kubectl patch existing container command-CodePudding

I have a Kubernetes deployment up and running: (some fields omitted for brevity)

apiVersion: apps/v1
kind: Deployment
metadata:
  name: argocd-server
  namespace: argocd
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: argocd-server
  template:
    metadata:
      creationTimestamp: null
      labels:
        app.kubernetes.io/name: argocd-server
    spec:
      containers:
        - name: argocd-server
          image: quay.io/argoproj/argocd:v2.2.5
          command:
            - argocd-server

I would like to create a patch for the existing deployment to add certain arguements to the command of the container:

            - '--insecure'
            - '--basehref'
            - /argocd

I read the documentation on the kubectl patch command here, but I am not sure how to actually select the container (by name or index) that I would like to patch.
It would be fine to overwrite the complete command: list (giving the - argocd-server line in the patch file) but I would like to prevent giving the complete containers: spec in the patch file.

CodePudding user response：

You can select the container by index, e.g.:

kubectl patch deployment argocd-server -n argocd --type='json' -p='[{"op": "replace", "path": "/spec/template/spec/containers/0/command", "value": ["argocd-server", "--insecure"]}]'

CodePudding user response：

Thanks to the inspiration by @Blokje5 I was able to construct these two options:

JSON approach

inline

kubectl patch deployment argocd-server -n argocd --type='json' -p='[{"op": "replace", "path": "/spec/template/spec/containers/0/command", "value": ["argocd-server", "--insecure", "--basehref", "/argocd"]}]'

with patch file

patch.json

[
  {
    "op": "replace",
    "path": "/spec/template/spec/containers/0/command",
    "value": [
      "argocd-server",
      "--insecure",
      "--basehref",
      "/argocd"
    ]
  }
]

kubectl -n argocd patch deployment argocd-server --type='json' --patch-file patch.json

YAML approach

yaml file

patch.yaml

---
op: replace
spec:
  template:
    spec:
      containers:
        - name: argocd-server
          command:
            - argocd-server
            - --insecure
            - --basehref
            - /argocd

kubectl -n argocd patch deployment argocd-server --patch-file patch.yaml