Write files outside of a docker container via python

Question

Is there a way to write files (json in this case) to outside of the docker container? I'm taking about the most simple way, for example:

data = {"id":"1","name":"sample"}
with open('name.json','w') as fp:
   json.dump(data,fp,indent=4)

is there a way to make this write outside of the docker container? or in a specific place? or to save it on a specific path on the system that the container will run on?

Mount an outside path to an inside path when starting the container, then write to the inside path from inside the container. — deceze
– deceze ♦, Commented Feb 24, 2021 at 7:11
Im pretty new to containers.. not really sure what that means... could you elaborate a bit more or send some docs regarding this? thanks! — Slava Bugz
– Slava Bugz, Commented Feb 24, 2021 at 7:12
If the goal of your application is to read and write host files, and you're running on a MacOS or Linux system that has Python preinstalled anyways, I wouldn't bring Docker into it; just directly run the Python script. — David Maze
– David Maze, Commented Feb 24, 2021 at 11:57

snaeil · Accepted Answer · 2021-02-24 09:30:24Z

4

Let's assume

your python script has the location /app/myscript.py in your docker container.
the location for where your python script should write the files is /home/jon/result_files/
your docker image is called mypyimg

Then you can use volumes to mount a host location when starting your container:

docker run -d \
  --name my_py_container \
  -v /home/jon/result_files:/app \
  mypyimg

answered Feb 24, 2021 at 9:30

snaeil

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2 Comments

frank Over a year ago

that is good, but what if I am hosting the container in Azure. How can I control the volume to mount?

snaeil Over a year ago

Unfortunately I have no experience with Azure but you might want to consult their documentation. Maybe this helps: learn.microsoft.com/en-us/azure/container-instances/…

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