Docker docs, answered: 6 of 15 questions

We took 15 questions people really ask about Docker and put them to the GetFoxChat AI Operator (that you name as you like), reading only the public Docker docs at docs.docker.com. An answer counts only when it links the exact docs page it came from. Everything else is listed as a gap.

Independent test from public docs — not affiliated with Docker.
6 of 15questions the docs answer
9gaps: not found in the docs pages we read
40docs pages read
27 September 2026last checked

What the Docker docs answer

Each answer below is the operator's reply, word for word, with the docs page it points to.

  1. From inside of a Docker container, how do I connect to the localhost of the machine?

    Asked as a Stack Overflow question

    From inside a Docker container, you may be able to connect to the host machine using a hostname such as:

    host.docker.internal

    So instead of using localhost or 127.0.0.1 in your connection string, you might try host.docker.internal. For example, if your host is running a database, you could attempt to connect to it via host.docker.internal from within the container.

    Docs page: https://docs.docker.com/get-started/docker-concepts/running-containers/publishing-ports/

  2. What is the difference between the 'COPY' and 'ADD' commands in a Dockerfile?

    Asked as a Stack Overflow question

    Great question. Both COPY and ADD can be used to get files into your image, but ADD has extra capabilities that make it more complex. COPY is the straightforward choice. It's predictable and simple. ADD does everything COPY does, but it also has two additional features. First, it may handle compressed files. Second, it may support fetching files from remote URLs. Because ADD has these extra behaviors, it can be less predictable.

    Docs page: https://docs.docker.com/build/concepts/dockerfile/

  3. What is the difference between CMD and ENTRYPOINT in a Dockerfile?

    Asked as a Stack Overflow question

    CMD and ENTRYPOINT are both used to specify what command runs when a container starts, but they work differently and are often used together. ENTRYPOINT defines the container's primary executable. You typically use ENTRYPOINT when you want the container to behave like a standalone application. CMD can provide a command or arguments for the container. If there's no ENTRYPOINT, CMD becomes the command that runs. Both instructions can be used together in a Dockerfile, and combining them is a common pattern. For example, you might use ENTRYPOINT to specify an application and CMD to provide some arguments alongside it.

    Docs page: https://docs.docker.com/get-started/docker-concepts/running-containers/overriding-container-defaults/

  4. How to start a stopped Docker container with a different command?

    Asked as a GitHub issue

    To start a stopped Docker container with a different command, you have a couple of options depending on what you need:

    Option 1: Start with a new command (if the container hasn't been started before)
    If the container is brand new and hasn't run yet, you can run it with your custom command specified at the end of your docker run invocation.

    Docs page: https://docs.docker.com/get-started/docker-concepts/running-containers/overriding-container-defaults/

  5. What is a build context?

    Asked as a Heading in the docs

    When you run a build, Docker executes the instructions in your Dockerfile.

    The size of your build context matters. That's why it's a good practice to be intentional about what you include in your context.

    Docs page: https://docs.docker.com/build/concepts/context/

  6. Is Docker Build Cloud a standalone product or a part of Docker Desktop?

    Asked as a Heading in the docs

    That said, Docker Build Cloud integrates with your existing Docker setup — whether that's Docker Desktop, Docker Engine on a server, or any other Docker environment.

    Docs page: https://docs.docker.com/guides/docker-build-cloud/

Not found in the docs pages we read

We read up to 40 pages of these docs. A question lands here when the operator could not answer it, with a link, from those pages. The answer may be on a page we did not read. If you maintain these docs, this is the list of things your readers ask and do not find.

The operator could not answer these from the Docker docs, so it said so instead of guessing. For a docs team, this list is the useful part: these are questions people ask that the docs leave open.

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