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How To Automatically Reboot Ubuntu After Power Failure

Ubuntu 14

In the world of servers and systems administration, ensuring the continuity of services is paramount. One of the common scenarios that can disrupt service is a power failure. In this article, we’ll explore how to configure an Ubuntu system to automatically reboot after a power failure, ensuring that your services are back online as quickly as possible.

Quick Answer

To automatically reboot Ubuntu after a power failure, you can either modify the BIOS settings to select the "Reboot" option under "After power loss" or modify the GRUB bootloader settings in Ubuntu by editing the /etc/default/grub file and setting the GRUB_RECORDFAIL_TIMEOUT value to the desired number of seconds.

Understanding the Need for Automatic Reboot

Power failures are a common occurrence and can happen due to various reasons. When the power is restored, you’d want your system to reboot automatically, especially if the system is a server providing critical services. This helps in reducing downtime and ensures that your services are up and running without manual intervention.

BIOS Settings

The first place to look for configuring automatic reboot is the BIOS settings. The BIOS (Basic Input Output System) is the low-level software that initializes the hardware when you power on your system. It also controls how the system behaves immediately after power is restored.

In the BIOS settings, you can typically find an option like “After power loss” or “AC Power Recovery” with options such as “Power off” and “Reboot”. By selecting “Reboot”, you can ensure that the machine automatically boots up when power is available again.

The exact steps to access and modify the BIOS settings vary depending on the manufacturer and model of your system. You typically need to press a specific key (like F2, F10, or Del) during boot to enter the BIOS setup.

Modifying Ubuntu Boot Behavior

If you can’t change the BIOS settings or if you prefer to control the boot behavior from within the operating system, you can do so by modifying the GRUB bootloader settings in Ubuntu.

Open a terminal and run the following command to edit the GRUB configuration file:

sudo nano /etc/default/grub

This command opens the GRUB configuration file in the nano text editor. The sudo command is used to run the command with root privileges, which are necessary to modify system files.

In the file, find the line that starts with GRUB_RECORDFAIL_TIMEOUT. If the line doesn’t exist, you can add it at the end of the file. Set the value to the number of seconds you want the boot options to be displayed before the system automatically boots the default option. For example, to make the system wait for 5 seconds, you can add the following line:

GRUB_RECORDFAIL_TIMEOUT=5

After making the changes, save the file and exit the editor. In nano, you can do this by pressing Ctrl+X, then Y, then Enter.

Finally, apply the changes by updating GRUB with the following command:

sudo update-grub

This command generates the actual configuration file used by GRUB during boot, incorporating the changes you made to the /etc/default/grub file.

Conclusion

By configuring your system to automatically reboot after a power failure, you can reduce downtime and ensure that your services are quickly back online. Whether you choose to modify the BIOS settings or the Ubuntu boot behavior, the process is straightforward and can be done in a few minutes.

Remember to test your settings to make sure that your system behaves as expected after a power failure. You can do this by simulating a power failure and observing the system’s behavior when power is restored.

Why is it important to automatically reboot Ubuntu after a power failure?

It is important to automatically reboot Ubuntu after a power failure because it helps to reduce downtime and ensures that critical services are back online without manual intervention.

Can I configure automatic reboot in the BIOS settings?

Yes, you can configure automatic reboot in the BIOS settings by selecting the "Reboot" option under the "After power loss" or "AC Power Recovery" settings.

What if I can’t change the BIOS settings?

If you can’t change the BIOS settings or prefer to control the boot behavior from within the operating system, you can modify the GRUB bootloader settings in Ubuntu.

How do I modify the GRUB bootloader settings?

To modify the GRUB bootloader settings, open a terminal and run the command sudo nano /etc/default/grub to edit the GRUB configuration file. Then, find or add the line GRUB_RECORDFAIL_TIMEOUT and set the value to the number of seconds you want the boot options to be displayed before the system automatically boots the default option. Save the file, exit the editor, and update GRUB with sudo update-grub.

How can I test if the automatic reboot settings are working?

To test if the automatic reboot settings are working, you can simulate a power failure by disconnecting the power source and observing the system’s behavior when power is restored. Make sure to monitor if the system automatically reboots as expected.

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