我在Ubuntu上有这个，正如我所发现的，有不止一个mysqld实例。

看起来上一个还没有完全停止，而新的已经开始了。运行/ etc / init。d/mysql stop'没有帮助，它总是返回'OK'，并且在那之后会自动启动一个新实例:

        $ sudo /etc/init.d/mysql stop
         * Stopping MySQL database server mysqld        [ OK ] 
        $ pgrep mysql
        28315
        $ sudo /etc/init.d/mysql stop
         * Stopping MySQL database server mysqld        [ OK ] 
        $ pgrep mysql
        28570
        $ sudo /etc/init.d/mysql stop
         * Stopping MySQL database server mysqld        [ OK ] 
        $ pgrep mysql
        28763
        ..... etc ...

幸运的是，下面的命令已经解决了这个问题:

    $ sudo service mysql stop
    mysql stop/waiting

    $ ps -ef | grep mysql
    29841 26858  0 10:59 pts/8    00:00:00 grep --color=auto mysql <--- IT's gone ! 

之后，我能够再次启动mysql，并看到mysql。Sock已经创建成功。

适用于CentOS Linux发行版7.3 mysql。Sock文件路径为/var/lib/mysql/mysql.sock

编辑/etc/my.cnf文件并放入下面的条目 这将解决你的问题。

[client]
user=root
password=Passw0rd
port=3306
socket=/var/lib/mysql/mysql.sock
[mysqld]
bind-address=0.0.0.0

在此之后重新启动服务

service mysql restart

在我的情况下，似乎我不能真正杀死mysql进程，当我运行

sudo service mysql stop
ps -ef | grep mysql

mysql进程一直在那里，看起来它阻塞了套接字文件，新的mysql进程不能自己创建它。

这很有帮助

cd /var/run
sudo cp mysqld/ mysqld.bc -rf
sudo chown mysql:mysql mysqld.bc/
sudo service mysql stop
sudo cp mysqld.bc/ mysqld -rf
sudo chown mysql:mysql mysqld -R
sudo /usr/sbin/mysqld --skip-grant-tables --skip-networking &

现在我能够登录数据库使用

mysql -u root

然后更新root密码:

UPDATE user SET authentication_string=password('YOURPASSWORDHERE') WHERE user='root';
FLUSH PRIVILEGES;

PS:我在更新根密码时遇到了麻烦，似乎是“auth_socket”插件的问题，所以我必须创建具有完整权限的新用户

insert into user set `Host` = "localhost", `User` = "super", `plugin` = "mysql_native_password", `authentication_string` = NULL, `password_expired` = "N", `password_lifetime` = NULL, `account_locked` = "N", `Select_priv` = "Y",
`Insert_priv` = "Y", `Update_priv` = "Y", `Delete_priv` = "Y", `Create_priv` = "Y", `Drop_priv` = "Y", `Reload_priv` = "Y", `Shutdown_priv` = "Y", `Process_priv` = "Y", `File_priv` = "Y",
`Grant_priv` = "Y",  `References_priv` = "Y", `Index_priv` = "Y", `Alter_priv` = "Y", `Show_db_priv` = "Y", `Super_priv` = "Y", `Create_tmp_table_priv` = "Y", `Lock_tables_priv` = "Y",
`Execute_priv` = "Y", `Repl_slave_priv` = "Y",  `Repl_client_priv` = "Y",  `Create_view_priv` = "Y", `Show_view_priv` = "Y", `Create_routine_priv` = "Y", `Alter_routine_priv` = "Y",
`Create_user_priv` = "Y",  `Event_priv` = "Y", `Trigger_priv` = "Y", `Create_tablespace_priv` = "Y";

这将创建一个没有密码的用户“super”，然后你可以连接mysql -u super

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.

而不是使用localhost:

mysql -u myuser -pmypassword -h localhost mydatabase

使用127.0.0.1

mysql -u myuser -pmypassword -h 127.0.0.1 mydatabase

(注意，-p和mpassword之间没有空格)

享受:)

我也遇到了同样的问题，问题是mysql服务器已经安装，但它没有运行。

试, 启动mysql服务 或 启动mysql