Running multiple commands after docker create

Question

I want to make a script run a series of commands in a Docker container and then copy a file out. If I use docker run to do this, I don't get back the container ID, which I would need for the docker cp. (I could try and hack it out of docker ps, but that seems risky.)

It seems that I should be able to

Create the container with docker create (which returns the container ID).
Run the commands.
Copy the file out.

But I don't know how to get step 2. to work. docker exec only works on running containers...

vivekyad4v · Accepted Answer · 2018-01-17 10:06:58Z

2

If i understood your question correctly, all you need is docker "run exec & cp" -

For example -

Create container with a name --name with docker run -

$ docker run --name bang -dit alpine
Run few commands using exec -

$ docker exec -it bang sh -c "ls -l"
Copy a file using docker cp -

$ docker cp bang:/etc/hosts ./
Stop the container using docker stop -

$ docker stop bang

answered Jan 17, 2018 at 10:06

vivekyad4v

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1 Comment

Mohan Over a year ago

It was the --name that I missed.

SuicideSheep · Accepted Answer · 2018-01-17 09:57:47Z

1

All you really need is Dockerfile and then build the image from it and run the container using the newly built image. For more information u can refer to this

A "standard" content of a dockerfile might be something like below:

#Download base image ubuntu 16.04
FROM ubuntu:16.04

# Update Ubuntu Software repository
RUN apt-get update

# Install nginx, php-fpm and supervisord from ubuntu repository
RUN apt-get install -y nginx php7.0-fpm supervisor && \
rm -rf /var/lib/apt/lists/*

#Define the ENV variable
ENV nginx_vhost /etc/nginx/sites-available/default
ENV php_conf /etc/php/7.0/fpm/php.ini
ENV nginx_conf /etc/nginx/nginx.conf
ENV supervisor_conf /etc/supervisor/supervisord.conf

#Copy supervisor configuration
COPY supervisord.conf ${supervisor_conf}


# Configure Services and Port
COPY start.sh /start.sh
CMD ["./start.sh"]

EXPOSE 80 443

answered Jan 17, 2018 at 9:57

SuicideSheep

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2 Comments

Mohan Over a year ago

I don't have any trouble building my image or running it. The problem is getting the container ID.

SuicideSheep Over a year ago

you can specify a name for the container before-hand docker run --name compassionate_darwin nginx and using the specified named on docker cp compassionate_darwin:/tmp/foo/myfile.txt instead of using the docker container id

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