mysql：unknown variable 'default-character-set=utf8'

1、修改my.cnf后，执行 service mysql restart 重启数据库失败

service mysql restart
Shutting down MySQL.. SUCCESS! 
Starting MySQL... ERROR! The server quit without updating PID file (/usr/local/mysql/data/VM_0_12_centos.pid)

2、查看日志：

cat VM_0_12_centos.err |grep ERROR
2018-02-27 22:33:50 923 [ERROR] /usr/local/mysql/bin/mysqld: unknown variable 'default-character-set=utf8'
2018-02-27 22:33:50 923 [ERROR] Aborting

3、很明显是没有default-character-set这个变量

4、查了下资料得知 character_set_server来取代 default-character-set

5、修改my.cnf。将default-character-set=utf8 换成character_set_server=utf8。重启数据库，启动成功。