New Sync Option DeleteResourceBeforeCreation

[in-cloud-opensource]

Summary

The proposal introduces a new sync option to control resource deletion before creation

Motivation

Working with K8 jobs can be a nightmare especially when updating the job command due to its immutable nature. When using jobs as resource hooks ArgoCD already supports the great feature of different hook deletion policies. In some cases, it might not be possible to run jobs as hooks and must be managed during the normal sync lifecycle. To ease this as it is already possible with hooks, we propose to introduce a new sync option DeleteResourceBeforeCreation that can be applied to all resources during the normal sync process.

We also considered using ttlSecondsAfterFinished to delete the job after a certain amount of time after job completion. But with active self-healing, ArgoCD will automatically recreate the deleted job, which does not work for us.

Furthermore, we also investigated the usage of sync option argocd.argoproj.io/sync-options: Replace=true, but doesn’t work since updating a job with replace only works when run with --force, which is currently only supported via the UI.

Proposal

Introduce a new sync option argocd.argoproj.io/sync-options: DeleteResourceBeforeCreation to control resource deletion.

apiVersion: batch/v1
kind: Job
metadata:  
  annotations:
    argocd.argoproj.io/sync-options: DeleteResourceBeforeCreation=true
...

Releated Issues

This enhancement is related to #5882

[beatrausch]

Relates also to #7459