Creating images with a Dockerfile
This recipe explores image creation with Dockerfiles. Docker images can be created in multiple ways, which includes using Dockerfiles, using docker commit to save the container state as a new image, or using docker import, which imports chroot directory structure as a Docker image.
In this recipe, we will focus on
Dockerfiles and related details. Dockerfiles help in automating identical and repeatable image creation. They contain multiple commands in the form of instructions to build a new image. These instructions are then passed to the Docker daemon through the docker build command. The Docker daemon independently executes these commands one by one. The resulting images are committed as and when necessary, and it is possible that multiple intermediate images are created. The build process will reuse existing images from the image cache to speed up build process.
Getting ready
Make sure that your Docker daemon is installed and working properly.
