MySQL搭建主从报错“The server is not configured as slave“怎么解决

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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@testmysql ~]# 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 = my
master-pass = 123456
master-port = 3306
master-connect-retry = 60

这是 MySQL 主机 172.17.210.199 的 my.cnf
[oracle@newbidb ~]$ 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= my ,
MASTER_PASSWORD= 123456 ,
MASTER_LOG_FILE= masters-bin.000003 ,
MASTER_LOG_POS=120;
Query OK, 0 rows affected, 2 warnings (0.04 sec)

mysql START slave;
ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO
mysql SHOW slave STATUS \G
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 172.17.210.199
Master_User: my
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: masters-bin.000003
Read_Master_Log_Pos: 120
Relay_Log_File: testmysql-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File: masters-bin.000003
Slave_IO_Running: No
Slave_SQL_Running: No
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: 120
—————- 略

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”。

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]，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改成这样：
/etc/my.cnf 24L, 467C written
[root@testmysql mysql]# 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 = my
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

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)

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