It was written if I read the document properly. However, it seems easy to make a mistake, so make a note.
――What to read properly - https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/ - https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/#notes
--The command in the manifest is the ENTRY POINT in the Dockerfile. --Manifest args is CMD in Dockerfile
apiVersion: v1
kind: Pod
metadata:
name: command-demo
labels:
purpose: demonstrate-command
spec:
containers:
- name: command-demo-container
image: debian
command: ["printenv"] #This is ENTRY POINT
args: ["HOSTNAME", "KUBERNETES_PORT"] #This is CMD
restartPolicy: OnFailure
Also note that the behavior changes depending on whether command and args are defined respectively.
Dockerfile
If
| command | args | Command to be executed |
|---|---|---|
| undefined | undefined | echo HOSTNAME |
| printenv | undefined | printenv |
| undefined | KUBERNETES_PORT | echo KUBERNETES_PORT |
| printenv | KUBERNETES_PORT | printenv KUBERNETES_PORT |
Will be.
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