moby/docs/sources/index/variable.rst

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Docker Index Environment Variable
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Variable
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.. code-block:: sh

    DOCKER_INDEX_URL

Setting this environment variable on the docker server will change the URL docker index.
This address is used in commands such as ``docker login``, ``docker push`` and ``docker pull``.
The docker daemon doesn't need to be restarted for this parameter to take effect.

Example
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.. code-block:: sh

    docker -d &
    export DOCKER_INDEX_URL="https://index.docker.io"