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For testing purpose, I want to keep things simple and run a Python Docker image on Kubernetes. So I used a Pod as smallest unit, based on the official template from the Kubernetes docs:

apiVersion: v1
kind: Pod
metadata:
  name: my-app
  labels:
    app: my-app
spec:
  containers:
  - name: my-app
    image: my-local.registry/my-app-image:0.1
    imagePullPolicy: IfNotPresent

But this Pod doesn't start and create a lot of errors like this:

Warning FailedCreatePodSandBox 2m41s kubelet, k8sw01 Failed create pod sandbox: rpc error: code = Unknown desc = failed to set up sandbox container "d2e6c36361b19e39b908422f17ba1a7d2cb8dfd53fcd4822f409848f99ec7b50" network for pod "my-app": NetworkPlugin cni failed to set up pod "my-app_my-app" network: connection is unauthorized

But when running the same container as a deployment, it works fine:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
  labels:
    app: my-app
spec:
  replicas: 1
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-app
        image: my-local.registry/my-app-image:0.1
        imagePullPolicy: IfNotPresent

I compared the generated pod from the Deployment with my standalone Pod and couldn't find noticeable, not-generated attributes which I miss. The registry is a self hosted instance of the Docker registry helm chart without authentication.

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