在Ubuntu 16.04 (Xenial Xerus)和MySQL 5.7.13版本中，我能够通过以下步骤解决这个问题:

Follow the instructions from section B.5.3.2.2 Resetting the Root Password: Unix and Unix-Like Systems MySQL 5.7 reference manual When I tried #sudo mysqld_safe --init-file=/home/me/mysql-init & it failed. The error was in /var/log/mysql/error.log: 2016-08-10T11:41:20.421946Z 0 [Note] Execution of init_file '/home/me/mysql/mysql-init' started. 2016-08-10T11:41:20.422070Z 0 [ERROR] /usr/sbin/mysqld: File '/home/me/mysql/mysql-init' not found (Errcode: 13 - Permission denied) 2016-08-10T11:41:20.422096Z 0 [ERROR] Aborting

mysql-init的文件权限不是问题。我们需要编辑AppArmor权限。

Edit by sudo vi /etc/apparmor.d/usr.sbin.mysqld .... /var/log/mysql/ r, /var/log/mysql/** rw, # Allow user init file /home/pranab/mysql/* r, # Site-specific additions and overrides. See local/README for details. #include <local/usr.sbin.mysqld> } Do sudo /etc/init.d/apparmor reload Start mysqld_safe again. Try step 2 above. Check file /var/log/mysql/error.log. Make sure there is no error and the mysqld is successfully started. Run mysql -u root -p Enter password: Enter the password that you specified in mysql-init. You should be able to log in as root now. Shutdown mysqld_safe by sudo mysqladmin -u root -p shutdown Start mysqld the normal way by sudo systemctl start mysql

如果问题仍然存在，请尝试强制修改密码:

/etc/init.d/mysql stop

mysqld_safe --skip-grant-tables &

mysql -u root

设置新的MySQL root用户密码:

use mysql;
update user set password=PASSWORD("NEW-ROOT-PASSWORD") where User='root';
flush privileges;
quit;

停止MySQL服务器:

/etc/init.d/mysql stop

启动MySQL服务器并测试它:

mysql -u root -p

当您的密码丢失时就会发生这种情况。

忘记密码时的修改步骤:

Stop MySQL Server (on Linux): sudo systemctl stop mysql Start the database without loading the grant tables or enabling networking: sudo mysqld_safe --skip-grant-tables --skip-networking & The ampersand at the end of this command will make this process run in the background, so you can continue to use your terminal and run mysql -u root (as root). It will not ask for a password. If you get error like as below: 2018-02-12T08:57:39.826071Z mysqld_safe Directory '/var/run/mysqld' for UNIX socket file don't exists. mysql -u root ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) [1]+ Exit 1 Make MySQL service directory. sudo mkdir /var/run/mysqld Give MySQL user permission to write to the service directory. sudo chown mysql: /var/run/mysqld Run the same command in step 2 to run MySQL in background. Run mysql -u root. You will get the MySQL console without entering a password. Run these commands FLUSH PRIVILEGES; For MySQL 5.7.6 and newer ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password'; For MySQL 5.7.5 and older SET PASSWORD FOR 'root'@'localhost' = PASSWORD('new_password'); If the ALTER USER command doesn't work use: UPDATE mysql.user SET authentication_string = PASSWORD('new_password') WHERE User = 'root' AND Host = 'localhost'; Now exit To stop the instance started manually: sudo kill `cat /var/run/mysqld/mysqld.pid` Restart MySQL sudo systemctl start mysql

如果其他答案都不适合您，并且您收到了以下错误:

mysqld_safe Logging to '/var/log/mysql/error.log'.
mysqld_safe Directory '/var/run/mysqld' for UNIX socket file don't exists.
[1]+  Exit 1                  sudo mysqld_safe --skip-grant-tables

按照以下命令依次执行，直到重置密码:

# Stop your server first
sudo service mysql stop

# Make the MySQL service directory.
sudo mkdir /var/run/mysqld

# Give MySQL permission to work with the created directory
sudo chown mysql: /var/run/mysqld

# Start MySQL, without permission and network checking
sudo mysqld_safe --skip-grant-tables --skip-networking &

# Log in to your server without any password.
mysql -u root mysql


# Update the password for the root user:
UPDATE mysql.user SET authentication_string=PASSWORD('YourNewPasswordBuddy'), plugin='mysql_native_password' WHERE User='root' AND Host='localhost';

# If you omit (AND Host='localhost') section, it updates
# the root password regardless of its host

FLUSH PRIVILEGES;
EXIT;

# Kill the mysqld_safe process
sudo service mysql restart

# Now you can use your new password to log in to your server
mysql -u root -p

# Take note for remote access. You should create a remote
# user and then grant all privileges to that remote user

在my.cnf文件的底部添加以下两行代码:

[mysqld]    
skip-grant-tables    

这应该有用。

我所面临的错误是:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

这是一个端口运行的问题。

默认情况下，MySQL运行在3306端口上。

你可以通过运行来检查

在32位系统中: sudo / opt / lampp / manager-linux.run 在64位系统中: sudo / opt / lampp / manager-linux-x64.run

然后点击Configure按钮。

在我的示例中，端口运行在3307上，我使用了该命令

mysql -u root -p -P 3307 -h 127.0.0.1