关于终端中输入airflow webserver,出现打不开的问题如何解决？

1.出现问题：

sqlalchemy.exc.OperationalError: (_mysql_exceptions.OperationalError) (2002, "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)") (Background on this error at: http://sqlalche.me/e/e3q8)

2.当我们打开mysql时，~$ mysql -uroot -p123456

会出现的错误：

mysql: [Warning] Using a password on the command line interface can be insecure.

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)

原因：是因为自己的mysql服务器没有启动

解决的方法：~$ sudo /etc/init.d/mysql restart 

[ ok ] Restarting mysql (via systemctl): mysql.service.