← Linux Administration learning pathLinux Administration · Module 5 of 10
Processes and services
Manage running programs and system services.
📖 Key ideas
- ps aux and top/htop show processes.
- kill PID sends signals; kill -9 forces.
- systemd manages services: systemctl start/stop/restart/status nginx.
- systemctl enable starts a service at boot.
- journalctl -u nginx shows service logs.
💡 Real-life example: systemd is a building manager who starts every shop (service) in the morning and restarts any that close unexpectedly.
ProcessRunning program
systemdInit and service manager
systemctlControls systemd services
journalctlReads systemd logs