数据库已搭建完成，各种配置均已完成，但是在start slave ;的时候，报错：
ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO
这里说，我没有配置为从机，但我明明配置过的啊。
MySQL版本：5.6.19
主：master IP : 172.17.210.199
从：slave IP ：172.17.206.138
先看看从机172.17.206.138的my.cnf
[root@liuyazhuang ~]# vi /etc/my.cnf [mysqld] datadir=/usr/local/mysql/data socket=/tmp/mysql.sock skip-grant-tables user=mysql # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 tmpdir=/tmp [mysqld_safe] log-error=/usr/local/data/mysqld.log pid-file=/usr/local/mysql/data/mysqld.pid ###############以下是添加主从的配置 server_id = 2 log-bin = /usr/local/mysql/log/solve-bin.log master-host = 172.17.210.199 master-user = test master-pass = 123456 master-port = 3306 master-connect-retry = 60
这是MySQL主机172.17.210.199的my.cnf
[root@liuyazhuang ~]$ cat /etc/my.cnf [mysqld] log-bin = /u01/mysql/log/masters-bin.log read-only = 0 basedir = /u01/mysql datadir = /u01/mysql/data port = 3306 server_id = 1 socket = /tmp/mysql.sock join_buffer_size = 128M sort_buffer_size = 2M read_rnd_buffer_size = 2M sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
尝试过多次 重启主从还是报错;
接着手动chang to 后还是一样报错
mysql> CHANGE MASTER TO MASTER_HOST='172.17.210.199', MASTER_USER='test', MASTER_PASSWORD='123456', MASTER_LOG_FILE='masters-bin.000003', MASTER_LOG_POS=120; Query OK, 0 rows affected, 2 warnings (0.04 sec)
在从库服务器执行START slave;命令启动slave
mysql> START slave;
报错:
ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO
于是查看日志
1.查看SLAVE172.17.206.138上的Mysql报错日志，有这么一句：
141009 6:06:29 [ERROR] Server id not set, will not start slave
意思是，slave的server-id没有设置。
那就奇怪了，我明明在配置文件里面指定了server-id的了，并且有重启mysql服务，难道不起效？
分别在主从上执行命令“show variables like 'server_id';”。
-------从机上面查看端口
mysql> mysql> SHOW VARIABLES LIKE 'server_id'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id | 0 | +---------------+-------+ 1 row in set (0.00 sec)
命名设置的是2，怎么会变成0
-------主机上面查看
mysql> SHOW VARIABLES LIKE 'server_id'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id | 1 | +---------------+-------+ 1 row in set (0.00 sec)
跟设置的一样。
既然参数文件不生效，就试试在数据库命令里面设置：在从机 172.17.206.138上执行命令
mysql > SET GLOBAL server_id=2;
再次在从机 172.17.206.138上执行slave start和show slave status，成功了。
注意！！！由于“SET GLOBAL server_id=;”命令会在mysql服务重启后丢失，所以一定要写到配置文件里面。
但为什么我之前修改了my.cnf文件不起效？
仔细排查，发现配置里面有[mysqld]和[mysqld_safe]，之前将修改的配置内容基本都放在了[mysqld_safe]下面，新增的配置文件放的位置不一样也有关系？于是我尝试把配置文件里修改的部分放在[mysqld]下面，于是改成这样：
[root@liuyazhuang]# cat /etc/my.cnf [mysqld] datadir=/usr/local/mysql/data socket=/tmp/mysql.sock skip-grant-tables user=mysql symbolic-links=0 tmpdir=/tmp server_id = 2 log-bin = /usr/local/mysql/log/solve-bin.log master-host = 172.17.210.199 master-user = test master-pass = 123456 master-port = 3306 master-connect-retry = 60 [mysqld_safe] log-error=/usr/local/data/mysqld.log pid-file=/usr/local/mysql/data/mysqld.pid
如图，就是将图中标注的内容从[mysqld_safe]下修改到[mysqld]下
修改之后，再次同步，成功了！
mysql> mysql> STOP slave; Query OK, 0 rows affected (0.05 sec) mysql> START slave; Query OK, 0 rows affected (0.00 sec)
