How to set a backup node?

[austinguish]

Hi, everyone. When I set a DAG with the argo-workflows, I have a question that how to set a node as a backup when some nodes dead(get some errors).
For example:
A
/ \
B C Back
\ / /
D
only the C get error, the Back instead of.
Thanks!!!

[terrytangyuan]

Exit handlers might be what you need, see an example here. You can reference the status of nodes in a variable {{workflow.status}} as part of the when condition. There are also examples to do this at either step or DAG level:

• https://github.com/argoproj/argo-workflows/blob/master/examples/exit-handler-dag-level.yaml
• https://github.com/argoproj/argo-workflows/blob/master/examples/exit-handler-step-level.yaml

[austinguish]

Thank u, I'll try it!