Demo Template Script

In this lesson we examine a script template example in Argo Workflows. This workflow demonstrates a simple script template that runs a short Python script inside a container image. The script’s stdout is captured and exposed as the template output (outputs.result), allowing later steps to consume the result. What this workflow demonstrates

Using metadata.generateName to create a unique workflow name with the prefix random-number-.
Defining a single entrypoint (random-number) that uses a script template.
Supplying an inline script via the source field; the script runs inside the specified container image.
Capturing the script stdout and exposing it as the template output.

Example Workflow (YAML)

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: random-number-
spec:
  entrypoint: random-number
  templates:
  - name: random-number
    script:
      image: python:3.6-alpine
      command: [python]
      source: |
        import random
        i = random.randint(100, 2000)
        print(i)

Fields explained

Field	Purpose	Example
metadata.generateName	Create a unique workflow name using a fixed prefix	`random-number-`
spec.entrypoint	The template that starts execution	`random-number`
script.image	Container image that runs the script	`python:3.6-alpine`
script.command	Command invoked to execute the script	`[python]`
script.source	Inline script text written to a file and executed inside the image; stdout is captured as the template output	The Python code shown above

How the script template works

The text in script.source is written into a temporary file inside the container.
The container executes the script using the specified command and image.
Anything printed to stdout by the script is captured by Argo and made available as outputs.result, which you can reference in later templates using standard Argo templating.

Run the workflow

From the Argo Web UI: paste the YAML and submit. Optionally switch to the Graph view to see a single node representing the random-number template.
From the cluster using kubectl:

kubectl apply -f random-number-workflow.yaml

Using the Argo CLI (if installed):

argo submit --watch random-number-workflow.yaml

View logs and outputs

In the UI, open the workflow, click the node, then click Logs to inspect stdout.
With the Argo CLI, you can stream logs (replace the workflow name as appropriate):

argo logs <workflow-name> --follow

Example node output (the workflow prints a randomly chosen integer):

A browser screenshot of the Argo Workflows web UI showing a single completed workflow node labeled "random-number-7krn6" with a green checkmark. The top toolbar shows buttons like Resubmit, Delete, Logs, Share, and a vertical icon sidebar runs down the left.

The stdout of a script template is captured and available as the template output (outputs.result). Reference it in subsequent templates using Argo’s templating syntax to pass values between steps.

Watch Video

Demo Parameters

Demo Template Steps

ArgoCD

Argo Workflow

Argo Rollouts

Argo Events

Introduction

Demo Template Script

Watch Video