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 booted on the current system.
[email protected]:~$ 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.
[email protected]:~$ 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.
[email protected]:~$ show version Version: VyOS 1.3-rolling-201912181733 Built by: [email protected] 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
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:
Select the default boot image which will be started on the next boot of the system.
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.