Development life cycle

The Docker development life cycle can be explained with the help of the following steps:

1. Docker container development starts with downloading a base image from Docker Hub. Ubuntu and Fedora are a few images available from Docker Hub. An application can be containerized post application development too. It is not necessary to always start with Dockerizing the application.
2. The image is customized as per application requirement using a few Docker-specific instructions. These sets of instructions are stored in a file called Dockerfile. When deployed the Docker daemon reads the Dockerfile and prepares the final image.
3. The image can then be published to a public/private repository.
4. When users run the following command on any Docker host, the Docker daemon searches for images on the local machine first and then on Docker Hub if the images are not found locally. A Docker container is created if the image is found. Once the container is up and running, [command] is called on the running container:

       $ docker run -i -t [imagename] [command]