<p>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：</p><p>ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO</p><p>这里说，我没有配置为从机，但我明明配置过的啊。</p><p>MySQL版本：5.6.19</p><p>主：master IP : 172.17.210.199</p><p>从：slave IP ：172.17.206.138</p><p>先看看从机172.17.206.138的my.cnf</p><pre class="brush:as3;toolbar:false">[root@liuyazhuang~]#vi/etc/my.cnf
[mysqld]
datadir=/usr/local/mysql/data
socket=/tmp/mysql.sock
skip-grant-tables
user=mysql
#Disablingsymbolic-linksisrecommendedtopreventassortedsecurityrisks
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</pre><p>这是MySQL主机172.17.210.199的my.cnf</p><pre class="brush:bash;toolbar:false">[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</pre><p>尝试过多次 重启主从还是报错;</p><p>接着手动chang to 后还是一样报错</p><pre class="brush:bash;toolbar:false">mysql>CHANGEMASTERTO
MASTER_HOST='172.17.210.199',
MASTER_USER='test',
MASTER_PASSWORD='123456',
MASTER_LOG_FILE='masters-bin.000003',
MASTER_LOG_POS=120;
QueryOK,0rowsaffected,2warnings(0.04sec)</pre><p>在从库服务器执行START slave;命令启动slave</p><pre class="brush:bash;toolbar:false">mysql>STARTslave;</pre><p><br/></p><p>报错:</p><p>ERROR 1200 (HY000): The server is not configured as slave; fix in config file or with CHANGE MASTER TO</p><p>于是查看日志</p><p>1.查看SLAVE172.17.206.138上的Mysql报错日志，有这么一句：</p><p>141009 6:06:29 [ERROR] Server id not set, will not start slave</p><p>意思是，slave的server-id没有设置。</p><p>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？</p><p>分别在主从上执行命令"show variables like 'server_id';"。</p><p>-------从机上面查看端口</p><pre class="brush:bash;toolbar:false">mysql>mysql>SHOWVARIABLESLIKE'server_id';
+---------------+-------+
|Variable_name|Value|
+---------------+-------+
|server_id|0|
+---------------+-------+
1rowinset(0.00sec)</pre><p>命名设置的是2，怎么会变成0</p><p>-------主机上面查看</p><pre class="brush:bash;toolbar:false">mysql>SHOWVARIABLESLIKE'server_id';
+---------------+-------+
|Variable_name|Value|
+---------------+-------+
|server_id|1|
+---------------+-------+
1rowinset(0.00sec)</pre><p>跟设置的一样。</p><p>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</p><pre class="brush:bash;toolbar:false">mysql>SETGLOBALserver_id=2;</pre><p>再次在从机 172.17.206.138上执行slave start和show slave status，成功了。</p><p> 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。</p><p>但为什么我之前修改了my.cnf文件不起效？</p><p>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：</p><pre class="brush:bash;toolbar:false">[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</pre><p><br/></p><p>如图，就是将图中标注的内容从[mysqld_safe]下修改到[mysqld]下</p><p><img src="/up_pic/201805/180931578191.jpg" title="180931578191.jpg" alt="1.jpg"/></p><p><img src="/up_pic/201805/180932029908.jpg" title="180932029908.jpg" alt="2.jpg"/></p><p>修改之后，再次同步，成功了！</p><pre class="brush:bash;toolbar:false">mysql>
mysql>STOPslave;
QueryOK,0rowsaffected(0.05sec)
mysql>STARTslave;
QueryOK,0rowsaffected(0.00sec)</pre>