How to put a server to sleep on Linux?

There are two common methods to allow a server to shut down in a Linux system: setting up system services or using cron jobs.

1. Configure system services.
2. Create a new systemd service file, such as shutdown.service, with the following content:
   [Unit]
   Description=Shutdown the server

   [Service]
   Type=oneshot
   ExecStart=/sbin/shutdown -h now

   [Install]
   WantedBy=multi-user.target

3. Save the file in the directory /etc/systemd/system.
4. Enable the service and set it to start automatically on system boot:
   sudo systemctl enable shutdown.service
   sudo systemctl start shutdown.service
5. Later, you can manually execute “sudo systemctl stop shutdown.service” to cancel the suspension operation.
6. Utilize scheduled tasks:
7. Edit the current user’s scheduled tasks using the crontab -e command.
8. Add a command to schedule a shutdown operation at a specific time, such as: 0 0 * * 0 /sbin/shutdown -h now.
9. Save and exit the editor.

After setting up through the above methods, the server will automatically shut down at the specified time, achieving the effect of hanging up.