What ID will be output when running the command 'docker run alpine ID' in a local container account?

In the context of executing the command docker run alpine ID, ID is not an argument that will be interpreted as a user identifier inside the container by default.

The docker run command creates and starts a new container from the alpine image. In this case, ID acts as an argument that will be passed as a command or argument to the entrypoint or main command (cmd) defined in the alpine image.

The alpine image does not execute the ID command by default when run without explicit instructions. Typically, alpine is used to run a specific command or service.

If the alpine image does not define a specific entrypoint or command that handles the ID argument, or if the specified command is not an executable file named ID, the container will likely terminate with an error because it cannot find such an executable or command.

To display the user identifier inside the container, you need to explicitly specify the id command in docker run:

docker run alpine id

This will output the user ID of the process inside the container. By default, in most images (including alpine), this will be the root user, and the ID will be 0.

If you want the ID command to be executed inside the container, assuming an executable with that name exists (which is highly unlikely in standard images), the command docker run alpine ID will attempt to run it as the main container command.

Summary: No "local container ID" in terms of user or group ID will be displayed if ID is not an executable command inside the alpine container and does not redirect the ID output. In standard usage of alpine, the command docker run alpine ID will most likely fail. To see the user ID, explicitly run the id command.