CODEWITHSUNDEEP
docker
Kush Patel
Kush Patel

Reputation: 3865

How to run specific file first before anything else happens in docker run

I have following docker file.


MAINTANER Your Name "[email protected]"

RUN apt-get update -y && \
    apt-get install -y python-pip python-dev

# We copy just the requirements.txt first to leverage Docker cache
COPY ./requirements.txt /app/requirements.txt

WORKDIR /app

RUN pip install -r requirements.txt

COPY . /app

ENTRYPOINT [ "python" ]

CMD [ "app.py" ]

There is one file that I want to run even before app.py file runs. How can I achieve that? I don't want to put code inside app.py.

Upvotes: 3

Views: 450

Answers (2)

ooo
ooo

Reputation: 1627

One solution could be to use a docker-entrypoint.sh script. Basically that entrypoint would allow you to define a set of commands to run to initialize your program.

For example, I could create the following docker-entrypoint.sh:

#!/bin/bash
set -e
if [ "$1" = 'app' ]; then
   sh /run-my-other-file.sh
   exec python app.py
fi
exec "$@"

And I would use it as so in my Dockerfile:

FROM alpine
COPY ./docker-entrypoint.sh /
ENTRYPOINT ["/docker-entrypoint.sh"]
CMD ["app"]

There is a lot of articles and examples online about docker-entrypoints. You should give it a quick search I am sure you will find a lot of interesting examples that are used by famous production grade containers.

Upvotes: 2

Abdulla Thanseeh
Abdulla Thanseeh

Reputation: 10546

You could try creating a bash file called run.sh and put inside

app.py

try changing the CMD

CMD [ "run.sh" ]

Also make sure permission in executable for run.sh

Upvotes: 0

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