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:
/ /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.
List all available system images which can be bootet on the current system.
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
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
show system image.
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
Show current system image version.
vyos@vyos:~$ show version Version: VyOS 1.3-rolling-201912181733 Built by: email@example.com 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
New system images can be added using the
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.
Only LTS releases are PGP-signed.
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
delete system image
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.
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
copy command. So, for instance, in order
/config/config.boot from VyOS 1.2.1 image, you would use the
copy file 1.2.1://config/config.boot to /tmp/config.boot.1.2.1
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
After reboot you might want to verify the version you are running with
show version command.
If you need to rollback to a previous image, you can easily do so. First
check the available images through the
show system image
command and then select your image with the following command:
Then reboot the system.
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.