Tutorial on uninstalling MySQL database instance under Linux

This article mainly introduces the method of uninstalling the MySQL database under Linux. Friends who do not know how to uninstall the MySQL database under Linux can learn about it. This article has certain reference value and I hope it can help everyone.

How to uninstall the MySQL database under Linux? The following summarizes and organizes the methods of uninstalling MySQL on the Linux platform. There are three main ways to install MySQL: binary package installation (Using Generic Binaries), RPM package installation, and source code installation. Corresponding to different installation methods, the uninstallation steps are slightly different. If there are any deficiencies or errors in the article, please point it out or add to it!

MySQL uninstallation using RPM package installation method

1. Check whether the MySQL component is installed.

[root@DB-Server init.d]# rpm -qa | grep -i mysql
MySQL-devel-5.6.23-1.linux_glibc2.5
MySQL-client-5.6.23-1.linux_glibc2.5 
MySQL-server-5.6.23-1.linux_glibc2.5

As shown above, it means that the three components of client, server and devel of MySQL 5.6.23 version are installed. .

2. Close the MySQL service before uninstalling

2.1 Method 1

[root@DB-Server init.d]# service mysql status
 MySQL running (25673)[ OK ]
[root@DB-Server init.d]# service mysql stop
 Shutting down MySQL..[ OK ]
[root@DB-Server init.d]# service mysql status
 MySQL is not running[FAILED]

2.2 Method 2

[root@DB-Server init.d]# ./mysql status
 MySQL running (26215)[ OK ]
[root@DB-Server init.d]# ./mysql stop
 Shutting down MySQL..[ OK ]
[root@DB-Server init.d]# ./mysql status
 MySQL is not running[FAILED]
[root@DB-Server init.d]#

##

[root@DB-Server init.d]# chkconfig --list | grep -i mysql
mysql 0:off 1:off 2:on 3:on 4:on 5:on 6:off 
[root@DB-Server init.d]#

3. Collect the folder information corresponding to MySQL

[root@DB-Server init.d]# whereis mysql

mysql: /usr/bin/mysql /usr/include/mysql /usr/share/mysql /usr/share/man/man1 /mysql.1.gz

It is best to use the find command to view the files related to the MySQL database so that you can completely delete MySQL later.

[root@DB-Server init.d]# find / -name mysql
/etc/rc.d/init.d/mysql
/etc/logrotate.d/mysql
/var/lock/subsys/mysql
/var/lib/mysql
/var/lib/mysql/mysql
/usr/include/mysql
/usr/include/mysql/mysql
/usr/bin/mysql
/usr/share/mysql
/usr/lib64/mysql

4. Uninstall and delete various MySQL components

[root@DB-Server init.d]# 
[root@DB-Server init.d]# rpm -ev MySQL-devel-5.6.23-1.linux_glibc2.5
[root@DB-Server init.d]# rpm -ev MySQL-server-5.6.23-1.linux_glibc2.5
You have new mail in /var/spool/mail/root
[root@DB-Server init.d]# rpm -ev MySQL-client-5.6.23-1.linux_glibc2.5
[root@DB-Server init.d]#

5. Delete the folder corresponding to MySQL

Check whether each MySQL folder is clean and deleted.

[root@DB-Server init.d]# whereis mysql
mysql:
[root@DB-Server init.d]# find / -name mysql
/var/lib/mysql
/var/lib/mysql/mysql
/usr/lib64/mysql
[root@DB-Server init.d]# rm -rf /var/lib/mysql
[root@DB-Server init.d]# rm -rf /var/lib/mysql/mysql
[root@DB-Server init.d]# rm -rf /usr/lib64/mysql
[root@DB-Server init.d]#

6. Delete the mysql user and user group

If necessary, delete the mysql user and mysql user group.

[root@DB-Server ~]# more /etc/passwd | grep mysql
mysql:x:101:501::/home/mysql:/bin/bash
[root@DB-Server ~]# more /etc/shadow | grep mysql
mysql:!!:16496::::::
[root@DB-Server ~]# more /etc/group | grep mysql
mysql:x:501:
[root@DB-Server ~]# userdel mysql
[root@DB-Server ~]# groupdel mysql
groupdel: group mysql does not exist
[root@DB-Server ~]#

7. Confirm whether MySQL is uninstalled and deleted.

[root@DB-Server init.d]# rpm -qa | grep -i mysql

binary package/source code installation method of MySQL Uninstall

If MySQL is installed using a binary package, you will not be able to find any MySQL components using the following command. So if you don’t know how to install MySQL, never use the following command to determine whether MySQL is installed

[root@DB-Server init.d]# rpm -qa | grep -i mysql

1. Check the MySQL service and close the service process.

First check the status of the MySQL service through the process. As shown below, the MySQL service is started.

[root@DB-Server init.d]# ps -ef | grep mysql
root   4752 4302 0 22:55 pts/1  00:00:00 more /etc/init.d/mysql.server
root   7176   1 0 23:23 pts/1  00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/usr/local/mysql/data --pid-file=/usr/local/mysql/data/DB-Server.localdomain.pid
mysql   7269 7176 15 23:23 pts/1  00:00:01 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/usr/local/mysql/data/DB-Server.localdomain.err --pid-file=/usr/local/mysql/data/DB-Server.localdomain.pid
root   7321 4302 0 23:23 pts/1  00:00:00 grep mysql
[root@DB-Server init.d]# /etc/init.d/mysql.server status
MySQL running (7269)[ OK ]
[root@DB-Server init.d]# /etc/init.d/mysql.server stop
Shutting down MySQL..[ OK ]
[root@DB-Server init.d]# /etc/init.d/mysql.server status
MySQL is not running[FAILED]
[root@DB-Server init.d]#

2. Find the MySQL installation directory and delete it completely

[root@DB-Server init.d]# whereis mysql
 mysql: /usr/local/mysql
 [root@DB-Server init.d]# find / -name mysql
 /var/spool/mail/mysql
 /usr/local/mysql-5.7.5-m15-linux-glibc2.5-x86_64/include/mysql
 /usr/local/mysql-5.7.5-m15-linux-glibc2.5-x86_64/bin/mysql
 /usr/local/mysql-5.7.5-m15-linux-glibc2.5-x86_64/data/mysql
 /usr/local/mysql

[root@DB-Server init.d]# rm -rf /usr/local/mysql-5.7.5-m15-linux-glibc2.5-x86_64/ 
[root@DB-Server init.d]# rm -rf /usr/local/ 
[root@DB-Server init.d]# rm -rf /var/spool/mail/mysql 
[root@DB-Server init.d]#

3. Delete some configuration files. Configuration files generally include /etc/my.cnf or /etc/init.d/ mysql.server, depending on the specific installation and configuration.

4. Delete MySQL users and user groups

[root@DB-Server ~]# id mysql 
uid=101(mysql) gid=501(mysql) groups=501(mysql) context=root:system_r:unconfined_t:SystemLow-SystemHigh 
[root@DB-Server ~]# userdel mysql

Reference materials:

Detailed explanation of completely uninstalling mysql under Linux

Related recommendations:

Complete steps to uninstall the MySQL database (picture)

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