Often database administrators need to uninstall MySQL completely in Ubuntu but are unable to do so. There are always certain files and settings left behind that get re-used when you re-install MySQL or install a different version of MySQL later. In this article, we will learn how to uninstall MySQL completely in Ubuntu.
How to Uninstall MySQL Completely in Ubuntu
Please note, when you uninstall MySQL server it will remove all your databases and configurations too. So please make sure to take a backup of important databases before you uninstall MySQL. You can take a backup of database using MySQLdump tool as shown below.
$ mysqldump -u username -ppassword database_name > /path/to/backup/file.sql
Here are the steps to uninstall MySQL completely in Ubuntu.
1. Stop MySQL Server
First step is to stop MySQL server. Open terminal and run the following command to stop MySQL server completely.
$ sudo systemctl stop mysql
2. Remove MySQL packages
Next, remove all MySQL-related packages completely.
$ sudo apt-get purge mysql-server mysql-client mysql-common mysql-server-core-* mysql-client-core-*
If the above command does not delete all MySQL related packages, you can also try the following command.
$ sudo apt-get remove --purge mysql*
3. Remove Configuration Files
By default, MySQL’s configuration files are located at /var/lib/mysql and /etc/mysql. While uninstalling MySQL, you also need to delete these files. If you have moved them then please replace these paths with the path to your MySQL configuration file, in the command below.
$ sudo rm -rf /etc/mysql /var/lib/mysql
4. (Optional) Remove Unnecessary Packages
You can optionally run the following commands to remove any unnecessary packages that were installed along with MySQL, and also to clear apt cache.
$ sudo apt autoremove $ sudo apt autoclean
In this article, we have learnt how to uninstall MySQL completely in Ubuntu. You can use them to make sure that all MySQL related files and packages are removed from your system, so that you can install it afresh later, if you want to.