mysql开启bin_log后无法启动问题解决

问题：mysql需要开启bin_log权限，配置文件添加之后mysql无法启动

修改内容：

#编辑mysql配置文件
#vi /etc/
#添加内容：
log_bin=mysql_bin
binlog_format=ROW

添加之后重启mysql启动失败：

#systemctl restart mysqld

查看状态：

#systemctl status mysqld

提示：start request repeated too quickly for

查看日志文件中没有信息提示

解决方法：在配置文件中添加server_id字段

log_bin=mysql_bin
binlog_format=ROW
server_id=2

添加之后重启服务，mysql启动成功

进入mysql 

# mysql
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 28
Server version: 5.7.18-log MySQL Community Server (GPL)

Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show variables like 'log_bin';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| log_bin       | ON    |
+---------------+-------+
1 row in set (0.00 sec)

mysql> exit

log_bin开启成功。

原因解析（server_id作用）：

添加bin_log的主要目的是用于数据库同步， mysql的同步的数据中是包含server-id的，用于标识该语句最初是从哪个server写入的，所以server-id一定要有的。