Cluster Workflow Templates

v2.8 and after

Introduction

ClusterWorkflowTemplates are cluster scoped WorkflowTemplates. ClusterWorkflowTemplate can be created cluster scoped like ClusterRole and can be accessed across all namespaces in the cluster.

WorkflowTemplates documentation link

Defining ClusterWorkflowTemplate

apiVersion: argoproj.io/v1alpha1
kind: ClusterWorkflowTemplate
metadata:
  name: cluster-workflow-template-whalesay-template
spec:
  templates:
  - name: whalesay-template
    inputs:
      parameters:
      - name: message
    container:
      image: docker/whalesay
      command: [cowsay]
      args: ["{{inputs.parameters.message}}"]

Referencing other ClusterWorkflowTemplates

You can reference templates from other ClusterWorkflowTemplates using a templateRef field with clusterScope: true . Just as how you reference other templates within the same Workflow, you should do so from a steps or dag template.

Here is an example:

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: workflow-template-hello-world-
spec:
  entrypoint: whalesay
  templates:
  - name: whalesay
    steps:                              # You should only reference external "templates" in a "steps" or "dag" "template".
      - - name: call-whalesay-template
          templateRef:                  # You can reference a "template" from another "WorkflowTemplate or ClusterWorkflowTemplate" using this field
            name: cluster-workflow-template-whalesay-template   # This is the name of the "WorkflowTemplate or ClusterWorkflowTemplate" CRD that contains the "template" you want
            template: whalesay-template # This is the name of the "template" you want to reference
            clusterScope: true          # This field indicates this templateRef is pointing ClusterWorkflowTemplate
          arguments:                    # You can pass in arguments as normal
            parameters:
            - name: message
              value: "hello world"

2.9 and after

Create Workflow from ClusterWorkflowTemplate Spec

You can create Workflow from ClusterWorkflowTemplate spec using workflowTemplateRef with clusterScope: true. If you pass the arguments to created Workflow, it will be merged with cluster workflow template arguments

Here is an example for ClusterWorkflowTemplate with entrypoint and arguments

apiVersion: argoproj.io/v1alpha1
kind: ClusterWorkflowTemplate
metadata:
  name: cluster-workflow-template-submittable
spec:
  entrypoint: whalesay-template
  arguments:
    parameters:
      - name: message
        value: hello world
  templates:
    - name: whalesay-template
      inputs:
        parameters:
          - name: message
      container:
        image: docker/whalesay
        command: [cowsay]
        args: ["{{inputs.parameters.message}}"]

Here is an example for creating ClusterWorkflowTemplate as Workflow with passing entrypoint and arguments to ClusterWorkflowTemplate

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: cluster-workflow-template-hello-world-
spec:
  entrypoint: whalesay-template
  arguments:
    parameters:
      - name: message
        value: "from workflow"
  workflowTemplateRef:
    name: cluster-workflow-template-submittable
    clusterScope: true

Here is an example of a creating WorkflowTemplate as Workflow and using WorkflowTemplates's entrypoint and Workflow Arguments

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: cluster-workflow-template-hello-world-
spec:
  workflowTemplateRef:
    name: cluster-workflow-template-submittable
    clusterScope: true

Managing ClusterWorkflowTemplates

CLI

You can create some example templates as follows:

argo cluster-template create https://raw.githubusercontent.com/argoproj/argo-workflows/master/examples/cluster-workflow-template/clustertemplates.yaml

The submit a workflow using one of those templates:

argo submit https://raw.githubusercontent.com/argoproj/argo-workflows/master/examples/cluster-workflow-template/cluster-wftmpl-dag.yaml

2.7 and after

The submit a ClusterWorkflowTemplate as a Workflow:

argo submit --from clusterworkflowtemplate/workflow-template-submittable

kubectl

Using kubectl apply -f and kubectl get cwft

UI

ClusterWorkflowTemplate resources can also be managed by the UI

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