Linux/Systemd

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systemctl

systemctl list-units
systemctl list-units -t service

systemctl status NAME

systemctl start NAME
systemctl stop NAME
systemctl restart NAME
systemctl reload NAME

systemctl list-unit-files
systemctl enable NAME
systemctl disable NAME
systemctl is-enabled NAME

systemctl --failed

journalctl
journalctl -u NAME

hostnamectl
alias systemctl='systemctl --no-pager'

/lib/systemd/system

[Service]
Type=forking
PrivateTmp=yes
User=nobody
Group=nobody
# Run ExecStartPre with root-permissions
PermissionsStartOnly=true
ExecStartPre=-/usr/bin/mkdir /var/run/dhis
ExecStartPre=/usr/bin/chown -R nobody:nobody /var/run/dhis/
# Run ExecStart with User=nobody / Group=nobody
ExecStart=/usr/sbin/dhid -P /var/run/dhis/dhid.pid
PIDFile=/var/run/dhis/dhid.pid