Steps for Applying YAML to a Running Container

1. Check the current context

   k config current-context

2. Get all the pods in the context

   k get pods

3. Get the names of all the containers running in the pod

   k get pod <pod-name> -o=jsonpath='{.spec.containers[*].name}'

4. Initialise a $yaml variable which has the yaml content, which is being applied.

   $yaml = @"
    apiVersion: networking.istio.io/v1alpha3
    kind: ServiceEntry
    metadata:
    name: httpbin-ext
    spec:
    hosts:
    - httpbin.org
      ports:
    - number: 80
      name: http
      protocol: HTTP
      resolution: DNS
      location: MESH_EXTERNAL"@

5. Apply the above variable to the container

   $yaml | k apply -f -

6. Now exec the command by connecting to the container's shell

   k exec my-pod -c my-container -- curl -sS http://httpbin.org/headers

7. Now tail the container's log using the container logs

   k logs "$SOURCE_POD" -c my-container | tail

reference

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