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Add new section: Recovery after Failed Upgrades (#1671)

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Co-authored-by: Mila <lyudmila.ndl@gmail.com>
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docs/operation/index.rst
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@ -8,5 +8,6 @@ Operation Mode
information
boot-options
upgrade-recovery
password-recovery
raid

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docs/operation/upgrade-recovery.rst Normal file
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.. _upgrade_recovery:
##############################
Recovery after Failed Upgrades
##############################
This section explains **VyOS’s upgrade recovery**, which restores the system to the last working version after a failed upgrade. It covers the following points:
* :ref:`Configuration: <configuration>` How to enable upgrade recovery
* :ref:`How it Works: <how_it_works>` Overview of the recovery process
* :ref:`Cancelling Recovery: <cancelling_recovery>` Overview of the recovery process
.. _configuration:
*************
Configuration
*************
.. warning:: Upgrade recovery is disabled by default. To use it, **enable it first**.
To enable upgrade recovery, run the following command:
.. cfgcmd::
set system option reboot-on-upgrade-failure [timeout <min>]
* ``timeout <min>:`` The time in minutes (from 5 to 30) you have to cancel upgrade recovery. See :ref:`Cancelling Recovery <cancelling_recovery>`.
.. _how_it_works:
************
How it Works
************
After a VyOS upgrade, the system monitors the boot process. Upon detecting a boot failure, VyOS initiates a revert to the last working version and displays the following warning:
.. code-block:: none
Booting failed, reverting to previous image
Automatic reboot in xx minutes
Use "reboot cancel" to cancel
If no action is taken, the reboot happens automatically after the configured timeout. Upon successful recovery and reboot, the following message appears:
.. code-block:: none
WARNING: Image update to "VyOS 1.5.xxxx" failed
Please check the logs:
/usr/lib/live/mount/persistence/boot/NAME/rw/var/log
Message is cleared on next reboot!
.. _cancelling_recovery:
*******************
Cancelling Recovery
*******************
Upon detecting a boot failure, you have the predefined timeout to cancel upgrade recovery. This is useful if you want to troubleshoot the faulty VyOS version on your own.
To cancel upgrade recovery, run the following command:
.. code-block:: none
reboot cancel