What else is needed besides a Docker container to run a service in Kubernetes?

To run a service in Kubernetes, in addition to a Docker container, the following components are required:

• Kubernetes manifests — YAML files describing Kubernetes objects such as Pod, Deployment, Service, and others.
• Deployment — manages the creation and updating of Pods with containers.
• Service — provides stable access to Pods, balancing the load.
• ConfigMap and Secret — for passing configurations and secret data to containers.
• Volume — if persistent data storage is needed.

Example of a simple Deployment to run a container:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-service
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-service
  template:
    metadata:
      labels:
        app: my-service
    spec:
      containers:
      - name: my-service-container
        image: my-service-image:latest
        ports:
        - containerPort: 8080

Thus, a Docker container is just an image, and to run it in Kubernetes, you need to describe how and where this image will operate.