How can I "mount" a file into a directory in a docker container using docker-py?

Question

I need to get a single file from my host machine into a per-existing directory in a docker container using docker-py. The directory shall not be overridden means mount is no option. Moving the directory to allow a shared volume between the host and the container is no option as well.

Have you tried mounting file, not directory? When you mount with `--volume` full path including filename and extension, it shouldn't overwrite directory. — Alejandro Galera, May 16 '18 at 10:40
Seems like it works to mount a folder from the host into the container without overriding the parent directory with `client.containers.run(image='ubuntu', name='ubuntu', volumes={'/tmp/folder': {'bind': '/tmp/folder', 'mode': 'ro'}}, network='host', command='ls /tmp')`... — thinwybk, May 16 '18 at 12:00

score 1 · Accepted Answer · edited Oct 05 '21 at 23:35

A single file on the host /tmp/hostfile.txt can be mounted into a container /tmp/containerfile.txt e.g. via pseudo code:

import docker

client = docker.from_env()
stdout = client.containers.run(
    image='ubuntu',
    name='ubuntu',
    volumes={
        '/tmp/container.txt': {
            'bind': '/tmp/hostfile.txt',
            'mode': 'ro',
        }
    },
    network='host',
    command='ls /tmp',
)

(The string stdout contains the file.txt.)

How can I "mount" a file into a directory in a docker container using docker-py?

1 Answers1