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Merge pull request #12548 from camallen/docker_host_docs
add note in docs about DOCKER_HOST env var overriding unix socket config
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@ -175,6 +175,12 @@ To create the `docker` group and add your user:
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$ docker run hello-world
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If this fails with a message similar to this:
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Cannot connect to the Docker daemon. Is 'docker -d' running on this host?
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Check that the `DOCKER_HOST` environment variable is not set for your shell.
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If it is, unset it.
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### Adjust memory and swap accounting
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