根据我的经验，你需要先检查服务器是否正在运行，然后再尝试配置MySQL。最后一个解决方案是重新安装MySQL。

mysqld stop
mysql.server start

如果您的server/db工作正常，突然出现这个问题，那么只需重新启动您的db服务器。 对于Centos，我使用以下命令和我的问题“连接拒绝”“无法通过套接字连接到本地mysql”修复

sudo systemctl start mysqld

我的服务器上的简单解决方案:在使用MySQL数据库迁移到新的Debian 7服务器后，第二个本地IP地址127.0.1.1在我的hosts文件中丢失了。添加这个解决了警告:

echo -e "\n127.0.1.1       $(hostname)" >> /etc/hosts

This error can also occur if you try to change the directory where the database is stored, but imput the wrong directory in the configuration file (like a typo in the second drive as D instead of the accurate D_). Instead of telling you the typo directory does not exist, it will tell you that you lack permission to access it (leading you to try to change the permissions for the typo directory, which it will let you do). So if you get this error while changing directories, double check the configuration file and make sure you don't have a typo.

检查my.conf (/etc/mysql/my.cnf)，看看bind-address是否设置为127.0.0.1。

如果不是，这可能会导致此问题。