Part 3: Make it a real server

13. Keep a laptop running with the lid closed#

Laptops only. Skip this chapter for desktop PCs. What you'll do: stop the laptop from going to sleep when you close the lid. Time: 10 minutes.

Step 1: Create a settings file#

Type on: the server

sudo mkdir -p /etc/systemd/logind.conf.d
sudo nano /etc/systemd/logind.conf.d/lid.conf

Paste:

File: /etc/systemd/logind.conf.d/lid.conf

[Login]
HandleLidSwitch=ignore
HandleLidSwitchExternalPower=ignore
HandleLidSwitchDocked=ignore

Save and exit.

Step 2: Restart and test#

Type on: the server

sudo reboot

Wait 2 minutes. Then:

With the lid open, check ssh homeserver works.
Close the lid and wait 1 minute.
Open a new connection: ssh homeserver. It should work.

Safety for a laptop that's always on#

Heat

Put it on a hard, flat surface, never on fabric. Leave the vents clear.
Check the temperature now and then:

Type on: the server

sudo apt install lm-sensors
sensors

At rest, 35–55 °C is normal. Above about 85 °C under load is too hot.

Battery

Look at the laptop every month. If the case bulges, or the trackpad or keyboard lifts, the battery is swelling. Unplug it and have the battery replaced. A worn battery also won't keep the server on during a power cut.

Undo

sudo rm /etc/systemd/logind.conf.d/lid.conf and then sudo reboot.

Done when: a new SSH connection works with the lid closed.

Next: 14. Reach it from anywhere (Tailscale)