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SKE Component Promise

Deprecated

The SKE Backstage Component Promise is now deprecated and its documentation will be removed soon.

The functionality it provides is now available by default with v0.14.0 version of the Backstage Plugins and SKE version 0.21.0.

The SKE Backstage Component Promise provides additional functionality to the SKE Backstage integration by offloading management of Backstage Components and Templates files from your Promises. The Promise enables the following features:

  • Allow updates to the Backstage Component and Templates while a Pipeline is still running.
  • Enables the combination of multiple Backstage Components and Templates into a single catalog-info.yaml file. For some Backstage integrations, such as GitLab, this is a requirement.

You can install the Promise via kubectl:

kubectl apply -f https://syntasso-enterprise-releases.s3.eu-west-2.amazonaws.com/promises/ske-backstage-component-promise.yaml

Component updates with multiple Pipelines​

If your Promise or Resource workflow contains multiple Pipelines, you may wish to update the associated Component in Backstage at the end of each Pipeline. For example, the Resource status could be updated in every Pipeline to convey the latest information about the Resource to the requester in Backstage.

To do this, run the SKE Backstage Generator as normal, then create a request to the SKE Backstage Component Promise within the next pipeline container. In this example the image ghcr.io/syntasso/kratix-marketplace/create-backstage-component-request:v0.1.0 is responsible for generating a SKE Backstage Component Promise request:

  # ...
  workflows:
    resource:
      configure:
      - apiVersion: platform.kratix.io/v1alpha1
        kind: Pipeline
        metadata:
          name: resource-configure
        spec:
          # rbac required by new create-backstage-component-request image
          rbac:
            permissions:
              - apiGroups: ["syntasso.io"]
                verbs: ["*"]
                resources: ["backstagecomponents"]
          containers:
          - image: ghcr.io/syntasso/kratix-marketplace/jenkins-configure-pipeline:v0.1.0
            name: jenkins-resource-pipeline
          - image: registry.syntasso.io/syntasso/ske-backstage-generator:VERSION
            name: ske-backstage-generator
          - image:  ghcr.io/syntasso/kratix-marketplace/create-backstage-component-request:v0.1.0
            name: create-backstage-component-request
    promise:
      configure:
      - apiVersion: platform.kratix.io/v1alpha1
        kind: Pipeline
        metadata:
          name: promise-configure
        spec:
          rbac:
            permissions:
              - apiGroups: ["syntasso.io"]
                verbs: ["*"]
                resources: ["backstagecomponents"]
          containers:
          - image: ghcr.io/syntasso/kratix-marketplace/jenkins-configure-pipeline:v0.1.0
            name: jenkins-promise-pipeline
          - image: registry.syntasso.io/syntasso/ske-backstage-generator:VERSION
            name: ske-backstage-generator
          - image:  ghcr.io/syntasso/kratix-marketplace/create-backstage-component-request:v0.1.0
            name: create-backstage-component-request
note

The versions of the ske-backstage-generator image used in your Promise specification and the ske-backstage-generator image in the SKE Backstage Component Promise must match

Requesting Backstage Components​

When creating the BackstageComponent requests you need to ensure that you set the correct .metadata.ownerReferences on the resource to ensure it is deleted when the resource/promise is deleted. An example of this is shown below:

apiVersion: syntasso.io/v1alpha1
kind: BackstageComponent
metadata:
  name: <unique-name>
  namespace: <same namespace as the request (kratix-platform-system for promises)>
  ownerReferences:
  - apiVersion: <apiVersion of the parent object>
    blockOwnerDeletion: false
    controller: false
    kind: <kind of the parent object>
    name: <name of the parent object>
    uid: <uid of the parent object>
spec:
- resources: |
  ... # contents of /kratix/output/backstage/catalog-info.yaml

The name apiVersion, kind and uid fields under ownerReferences must equal the parent object for this request, which is the /kratix/input/object.yaml.

The spec.resources needs to be a string containing the Backstage Component/Template YAML files.

Running in this mode, the SKE Backstage Generator will not schedule the Backstage documents itself. Instead, it will delegate this responsibility to the SKE Backstage Component Promise.

This allows the Backstage Component document to be managed per-Resource, meaning Resource metadata such as the status can be updated across multiple Pipelines.

After creating the BackstageComponent request, you need to ensure your pipeline does not also schedule the same document to the Backstage Destination. To prevent this you can rm -rf /kratix/output/backstage and remove the dir: backstage entry in your /kratix/metadata/destination-selectors.yaml after making the request.

Example bash pipeline script
              - image: ghcr.io/syntasso/kratix-pipeline-utility:v0.0.1
                name: make-backstage-request
                command: [ "sh" ]
                args:
                  - -c
                  - |
                    export name="$(yq eval '.metadata.name' /kratix/input/object.yaml)"
                    export namespace="$(yq eval '.metadata.namespace' /kratix/input/object.yaml)"
                    export promise_name=$KRATIX_PROMISE_NAME

                    kind=$(yq eval '.kind' /kratix/input/object.yaml)
                    api_version=$(yq eval '.apiVersion' /kratix/input/object.yaml)
                    uid=$(yq eval '.metadata.uid' /kratix/input/object.yaml)
                    concatenated_string="${promise_name}-${namespace}-${name}"
                    hash=$(echo -n "$concatenated_string" | sha256sum | cut -c1-5)
                    truncated_string=$(echo -n "$concatenated_string" | cut -c1-50)
                    deterministic_name="${truncated_string}-${hash}"

                    cd /kratix/output/

                    cat <<EOF > rr.yaml
                    apiVersion: syntasso.io/v1alpha1
                    kind: BackstageComponent
                    metadata:
                      name: $deterministic_name
                      namespace: $namespace
                      ownerReferences:
                      - apiVersion: $api_version
                        blockOwnerDeletion: false
                        controller: false
                        kind: $kind
                        name: $name
                        uid: $uid
                    spec: {}
                    EOF

                    # set .spec.resources equal to file contents of catalog-info.yaml
                    yq eval '.spec.resources = strload("backstage/catalog-info.yaml")' -i rr.yaml
                    kubectl apply -f rr.yaml
                    rm -rf /kratix/output/rr.yaml /kratix/output/backstage/ /kratix/metadata/destination-selectors.yaml

Scheduling Backstage Components​

By default, BackstageComponent requests are scheduled to your Backstage destination. If you need to schedule a BackstageComponent to a destination other than the default Backstage destination with label environment: backstage, you can set the .spec.destinationSelectors on the resource to customize its scheduling behavior. An example of this is shown below:

apiVersion: syntasso.io/v1alpha1
kind: BackstageComponent
metadata:
  name: A-NAME
  namespace: NAMESPACE
spec:
  destinationSelectors:
  - matchLabels:
      environment: backstage-instance-one
      team: billing
- resources: |
  ... # contents of /kratix/output/backstage/catalog-info.yaml

Generate a single Backstage catalog​

Using the SKE Backstage Component Promise, you can optionally choose to write a single catalog-info.yaml file for Backstage to read from, instead of the default behaviour of one catalog file per Promise or resource request.

To do this, there are two steps required:

  • Configuring the SKE Backstage Generator to write all of the Backstage manifests in a single catalog-info.yaml.
  • Configuring all of your Promises to use the SKE Backstage Component Promise.

First, apply the following config map to your Platform cluster:

apiVersion: v1
data:
  allInOne: "true"
kind: ConfigMap
metadata:
  name: ske-backstage-component-promise-config
  namespace: kratix-platform-system

Then configure all of your Promises which use the SKE Backstage Generator to make a request to the SKE Backstage Component Promise within your Pipeline, as illustrated in the section above.

info

To ensure that a single catalog-info.yaml file is created, you must ensure that all of your Promises which use the SKE Backstage Generator are set up to make a request to the SKE Backstage Component Promise in both the Promise and Resource workflows.

Configuring the allInOne field to true will cause the SKE Backstage Component Promise to aggregate the Backstage Component and Template files for all Promises and Resources into a single catalog-info.yaml file in the Backstage Destination.

With these changes, your SKE Backstage integration will result in a single catalog-info.yaml file being written to your Backstage Destination containing all of the generated Component and Template manifests.