User Story:

As a user, I want to be able to:

• specify the use of Azure marketplace images in the install config

so that I can

• create compute nodes using marketplace images without:
  • editing manifests
  • knowing the details of the particular images

Acceptance Criteria:

Description of criteria:

• worker machinesets are populated with correct marketplace image
• if a field is added to machine pools, openshift explain and repo docs should be updated
• validation to prevent trying to use images for masters

Out of Scope:

Only support for compute nodes. Terraform changes for control plane is not needed.

Engineering Details:

• https://docs.microsoft.com/en-us/azure/virtual-machines/linux/cli-ps-findimage

• • This shows how to find images using the CLI and that users must accept a plan for their subscription before using our images
• Images are published in the marketplace with four different fields, collectively these fields are colon separated and called a URN. Here is an example of three images:

• az vm image list --all --offer ocp-rhcos-worker
  
  [
    {
      "offer": "ocp-rhcos-worker",
      "publisher": "redhat-rhel",
      "sku": "49-gen2",
      "urn": "redhat-rhel:ocp-rhcos-worker:49-gen2:4.9.456",
      "version": "4.9.456"
    },
    {
      "offer": "ocp-rhcos-worker",
      "publisher": "redhat-rhel",
      "sku": "ocp-4-free",
      "urn": "redhat-rhel:ocp-rhcos-worker:ocp-4-free:4.9.2021111600",
      "version": "4.9.2021111600"
    },
    {
      "offer": "ocp-rhcos-worker",
      "publisher": "redhat-rhel",
      "sku": "ocp-4-free-gen1",
      "urn": "redhat-rhel:ocp-rhcos-worker:ocp-4-free-gen1:4.9.2021111600",
      "version": "4.9.2021111600"
    }
  ] 

• It should be possible to simply have a boolean in the machine pool. For example we could have a field such as compute[0].platform.azure.useMarketplaceImage. If that is set, pipe the data from above into the worker machine provider spec image field