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(/questions/ask) Ask Question     (2022-11-03 11:43:38Z) Asked 1 year, 10 months ago  Modified (?lastactivity) (2022-11-03 13:07:52Z) 1 year, 10 months ago  (Viewed 1,654 times) Viewed 2k times         This question shows research effort; it is useful and clear  (70:3:31e,16:5cc4fd1377339115,10:1725245602,16:523eb5504337c528,8:74302503,db54ce5bbaa8e262c1c02059426b34b9fa6d5a054ea91bbb008e3f2d3479fa8f) 0  (This question does not show any research effort; it is unclear or not useful)    (70:3:31e,16:14018469780838ef,10:1725245602,16:2ab620aea6d51fd1,8:74302503,28e107ff73cdb3125e545b3b6d30175d7857cc18084fba9b7b95b2e3c353d22e)      Save this question.  (/posts/74302503/timeline)    Show activity on this post.    I am migrating some web-apps to be managed via docker compose It seems the docker-compose.yaml has a section for the container entry-point. However, my individual docker files have an ENTRYPOINT themselves... should I remove this from the Dockerfiles? Does the entry-point in docker-compose override the Docker one?  (/questions/tagged/docker) (show questions tagged 'docker') docker  (/questions/tagged/docker-compose) (show questions tagged 'docker-compose') docker-compose      (/q/74302503) (Short permalink to this question) Share  Share a link to this question     Copy link (https://creativecommons.org/licenses/by-sa/4.0/) (The current license for this post: CC BY-SA 4.0) CC BY-SA 4.0     (/posts/74302503/edit) () Improve this question  Follow (70:3:31e,16:1ce34875ffd58597,10:1725245602,16:57871b77758b4107,8:74302503,e4c6d559ed02d761adb0d4339e5ecbccc72e1d94c492b54fbb4a3101c681fecd)  Follow this question to receive notifications       asked (2022-11-03 11:43:38Z) Nov 3, 2022 at 11:43   (/users/17194313/myk) (MYK's user avatar)    (/users/17194313/myk) MYK MYK (reputation score) 2,687 (3 gold badges)  3  3 gold badges (15 silver badges)  15  15 silver badges (56 bronze badges)  56  56 bronze badges        2   docker-compose entrypoint overrides the docker image's entrypoint. You do not have to use the docker-compose entrypoint. – (/users/11115012/daniel-juravski) (181 reputation) Daniel Juravski  Commented (2022-11-03 11:58:02Z, License: CC BY-SA 4.0) Nov 3, 2022 at 11:58        No and yes are the answers to the two questions. The exact term to use here is that you may define an entrypoint to override the default one (as you would do directly on the docker command of needed) – (/users/9401096/zeitounator) (43,358 reputation) Zeitounator  Commented (2022-11-03 11:58:08Z, License: CC BY-SA 4.0) Nov 3, 2022 at 11:58        (Use comments to ask for more information or suggest improvements. Avoid answering questions in comments.) Add a comment |  (Expand to show all comments on this post)          1 Answer 1   Sorted by:  (/questions/74302503/should-dockerfiles-specify-an-entry-point-when-using-docker-compose?answertab=scoredesc#tab-top) Reset to default   (scoredesc) Highest score (default)  (trending) Trending (recent votes count more)  (modifieddesc) Date modified (newest first)  (createdasc) Date created (oldest first)            This answer is useful  (70:3:31e,16:53b65afa9e5447dd,10:1725245602,16:fce9b759f9853293,8:74303581,9feec2725794f1c8e8593e32f854cafe146f5930499c59bafcae5afb3a68f074) 1  (This answer is not useful)    (70:3:31e,16:982da2c754f7796b,10:1725245602,16:d2573cfe1746053d,8:74303581,7bb896ef3c24767e78bc9a5452f3190295f561b0aea0c5d3487addd86e5c1ab3)      Save this answer.  (Loading when this answer was accepted…)     (/posts/74303581/timeline)    Show activity on this post.    You usually shouldn't specify entrypoint: or command: in a Compose file.  Prefer specifying these in a Dockerfile.  The one big exception is if you have a container that can do multiple things (for example, it can be both a Web server and a queue worker, with the same code) and you need to tell it with a command: to do not-the-default thing. I'd suggest a typical setup like: # docker-compose.yml version: '3.8' services: app: build: . # with neither entrypoint: nor command:   # Dockerfile FROM ...
WORKDIR /app
COPY ...
RUN ... # ENTRYPOINT ["./entrypoint-wrapper.sh"] CMD ["./my_app" ]   Compose entrypoint: overrides the Dockerfile ENTRYPOINT and resets the CMD .  Compose command: overrides the Dockerfile CMD . In the Dockerfile both ENTRYPOINT and CMD are optional.  If your base image already includes a correct command setup (nginx , php:fpm ) then you can safely skip both. It's otherwise somewhat a matter of style whether to use CMD or ENTRYPOINT in your Dockerfile.  I prefer CMD for two reasons: it's easier to replace in a docker run ... image-name alternate command invocation, and there's a pattern of using ENTRYPOINT as a wrapper script to do first-time setup and then launch the CMD with exec "$@" .  If you have a JSON-array-syntax ENTRYPOINT then you can pass additional command-line arguments to it as docker run ... image-name --option .  Both setups are commonplace. The thing you shouldn't do is put an interpreter in ENTRYPOINT and a script name in CMD .  I only ever see this in Python, but ENTRYPOINT ["python3"] is wrong.  On the one hand this is hard to override in the same way ENTRYPOINT is in general, and on the other neither normal command override format works (you still have to repeat the script name if you want to run the same script with different options).   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