Images Are Created Locally

When I run the docker build command to create an image from a Dockerfile file, the resultant image is stored locally on the computer where the docker build command is run.

This allows me to run as many containers as I want from the locally created image, but the chances are that I want other computers to be able to run containers from the image I created. We’ll learn how to do that in the next chapter.

I can see the images available locally on my computer by running the following command:

Considering, the images I built earlier, I can see something along those lines:

Having the images readily available locally makes it faster to run a container from them. However, there will be a time when some images are useless. I can remove them from my local machine using the docker rmi command and providing it the image name or image ID.

For instance, I could remove the webserver:latest image using any of the following two commands:

Before we move on to tags, try the exercise in the next lesson.