MySQL not starting after upgrade to version 10.2.31-3.25.1

This document (000015903) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 12 SP4
SUSE Linux Enterprise Server 12 SP5

Situation

After upgrading MySQL package to version 10.2.31-3.25.1, following error message might appear:

mysql-systemd-helper[39097]: Creating MySQL privilege database...
mysql-systemd-helper[39097]: mkdir: cannot create directory ‘/home/mysql’: Read-only file system
mysql-systemd-helper[39097]: Fatal error Can't create database directory '/home/mysql'
mysql-systemd-helper[39097]: The latest information about mysql_install_db is available at
mysql-systemd-helper[39097]: https://mariadb.com/kb/en/installing-system-tables-mysql_install_db
mysql-systemd-helper[39097]: Creation of MySQL databse in /home/mysql failed
systemd[1]: mariadb.service: Control process exited, code=exited status=1
systemd[1]: Failed to start MySQL server.
systemd[1]: mariadb.service: Unit entered failed state.
systemd[1]: mariadb.service: Failed with result 'exit-code'.

Resolution

Modify /usr/lib/systemd/system/mariadb.service changing this:

ProtectHome=true

to this:

ProtectHome=false

Restart systemd daemon with

systemctl daemon-reload

Cause

New version of MySQL contains a couple of new features:

- ProtectSystem=full (prevent writes to /usr, /etc and etc)
- ProtectHome=true (prevent accessing /home, /root/, /run/user)
- PremissionsStartOnly=true (only pre/post scripts are run as root)

Status

Reported to Engineering

Disclaimer

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