:lastproofread: 2021-07-26

.. _image-mgmt:

################
Image Management
################

The VyOS image-based installation is implemented by creating a directory for
each image on the storage device selected during the install process.

The directory structure of the boot device:

.. code-block:: none

  /
  /boot
  /boot/grub
  /boot/1.2.0-rolling+201810021347

The image directory contains the system kernel, a compressed image of the root
filesystem for the OS, and a directory for persistent storage, such as
configuration. On boot, the system will extract the OS image into memory and
mount the appropriate live-rw sub-directories to provide persistent storage
system configuration.

This process allows for a system to always boot to a known working state, as
the OS image is fixed and non-persistent. It also allows for multiple releases
of VyOS to be installed on the same storage device. The image can be selected
manually at boot if needed, but the system will otherwise boot the image
configured to be the default.

.. opcmd:: show system image

   List all available system images which can be booted on the current system.

   .. code-block:: none

     vyos@vyos:~$ show system image
     The system currently has the following image(s) installed:

        1: 1.2.0-rolling+201810021347 (default boot)
        2: 1.2.0-rolling+201810021217
        3: 1.2.0-rolling+201809252218


.. opcmd:: delete system image [image-name]

   Delete no longer needed images from the system. You can specify an optional
   image name to delete, the image name can be retrieved via a list of available
   images using the command :opcmd:`show system image`.

   .. code-block:: none

      vyos@vyos:~$ delete system image
      The following image(s) can be deleted:

         1: 1.3-rolling-201912181733 (default boot) (running image)
         2: 1.3-rolling-201912180242
         3: 1.2.2
         4: 1.2.1

      Select the image to delete: 2

      Are you sure you want to delete the
      "1.3-rolling-201912180242" image? (Yes/No) [No]: y
      Deleting the "1.3-rolling-201912180242" image...
      Done

.. opcmd:: show version

   Show current system image version.

   .. code-block:: none

      vyos@vyos:~$ show version
      Version:          VyOS 1.3-rolling-201912181733
      Built by:         autobuild@vyos.net
      Built on:         Wed 18 Dec 2019 17:33 UTC
      Build UUID:       bccde2c3-261c-49cc-b421-9b257204e06c
      Build Commit ID:  f7ce0d8a692f2d

      Architecture:     x86_64
      Boot via:         installed image
      System type:      bare metal

      Hardware vendor:  VMware, Inc.
      Hardware model:   VMware Virtual Platform
      Hardware S/N:     VMware-42 1d 83 b9 fe c1 bd b2-7d 3d 49 db 94 18 f5 c9
      Hardware UUID:    b9831d42-c1fe-b2bd-7d3d-49db9418f5c9

      Copyright:        VyOS maintainers and contributors





System rollback
===============

If you need to rollback to a previous image, you can easily do so. First
check the available images through the :opcmd:`show system image`
command and then select your image with the following command:

.. opcmd:: set system image default-boot [image-name]

   Select the default boot image which will be started on the next boot
   of the system.

Then reboot the system.

.. note:: VyOS automatically associates the configuration to the image,
   so you don't need to worry about that. Each image has a unique copy
   of its configuration.

If you have access to the console, there is an another way to select
your booting image: reboot and use the GRUB menu at startup.