1️⃣ Check All Active and Inactive Services
systemctl list-units --type=service --all
🔹 This shows all services, whether active, inactive, or failed.
2️⃣ Check All Active Timers
systemctl list-timers --all
🔹 This displays all systemd timers, including when they last ran and when they will run next.
3️⃣ Show the Status of a Specific Service
systemctl status <service-name>
🔹 Example: Check the status of cron:
systemctl status cron.service
4️⃣ Show the Status of a Specific Timer
systemctl status <timer-name>.timer
🔹 Example: Check a custom-reboot timer:
systemctl status custom-reboot.timer
5️⃣ Check Failed Units Only
systemctl --failed
🔹 This only shows failed services, helping with troubleshooting.
6️⃣ Get a Summary of All Services (Including Failed Ones)
systemctl list-units --type=service --state=failed
🔹 Shows only failed services.
7️⃣ Check If a Specific Service is Enabled at Boot
systemctl is-enabled <service-name>
🔹 Example: Check if ssh starts on boot:
systemctl is-enabled ssh
8️⃣ Get a One-Liner Summary of All Systemd Services
systemctl list-units --type=service --no-pager
🔹 This gives a concise list of all services.
If you prefer a ncurses-based interface:
1️⃣ systemd-cgtop → Shows systemd resource usage (CPU, Memory, etc.)
systemd-cgtop
2️⃣ systemd-analyze blame → Shows slow-starting services
systemd-analyze blame
3️⃣ systemd-analyze critical-chain → Shows slow dependencies in the boot sequence
systemd-analyze critical-chain
Summary Table 📊
| Command | Description |
systemctl list-units --type=service --all | Show all services (active & inactive) |
systemctl list-timers --all | List all timers |
systemctl status <unit> | Show status of a unit |
systemctl --failed | Show only failed services |
systemctl is-enabled <unit> | Check if a service runs at boot |
systemd-analyze blame | Show slow-starting services |
systemd-analyze critical-chain | Show dependency delays in boot |
systemd-cgtop | Show systemd CPU/memory usage |
🚀 Now you're a systemd monitoring ninja! 😎
