binlog-ignore-db=mysql//被忽略的数据库
在master机上为slave机添加一同步帐号
grant replication slave on*.*to'repl'@'192.1681.220' identified by'123456';
重启master机的mysql服务:service mysqld restart
用show master status命令看日志情况
mysql>show master status;
+-----------------+------------+-------------------+-----------------------+
File|Position|Binlog_Do_DB|Binlog_Ignore_DB|
+-----------------+------------+-------------------+-----------------------+
log.000003|98|repl|mysql|
+-----------------+------------+-------------------+-----------------------+
1row in set(0.00sec)
2、修改slave机中mysql配置文件
同样在[mysqld]字段下添加如下内容
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//同步的数据库,不写本行表示同步所有数据库
然后重启slave机的mysql
在slave机中进入mysql
mysql>start slave;
mysql>show slave status\G;
如果Slave_IO_Running、Slave_SQL_Running状态为Yes则表明设置成功。
四、出现的问题
当我在执行start slave这条命令时,系统提示
ERROR1200(HY000):The server is not configured as slave;fix in config file or with CHANGE MASTER TO,
执行show slave status;又提示Empty set(0.00sec),想不通问题在哪里
后来发现,原来slave已经默认开启,要先关闭再开启
执行slave stop;
再执行
change master to master_host='192.168.1.222',master_user='repl',master_password='123456',master_log_file='log.000003',master_log_pos=98;
然后执行slave start;
这时再执行show slave status\G
显示如下:
***************************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
1row in set(0.00sec)
显示红色那两行,说明配置成功。
五、测试主从服务器是否能同步
在主服务器上面新建一个表,必须在repl数据下
mysql>use repl
Database changed
mysql>create table test(id int,name char(10));
Query OK,0rows affected(0.00sec)
mysql>insert into test values(1,'zaq');
Query OK,1row affected(0.00sec)
mysql>insert into test values(1,'xsw');
Query OK,1row affected(0.00sec)
mysql>select*from test;
+------+------+
id|name|
+-------+------+
1|zaq|
1|xsw|
+-------+------+
2rows in set(0.00sec)
在从服务器查看是否同步过来
mysql>use repl;
Database changed
mysql>select*from test;
+------+------+
id|name|
+------+------+
1|zaq|
1|xsw|
+------+------+
2rows in set(0.00sec)
说明已经配置成功。