.. _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 bootet 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 can be shown using the :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


.. _update_vyos:

Update VyOS
===========

New system images can be added using the :opcmd:`add system image`
command. The command will extract the chosen image and will prompt you
to use the current system configuration and SSH security keys, allowing
for the new image to boot using the current configuration.

.. note:: Only LTS releases are PGP-signed.

.. opcmd:: add system image <url | path> [vrf name] [username user [password pass]]

   Use this command to install a new system image. You can reach the
   image from the web (http://, https://) or from your local system,
   e.g.  /tmp/vyos-1.2.3-amd64.iso.

   The `add system image` command also supports installing new versions
   of VyOS through an optional given VRF. Also if URL in question requires
   authentication, you can specify an optional username and password via
   the commandline which will be passed as "Basic-Auth" to the server.

If there is not enough **free disk space available**, the installation
will be canceled. To delete images use the :opcmd:`delete system image`
command.

VyOS configuration is associated to each image, and **each image has a
unique copy of its configuration**. This is different than a traditional
network router where the configuration is shared across all images.

.. note:: If you have any personal files, like some scripts you created,
   and you don't want them to be lost during the upgrade, make sure
   those files are stored in ``/config`` as this directory is always copied
   to newer installed images.

You can access files from a previous installation and copy them to your
current image if they were located in the ``/config`` directory. This
can be done using the :opcmd:`copy` command. So, for instance, in order
to copy ``/config/config.boot`` from VyOS 1.2.1 image, you would use the
following command:

.. code::

   copy file 1.2.1://config/config.boot to /tmp/config.boot.1.2.1


Example
"""""""

.. code-block:: none

     vyos@vyos:~$ add system image https://downloads.vyos.io/rolling/current/amd64/vyos-rolling-latest.iso
     Trying to fetch ISO file from https://downloads.vyos.io/rolling/current/amd64/vyos-rolling-latest.iso
       % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                      Dload  Upload   Total   Spent    Left  Speed
     100  338M  100  338M    0     0  3837k      0  0:01:30  0:01:30 --:--:-- 3929k
     ISO download succeeded.
     Checking for digital signature file...
       % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                      Dload  Upload   Total   Spent    Left  Speed
       0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
     curl: (22) The requested URL returned error: 404 Not Found

     Unable to fetch digital signature file.
     Do you want to continue without signature check? (yes/no) [yes]
     Checking MD5 checksums of files on the ISO image...OK.
     Done!

     What would you like to name this image? [vyos-1.3-rolling-201912201452]:

     OK.  This image will be named: vyos-1.3-rolling-201912201452


.. hint:: | The most up-do-date Rolling Release for AMD64 can be accessed using the following URL:
   | https://downloads.vyos.io/rolling/current/amd64/vyos-rolling-latest.iso

After reboot you might want to verify the version you are running with
the :opcmd:`show version` command.


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 a another way to select
your booting image: reboot and use the GRUB menu at startup.