[BUG] Unable to install Plesk Obsidian to CentOS7 with pre-installed MySQL server

Symptoms

Unable to install Plesk Obsidian on CentOS 7 with pre-installed MySQL server with the following error:

Package 1:mariadb-server-5.5.64-1.el7.x86_64 is obsoleted by mysql-community-server-5.7.29-1.el7.x86_64 which is already installed

Cause

Bug in Plesk with ID PPP-47540 which will be fixed in one of the future updates.

Resolution

As a workaround:

1. On a clean CentOS 7 server, install MySQL repository:

   # rpm -Uvh https://dev.mysql.com/get/mysql80-community-release-el7-1.noarch.rpm

2. Edit the file /etc/yum.repos.d/mysql-community.repo by enabling Mysql 5.7 and disabling Mysql 8.0

3. Install Mysql server

   # yum install mysql-community-server mysql-community-libs-compat

4. Start MySQL service:

   # service mysqld start

5. Install Plesk Onyx 17.8.11:

   # ./plesk-installer –select-product-id plesk –select-release-id PLESK_17_8_11 –installation-type Typical

6. Check that MySQL version is 5.7:

   # mysql –version
   mysql Ver 14.14 Distrib 5.7.29, for Linux (x86_64) using EditLine wrapper

7. Run Plesk installer and upgrade the installation to Plesk Obsidian