Creating Docker images
There are three ways to create a new container image on your system. The first one is by interactively building a container that contains all the additions and changes you desire, and then committing those changes into a new image. The second, and most important, way is to use a Dockerfile to describe what’s in the new image, and then build the image using that Dockerfile as a manifest. Finally, the third way of creating an image is by importing it into the system from a tarball.
Now, let’s look at these three ways in detail.
Interactive image creation
The first way we can create a custom image is by interactively building a container. That is, we start with a base image that we want to use as a template and run a container of it interactively. Let’s say that this is the Alpine image:
- The command to run the container would be as follows:
$ docker container run -it \ --name sample \ ...
