Run multiple commands while starting docker services

Question

I am trying to run two different commands when doing docker-compose up.

My command: parameter looks like:

gunicorn --reload analytics_api:api --workers=3 --timeout 10000 -b :8083 && exec python /analytics/model_download.py

But when I run this the container fails with the error:

gunicorn: error: unrecognized arguments: && exec python /analytics/model_download.py

The second part of the command python /analytics/model_download.py, is used to download some dependencies from a sharedpath to a directory inside the container.

I want to run it while the service is up, not during the build.

What is going wrong here?

Execute the `exec python /analytics/model_download.py` command first and then run the `gunicorn` command — techytushar, Dec 04 '19 at 10:29
Does this answer your question? [Why can't I use Docker CMD multiple times to run multiple services?](https://stackoverflow.com/questions/23692470/why-cant-i-use-docker-cmd-multiple-times-to-run-multiple-services) — julian, Dec 04 '19 at 11:23
Can you run the "download" step as a `RUN` step in your Dockerfile? That'd be cleaner and avoid this problem. — David Maze, Dec 04 '19 at 11:40
@DavidMaze That will make the image huge, and after each retraining, the build should be made, which is not advised — Tom J Muthirenthi, Dec 04 '19 at 11:42
@julian I want to run it in the docker-compose file while starting the container, not during the build. — Tom J Muthirenthi, Dec 04 '19 at 13:56
@techytushar when I do so, the container `exited with code 0` — Tom J Muthirenthi, Dec 04 '19 at 14:02
I think the entrypoint/ CMD in the Dockerfile can be overridden in the manifest. So same logic would apply there. — julian, Dec 04 '19 at 14:19

Wander3r · Answer 1 · 2019-12-04T14:04:24.157

0

One way can be to have a startup shell script as the command which has both these entries

startup.sh

#start this in background if the other process need not wait for completion
exec python /analytics/model_download.py &
gunicorn --reload analytics_api:api --workers=3 --timeout 10000 -b :8083

while true 
 do
   sleep 5
done

edited Dec 04 '19 at 14:04

answered Dec 04 '19 at 10:34

Wander3r

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When I give it inside the sh file the container exits with exit code 0. Looks like after running the commands the container closes itself. – Tom J Muthirenthi Dec 04 '19 at 13:55
Don't let the script file exit by keeping a while loop which sleeps.. – Wander3r Dec 04 '19 at 14:02
Can you detail it? – Tom J Muthirenthi Dec 04 '19 at 14:03

score 0 · Accepted Answer · answered Dec 04 '19 at 15:20

0

Adding bash -c before the command solved the problem.

The command value will look like:

bash -c "python model_download.py && gunicorn --reload analytics_api:api -- workers=3 --timeout 10000 -b :8083"

answered Dec 04 '19 at 15:20

Tom J Muthirenthi

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Run multiple commands while starting docker services

2 Answers2