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

我找到了解决办法

在触发命令之前:mysql_secure_installation

步骤1:sudo systemctl stop mariadb 步骤2:sudo systemctl启动mariadb 步骤3:mysql_secure_installation

然后它会询问根密码，你可以简单地按Enter并设置你的新根密码。

我不得不说:

sudo /etc/init.d/mysqld start

mysqld stop
mysql.server start

尝试重新启动服务器

sudo /usr/local/mysql/support-files/mysql.server start

如果出现任何错误，请按照以下步骤进行操作

mysqld

您将看到下面的日志。注意MySQL目录中突出显示的部分

mysqld: Can't change dir to '/usr/local/mysql-5.7.14-osx10.11-x86_64/data/' (Errcode: 13 - Permission denied) 2016-10-04T14:09:19.392581Z 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 2016-10-04T14:09:19.392847Z 0 [Warning] Insecure configuration for --secure-file-priv: Current value does not restrict location of generated files. Consider setting it to a valid, non-empty path. 2016-10-04T14:09:19.392921Z 0 [Note] mysqld (mysqld 5.7.14) starting as process 1402 ... 2016-10-04T14:09:19.397569Z 0 [Warning] Can't create test file /usr/local/mysql-5.7.14-osx10.11-x86_64/data/Sudharshan.lower-test 2016-10-04T14:09:19.397597Z 0 [Warning] Can't create test file /usr/local/mysql-5.7.14-osx10.11-x86_64/data/Sudharshan.lower-test 2016-10-04T14:09:19.397712Z 0 [ERROR] failed to set datadir to /usr/local/mysql-5.7.14-osx10.11-x86_64/data/ 2016-10-04T14:09:19.397776Z 0 [ERROR] Aborting 2016-10-04T14:09:19.397795Z 0 [Note] Binlog end 2016-10-04T14:09:19.397925Z 0 [Note] mysqld: Shutdown complete

sudo chown -R _mysql:_mysql /usr/local/mysql-5.7.14-osx10.11-x86_64

注意前面日志中的MySQL文件夹路径/usr/local，在我的例子中，它是MySQL -5.7.14-osx10.11-x86_64，您必须根据您在计算机上获得的日志更新它，以提供对MySQL目录的读访问

sudo /usr/local/mysql/support-files / mysql。服务器启动

启动MySQL 成功!

对我来说是:

打开/etc/mysql/my.cnf或/etc/my.cnf，搜索“bind-address”。结果是127.0.0.1。我将其转换为localhost，因此行结果应该是'bind-address = localhost'。

否则，你应该使用bind-address指令中存在的IP地址运行你的MySQL服务器，即MySQL -h 127.0.0.1。