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advanced-synthesis.md

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Advanced Synthesis

Deletion Modes

Eno will delete all resources associated with a composition when it's deleted. In unusual cases where the resources should be preserved, a special annotation can be set on the composition before it's deleted:

annotations:
  eno.azure.io/deletion-strategy: orphan

Ignore side effects

Consider a "side effect" any event that's not a change to the composition spec. A new synthesizer version or a change to an input are examples of this. Setting this annotation on a composition (or through a Symphony's variation) will prevent it from being resynthesized on side effects.

annotations:
  eno.azure.io/ignore-side-effects: "true"

Patch Unmanaged Resources

Synthesizers can generate special "pseudo resources" to modify objects not managed by Eno.

Standard jsonpatch operations are supported.

apiVersion: eno.azure.io/v1
kind: Patch
metadata:
  name: resource-to-be-patched
  namespace: default
patch:
  apiVersion: v1
  kind: ConfigMap
  ops:
    - { "op": "add", "path": "/data/hello", "value": "world" }

Note: the resource will not be created if it doesn't already exist. Similarly, removing the patch pseudo-resource will not cause Eno to delete the resource.

Setting metadata.deletionTimestamp to any value will cause the resource to be deleted if it exists.

apiVersion: eno.azure.io/v1
kind: Patch
metadata:
  name: resource-to-be-deleted
  namespace: default
patch:
  apiVersion: v1
  kind: ConfigMap
  ops:
    - { "op": "add", "path": "/metadata/deletionTimestamp", "value": "anything" }