Upgrade to Plesk Onyx fails with the following output:
Trying to start service mariadb...
Some problems are found during attempt to start service mariadb - control script doesn't exist or isn't executable(see log file: /var/log/plesk/install/plesk_17.0.17_installation.log)
Starting sw-engine (via systemctl): Failed to start sw-engine.service: Connection timed out
Trying to start service drwebd... Failed to list unit files: Connection timed out
Failed to list unit files: Connection timed out
Services fail to start because of high CPU usage by systemd.
/run/systemd/system/folder in order to decrease the CPU usage:
# mkdir /root/plesk_support/ # mv /run/systemd/system/session-*.scope* /root/plesk_support/
Start the services.
Restart the upgrade again.