I'm trying to see if there's a way to apply a kustomize patchTransformer to a specific container in a pod other than using its array index. For example, if I have 3 containers in a pod, (0, 1, 2) and I want to patch container "1" I would normally do something like this:
patch: |-
- op: add
path: /spec/containers/1/command
value: ["sh", "-c", "tail -f /dev/null"]
That is heavily dependent on that container order remaining static. If container "1" is removed for whatever reason, the array is reshuffled and container "2" suddenly becomes container "1", making my patch no longer applicable.
Is there a way to patch by name, or target a label/annotation, or some other mechanism?
path: /spec/containers/${NAME_OF_CONTAINER}/commandAny insight is greatly appreciated.
This is more of a Json6902 patch limitation together with the fact that containers are defined in a K8s pod as an Array and not a Hash where something like this would work:
path: /spec/containers/${NAME_OF_CONTAINER}/commandYou could just try a StrategicMergePatch. which essentially what kubectl apply does.
cat <<EOF > deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-app
spec:
selector:
matchLabels:
run: my-app
replicas: 2
template:
metadata:
labels:
run: my-app
spec:
containers:
- name: my-container
image: myimage
ports:
- containerPort: 80
EOFcat <<EOF > set_command.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-nginx
spec:
template:
spec:
containers:
- name: my-app
command: ["sh", "-c", "tail -f /dev/null"]
EOFcat <<EOF >./kustomization.yaml
resources:
- deployment.yaml
patchesStrategicMerge:
- set_command.yaml
EOF✌️