Set environment var to docker container created in python

Question

I'm developing an application that creates a container and runs it, using a docker image.

I create the client using this snippet:
client = docker.DockerClient(base_url='unix://var/run/docker.sock', version='1.41', timeout=10)
and it's fine. I instantiate and run the image properly using this:
client.containers.run(image=deployment_json['container_image'], command="sbt run", environment=cfg) The environment parameter does not lead into error, and the container runs fine, but the image doesn't retrieve the environment variable (NullPointer, it's a Scala app) the cfg is created like this: cfg = ['var_name', str(env)] where env is a json object.

Using docker lib version 5.0.0.
What am I missing? How do i give environment variables to docker images?

it's a json... in the scala app, i retrieve this json as a string and then treat it... — Marco Frag Delle Monache
– Marco Frag Delle Monache, Commented May 11, 2021 at 7:47

dejanualex · Accepted Answer · 2021-05-11 07:56:38Z

1

From docker cli perspective you have --env , -e flag to set environment variables when running docker run

From docs I think this can be achieved using environment var:


exec_run(cmd, stdout=True, stderr=True, stdin=False, tty=False, privileged=False, user='', detach=False, stream=False, socket=False, environment=None, workdir=None, demux=False)

where you should pass as an argument the environment variable

environment (dict or list) – Environment variables to set inside the container, as a dictionary or a list of strings in the format ["SOMEVARIABLE=xxx"].

edited May 11, 2021 at 7:56

answered May 11, 2021 at 7:52

dejanualex

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6 Comments

Marco Frag Delle Monache Over a year ago

exactly what i did, if you would read. but thank you for the effort

Marco Frag Delle Monache Over a year ago

maybe i created the dict the wrong way, wait

dejanualex Over a year ago

Yes sorry I've missed it, I think cfg = ['var_name', str(env)] does not look ok it should be more like this ["SOMEVARIABLE=xxx"]

Marco Frag Delle Monache Over a year ago

exactly. my fault of course.. I'll mark your answer as useful, but not as solution if you'd like

dejanualex Over a year ago

Sure man, I just wanted to help I'm not a reputation hunter .

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