SCS Standard Images
Introduction
The Sovereign Cloud Stack (SCS) provides standards for a range of cloud infrastructure types. It strives for interoperable and sovereign cloud offerings which can be deployed and used by a wide range of organizations and individuals.
To this end, SCS unifies the naming and sourcing of virtual machine images, and for certain images their presence is mandated or recommended.
Uploading custom images
Image upload via Glance MUST be allowed based on a fair-use policy.
Mandatory image sources
Generic OS images
For an OS image with os_purpose=generic, the image_source SHOULD come from the original vendor. This allows the user to download and inspect the image.
Specifically, the following forms are even REQUIRED:
os_distro | os_version | permissible image_source form(s) |
|---|---|---|
| debian | [N]N | https://cloud.debian.org/images/cloud/{codename}/... |
https://cdimage.debian.org/cdimage/cloud/{codename}/... | ||
| ubuntu | NN.NN | https://cloud-images.ubuntu.com/releases/{codename}/... |
https://cloud-images.ubuntu.com/{codename}/... |
Official SCS CAPI images
For each image whose name matches the regular expression
ubuntu-capi-image( |-)v[0-9].[0-9]+(.[0-9]+)?
the following property values MUST be set:
| property | value (pattern) |
|---|---|
image_source | https://nbg1.your-objectstorage.com/osism/openstack-k8s-capi-images/... |
(tolerable for compatibility): https://swift.services.a.regiocloud.tech/swift/v1/AUTH_b182637428444b9aa302bb8d5a5a418c/openstack-k8s-capi-images/... | |
os_purpose | k8snode |
image_description | https://github.com/osism/k8s-capi-images |
CSPs are free to register CAPI images with a different naming scheme from different source.
Mandatory and recommended images
The tables in this section show what images are required or recomended.
Note that this standard does not prohibit any images, and neither does it preclude the operator from providing any and all optional images, so long as they do not violate above regulations on image sources.
Generic OS images
Each row of the following table describes an image that MUST or SHOULD exist, depending on the value in the column 'status'.
| status | os_distro | os_version | os_purpose |
|---|---|---|---|
| required | ubuntu | latest LTS, no later than April 30 | generic |
| recommended | ubuntu | previous LTS | generic |
| recommended | debian | latest stable, no later than one month after release | generic |
| recommended | debian | previous stable | generic |
A generic OS image MAY be named in the form "distro version", without codename or build date; for instance,
Ubuntu 24.04,Debian 13.
Note: when a new LTS/stable version is released and the respective image added to the environment, the images of any previous versions may or may not be kept.
Official SCS CAPI images
An image whose name matches the regular expression
ubuntu-capi-image-v[0-9].[0-9]+(.[0-9]+)?
SHOULD be present.