podSpecPatch for init container

[BhavikaSharma]

Hi, I am trying to understand how to use podSpecPatch for init containers to manipulate resource requirements.

When submitting:

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: pod-spec-patch-
spec:
  entrypoint: whalesay
  arguments:
    parameters:
      - name: cpu-limit
        value: 100m
  templates:
  - name: whalesay
    podSpecPatch: '{"containers":[{"name":"init", "resources":{"limits":{"cpu": "{{workflow.parameters.cpu-limit}}" }}}]}'
    container:
      image: docker/whalesay:latest
      command: [cowsay]
      args: ["hello world"]
      resources:
        limits:
          cpu: 200m
          memory: 200Mi

I'm seeing the error:

container "init" in template "whalesay", does not have the command specified: when using the emissary executor you must either explicitly specify the command, or list the image's command in the index: https://argoproj.github.io/argo-workflows/workflow-executors/#emissary-emissary

I would assume that a command wouldn't be explicitly required for init but did also try with this:

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: pod-spec-patch-
spec:
  entrypoint: whalesay
  arguments:
    parameters:
      - name: cpu-limit
        value: 100m
  templates:
  - name: whalesay
    podSpecPatch: '{"containers":[{"name":"init",  "image":<ARGOEXEC_IMAGE>, "command": ["init"], "resources":{"limits":{"cpu": "{{workflow.parameters.cpu-limit}}" }}}]}'
    container:
      image: docker/whalesay:latest
      command: [cowsay]
      args: ["hello world"]
      resources:
        limits:
          cpu: 200m
          memory: 200Mi

and got the error:

Pod "pod-spec-patch-v4cn6" is invalid: spec.initContainers[0].name: Duplicate value: "init"

I was wondering how to use podSpecPatch for init containers. The first Workflow succeeds if init is changed to main or wait. My ultimate goal is to increase resource limits due to this issue: #1322 where the latest suggestion was to use podSpecPatch but please let me know if there's another path that could be explored. Thanks.

[BhavikaSharma]

Init container live under initContainers not containers.

Working spec:

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: pod-spec-patch-
spec:
  entrypoint: whalesay
  arguments:
    parameters:
      - name: cpu-limit
        value: 100m
  templates:
  - name: whalesay
    podSpecPatch: '{"initContainers":[{"name":"init", "resources":{"limits":{"cpu": "{{workflow.parameters.cpu-limit}}" }}}]}'
    container:
      image: docker/whalesay:latest
      command: [cowsay]
      args: ["hello world"]
      resources:
        limits:
          cpu: 200m
          memory: 200Mi