bashANYsystemctlservicestatus
bash
systemctl status nginxShow status, recent logs, and the service main PID.
Linux systemd and Service Processes
systemd-oriented process inspection, signaling, cgroup views, transient units, and service troubleshooting.
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systemd Service Process Views
Inspect service state and main PIDs under systemd.
bashANYsystemctlmainpid
bash
systemctl show -p MainPID nginxExtract the tracked main PID for a unit.
bashANYsystemctlunit-file
bash
systemctl cat nginxPrint the unit file and drop-ins defining a service.
bashANYsystemctlservices
bash
systemctl list-units --type=service --state=runningList active services managed by systemd.
bashANYjournalctlservicelogs
bash
journalctl -u nginx -n 100 --no-pagerRead recent logs associated with one systemd unit.
bashANYjournalctlpidlogs
bash
journalctl _PID=1234 -n 100 --no-pagerFilter the journal by process ID.
systemd Service Control
Start, stop, restart, and signal services through systemd.
bashANYsystemctlstart
bash
sudo systemctl start nginxStart a service unit.
bashANYsystemctlstop
bash
sudo systemctl stop nginxStop a service unit gracefully.
bashANYsystemctlrestart
bash
sudo systemctl restart nginxRestart a service unit.
bashANYsystemctlreload
bash
sudo systemctl reload nginxAsk a service to reload its configuration.
bashANYsystemctlkillsignal
bash
sudo systemctl kill -s SIGKILL nginxSignal all or selected processes in a service cgroup.
bashANYsystemctlkillmainpid
bash
sudo systemctl kill --kill-whom=main -s SIGUSR1 nginxSignal only the service main process.
bashANYsystemctlreload-or-restart
bash
sudo systemctl reload-or-restart nginxUse reload when available, else restart.
Control Groups and Unit Trees
Inspect cgroup-based process organization under systemd.
bashANYsystemd-cglscgroups
bash
systemd-cglsDisplay control groups and the processes inside them.
bashANYsystemd-cgtopcgroups
bash
systemd-cgtopShow top cgroups by CPU, memory, and I/O load.
bashANYloginctlsessions
bash
loginctl list-sessionsInspect active user sessions and seats under systemd-logind.
bashANYloginctlsessions
bash
loginctl show-session 2Inspect one logind session in detail.
bashANYsystemctlcgroups
bash
systemctl show -p ControlGroup nginxReveal the cgroup path tied to a unit.
Transient Units and Resource Controls
Launch processes directly under systemd and constrain them.
bashANYsystemd-runscope
bash
systemd-run --scope htopRun an interactive process in its own transient scope unit.
bashANYsystemd-runservice
bash
systemd-run --unit=myjob --remain-after-exit /usr/bin/sleep 60Launch a one-off command as a transient service unit.
bashANYsystemctlresource-control
bash
sudo systemctl set-property myjob.service CPUQuota=50%Apply runtime resource-control properties to a unit.
bashANYsystemctlmemory-limit
bash
sudo systemctl set-property myjob.service MemoryMax=1GLimit service memory through cgroup controls.
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