Lesson 6 of 20 · Learn · 15 min
1.6 Health, backups, monitoring and renewals
Health
- CPU, memory, disk, load, up for: how busy and full the server is. Keep the disk under about 80%.
- Failed: …: a service on the server stopped. Log in and look at it.
- Security updates waiting (run apt upgrade): log in and run
sudo apt update && sudo apt upgrade -y. - A restart is needed to finish updates: restart at a quiet time.
- Agent not reporting yet / No agent installed: use Get install command (or Reinstall the agent), run it on the server as root, and keep it private: it contains the server's key.
Backups
- A whole-server backup every day; the first within a day.
- Take a backup now before any big change.
- Restore this backup: type the server's address to confirm. Everything on the server goes back to that copy.
Monitoring
- Checks run every minute; Recent problems shows when something broke and how long it took to fix.
- Settings: Ports to watch (up to 5; 22 is SSH), a web address that must answer (and words it must show), Slow after, Usage alerts (CPU, memory, disk), and an SMS number.
Controls
| Button | What happens |
|---|---|
| Start / Restart / Stop | Stop takes websites and apps on it offline until you start it |
| New password | A new root password; the old one stops working |
| Reinstall | Erases everything and installs a fresh system. You type the IP address to confirm |
Renewals
- Paid monthly from the Lynk wallet. Keep auto-renew on.
- Missed renewal: runs 3 more days, then stops. Renew within 14 days to start it again. After that, it's deleted with all its data.
Next lesson
1.5 Hands-on: updates, your own user and a keySign in to save your progress and earn the certificate.