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101 Argo Workflows

Introduction

kubectl create namespace argo
kubectl apply -n argo -f "https://github.com/argoproj/argo-workflows/releases/download/v3.7.6/install.yaml"

kubectl -n argo get all
NAME                                      READY   STATUS    RESTARTS   AGE
pod/argo-server-c4c544bdc-8cn2n           1/1     Running   0          3h42m
pod/httpbin-f5ccc9c6-xfj7q                1/1     Running   0          3h42m
pod/minio-5877d79784-tx2g2                1/1     Running   0          3h42m
pod/workflow-controller-cf96fc675-lkcgn   1/1     Running   0          3h42m

NAME                  TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)             AGE
service/argo-server   ClusterIP   10.96.43.154   <none>        2746/TCP            3h42m
service/httpbin       ClusterIP   10.96.249.74   <none>        9100/TCP            3h42m
service/minio         ClusterIP   10.96.53.221   <none>        9000/TCP,9001/TCP   3h42m

NAME                                  READY   UP-TO-DATE   AVAILABLE   AGE
deployment.apps/argo-server           1/1     1            1           3h42m
deployment.apps/httpbin               1/1     1            1           3h42m
deployment.apps/minio                 1/1     1            1           3h42m
deployment.apps/workflow-controller   1/1     1            1           3h42m

NAME                                            DESIRED   CURRENT   READY   AGE
replicaset.apps/argo-server-c4c544bdc           1         1         1       3h42m
replicaset.apps/httpbin-f5ccc9c6                1         1         1       3h42m
replicaset.apps/minio-5877d79784                1         1         1       3h42m
replicaset.apps/workflow-controller-cf96fc675   1         1         1       3h42m

kubectl patch deployment argo-server -n argo --type='json' -p '[{"op": "replace", "path": "/spec/template/spec/containers/0/args", "value": ["server", "--auth-mode=server"]}]'

kubectl -n argo port-forward service/argo-server 2746:2746

WORKFLOW EXAMPLE

argo submit -n argo --watch https://raw.githubusercontent.com/argoproj/argo-workflows/main/examples/hello-world.yaml

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: hello-world-
  labels:
    workflows.argoproj.io/archive-strategy: "false"
  annotations:
    workflows.argoproj.io/description: |
      This is a simple hello world example.
spec:
  entrypoint: hello-world
  templates:
  - name: hello-world
    container:
      image: busybox
      command: [echo]
      args: ["hello world"]

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: cowsay-
spec:
  entrypoint: cowsay-template
  templates:
  - name: cowsay-template
    container:
      image: rancher/cowsay
      command: [cowsay]
      args: ["Argo Workflow"]

Edit the cowsay-workflow.yaml to have the following:

apiVersion: argoproj.io/v1alpha1 kind: Workflow metadata: generateName: cowsay- namespace: argo spec: entrypoint: cowsay arguments: parameters: - name: message value: "a message from the workflow arguments section" templates: - name: cowsay inputs: parameters: - name: message container: image: rancher/cowsay command: ["cowsay"] args: ["{{inputs.parameters.message}}"] Submit and watch the workflow:

argo submit cowsay-workflow.yml -n argo --watch Verify logs contain the workflow argument content using the following command:

argo -n argo logs @latest

Submit the workflow with a parameter override and monitor its progress using the following command:

argo submit -n argo cowsay-workflow.yml --watch -p message="With great power comes great responsibility" After submission, verify that the latest logs display the overridden value by executing:

argo -n argo logs @latest

apiVersion: argoproj.io/v1alpha1 kind: Workflow metadata: generateName: cosmic-moo- spec: entrypoint: triple-moo templates: - name: triple-moo steps: - - name: first-moo template: cow-says arguments: parameters: - name: message value: "Welcome to the Cosmic Ranch!" - - name: parallel-moo-a template: cow-says arguments: parameters: - name: message value: "Greetings from Galaxy Moo!" - name: parallel-moo-b template: cow-says arguments: parameters: - name: message value: "Hello from the Milky Whey!"

  • name: cow-says inputs: parameters:
    • name: message container: image: rancher/cowsay command: ["cowsay"] args: ["{{inputs.parameters.message}}"]

argo -n argo get @latest

PARAMETERS

GOTASK 
version: '3'

set: [errexit, pipefail]

# VARIABLES ########################################################################################

# INCLUDES #########################################################################################

includes:

# MAIN #############################################################################################

tasks:
  default:
    desc: ""
    summary: ""
    aliases: [setup, init]
    cmds:
      - task: argo-workflows:main

  argo-workflows:main:
    desc: ""
    summary: ""
    cmds:
      - echo ""
      - task: required:main

https://argo-workflows.readthedocs.io/en/latest/