Systemd

list of all services, included not active

systemctl list-units -t service --all 

systemctl --failed
systemctl reset-failed

systemctl list-unit-files -t service

Plot graph

systemd-analyze plot > systemd.svg

Start service after network enabled

https://systemd.io/NETWORK_ONLINE/

Links

https://fedoraproject.org/wiki/How_to_debug_Systemd_problems

Override

systemctl edit [service-name]

/etc/systemd/system/[service-name].d/override.conf