K8s Pod Command Override

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K8S POD Command Override OCR

docker Entrypoint vs k8s command

docker k8s
entry ENTRYPOINT command
arguments CMD args

k8s command and args override the default OCR Entrypoint and Cmd

Dockerfile

FROM alpine:3.8
RUN apk add --no-cache curl ethtool && rm -rf /var/cache/apk/*
CMD ["--version"]
ENTRYPOINT ["curl"]

cmd-override-pod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: command-override
  labels:
    purpose: override-command
spec:
  containers:
  - name: command-override-container
    image: bigo/curl:v1
    command: ["curl"]
    args: ["--help"]
  restartPolicy: Never

docker run -it bigo/curl:v1
curl 7.61.1 (x86_64-alpine-linux-musl) libcurl/7.61.1 LibreSSL/2.0.0 zlib/1.2.11 libssh2/1.8.0 nghttp2/1.32.0
Release-Date: 2018-09-05

kubectl apply -f cmd-override-pod.yaml
kubectl logs command-override

Usage: curl [options...] <url>
     --abstract-unix-socket <path> Connect via abstract Unix domain socket
     --anyauth       Pick any authentication method
 -a, --append        Append to target file when uploading
K8S

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