raynix 筆記

How to Allow and Respect Differences in ArgoCD

I’ve been using ArgoCD as my GitOps toolkit for my Kubernetes home lab for many years, nothing major to complain. I wanted to test canary deployment with Argo Rollouts with which Istio is supported. However Argo Rollouts is not really GitOps friendly – it modifies weight of routes without commit to git repository, to gradually rollout a new release.

In order to get these 3 to work together, ArgoCD needs to stay cool and ignore the weight changes done by Argo Rollouts. Here’s how I did it with ArgoCD’s global configuration(argocd-cm config map):

  # argocd-cm
  data:
    resource.customizations.ignoreDifferences.networking.istio.io_VirtualService: |-
      jqPathExpressions:
        - ".spec.http[]?.route[]?.weight"

And to make sure the weight will not be wiped back to its original value during a sync, an options is needed for the ArgoCD application:

# in an ArgoCD Application
spec:
  syncPolicy:
    syncOptions:
      - RespectIgnoreDifferences=true

I also restarted the repo servers to make sure the new configurations are loaded.

k rollout restart deploy argocd-repo-server

Ref.

🙂

admin

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