Completely remove MariaDB or MySQL from CentOS 7 or RHEL 7

  installed MariaDB on CentOS 7 but I had some problems with some configuration, now it is completely misconfigured.

Thus, I wanted to remove the MariaDB with “yum remove mariadb mariadb-server”, after that I reinstalled it with “yum install mariadb mariadb-server”.

Unfortunately, the configuration remains. It seems as if yum remove don’t delete all MariaDB Config-Files.

How can I remove MariaDB completely from CentOS 7?

Comments


  1. rm -rf /var/lib/mysql If your datadir in /etc/my.cnf points to a different directory, remove that directory instead of /var/lib/mysql
    rm /etc/my.cnf the file might have already been deleted at step 1
    Optional step: rm ~/.my.cnf
    yum install mariadb mariadb-server
    [EDIT] - Update for MariaDB 10.1 on CentOS 7

    The steps above worked for CentOS 6.5 and MariaDB 10.

    I've just installed MariaDB 10.1 on CentOS 7 and some of the steps are slightly different.

    Step 1 would become:

    yum remove MariaDB-server MariaDB-client
    Step 5 would become:

    yum install MariaDB-server MariaDB-client
    The other steps remain the same.

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  2. To update and answer the question without breaking mail servers. Later versions of CentOS 7 have MariaDB included as the base along with PostFix which relies on MariaDB. Removing using yum will also remove postfix and perl-DBD-MySQL. To get around this and keep postfix in place, first make a copy of /usr/lib64/libmysqlclient.so.18 (which is what postfix depends on) and then use:

    rpm -qa | grep mariadb
    then remove the mariadb packages using (changing to your versions):

    rpm -e --nodeps "mariadb-libs-5.5.56-2.el7.x86_64"
    rpm -e --nodeps "mariadb-server-5.5.56-2.el7.x86_64"
    rpm -e --nodeps "mariadb-5.5.56-2.el7.x86_64"
    Delete left over files and folders (which also removes any databases):

    rm -f /var/log/mariadb
    rm -f /var/log/mariadb/mariadb.log.rpmsave
    rm -rf /var/lib/mysql
    rm -rf /usr/lib64/mysql
    rm -rf /usr/share/mysql
    Put back the copy of /usr/lib64/libmysqlclient.so.18 you made at the start and you can restart postfix.

    There is more detail at https://code.trev.id.au/centos-7-remove-mariadb-replace-mysql/ which describes how to replace mariaDB with MySQL

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