# Docker Image and Docker File

**URL:** <https://forums.docker.com/t/docker-image-and-docker-file/65614>\
**Category:** General\
**Created:** [December 22, 2018, 5:03pm UTC](https://forums.docker.com/t/docker-image-and-docker-file/65614 "2018-12-22T17:03:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![grajee](https://avatars.discourse-cdn.com/v4/letter/g/c57346/32.png) [@grajee](https://forums.docker.com/u/grajee)\
**Post date:** [December 22, 2018, 5:03pm UTC](https://forums.docker.com/t/docker-image-and-docker-file/65614/1 "2018-12-22T17:03:37Z")

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All,

I’m new to Docker and I’m learning the Windows version of it. I have a question and I believe it is a generic one.

The below command builds a docker image from the docker file.

> “docker image build --tag dockeronwindows/ch02-powershell-env .”

But where is the docker file specified here? Is there a default location and a default file name it looks for?

grajee

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**Author:** ![pennacook](https://sea3.discourse-cdn.com/docker/user_avatar/forums.docker.com/pennacook/32/13977_2.png) [@pennacook](https://forums.docker.com/u/pennacook)\
**Post date:** [January 7, 2019, 5:09pm UTC](https://forums.docker.com/t/docker-image-and-docker-file/65614/2 "2019-01-07T17:09:00Z")

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Might want to review [https://docs.docker.com/develop/develop-images/dockerfile\_best-practices/#understand-build-context](https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#understand-build-context)

By default, docker looks for a Dockerfile.