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                    points before being able to upvote. Upvoting indicates when questions and answers are useful. (https://stackoverflow.com/help/whats-reputation) What's reputation and how do I get it?  Instead, you can save this post to reference later.    Save this post for later Not now         (https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon.png?v=c78bd457575a) (/questions/47615751/docker-compose-run-a-script-after-container-has-started) docker-compose, run a script after container has started?  (/questions/ask) Ask Question     (2017-12-03 06:03:47Z) Asked 7 years, 2 months ago  Modified (?lastactivity) (2025-01-26 08:33:16Z) 29 days ago  (Viewed 424,387 times) Viewed 424k times         This question shows research effort; it is useful and clear  (70:3:31e,16:b01d1394eac920af,10:1740393669,16:676f0f0ca6ed4a8d,8:47615751,f9d727619f1f60bd9d7194f710aabea6e7543fc7ce38337f0618a67b96554af5) 190  (This question does not show any research effort; it is unclear or not useful)    (70:3:31e,16:00d4bafd33e4c1bf,10:1740393669,16:10945490a42de897,8:47615751,da0808df3ddbda8c73932989fcea82e9b48a66c3487a51791371dfe196ee2b18)      Save this question.  (/posts/47615751/timeline)    Show activity on this post.    I have a service that I am bringing up through Rancher via docker-compose. The issue I am running into is that I need to set a password after the container has been deployed. The way rancher secrets work, is that I set my secret in and rancher will mount a volume on my container with a file containing my secret. I was hoping to be able to execute a script to grab that secret, and set it as a password on my config file. I don't believe I have a way to get that secret in through the Dockerfile as I don't want the secret to be in git, so I'm left looking at doing it via docker-compose. Does anyone know if this is possible?  (/questions/tagged/docker) (show questions tagged 'docker') docker  (/questions/tagged/docker-compose) (show questions tagged 'docker-compose') docker-compose  (/questions/tagged/dockerfile) (show questions tagged 'dockerfile') dockerfile  (/questions/tagged/rancher) (show questions tagged 'rancher') rancher      (/q/47615751) (Short permalink to this question) Share  Share a link to this question     Copy link (https://creativecommons.org/licenses/by-sa/3.0/) (The current license for this post: CC BY-SA 3.0) CC BY-SA 3.0     (/posts/47615751/edit) () Improve this question  Follow (70:3:31e,16:bb748dfeebff83b8,10:1740393669,16:ae0338caf14860a5,8:47615751,2627a3cbc3db5b8b9036c25c8996a98b7899cc4b755fad4f3d7713ade2e1cd3c)  Follow this question to receive notifications       asked (2017-12-03 06:03:47Z) Dec 3, 2017 at 6:03   (/users/6726990/blooze) (Blooze's user avatar)    (/users/6726990/blooze) Blooze Blooze (reputation score) 2,267 (4 gold badges)  4  4 gold badges (18 silver badges)  18  18 silver badges (19 bronze badges)  19  19 bronze badges        3   Absolutely, that's a fairly normal way of setting secrets. Just add the relevant shell script as (or to) your CMD or ENTRYPOINT. – (/users/3195526/paul-hicks) (14,009 reputation) Paul Hicks  Commented (2017-12-03 06:06:38Z, License: CC BY-SA 3.0) Dec 3, 2017 at 6:06        to have access to secret without expose in Dockerfile, you can use .env file with docker-compose : (https://docs.docker.com/compose/environment-variables/) docs.docker.com/compose/environment-variables  – (/users/6614155/bcag2) (2,439 reputation) bcag2  Commented (2021-08-03 16:33:12Z, License: CC BY-SA 4.0) Aug 3, 2021 at 16:33      (number of 'useful comment' votes received) 1   Hi. This is specific problem. The way to use a separate service as a set UP service is working solution. But often images provide you some sort of the 'hooks' that can be used. Like (https://github.com/bitnami/bitnami-docker-kafka/blob/master/3.1/debian-10/rootfs/opt/bitnami/scripts/libkafka.sh#L768) here for kafka. You need just put a scripts to the "docker-entrypoint-initdb.d" to run some sort of set up. – (/users/3549038/stopanko) (336 reputation) stopanko  Commented (2022-04-07 17:42:50Z, License: CC BY-SA 4.0) Apr 7, 2022 at 17:42        (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)          6 Answers 6   Sorted by:  (/questions/47615751/docker-compose-run-a-script-after-container-has-started?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,16:41f058b8f6468cff,10:1740393669,16:d4651c5b493d556c,8:64153124,934b983d3331c2a036f87048b6ea08e7519cc937a1571cd21ef996e4b7f994cc) 115  (This answer is not useful)    (70:3:31e,16:1994879f5c0efac0,10:1740393669,16:d390ea2ec695ec35,8:64153124,3e3a5149c71c7fcddb52a32611068eefea2883c2135c11fd818157c3981accb7)      Save this answer.  (Loading when this answer was accepted…)     (/posts/64153124/timeline)    Show activity on this post.    This is the way I use for calling a script after a container is started without overriding the entrypoint. In my example, I used it for initializing the replicaset of my local MongoDB services: mongo: image: mongo:4.2.8 hostname: mongo container_name: mongodb entrypoint: ["/usr/bin/mongod" ,"--bind_ip_all" ,"--replSet" ,"rs0" ] ports: - 27017 :27017 mongosetup: image: mongo:4.2.8 depends_on: - mongo restart: "no" entrypoint: [ "bash" , "-c" , "sleep 10 && mongo --host mongo:27017 --eval 'rs.initiate()'" ]   In the first part, I simply launch my service (mongo) The second service use a "bash" entry point AND a restart: no <= important   I also use a depends_on between service and setup service for manage the launch order.   (/a/64153124) (Short permalink to this answer) Share  Share a link to this answer     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/64153124/edit) () Improve this answer  Follow (70:3:31e,16:212bf3e20bb261fe,10:1740393669,16:d8c5a391da3f894a,8:64153124,9ccc725b146ab4b2d579bcc340812e0efd5884e9b8c5ca36bbbbf489eb0cee6e)  Follow this answer to receive notifications       (/posts/64153124/revisions) (show all edits to this post) edited (2021-02-15 22:30:57Z) Feb 15, 2021 at 22:30    (/users/2831606/redgeoff) (redgeoff's user avatar)    (/users/2831606/redgeoff) redgeoff (reputation score) 3,341 (1 gold badge)  1  1 gold badge (28 silver badges)  28  28 silver badges (41 bronze badges)  41  41 bronze badges     answered (2020-10-01 10:02:42Z) Oct 1, 2020 at 10:02   (/users/11125845/gibson-lunaziz) (Gibson Lunaziz's user avatar)    (/users/11125845/gibson-lunaziz) Gibson Lunaziz Gibson Lunaziz (reputation score) 1,173 (1 gold badge)  1  1 gold badge (7 silver badges)  7  7 silver badges (8 bronze badges)  8  8 bronze badges        5 (number of 'useful comment' votes received) 5   This approach seems interesting but for me raises some questions. First, why use the mongo image for the mongosetup container? Will just any image do? Or is it important that it should be the mongo one? Second, you say that setting restart: no is important, but why is that? So that setup does not get executed multiple times? Last, I see sleep 10 ? Is that to give mongo time to initialize? Seems tricky to use sleep for that... – (/users/286685/stijn-de-witt) (42,114 reputation) Stijn de Witt  Commented (2022-04-06 07:45:31Z, License: CC BY-SA 4.0) Apr 6, 2022 at 7:45      (number of 'useful comment' votes received) 1   @StijndeWitt   1. "Why use mongo image?"  because the command mongo --host mongo:27017 --eval 'rs.initiate()' which is the 4th element of mongosetup.entrypoint property in the above  docker-compose, uses mongo which is a cli program (mongosh also can be used as a newer alternative) and this program is pre-installed on mongo images. – (/users/2605781/gandalf) (3,257 reputation) Gandalf  Commented (2022-06-25 14:43:34Z, License: CC BY-SA 4.0) Jun 25, 2022 at 14:43   (this comment was edited 3 times)        (number of 'useful comment' votes received) 1   @StijndeWitt 2. "you say that setting restart: no is important, but why is that?" because as the name for this container suggests, this container is for  setting up replica set for mongo, which means just running the mongo --host mongo:27017 --eval 'rs.initiate()' either from a container that can access the mongo container using mongo:27017 (both container must be on the same network, like mongosetup and mongo containers are, in this – (/users/2605781/gandalf) (3,257 reputation) Gandalf  Commented (2022-06-25 14:44:12Z, License: CC BY-SA 4.0) Jun 25, 2022 at 14:44   (this comment was edited 2 times)        (number of 'useful comment' votes received) 1   @StijndeWitt setup, the string mongo in mongosetup container, maps to the IP of mongo container) or from the same container you can run mongo --eval 'rs.initiate()' since in this example the first approach is taken, and as explained the mongo --host mongo:27017 --eval 'rs.initiate()' must get executed at least once(preferably only once). hence restart: "no" is set, to let the container shut down after it has run the command successfully. – (/users/2605781/gandalf) (3,257 reputation) Gandalf  Commented (2022-06-25 14:44:29Z, License: CC BY-SA 4.0) Jun 25, 2022 at 14:44   (this comment was edited 1 time)        (number of 'useful comment' votes received) 1   @StijndeWitt 3. "I see sleep 10? Is that to give mongo time to initialize?" yes, it waits for 10 seconds before running the command, because the mongo daemon in the mongo container, must be up and running in order for the command  to run successfully – (/users/2605781/gandalf) (3,257 reputation) Gandalf  Commented (2022-06-25 14:44:38Z, License: CC BY-SA 4.0) Jun 25, 2022 at 14:44   (this comment was edited 2 times)          (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)             This answer is useful  (70:3:31e,16:d3b1c3385378d43d,10:1740393669,16:80b5b74c0d4f6262,8:47629959,ea462b30067c4a8f4073db44cb697b9b4ac5872f8851f1113f7df998197719e7) 75  (This answer is not useful)    (70:3:31e,16:7d0f0df76043b162,10:1740393669,16:5a69c673a060dfce,8:47629959,42f9aa07d59ab1f19779cb9836d14be42a241ace0bdc0d1dd7ae2982f4ec8ccc)      Save this answer.  (Loading when this answer was accepted…)     (/posts/47629959/timeline)    Show activity on this post.    The trick is to overwrite the compose COMMAND to perform whatever init action you need before calling the original command. Add a script in your image that will perform the init work that you want like set password, change internal config files, etc. Let's call it init.sh . You add it to your image.  Dockerfile: FROM: sourceimage:tag COPY init.sh /usr/local/bin/ ENTRYPOINT []   The above overrides whatever ENTRYPOINT is defined in the sourceimage . That's to make this example simpler. Make sure you understand what the ENTRYPOINT is doing in the Dockerfile from the sourceimage and call it in the command: of the docker-compose.yml file. docker-compose.yml: services: myservice: image: something:tag ... command: sh -c "/usr/local/bin/init.sh && exec myexecutable"   It's important to use exec before calling the main command. That will install the command as the first process (PID1) which will make it receive signals like STOP, KILL (Ctrl-C on keyboard) or HUP.   (/a/47629959) (Short permalink to this answer) Share  Share a link to this answer     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/47629959/edit) () Improve this answer  Follow (70:3:31e,16:23264072813ad50c,10:1740393669,16:37df73a51dbe1b81,8:47629959,94a4431b69e99b9699f05cb397e166f66b1fdd63482709e302ce437c0d81edb0)  Follow this answer to receive notifications       (/posts/47629959/revisions) (show all edits to this post) edited (2020-05-05 02:39:27Z) May 5, 2020 at 2:39    (/users/1042380/yu%d1%8fi) (yuяi's user avatar)    (/users/1042380/yu%d1%8fi) yuяi (reputation score) 2,725 (1 gold badge)  1  1 gold badge (26 silver badges)  26  26 silver badges (46 bronze badges)  46  46 bronze badges     answered (2017-12-04 09:17:59Z) Dec 4, 2017 at 9:17   (/users/1556338/bernard) (Bernard's user avatar)    (/users/1556338/bernard) Bernard Bernard (reputation score 17,281) 17.3k (13 gold badges)  13  13 gold badges (67 silver badges)  67  67 silver badges (69 bronze badges)  69  69 bronze badges        10 (number of 'useful comment' votes received) 5   executing this causes /usr/local/bin/docker-entrypoint.sh: line 172: /usr/local/bin/init.sh: No such file or directory  – (/users/4520965/james-jordan-taylor) (1,718 reputation) James Jordan Taylor  Commented (2018-08-14 00:28:09Z, License: CC BY-SA 4.0) Aug 14, 2018 at 0:28   (this comment was edited 1 time)        (number of 'useful comment' votes received) 3   Additionally, removing the first part of the command causes the error exec: not found  – (/users/4520965/james-jordan-taylor) (1,718 reputation) James Jordan Taylor  Commented (2018-08-14 00:31:05Z, License: CC BY-SA 4.0) Aug 14, 2018 at 0:31      (number of 'useful comment' votes received) 3   @BurhanAli  I've updated the answer to explicitly call the "shell -c". Also, there are many different combinations of ENTRYPOINT /CMD (Dockerfile) and entrypoint: /command: (docker compose) which can override each other. To keep this answer concise, I reset the ENTRYPOINT so that it doesn't override command . – (/users/1556338/bernard) (17,281 reputation) Bernard  Commented (2020-02-20 23:31:06Z, License: CC BY-SA 4.0) Feb 20, 2020 at 23:31      (number of 'useful comment' votes received) 1   @MurtazaHaji. In your case the line would be command: sh -c "/usr/local/bin/init.sh && exec redid-server --deamonize yes  – (/users/1556338/bernard) (17,281 reputation) Bernard  Commented (2021-06-07 11:25:04Z, License: CC BY-SA 4.0) Jun 7, 2021 at 11:25   (this comment was edited 1 time)        (number of 'useful comment' votes received) 3   @aderchox That's correct, command will override the CMD instruction in the image. However, the final startup action is obtained by combining ENTRYPOINT and CMD . So if ENTRYPOINT is for instance ["echo"] , you can set CMD to "hello" and this will print "hello". I believe this was done historically to allow different arguments to be specified easily. ENTRYPOINT contains the main executable and CMD contains the arguments passed to the executable.  You can also set ENTRYPOINT to an empty array so that CMD or command contains the full startup action line, like we do above. – (/users/1556338/bernard) (17,281 reputation) Bernard  Commented (2021-10-31 11:10:25Z, License: CC BY-SA 4.0) Oct 31, 2021 at 11:10        (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.)  |  (Expand to show all comments on this post) Show 5 more comments         This answer is useful  (70:3:31e,16:2fd1faacfab4451f,10:1740393669,16:9ff47c869759ce7f,8:66994812,e2ae74f40d32dc5a3a15ba5a057cee7c63561871d17d3310d4467e9079623f4c) 31  (This answer is not useful)    (70:3:31e,16:94a29a7f07fae455,10:1740393669,16:a27481842e82b9e8,8:66994812,eea432f4528c8aa0924be065e2fdfdff83113c49bcde882c7634a27591fb6d21)      Save this answer.  (Loading when this answer was accepted…)     (/posts/66994812/timeline)    Show activity on this post.    You can also use volumes to do this: services: example: image: <whatever> volume: ./init.sh:/init.sh entrypoint: sh -c "/init.sh"   Note that this will mount init.sh to the container, not copy it (if that matters, usually it doesn't). Basically processes within the container can modify init.sh and it would modify the file as it exists in your actual computer.   (/a/66994812) (Short permalink to this answer) Share  Share a link to this answer     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/66994812/edit) () Improve this answer  Follow (70:3:31e,16:da70a8bc05bbd23c,10:1740393669,16:bb18cbe700417fd4,8:66994812,f4dff0efaee9df134106c354c460446d003420181f9d2cee8e9816ab483ac13a)  Follow this answer to receive notifications       (/posts/66994812/revisions) (show all edits to this post) edited (2021-04-08 19:11:20Z) Apr 8, 2021 at 19:11         answered (2021-04-07 22:13:49Z) Apr 7, 2021 at 22:13   (/users/4021308/asad-ullah-khan) (Asad-ullah Khan's user avatar)    (/users/4021308/asad-ullah-khan) Asad-ullah Khan Asad-ullah Khan (reputation score) 1,853 (21 silver badges)  21  21 silver badges (25 bronze badges)  25  25 bronze badges        5 (number of 'useful comment' votes received) 2   Got it! I needed entrypoint: sh -c "sh init.sh" for it to work properly – (/users/2805387/fullstackchris) (1,502 reputation) fullStackChris  Commented (2022-05-25 19:30:15Z, License: CC BY-SA 4.0) May 25, 2022 at 19:30      (number of 'useful comment' votes received) 2   interesting, looks like you mounted it to ./init.sh instead of /init.sh ? seeing sh twice feels icky 😅 – (/users/4021308/asad-ullah-khan) (1,853 reputation) Asad-ullah Khan  Commented (2022-05-25 23:50:01Z, License: CC BY-SA 4.0) May 25, 2022 at 23:50      (number of 'useful comment' votes received) 1   using entrypoint: sh -c "sh /init.sh" resolve the issue sh: /init.sh: Permission denied  – (/users/3129401/mag) (171 reputation) mag  Commented (2023-05-16 13:06:23Z, License: CC BY-SA 4.0) May 16, 2023 at 13:06        how to solve "Permission denied" problem? – (/users/7952365/rgaponov) (143 reputation) rgaponov  Commented (2023-07-26 19:20:30Z, License: CC BY-SA 4.0) Jul 26, 2023 at 19:20        you will need to be more specific, but my guess is that the docker process does not have access to init.sh on your local computer, so you get this error. either copy the init.sh as suggested by (https://stackoverflow.com/a/47629959/4021308) stackoverflow.com/a/47629959/4021308 or move init.sh to somewhere docker would be allowed to access. i would NOT recommend running docker in --privileged mode ((https://stackoverflow.com/a/35620590/4021308) stackoverflow.com/a/35620590/4021308 ) – (/users/4021308/asad-ullah-khan) (1,853 reputation) Asad-ullah Khan  Commented (2023-07-26 19:46:48Z, License: CC BY-SA 4.0) Jul 26, 2023 at 19:46        (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)             This answer is useful  (70:3:31e,16:3ad1cddc910e43ae,10:1740393669,16:099c5db4efcc7a15,8:79258316,a976678b5086fbeae78408cd3e54a7f2b5f09f05a5b6b73e5d4db53694519337) 10  (This answer is not useful)    (70:3:31e,16:4c3b0e37a6f6508e,10:1740393669,16:ae3b306b44fa64ac,8:79258316,7db0d71da2881e1b7a851e9835d7dfe0b9cb7d6e75a2506c104e6d2880931664)      Save this answer.  (Loading when this answer was accepted…)     (/posts/79258316/timeline)    Show activity on this post.    Since Compose 2.30 you may use the (https://docs.docker.com/compose/how-tos/lifecycle/#post-start-hooks) post_start lifecycle hook . For your specific usecase, the docker-compose.yml could look like this: version: '3.8' services: my_service: image: my_image volumes: - /run/secrets:/run/secrets # Mount Rancher secrets post_start: - command: |
          PASSWORD=$(cat /run/secrets/my_secret_file) &&
          sed -i "s/placeholder_password/$PASSWORD/" /path/to/config.file      (/a/79258316) (Short permalink to this answer) Share  Share a link to this answer     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/79258316/edit) () Improve this answer  Follow (70:3:31e,16:9bd28ea507bbabdb,10:1740393669,16:50994d7a0e43e1f7,8:79258316,1e3127b8434169fd9b1d5bce93109f6e4bf6b40aa972f47995701589bd854800)  Follow this answer to receive notifications       answered (2024-12-06 14:23:42Z) Dec 6, 2024 at 14:23   (/users/1901362/lutangar) (lutangar's user avatar)    (/users/1901362/lutangar) lutangar lutangar (reputation score) 123 (1 silver badge)  1  1 silver badge (5 bronze badges)  5  5 bronze badges        1   Note that "The hook execution timing is not assured during the execution of the container's entrypoint." from (https://docs.docker.com/compose/how-tos/lifecycle/#post-start-hooks) docs.docker.com/compose/how-tos/lifecycle/#post-start-hooks  – (/users/12576620/n0099) (1,393 reputation) n0099  Commented (2025-01-06 11:47:19Z, License: CC BY-SA 4.0) Jan 6 at 11:47   (this comment was edited 2 times)          (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)          This answer is useful  (70:3:31e,16:b794df5ef85e69f8,10:1740393669,16:42df7deafb000ef0,8:47615848,4741b9a5262602addee36b74a723145e5b6341baa942eabacdf3ee2a7c41ccd1) 2  (This answer is not useful)    (70:3:31e,16:f73a36c7581a114e,10:1740393669,16:710db3df75460d1b,8:47615848,64f4dbd226cafbc23c2d8351524f6fd8813ffae80bc67e86866a92401dd9391d)      Save this answer.  (Loading when this answer was accepted…)     (/posts/47615848/timeline)    Show activity on this post.    docker-compose specify how to launch containers, not how to modify an existing running container. The (http://rancher.com/docs/rancher/latest/en/cattle/secrets/#adding-secrets-using-rancher-cli) Rancher documentation mentions that, for default usage of secrets, you can reference the secret by name in the secrets array in the docker-compose.yml .  The target filename will be the same name as the name of the secret.By default, the target filename will be created as User ID and Group ID 0, and File Mode of 0444.Setting external to true in the secrets part will make sure it knows the secret has already been created. Example of a basic docker-compose.yml :  version: '2' services: web: image: sdelements/lets-chat stdin_open: true secrets: - name-of-secret labels: io.rancher.container.pull_image: always secrets: name-of-secret: external: true   As illustrated in "(https://staxmanade.com/2016/09/how-to-update-a-single-running-docker-compose-container/) How to Update a Single Running docker-compose Container ", updating a container would involve a "build, kill, and up" sequence. docker-compose up -d --no-deps --build <service_name>     (/a/47615848) (Short permalink to this answer) Share  Share a link to this answer     Copy link (https://creativecommons.org/licenses/by-sa/3.0/) (The current license for this post: CC BY-SA 3.0) CC BY-SA 3.0     (/posts/47615848/edit) () Improve this answer  Follow (70:3:31e,16:eb96911d01d6ca1a,10:1740393669,16:6b988ee2e260b162,8:47615848,9c5080f6a9b083d9b3ef63ef1cb3438bc55ba75399b136ce5245a12e4ee77ae2)  Follow this answer to receive notifications       answered (2017-12-03 06:19:24Z) Dec 3, 2017 at 6:19   (/users/6309/vonc) (VonC's user avatar)    (/users/6309/vonc) VonC VonC (reputation score 1,326,862) 1.3m (563 gold badges)  563  563 gold badges (4.7k silver badges)  4.7k  4.7k silver badges (5.6k bronze badges)  5.6k  5.6k bronze badges        0   (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) Add a comment |  (Expand to show all comments on this post)          This answer is useful  (70:3:31e,16:a47e3f51e2ab9d65,10:1740393669,16:364e737aecd9655f,8:79333020,43844531b5c5b63cdf0e8486ce0b69abb2643c0a01f283e561ab760aa2d468b7) 0  (This answer is not useful)    (70:3:31e,16:6d39c1556e8c0e41,10:1740393669,16:8e9123f7a3cb84ec,8:79333020,ca1d4e89dcd4e55258e1f6b23570fc4ba51ab982240850e4b28458ff4af4aca1)      Save this answer.  (Loading when this answer was accepted…)     (/posts/79333020/timeline)    Show activity on this post.    (https://superuser.com/questions/1054678/can-we-execute-a-script-as-root-during-docker-container-startup/1869399#1869399) Can we execute a script as root during docker container startup?  COPY <<'DASH' /etc/rc.local
    set -x
    printenv
DASH

ENTRYPOINT ["dash", "-xc", ". /etc/rc.local && exec <the original entrypoint> \"$@\"", "$@"]
CMD [<the original cmd in exec form>]   Explain: The file /etc/rc.local is a (https://unix.stackexchange.com/questions/49626/purpose-and-typical-usage-of-etc-rc-local) historical filename for putting scripts that will be executed by (https://unix.stackexchange.com/questions/5877/what-are-the-pros-cons-of-upstart-and-systemd) pre-systemd-era -daemon (https://en.wikipedia.org/wiki/sysvinit) SysV init during the system boot. Another similar path for this purpose is (https://unix.stackexchange.com/questions/3537/etc-rc-d-vs-etc-init-d) /etc/init.d/*  . Here we just take this filename for convention as in docker container there's no init/systemd daemon by default and the ENTRYPOINT is the (https://news.ycombinator.com/item?id=8916785) pid 1  .  The original value of image ENTRYPOINT can be found in its (https://docs.docker.com/reference/dockerfile/#ENTRYPOINT) Dockerfile or get overrided by (https://docs.docker.com/reference/compose-file/services/#entrypoint) compose.yaml  .  And setting a new ENTRYPOINT will reset the original CMD (https://docs.docker.com/reference/dockerfile/#understand-how-cmd-and-entrypoint-interact) to empty string : If CMD is defined from the base image, setting ENTRYPOINT will reset CMD to an empty value. In this scenario, CMD must be defined in the current image to have a value.  so we have to copy the value of CMD from the (https://docs.docker.com/reference/dockerfile/#CMD) Dockerfile of original image or (https://docs.docker.com/reference/compose-file/services/#command) compose.yaml  if get overrided in it.  sh -xc 'echo "$@"' 1 2 3 is a way to (https://unix.stackexchange.com/questions/144514/add-arguments-to-bash-c/144519#144519) pass shell arguments into sh -c  , and this example shall run echo 1 2 3 that can be verified by (https://gist.github.com/mohanpedala/1e2ff5661761d3abd0385e8223e16425) set -x  .  dash is yet another (https://askubuntu.com/questions/976485/what-is-the-point-of-sh-being-linked-to-dash/976504#976504) implement of sh ell that's (https://unix.stackexchange.com/questions/148035/is-dash-or-some-other-shell-faster-than-bash) faster than bash and being used as the (https://wiki.ubuntu.com/DashAsBinSh) default /bin/sh in Debian. If you use some (https://mywiki.wooledge.org/Bashism) bashism (https://askubuntu.com/questions/1277922/what-are-syntax-differences-between-bash-and-dash) features that in /etc/rc.local , feel free to replace it with bash or other shell implements.  $@ is the value of all shell arguments except the first one like $argv[0] or (https://unix.stackexchange.com/questions/412707/why-0-is-not-a-positional-parameter) $0  which is the value being passed to (https://news.ycombinator.com/item?id=41434315) execv . In the shell env of ENTRYPOINT when a container is created, its $@ will be the value of (https://docs.docker.com/reference/dockerfile/#understand-how-cmd-and-entrypoint-interact) Dockerfile CMD  , so we could pass the value CMD from outer shell into the inner that created by sh -c 'echo "$@"' $@ .  The value of ENTRYPOINT and CMD in (https://docs.docker.com/reference/dockerfile/#shell-and-exec-form) Dockerfile or (https://docs.docker.com/reference/compose-file/services/#entrypoint) compose.yaml  must be written in exec form for removing the (https://stackoverflow.com/questions/47904974/what-are-shell-form-and-exec-form) extra ["sh", "-c"]  being prepend to the value when using shell form. Using docker image inspect <compose project name>-<compose service name> \
| jq '.[0].Config | with_entries(select([.key] | inside(["Cmd", "Entrypoint"])))'   to view the value of ENTRYPOINT or CMD of a built image for compose service that can be found in (https://docs.docker.com/reference/cli/docker/image/ls/) docker images -a  . Whereas the <compose project name> should be the value of (https://docs.docker.com/compose/how-tos/environment-variables/envvars/#compose_project_name) $COMPOSE_PROJECT_NAME  that defaults the (https://en.wikipedia.org/wiki/Dirname) dirname(1)  of the path of compose.yaml . The (https://en.wikipedia.org/wiki/Jq_(programming_language)) jq  expression just like (https://stackoverflow.com/questions/29518137/jq-selecting-a-subset-of-keys-from-an-object/46293052#46293052) _.pick()  in (https://lodash.com/docs/4.17.15#pick) lodash .   Double-quoting $@ as "$@" will prevent shell (https://mywiki.wooledge.org/WordSplitting) IFS=   (https://www.shellcheck.net/wiki/SC2086) word splitting for passing the original Dockerfile CMD as is into $1 of sh -c . This can be verified by (https://stackoverflow.com/questions/12314451/accessing-bash-command-line-args-vs/12316565#12316565) for word in "$@"; do echo "$word"; done  in /etc/rc.local "$@" and can fix some issues like (https://stackoverflow.com/questions/64392543/nginx-invalid-option-off-and-entrypoint-sh-permission-denied/78606672#78606672) nginx: invalid option: "off"  with the offical docker image (https://github.com/nginxinc/docker-nginx/blob/f227279d7b5c8ae8f99d29ed61f0da4c9ac0a404/entrypoint/docker-entrypoint.sh#L47) nginx  .  Prepend (https://en.wikipedia.org/wiki/Exec_(system_call)) exec(1p)  before "$@" will replace the ENTRYPOINT process dash with the first one in $@ array. This is a (https://unix.stackexchange.com/questions/466999/what-does-exec-do) common pattern with (https://stackoverflow.com/questions/32255814/what-purpose-does-using-exec-in-docker-entrypoint-scripts-serve/) docker entrypoint to allow passing (https://en.wikipedia.org/wiki/Signal_(IPC)) UNIX signal  to the proper process as only the topmost init process, that either to be the ENTRYPOINT or be replaced by exec in ENTRYPOINT , can recive UNIX signal from docker daemon. Or you will have to write a signal processor with trap in the (https://stackoverflow.com/questions/68523106/docker-bash-shell-script-does-not-catch-sigint-or-sigterm) entrypoint shell or with (https://en.wikipedia.org/wiki/C_signal_handling) signal()  in the entrypoint process. Most ENTRYPOINT shell in well-formed Dockerfile has already an exec "$@" in the end so the pid 1 will be replaced by twice, and this exec can still act as a safety net.  The dot . before /etc/rc.local is the what (https://stackoverflow.com/questions/20094271/using-dot-or-source-while-calling-another-script-what-is-the-difference) source  alias to in bashism. Comparing to (https://superuser.com/questions/176783/what-is-the-difference-between-executing-a-bash-script-vs-sourcing-it) execute the /etc/rc.local directly without prepending . , sourcing it won't require (https://unix.stackexchange.com/questions/291404/why-does-bashs-source-not-need-the-execution-bit) chmod +x  and can pass (https://stackoverflow.com/questions/16618071/can-i-export-a-variable-to-the-environment-from-a-bash-script-without-sourcing-i) export ed enviornment variables into the dash as entrypoint.   Taking the offical docker image (https://hub.docker.com/_/php) php  as a example:
We can find its original (https://github.com/docker-library/php/blob/75a0c3c716c3d4f64800ccf098142ecd751197f8/8.3/bookworm/fpm/Dockerfile#L223) ENTRYPOINT  is (https://github.com/docker-library/php/blob/75a0c3c716c3d4f64800ccf098142ecd751197f8/8.3/bookworm/fpm/docker-php-entrypoint) docker-php-entrypoint  and original (https://github.com/docker-library/php/blob/75a0c3c716c3d4f64800ccf098142ecd751197f8/8.3/bookworm/fpm/Dockerfile#L275) CMD  is php-fpm , so we should fill them with: ENTRYPOINT ["dash", "-xc", ". /etc/rc.local && exec docker-php-entrypoint \"$@\"", "$@"]
CMD ["php-fpm"]   If the order of executing script before or after the entrypoint get started is not important for you, also try the much simpler (https://stackoverflow.com/questions/47615751/docker-compose-run-a-script-after-container-has-started/79258316#79258316) post-start lifecycle hook in Docker Compose.   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