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Defining Our First Custom Image

Defining Our First Custom Image

Learn how to use Dockerfile to build your own Rails image.

Build image

The process of generating an image from a Dockerfile is called building an image. We do that with the docker build command, which has the following format:

$ docker build [options] path/to/build/directory 

If we are in the directory containing our Dockerfile and project file, we can use the following command:

$ docker build . 
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