I'm trying out Argo workflow and would like to understand how to freeze a step. Let's say that I have 3 step workflow and a workflow failed at step 2. So I'd like to resubmit the workflow from step 2 using successful step 1's artifact. How can I achieve this? I couldn't find the guidance anywhere on the document.
I think you should consider using Conditions and Artifact passing in your steps.
Conditionals provide a way to affect the control flow of a workflow at runtime, depending on parameters. In this example the 'print-hello' template may or may not be executed depending on the input parameter, 'should-print'. When submitted with
$ argo submit examples/conditionals.yamlthe step will be skipped since 'should-print' will evaluate false. When submitted with:
$ argo submit examples/conditionals.yaml -p should-print=truethe step will be executed since 'should-print' will evaluate true.
apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
generateName: conditional-
spec:
entrypoint: conditional-example
arguments:
parameters:
- name: should-print
value: "false"
templates:
- name: conditional-example
inputs:
parameters:
- name: should-print
steps:
- - name: print-hello
template: whalesay
when: "{{inputs.parameters.should-print}} == true"
- name: whalesay
container:
image: docker/whalesay:latest
command: [sh, -c]
args: ["cowsay hello"]If you use conditions in each step you will be able to start from a step you like with appropriate condition.
Also have a loot at this article Argo: Workflow Engine for Kubernetes as author explains the use of conditions on coinflip example. You can see many examples on their GitHub page.