Cmd

Dockerfile 에서 RUN, CMD, ENTRYPOINT 차이 RUN - 도커이미지 생성시 동작 CMD - 도커이미지 실행시 동작 (대체 가능) ENTRYPOINT - CMD와 같으나 실행시 반드시 동작 Dockerfile - RUN # create log script vi log-event.sh ... #!/bin/sh echo `date` $@ >> log.txt cat log.txt ... chmod u+x log-event.sh # create Docker Image vi Dockerfile ... FROM alpine ADD log-event.sh / RUN ["/log-event.sh","image created"] # 생성시 동작 CMD ["/log-event.sh","container started"] # 실행시 동작 ... docker build -t myimage . # Run Docker Image - RUN은 이미지 생성시에 동작했음을 알 수 있다. docker run myimage Wed Sep 27 07:10:26 UTC 2023 image created Wed Sep 27 07:36:10 UTC 2023 container started docker run myimage Wed Sep 27 07:10:26 UTC 2023 image created Wed Sep 27 07:36:21 UTC 2023 container started Dockerfile - CMD, ENTRYPOINT 여러개의 CMD # Create Docker Image vi Dockerfile ... FROM alpine ADD log-event.sh / RUN ["/log-event.sh","image created"] # 생성시 동작 CMD ["/log-event.sh","container started"] # 실행시 동작 (무시됨) CMD ["/log-event.sh","container running"] # 실행시 동작 (마지막CMD처리) ... docker build -t myimage . # Run Docker Image docker run myimage Wed Sep 27 07:10:26 UTC 2023 image created Wed Sep 27 07:23:09 UTC 2023 container running CMD와 ENTRYPOINT # Create Docker Image vi Dockerfile ... FROM alpine ADD log-event.sh / RUN ["/log-event.sh","image created"] # 생성시 동작 ENTRYPOINT ["/log-event.sh"] # 실행시 동작 CMD ["container started"] # 실행시 동작 ... docker build -t myimage . # Run Docker Image docker run myimage Wed Sep 27 07:10:26 UTC 2023 image created Wed Sep 27 07:23:09 UTC 2023 container started # Run Docker Image with argument docker run myimage custom event Wed Sep 27 07:10:26 UTC 2023 image created Wed Sep 27 07:24:31 UTC 2023 custom event REFERENCE Difference Between run, cmd and entrypoint in a Dockerfile - https://www.baeldung.com/ops/dockerfile-run-cmd-entrypoint Entrypoint vs cmd - https://bluese05.tistory.com/77