This service customizes and serves RHCOS images for the Assisted Installer Service. It downloads a set of RHCOS images on startup based on config and responds to a single API endpoint to allow a user to download a customized image for use with assisted service.

Build the image and run it locally using podman

make build run

This will start the service running on port 8080 by default. It will also bind-mount the data and certs local directories into the container root.

skipper make test

• DATA_DIR - Path at which to store downloaded RHCOS images.
• RHCOS_VERSIONS/OS_IMAGES - JSON string indicating the supported versions and their required urls. OS_IMAGES takes precedence.
• LISTEN_PORT - Image Service listen port
• HTTPS_KEY_FILE - tls key file path
• HTTPS_CERT_FILE - tls cert file path
• ASSISTED_SERVICE_SCHEME - protocol to use to query assisted service for image information
• ASSISTED_SERVICE_HOST - host or host:port to use to query assisted service for image information
• IMAGE_SERVICE_BASE_URL - the base URL to use to query the image service
• MAX_CONCURRENT_REQUESTS - caps the number of inflight image downloads to avoid things like open file limits
• ALLOWED_DOMAINS - When set, determines how the service responds to requests with Origin headers
• HTTP_LISTEN_PORT - When set, plain http listener is started on that port

Example OS_IMAGES:

[
	{
		"openshift_version": "4.6",
		"cpu_architecture":  "x86_64",
		"url":               "https://mirror.openshift.com/pub/openshift-v4/x86_64/dependencies/rhcos/4.6/4.6.8/rhcos-4.6.8-x86_64-live.x86_64.iso",
		"version":           "46.82.202012051820-0"
	},
	{
		"openshift_version": "4.7",
		"cpu_architecture":  "x86_64",
		"url":               "https://mirror.openshift.com/pub/openshift-v4/x86_64/dependencies/rhcos/4.7/4.7.33/rhcos-4.7.33-x86_64-live.x86_64.iso",
		"version":           "47.84.202109241831-0"
	},
	{
		"openshift_version": "4.8",
		"cpu_architecture":  "x86_64",
		"url":               "https://mirror.openshift.com/pub/openshift-v4/x86_64/dependencies/rhcos/4.8/4.8.14/rhcos-4.8.14-x86_64-live.x86_64.iso",
		"version":           "48.84.202109241901-0"
	}
]

Downloads the RHCOS image for the specified image ID.

• version: indicates the version of the RHCOS base image to use (must match an entry in RHCOS_VERSIONS)
• arch: the base image cpu architecture (must match an entry in RHCOS_VERSIONS)
• type: full-iso to download the ISO including the rootfs, minimal-iso to download the ISO without the rootfs
• api_key: the api token to pass through to the assisted service calls if local authentication is required
• image_token: the token to pass through to the Image-Token assisted service header if image pre-signed authentication is required

• Authorization: this header is passed directly through to assisted service requests to handle RHSSO authentication

Downloads the RHCOS initrd with the ignition for the specified image appended.

• version: indicates the version of the RHCOS base image to use (must match an entry in RHCOS_VERSIONS)
• arch: the base image cpu architecture (must match an entry in RHCOS_VERSIONS)
• api_key: the api token to pass through to the assisted service calls if local authentication is required
• image_token: the token to pass through to the Image-Token assisted service header if image pre-signed authentication is required

• Authorization: this header is passed directly through to assisted service requests to handle RHSSO authentication

Downloads the artifact specified from the ISO.

• version: indicates the version of the RHCOS base image to use (must match an entry in RHCOS_VERSIONS)
• arch: the base image cpu architecture (must match an entry in RHCOS_VERSIONS)

Returns 503 until the images are downloaded Returns 200 if the service is ready to respond to requests

Returns 200 if the service is running

Prometheus metrics scraping endpoint

Authentication tokens are accepted in various ways to support different deployment models and assisted service authentication backends The following table shows how each authentication input is translated when making calls to assisted service