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centos下MySQL主从同步配置

时间:2021-07-01 10:21:17 帮助过:4人阅读

centos下MySQL主从同步配置 一、环境 主机: master操作系统:centos 5.3 IP:192.168.1.222 MySQL版本:5.0.77 从机: slave操作系统:centos 5.3 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

centos下MySQL主从同步配置
一、环境

主机:

master操作系统:centos 5.3

IP:192.168.1.222

MySQL版本:5.0.77

从机:

slave操作系统:centos 5.3

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' identifiedby '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 |

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

1 row in set (0.00 sec)


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 statusG;
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

问题1 当我在执行start slave这条命令时,系统提示

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

执行show slave status;又提示Empty set (0.00 sec),想不通问题在哪里

或问题2 Slave_SQL_Running: No


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 tomaster_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 statusG

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

1 row in set (0.00 sec)

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,namechar(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 |

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

2 rows in set (0.00 sec)



解决办法II:
mysql> slave stop;
mysql> set GLOBAL SQL_SLAVE_SKIP_COUNTER=1;
mysql> slave start;



Slave_IO_Running: No

1.mysql> reset slave; # 重点就是这行
2.mysql> change master to master_host='192.168.1.199', master_user='apk_service', master_password='123456', master_log_file='mysql-bin.000042', master_log_pos=366;; # 请依照自行环境设定
3.mysql> start slave; # 就正常了.

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