Pending jobs queue systemd
Show in-flight start/stop jobs to diagnose a hung boot or a unit stuck activating
systemctl list-jobs
more systemd
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Enable and start service
systemctl enable --now myapp.service
Show failed units
systemctl list-units --state=failed
Reload unit file after edit
systemctl daemon-reload && systemctl restart myapp.service
Override unit with drop-in
systemctl edit myapp.service
Show unit file content
systemctl cat myapp.service