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Failed to start SYSV: MySQL database server…的解决方法
问题：
在虚拟机中安装MYSQL，重启虚拟机后MYSQL启动报错

[root@server1 ~]# systemctl start mysqld
Job for mysqld.service failed because the control process exited with error code. See "systemctl status mysqld.service" and "journalctl -xe" for details.

查看日志：

journalctl -xe
cat /var/log/mysqld

解决：建立缺少的目录

mkdir -p /var/run/mysqld
systemctl start mysqld

此是还是无法启动，修改目录权限

chown mysql.mysql /var/run/mysqld/
systemctl start mysqld

启动成功