Building An Image

Once you have a Dockerfile, docker build turns it into an image. The -t flag gives the new image a name (tag), and the . tells Docker to use the current directory as the build context:

docker build -t myimage .

Docker runs each Dockerfile instruction in order, printing a Step line for each one, and finishes with:

Successfully built ...
Successfully tagged myimage:latest

After this, myimage shows up in docker images and you can run it like any other image.