Commands and arguments

As most applications run as containers when deployed in a K8s cluster, one can define custom commands and arguments to run the container.

In this sense, a parallel can be drawn to configuring a container in docker:

In Docker	In K8s config	What it does
`CMD`	`args`	Command that will be executed when the container starts or alternatively arguments for the `ENTRYPOINT` of the container
`ENTRYPOINT`	`command`	Specifies the command to run when the container starts (completely replacing Dockerfile `ENTRYPOINT`).

For example

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
  labels:
    app: nginx 
spec:
  containers:
    - name: nginx-container
      image: nginx
      command:
        - sleep # Override default ENTRYPOINT
      args:
        - "5" # Pass 5 as the arg for sleep