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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/47671589/how-can-i-run-script-automatically-after-docker-container-startup) How can I run script automatically after Docker container startup  (/questions/ask) Ask Question     (2017-12-06 10:05:44Z) Asked 7 years, 2 months ago  Modified (?lastactivity) (2024-02-15 19:31:51Z) 1 year ago  (Viewed 162,023 times) Viewed 162k times         This question shows research effort; it is useful and clear  (70:3:31e,16:d492858ea152e3a3,10:1740472894,16:ca302d838145cf61,8:47671589,91f8bcbff3f3c7027244943a7f777a278736f8679ec7bd96370f7d92d158eebe) 32  (This question does not show any research effort; it is unclear or not useful)    (70:3:31e,16:0493b08d56319fb1,10:1740472894,16:0c35190c23841509,8:47671589,edc3f0d66bec4ef9ace43739191bed157c96d57c8400c8cecf3a9c49daf09396)      Save this question.  (/posts/47671589/timeline)    Show activity on this post.    I'm using Search Guard plugin to secure an elasticsearch cluster composed of multiple nodes.
Here is my Dockerfile: #!/bin/sh FROM docker.elastic.co/elasticsearch/elasticsearch:5.6.3 USER root # Install search guard RUN bin/elasticsearch-plugin install --batch com.floragunn:search-guard-5:5.6.3-16 \ && chmod +x \ plugins/search-guard-5/tools/hash.sh \ plugins/search-guard-5/tools/sgadmin.sh \ bin/init_sg.sh \ && chown -R elasticsearch:elasticsearch /usr/share/elasticsearch USER elasticsearch   To initialize SearchGuard (create internal users and assign roles). I need to run the script init_sg.sh after the container startup. 
Here is the problem: Unless elasticsearch is running, the script will not initialize any security index.  The script's content is : sleep 10 plugins/search-guard-5/tools/sgadmin.sh -cd config/ -ts config/truststore.jks -ks config/kirk-keystore.jks -nhnv -icl   Now, I just run the script manually after the container startup but since I'm running it on Kubernetes.. Pods may get killed or fail and get recreated automatically for some reason. In this case, the plugin have to be initialized automatically after the container startup!  So how to accomplish this? Any help or hint would be really appreciated.  (/questions/tagged/docker) (show questions tagged 'docker') docker  (/questions/tagged/elasticsearch) (show questions tagged 'elasticsearch') elasticsearch  (/questions/tagged/kubernetes) (show questions tagged 'kubernetes') kubernetes  (/questions/tagged/dockerfile) (show questions tagged 'dockerfile') dockerfile  (/questions/tagged/elasticsearch-plugin) (show questions tagged 'elasticsearch-plugin') elasticsearch-plugin      (/q/47671589) (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/47671589/edit) () Improve this question  Follow (70:3:31e,16:b4c75f1089f4946a,10:1740472894,16:c670d8fa4ad95314,8:47671589,b8d8b8f3ca49feaf066c8b318c1d59bb82d4b36e09eeeda4116201d5abbfdf8c)  Follow this question to receive notifications       asked (2017-12-06 10:05:44Z) Dec 6, 2017 at 10:05   (/users/3980759/philojunkie) (PhiloJunkie's user avatar)    (/users/3980759/philojunkie) PhiloJunkie PhiloJunkie (reputation score) 1,169 (4 gold badges)  4  4 gold badges (13 silver badges)  13  13 silver badges (27 bronze badges)  27  27 bronze badges        3 (number of 'useful comment' votes received) 1   You will only need to initialize SG once per cluster.  Re-initialize SG on every restart of a pod will overwrite any custom roles/permissions not saved. – (/users/1272760/nafooesi) (1,267 reputation) nafooesi  Commented (2019-09-11 22:51:54Z, License: CC BY-SA 4.0) Sep 11, 2019 at 22:51        @nafooesi Absolutely, you are right! The SG should be initialized only once per cluster. – (/users/3980759/philojunkie) (1,169 reputation) PhiloJunkie  Commented (2019-09-15 18:17:52Z, License: CC BY-SA 4.0) Sep 15, 2019 at 18:17        This question is also addressed (https://stackoverflow.com/questions/45371521/adding-startup-script-to-dockerfile/64935472#64935472) here  – (/users/14336373/manishm) (137 reputation) ManishM  Commented (2020-11-20 19:17:11Z, License: CC BY-SA 4.0) Nov 20, 2020 at 19:17        (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)          8 Answers 8   Sorted by:  (/questions/47671589/how-can-i-run-script-automatically-after-docker-container-startup?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,16:0c85ae597ad4877a,10:1740472894,16:786ab10341e816a4,8:47671839,f160d6b209658a5bc1e97e53c6c7bd9cda8db9036a0a366873a1e274e7218a70) 30  (This answer is not useful)    (70:3:31e,16:93b67729ae73bf8d,10:1740472894,16:acbdae75404bd4c6,8:47671839,8d2eb9960be68a9c8ea711e4d299f085a4501852c73651a6fe3202dcc6da8728)      Save this answer.  (Loading when this answer was accepted…)     (/posts/47671839/timeline)    Show activity on this post.    The image itself has an entrypoint ENTRYPOINT ["/run/entrypoint.sh"] specified in the Dockerfile. You can replace it by your own script. So for example create a new script, mount it and first call /run/entrypoint.sh and then wait for start of elasticsearch before running your init_sg.sh .   (/a/47671839) (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/47671839/edit) () Improve this answer  Follow (70:3:31e,16:13337e8b4f1b20b9,10:1740472894,16:9906254098b9638f,8:47671839,faf6866a9cc2f5f2e6030e65c95ab1a0665203c0b39233ec78de63ec2481330c)  Follow this answer to receive notifications       (/posts/47671839/revisions) (show all edits to this post) edited (2018-09-04 17:34:02Z) Sep 4, 2018 at 17:34    (/users/3183756/caub) (caub's user avatar)    (/users/3183756/caub) caub (reputation score) 2,769 (2 gold badges)  2  2 gold badges (30 silver badges)  30  30 silver badges (32 bronze badges)  32  32 bronze badges     answered (2017-12-06 10:18:25Z) Dec 6, 2017 at 10:18   (/users/5979559/jonathan-lechner) (Jonathan Lechner's user avatar)    (/users/5979559/jonathan-lechner) Jonathan Lechner Jonathan Lechner (reputation score) 581 (4 silver badges)  4  4 silver badges (9 bronze badges)  9  9 bronze badges        4 (number of 'useful comment' votes received) 3   I'm trying to do the exact same thing, but the /run/entrypoint.sh is not present in the container. I can't find where it sits. Any help? – (/users/2598292/redgiant) (4,748 reputation) RedGiant  Commented (2018-05-25 12:37:48Z, License: CC BY-SA 4.0) May 25, 2018 at 12:37   (this comment was edited 1 time)          Found it at /entrypoint.sh for elasticsearch:1.5.2 – (/users/4478667/marieke) (263 reputation) Marieke  Commented (2021-06-24 16:50:54Z, License: CC BY-SA 4.0) Jun 24, 2021 at 16:50        Can you please specify how to mount it ? – (/users/913098/gulzar) (28,014 reputation) Gulzar  Commented (2021-11-27 19:41:44Z, License: CC BY-SA 4.0) Nov 27, 2021 at 19:41      (number of 'useful comment' votes received) 1   You can use (https://docs.docker.com/engine/reference/builder/#add) ADD in Dockerfile command to add script to the container statically.  If you change the script often and do not want to rebuild the image every time, you can make a script which is called from entrypoint.sh, and make all changes there. – (/users/3535036/do-do-new) (982 reputation) Do-do-new  Commented (2023-03-12 09:51:23Z, License: CC BY-SA 4.0) Mar 12, 2023 at 9:51        (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,16:186842fe506883d8,10:1740472894,16:04453f2d2a4a65ff,8:47671892,ee488a225c23e6cb588fe3e1c89c96e3874e336ade288bb2d4d9bf32c9bbf47b) 8  (This answer is not useful)    (70:3:31e,16:92187cf3b5a388a9,10:1740472894,16:4f7a52391a8615af,8:47671892,ed3f44353cacca4accd562fba51b79bdd183bac88377d9a71a688fcb1e3f8ecc)      Save this answer.  (Loading when this answer was accepted…)     (/posts/47671892/timeline)    Show activity on this post.    Not sure this will solves your problem, but its worth check my (https://github.com/veerendra2/searx-with-dnscrypt) repo 'sDockerfile  I have created a simple run.sh file copied to docker image and in the Dockerfile I wrote CMD ["run.sh"] . In the same way define whatever you want in run.sh and write CMD ["run.sh"] . You can find another example like below Dockerfile FROM java:8 RUN apt-get update && apt-get install stress-ng -y ADD target/restapp.jar /restapp.jar COPY dockerrun.sh /usr/local/bin/dockerrun.sh RUN chmod +x /usr/local/bin/dockerrun.sh CMD ["dockerrun.sh" ]   dockerrun.sh #!/bin/sh java -Dserver.port=8095 -jar /restapp.jar & hostname="hostname: `hostname`" nohup stress-ng --vm 4 & while true ; do sleep 1000 done     (/a/47671892) (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/47671892/edit) () Improve this answer  Follow (70:3:31e,16:e68cbc366269f7eb,10:1740472894,16:f40483010d3c2b1a,8:47671892,c36fa42d493147689385cbed85c0768f9d2688bd736fb03d59f2e0b21df9804a)  Follow this answer to receive notifications       (/posts/47671892/revisions) (show all edits to this post) edited (2017-12-06 10:25:36Z) Dec 6, 2017 at 10:25         answered (2017-12-06 10:20:29Z) Dec 6, 2017 at 10:20   (/users/2200798/veerendra2) (veerendra2's user avatar)    (/users/2200798/veerendra2) veerendra2 veerendra2 (reputation score) 2,273 (7 gold badges)  7  7 gold badges (37 silver badges)  37  37 silver badges (65 bronze badges)  65  65 bronze badges        1 (number of 'useful comment' votes received) 2   thanks for the reply, the elasticsearch image has already an entrypoint.sh file, using CMD like this will override it and elasticsearch search won't start at all :/ – (/users/3980759/philojunkie) (1,169 reputation) PhiloJunkie  Commented (2017-12-06 15:09:00Z, License: CC BY-SA 3.0) Dec 6, 2017 at 15:09        (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,16:3f27c56512ce9fa1,10:1740472894,16:87074de1d7636792,8:64935619,893148590f4f6ba797ad61122c0f54744ccfaa538b871cd4b3daffa2bbaa64ce) 7  (This answer is not useful)    (70:3:31e,16:fcf24750fe792b09,10:1740472894,16:45bd96dd4de09af8,8:64935619,120b349b144a7293efd44c48393703c58d67c55764442b1ba04ad15c49cf18e2)      Save this answer.  (Loading when this answer was accepted…)     (/posts/64935619/timeline)    Show activity on this post.    This is addressed in the documentation here: (https://docs.docker.com/config/containers/multi-service_container/) https://docs.docker.com/config/containers/multi-service_container/  If one of your processes depends on the main process, then start your helper process FIRST with a script like wait-for-it, then start the main process SECOND and remove the fg %1 line. #!/bin/bash # turn on bash's job control set -m # Start the primary process and put it in the background ./my_main_process & # Start the helper process ./my_helper_process # the my_helper_process might need to know how to wait on the # primary process to start before it does its work and returns # now we bring the primary process back into the foreground # and leave it there fg %1     (/a/64935619) (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/64935619/edit) () Improve this answer  Follow (70:3:31e,16:26197b3621fbb255,10:1740472894,16:246ef1ecd7527d4c,8:64935619,7cd6b6dbd42f80ece3a742fab1ccc150c12c7bf1b7e02abef2fb5ad66ef8e93f)  Follow this answer to receive notifications       answered (2020-11-20 19:19:14Z) Nov 20, 2020 at 19:19   (/users/14336373/manishm) (ManishM's user avatar)    (/users/14336373/manishm) ManishM ManishM (reputation score) 137 (2 silver badges)  2  2 silver badges (3 bronze badges)  3  3 bronze badges        1   duplicated here (https://stackoverflow.com/questions/45371521/adding-startup-script-to-dockerfile/64935472#64935472) (adding startup script to dockerfile) stackoverflow.com/questions/45371521/…  – (/users/14336373/manishm) (137 reputation) ManishM  Commented (2020-11-20 19:19:49Z, License: CC BY-SA 4.0) Nov 20, 2020 at 19:19        (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,16:4b49b87b7df2f5d4,10:1740472894,16:e9bdf0674d7a2487,8:55719193,64d3105e8d557552ce896cd81f5fb8f23f479347f1a0a3e3b1cce071db1267d7) 5  (This answer is not useful)    (70:3:31e,16:45c13271ee6e3d97,10:1740472894,16:16df0e9f81024e11,8:55719193,2bd737db99db91d21598055732967c6e43033f120bde10f7decbd5884faaa993)      Save this answer.  (Loading when this answer was accepted…)     (/posts/55719193/timeline)    Show activity on this post.    I was trying to solve the exact problem.  Here's the approach that worked for me. Create a separate shell script that checks for ES status, and only start initialization of SG when ES is ready:  Shell Script #!/bin/sh echo ">>>>  Right before SG initialization <<<<" # use while loop to check if elasticsearch is running  while true do netstat -uplnt | grep :9300 | grep LISTEN > /dev/null verifier=$? if [ 0 = $verifier ] then echo "Running search guard plugin initialization" /elasticsearch/plugins/search-guard-6/tools/sgadmin.sh -h 0.0 .0 .0 -cd plugins/search-guard-6/sgconfig -icl -key config/client.key -cert config/client.pem -cacert config/root-ca.pem -nhnv break else echo "ES is not running yet" sleep 5 fi done   Install script in Dockerfile You will need to install the script in container so it's accessible after it starts. COPY sginit.sh / RUN chmod +x /sginit.sh   Update entrypoint script You will need to edit the entrypoint script or run script of your ES image. So that it starts the sginit.sh in the background BEFORE starting ES process. # Run sginit in background waiting for ES to start /sginit.sh &   This way the sginit.sh will start in the background, and will only initialize SG after ES is started. The reason to have this sginit.sh script starts before ES in the background is so that it's not blocking ES from starting.  The same logic applies if you put it after starting of ES, it will never run unless you put the starting of ES in the background.   (/a/55719193) (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/55719193/edit) () Improve this answer  Follow (70:3:31e,16:f0dee2d2e7cabe40,10:1740472894,16:e92397f245300181,8:55719193,a7c919bd1663673633debb9a02bb596357a41a20328f843b454e1b934fa07d31)  Follow this answer to receive notifications       (/posts/55719193/revisions) (show all edits to this post) edited (2020-06-20 09:12:55Z) Jun 20, 2020 at 9:12    (/users/-1/community) (Community's user avatar)    (/users/-1/community) Community (Community Bot — not a real person. Replies to this bot are not monitored.) Bot (reputation score) 1 (1 silver badge)  1  1 silver badge     answered (2019-04-17 02:50:43Z) Apr 17, 2019 at 2:50   (/users/1272760/nafooesi) (nafooesi's user avatar)    (/users/1272760/nafooesi) nafooesi nafooesi (reputation score) 1,267 (13 silver badges)  13  13 silver badges (18 bronze badges)  18  18 bronze badges        3   How to wait for the ES get started, then initialize the SG? – (/users/7794308/akira) (273 reputation) Akira  Commented (2019-09-10 21:20:09Z, License: CC BY-SA 4.0) Sep 10, 2019 at 21:20      (number of 'useful comment' votes received) 1   As commented below the original question, you do NOT want to initialize SG every single time.  It will overwrite any modified config when a pod restarts.  SG should only be initialized once per cluster at the beginning.  If you need to run some other script after ES starts, my script can be used as an example to detect if ES is running in the background before kicking off the script. – (/users/1272760/nafooesi) (1,267 reputation) nafooesi  Commented (2019-12-03 01:23:34Z, License: CC BY-SA 4.0) Dec 3, 2019 at 1:23        The general approach described here is very useful. I had a similar problem (not with ES), where I wanted to run a script after the main process had a chance to start up. This pattern worked like a charm! – (/users/2686286/bischoje) (197 reputation) bischoje  Commented (2020-02-25 20:07:15Z, License: CC BY-SA 4.0) Feb 25, 2020 at 20:07        (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,16:697aaf8d0593e7d1,10:1740472894,16:87158d6405c6b08e,8:64407602,446d96c14a6443f0977551ad43b0034b4d3a17fcaaceda01fed48c473cdd70b8) 3  (This answer is not useful)    (70:3:31e,16:668014197a4260b9,10:1740472894,16:c4a7a30c06481105,8:64407602,1d74097b5f3e07ca7ddff5520eb45c84d25f6aacacb5c7c1e3c7d9b8eb92eb6f)      Save this answer.  (Loading when this answer was accepted…)     (/posts/64407602/timeline)    Show activity on this post.    You can also use (https://github.com/vishnubob/wait-for-it) wait-for-it script. It will wait on the availability of a host and TCP port. It is useful for synchronizing the spin-up of interdependent services and works like a charm with containers. It does not have any external dependencies so you can just run it as an RUN command without doing anything else. A Dockerfile example based on this (https://stackoverflow.com/questions/35526532/how-to-add-an-elasticsearch-index-during-docker-build) thread : FROM elasticsearch # Make elasticsearch write data to a folder that is not declared as a volume in elasticsearchs' official dockerfile. RUN mkdir /data && chown -R elasticsearch:elasticsearch /data && echo 'es.path.data: /data' >> config/elasticsearch.yml && echo 'path.data: /data' >> config/elasticsearch.yml # Download wait-for-it ADD https://raw.githubusercontent.com/vishnubob/wait-for-it/e1f115e4ca285c3c24e847c4dd4be955e0ed51c2/wait-for-it.sh /utils/wait-for-it.sh # Copy the files you may need and your insert script # Insert data into elasticsearch RUN /docker-entrypoint.sh elasticsearch -p /tmp/epid & /bin/bash /utils/wait-for-it.sh -t 0 localhost:9200 -- path/to/insert/script.sh; kill $(cat /tmp/epid) && wait $(cat /tmp/epid); exit 0 ;     (/a/64407602) (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/64407602/edit) () Improve this answer  Follow (70:3:31e,16:b7dbd4908bb17d61,10:1740472894,16:fa7ab610d4a7ec1f,8:64407602,6cdf01a576b5b69fd569a4be7a2cb27fe96466b5942952ea4d5d13953d9350ed)  Follow this answer to receive notifications       answered (2020-10-17 21:37:18Z) Oct 17, 2020 at 21:37   (/users/14469823/encodedwitch) (encodedwitch's user avatar)    (/users/14469823/encodedwitch) encodedwitch encodedwitch (reputation score) 31 (1 bronze badge)  1  1 bronze badge        1   wait-for-it from master branch: (https://raw.githubusercontent.com/vishnubob/wait-for-it/master/wait-for-it.sh) raw.githubusercontent.com/vishnubob/wait-for-it/master/…  – (/users/1764521/damien-golding) (1,000 reputation) Damien Golding  Commented (2023-07-25 11:03:33Z, License: CC BY-SA 4.0) Jul 25, 2023 at 11:03        (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,16:2c6a25208b92a915,10:1740472894,16:fcf9603427b69d82,8:47672205,6625bcdaa3eceb078f491905f797e8e4faf0032eafb72fe318a94e2294d3e61d) 2  (This answer is not useful)    (70:3:31e,16:3aa5ee72f2fc8504,10:1740472894,16:cbb027637ba57042,8:47672205,ee13d7e0b4a25a635f74e2fb6c60838d2bced2bc4a20075938c30efb9877d93f)      Save this answer.  (Loading when this answer was accepted…)     (/posts/47672205/timeline)    Show activity on this post.    I would suggest to put the CMD in you docker file to execute the script when the container start FROM debian RUN apt-get update && apt-get install -y nano && apt-get clean EXPOSE 8484 CMD ["/bin/bash" , "/opt/your_app/init.sh" ]   There is other way , but before using this look at your requirement, ENTRYPOINT "put your code here" && /bin/bash #exemple ENTRYPOINT service nginx start && service ssh start &&/bin/bash "use && to separate your code"     (/a/47672205) (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/47672205/edit) () Improve this answer  Follow (70:3:31e,16:f7de6f87b5549dfa,10:1740472894,16:5f21cb7573a5c542,8:47672205,e18c348319153d9aec41db7f8fadeeda2c1357859914fa8358e6f14db20e7402)  Follow this answer to receive notifications       answered (2017-12-06 10:37:51Z) Dec 6, 2017 at 10:37   (/users/1109179/sohan) (Sohan's user avatar)    (/users/1109179/sohan) Sohan Sohan (reputation score) 6,809 (6 gold badges)  6  6 gold badges (40 silver badges)  40  40 silver badges (58 bronze badges)  58  58 bronze badges        2   this solution overrides the entrypoint which is provided by Elasticsearch Image – (/users/3980759/philojunkie) (1,169 reputation) PhiloJunkie  Commented (2017-12-06 15:06:11Z, License: CC BY-SA 3.0) Dec 6, 2017 at 15:06        I have no looked into elasticseacrh image installation as such, do you mean this does not work for you? – (/users/1109179/sohan) (6,809 reputation) Sohan  Commented (2017-12-07 06:05:10Z, License: CC BY-SA 3.0) Dec 7, 2017 at 6:05        (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:f362f44c2a68758e,10:1740472894,16:9ca0267b4a05ea86,8:75950598,53cc42b41c4793d8d5eb04f52948a5e8fb9d117b9789225d769b92bd5090ff03) 1  (This answer is not useful)    (70:3:31e,16:d1718d790da92f1e,10:1740472894,16:ec5829f935637071,8:75950598,3f93f177df5507160c3048f9a8be454ddd2fc85869bfa074ea326ca88d02d64d)      Save this answer.  (Loading when this answer was accepted…)     (/posts/75950598/timeline)    Show activity on this post.    There is a dedicated tool for this - (https://github.com/just-containers/s6-overlay) s6-overlay .To quote from their description: A simple init process which allows the end-user to execute tasks like initialization (...) Multiple processes in a single container (...) Able to operate in "The Docker Way"  The repo provides lengthy explanation how it works, how to install etc. which I won't repeat here. Example Imo their repo lacks a working, straightforward minimal example how to run a process + a script so I provide one. I modify the example they provide in their docs.Say we want to run nginx (or any process that runs until end of container lifetime) plus some shell script myscript.sh . Local directory structure: ./Dockerfile ./myscript.sh ./s6-overlay/s6-rc.d/myapp/type ./s6-overlay/s6-rc.d/myapp/up ./s6-overlay/s6-rc.d/user/contents.d/myapp   Dockerfile : FROM ubuntu ARG S6_OVERLAY_VERSION=3.1.4.1 RUN apt-get update && apt-get install -y nginx xz-utils RUN echo "daemon off;" >> /etc/nginx/nginx.conf # Minimal set of dependecies required for s6 ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-noarch.tar.xz /tmp RUN tar -C / -Jxpf /tmp/s6-overlay-noarch.tar.xz ADD https://github.com/just-containers/s6-overlay/releases/download/v${S6_OVERLAY_VERSION}/s6-overlay-x86_64.tar.xz /tmp RUN tar -C / -Jxpf /tmp/s6-overlay-x86_64.tar.xz # Overhead of files to manage processes via s6 COPY s6-overlay /etc/s6-overlay # Copy the script we intend to run COPY myscript.sh /home # CMD is the main process - nothing special here CMD ["/usr/sbin/nginx" ] # ENTRYPOINT must be /init for s6 to work ENTRYPOINT ["/init" ]   myscript.sh - make sure to make it executable: #!/bin/bash echo "foo" > /home/foo.txt echo "bar" > /home/bar.txt   s6-overlay/s6-rc.d/myapp/type : oneshot   "an up file contains a single command line" so as soon our script has >1 line, we have to outsource our script to a separate file. Therefore this is our s6-overlay/s6-rc.d/myapp/up : /home/myscript.sh   s6-overlay/s6-rc.d/myapp/contents.d/myapp is an empty file. Now we simply need to docker build (...) and docker run -p 80:80 (...) . If you have done everything correctly, you should see a log message s6-rc: info: service myapp successfully started at container startup.You can then visit localhost:80 and run docker exec CONTAINER bash -c "cat /home/foo.txt" to confirm it works as expected. Note that utilizing s6-rc.d is the recommended way to do it. There's also a legacy way to accomplish this with less overhead by putting myscript.sh into folder /etc/cont-init.d/ .   (/a/75950598) (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/75950598/edit) () Improve this answer  Follow (70:3:31e,16:cdffed00a8cbccb2,10:1740472894,16:75c4be84b284ae2a,8:75950598,feabc0e91189f353063656819c29a97110c4d33e162643621d8be3f645dcdc58)  Follow this answer to receive notifications       (/posts/75950598/revisions) (show all edits to this post) edited (2023-04-06 14:40:17Z) Apr 6, 2023 at 14:40         answered (2023-04-06 14:18:28Z) Apr 6, 2023 at 14:18   (/users/6312338/nichoio) (nichoio's user avatar)    (/users/6312338/nichoio) nichoio nichoio (reputation score) 7,667 (4 gold badges)  4  4 gold badges (31 silver badges)  31  31 silver badges (42 bronze badges)  42  42 bronze badges           (Use comments to ask for more information or suggest improvements. Avoid comments like “+1” or “thanks”.) 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My success would be adding  my script to CMD or ENTRYPOINT Then add the bootom of the script  i made run   include the start application at the bottom. apachectl -D FOREGROUND   (/a/78003499) (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/78003499/edit) () Improve this answer  Follow (70:3:31e,16:e5b8630d9e6de981,10:1740472894,16:225fd34ddc4f6cb7,8:78003499,e842f61a3e1189550b7b732ef96481931551ec8af5ad3737e8a1a47dfa5ed48e)  Follow this answer to receive notifications       answered (2024-02-15 19:31:51Z) Feb 15, 2024 at 19:31   (/users/4478532/cyford-technologies-llc) (Cyford Technologies LLC's user avatar)    (/users/4478532/cyford-technologies-llc) Cyford Technologies LLC Cyford Technologies LLC (reputation score) 31 (7 bronze badges)  7  7 bronze badges           (Use comments to ask for more information or suggest improvements. 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