mysql 主从 配置

ubuntu下的mysql主从配置:

说明:由于MySQL不同版本之间的(二进制日志)binlog格式可能会不一样,因此最好的搭配组合是Master的MySQL版本和Slave的版本相同或者更低,
Master的版本肯定不能高于Slave版本。(版本向下兼容)

mysql1  : 129.1.23.8    //master
mysql2  : 129.1.23.246  //slave

安装步骤
1. 分别在两台机器上安装mysql-server
shell > apt-get install mysql-server
2.修改 mysql1 master 的配置文件
vim /etc/mysql/my.cnf
找到 bind-address = 127.0.0.1
改为 bind-address = 0.0.0.0
找到
#server-id               = 1
#log_bin                 = /var/log/mysql/mysql-bin.log
去掉 注释符号
server-id               = 1
log_bin                 = /var/log/mysql/mysql-bin.log
default-character-set   = utf8     #新加上的为了保持编码一至防止出错

3.改好后保存退出,然后建立一个slave服务器的用户账号

root@msyql1:/# mysql -uroot -p

mysql>  grant replication slave,replication client on *.* to slave@192.168.157.142 identified by ‘12345678’;
mysql >  grant replication slave on *.* to slave@192.168.157.142 identified by ‘12345678’;     //给予权限
到这里要注意了,我的两台数据库都是空的.

重启mysql服务

4.修改 mysql2 服务器slave的 my.cnf配置文件
找到 bind-address            = 127.0.0.1
替换 bind-address            = 0.0.0.0
找到
#server-id               = 1
#log_bin                 = /var/log/mysql/mysql-bin.log
把 注释符号去掉 改为如下

server-id               = 2
master-host             = 129.1.10.3
master-user             = slave
master-password         = ******
master-port             = 3306
log_bin                 = /var/log/mysql/mysql-bin.log
log-slave-updates
skip-slave-start

//add
master-connect-retry=60 #如果从服务器发现主服务器断掉,重新连接的时间差(秒)
replicate-do-db =test #只复制某个库
replicate-ignore-db=mysql #不复制某个库
配置完后 重新启动mysql

然后进入 mysql1 master 服务器
root@msyql:~# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 9
Server version: 5.0.51a-3ubuntu5.4-log (Ubuntu)

Type ‘help;’ or ‘h’ for help. Type ‘c’ to clear the buffer.

mysql> show master status;

记录下来以后 进入 mysql2 slave mysql

root@msyql2:~# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 9
Server version: 5.0.51a-3ubuntu5.4-log (Ubuntu)

Type ‘help;’ or ‘h’ for help. Type ‘c’ to clear the buffer.
mysql>  change master to master_log_file=’mysql-bin.000009′, master_log_pos=106;

//这个地方就是记录下来的 mysql1 master 的数据***********************************

mysql > start slave;  //启动slave 服务

mysql > show slave statusG
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 129.1.23.8
Master_User: sx
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 884
Relay_Log_File: mysqld-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: No
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: 884
Relay_Log_Space: 106
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: NULL
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
1 row in set (0.00 sec)

这一块有一个错误:             Slave_IO_Running: No
Slave_SQL_Running: Yes

正常的话,应该是这样的:
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

Slave_IO_Running: No
解决办法:
先stop slave 再reset slave再start slave就正常了。

Slave_SQL_Running: No
解决办法:
1.首先停掉Slave服务:slave stop
2.到主服务器上查看主机状态:记录File和Position对应的值。
3.到slave服务器上执行手动同步:
change master to master_host=’192.168.157.143′, master_user=’slave’, master_password=’12345678′, master_port=3306, master_log_file=’mysql-bin.000013′, master_log_pos=106;
slave start
show slave statusG;

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