Docker for Python get DOCKER_HOST

Question

I'm trying to find the DOCKER_HOST for my docker registry.

Looking at the sdk, I know it's possible to set the DOCKER_HOST.

But is it possible to find the current DOCKER_HOST been used?

import docker
client = docker.from_env()
client.info()

I suppose the current one would be in os.environ['DOCKER_HOST']. — Marco Bonelli
– Marco Bonelli, Commented May 17, 2022 at 23:14
I did try this: docker_host = os.environ['DOCKER_HOST'] and I got KeyError: DOCKER_HOST — user3292394
– user3292394, Commented May 17, 2022 at 23:26

Dan Lowe · Accepted Answer · 2022-05-17 23:32:14Z

1

DOCKER_HOST is an optional value.

The default Docker host (and local registry) is a socket on localhost. I wouldn't expect that you'll find a DOCKER_HOST set unless you have chosen to set one.

Various things can override, however, so it really depends on your local environment and setup.

DOCKER_HOST value
DOCKER_CONTEXT value
A context set using the docker context command
A context set using the -c flag to the docker command

Reference (docs.docker.com)

answered May 17, 2022 at 23:32

Dan Lowe

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