A few months ago, I had setup LAMP stack in Ubuntu 18.04 server. Today, I tried to login as root user in my database server, but I completely forgot the password. After couple web searches and going through MySQL forum, I successfully reset MySQL root user password. For those wondering how to do this, this brief tutorial explains the steps to reset MySQL or MariaDB Root password in Linux and Unix-like operating systems.
Reset MySQL or MariaDB Root password
First, stop the database server.
If you use MySQL, type the following command and hit ENTER key.
$ sudo systemctl stop mysql
$ sudo systemctl stop mariadb
Next, restart the database server without permission-checking using the following command:
$ sudo mysqld_safe --skip-grant-tables &
--skip-grant-tablesoption allows you to connect without a password and with all privileges.
If you start your server with this option, it also enables
--skip-networkingoption which is used to prevent the other clients from connecting to the database server.
And, the ampersand (&) symbol is used to run the command in background, so you could type the other commands in the following steps.
Please be mindful that the above command is dangerous and your database server becomes insecure. You should run this command only for a brief period of time to reset the password.
Next, login to your MySQL/MariaDB server as
MariaDB [(none)]> prompt, run the following command to reset the database
root user password:
UPDATE mysql.user SET Password=PASSWORD('ostechnix') WHERE User='root';
Replace ostechnix in the above command with your own password.
Then, type following commands to exit from the mysql console.
Finally, shutdown the running database server that you started earlier with
--skip-grant-tables option. To do so, run:
$ sudo mysqladmin -u root -p shutdown
You will be asked to enter your mysql/mariadb
root user password that you set in the previous step.
Enter password: - Done sudo mysqld_safe --skip-grant-tables
Now, start mysql/mariadb service normally using command:
$ sudo systemctl start mysql
$ sudo systemctl start mariadb
Verify if the password has really been changed using the following command:
$ sudo mysql -u root -p
And, that's all for now. Hope you find this useful.
By mariadb 10 (10.0.38-0ubuntu0.16.04.1) this no longer works as expected. Password is set in the mysql.user database but (1) as root it pays no attention to the password, you can type anything or nothing at the password prompt and you can log in and (2) as any other user ‘mysql -u root -p’ rejects the password.
Run ‘ sudo mysql -u root -p ‘ instead of ‘ mysql -u root -p ‘
It should work
The changes about the root user authentication are explained at:
in particular: “Using unix_socket means that if you are the system root user, you can login as root@locahost without a password. ”
— that is, if you run the login as the root user, which is why “sudo mysql -u root ” is necessary on Ubuntu/Debian style systems, etc.