对于mysql 5.6，这个命令有效，你可以通过向导设置密码:

sudo dpkg-reconfigure mysql-server-5.6

I had to go this route on Ubuntu 16.04.1 LTS. It is somewhat of a mix of some of the other answers above - but none of them helped. I spent an hour or more trying all other suggestions from MySql website to everything on SO, I finally got it working with: Note: while it showed Enter password for user root, I didnt have the original password so I just entered the same password to be used as the new password. Note: there was no /var/log/mysqld.log only /var/log/mysql/error.log Also note this did not work for me: sudo dpkg-reconfigure mysql-server-5.7 Nor did: sudo dpkg-reconfigure --force mysql-server-5.5 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 Then:

kill the current mysqld pid run mysqld with sudo /usr/sbin/mysqld & run /usr/bin/mysql_secure_installation Output from mysql_secure_installation root@myServer:~# /usr/bin/mysql_secure_installation Securing the MySQL server deployment. Enter password for user root: VALIDATE PASSWORD PLUGIN can be used to test passwords and improve security. It checks the strength of password and allows the users to set only those passwords which are secure enough. Would you like to setup VALIDATE PASSWORD plugin? Press y|Y for Yes, any other key for No: no Using existing password for root. Change the password for root ? ((Press y|Y for Yes, any other key for No) : y New password: Re-enter new password: By default, a MySQL installation has an anonymous user, allowing anyone to log into MySQL without having to have a user account created for them. This is intended only for testing, and to make the installation go a bit smoother. You should remove them before moving into a production environment. Remove anonymous users? (Press y|Y for Yes, any other key for No) : y Success. Normally, root should only be allowed to connect from 'localhost'. This ensures that someone cannot guess at the root password from the network. Disallow root login remotely? (Press y|Y for Yes, any other key for No) : y Success. By default, MySQL comes with a database named 'test' that anyone can access. This is also intended only for testing, and should be removed before moving into a production environment. Remove test database and access to it? (Press y|Y for Yes, any other key for No) : y Dropping test database... Success. Removing privileges on test database... Success. Reloading the privilege tables will ensure that all changes made so far will take effect immediately. Reload privilege tables now? (Press y|Y for Yes, any other key for No) : y Success. All done!

官方和简单的方法来重置根密码在ubuntu服务器…

如果你在16.04 14.04 12.04

sudo dpkg-reconfigure mysql-server-5.5

如果你在10.04:

sudo dpkg-reconfigure mysql-server-5.1

如果您不确定安装了哪个mysql-server版本，您可以尝试:

dpkg --get-selections | grep mysql-server

mysql-server-5.7的更新说明

请注意，如果您使用的是mysql-server-5.7，则不能使用上面所示的更简单的dpkg-reconfigure方法。

如果你知道密码，登录并运行这个:

UPDATE mysql.user SET authentication_string=PASSWORD('my-new-password') WHERE USER='root';
FLUSH PRIVILEGES;

或者，您可以使用以下方法:

sudo mysql_secure_installation

这将询问您一系列关于保护安装的问题(强烈推荐)，包括是否需要提供新的根密码。

如果你不知道root密码，请参考这个以ubuntu为中心的进程写上去。

查看更多信息:

https://help.ubuntu.com/16.04/serverguide/mysql.html https://help.ubuntu.com/14.04/serverguide/mysql.html

要更新“root”Mysql用户密码，你必须记住，你将需要超级用户权限。如果您拥有超级用户权限，请尝试执行以下命令:

MySQL 5.7.6及以上版本

sudo su
service mysql stop
mysql -u root
ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';
\q;
exit
mysql -u root -p MyNewPass

MySQL 5.7.5及更早版本

sudo su
service mysql stop
mysql -u root
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('MyNewPass');
\q;
exit
mysql -u root -p MyNewPass

Instead of resetting the password there is a work around on the local machine if you have setup phpmyadmin to connect without giving the password or username. Check this out by starting mysql, apache etc. I have xampp installed in my local machine. So starting the xampp will start all the necessary services. Now going to http://localhost/phpmyadmin shows me all the databases. This confirms that you have saved the username and passsword in the config file of phpmyadmin which can be found in the phpmyadmin install location. If you have xampp installed the phpmyadmin folder can be found in the root folder of xampp installation. Search for the word password in the config.inc.php file. There you will find the password and username.

当你在你想要更改密码的系统上使用MySQL的PASSWORD()时，它可能会导致密码在MySQL日志中以cleartext [source]显示。对我来说，让它们和备份等像密码一样安全听起来像是噩梦，所以我喜欢这样做:

On your local machine, run this with your password: mysql -u someuser -p < <(echo "SELECT PASSWORD('mypass');") Note the space in front to prevent it from turning up in the bash history (for other distros than Ubuntu, this might work differently – source). On your server machine, execute the following command to change its MySQL root password (replace myhash with your password's hash as printed by the first command): mysql -u root -p < <(echo "SET PASSWORD FOR root@localhost = 'myhash';") Optionally, let's be a bit paranoid: On your local machine, clear your terminal screen with clear and purge your virtual terminal scrollback, to hide the cleartext password appearing in the command above.