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Knowledge Base

Unable to start MySQL/MariaDB after upgrading it on a Plesk for Linux server: Unknown/unsupported storage engine: InnoDB

 
databasedatabase serverfeedbackinstallation upgradelinux

Applicable to:

  • Plesk for Linux

Symptoms

  • After upgrading MariaDB, the MariaDB service fails to start with the following error message in /var/log/mariadb/mariadb.log or /var/log/mysql/error.log:

    [Note] InnoDB: Starting shutdown...
    [ERROR] Plugin 'InnoDB' init function returned error.
    [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
    [Note] Plugin 'FEEDBACK' is disabled.
    [ERROR] Unknown/unsupported storage engine: InnoDB
    [ERROR] Aborting

    or MariaDB service returns the following error:

    # service mariadb status
    ERROR! MariaDB is running but PID file could not be found

  • The same error may appear during Plesk upgrade or update.

Cause

MariaDB database server was not properly upgraded.

Resolution

  1. Connect to the Plesk server via SSH
  2. Shut down MariaDB service:

    # mysqladmin -uadmin -p`cat /etc/psa/.psa.shadow` -h127.0.0.1 --protocol=tcp shutdown

  3. Remove the incorrect service script and reload systemctl configuration:

    # rm -f /etc/init.d/mysql && systemctl daemon-reload

  4. Start the MariaDB service:

    # systemctl restart mariadb

  5. Enable MariaDB service start on boot:

    # systemctl enable mariadb

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