![]() We’ll cover these two methods in more detail later in this guide. Dockerfile: By constructing a plain-text file, known as a Dockerfile, which provides the specifications for creating a Docker.Interactive: By running a container from an existing Docker image, manually changing that container environment through a series of live steps, and saving the resulting state as a new image. ![]() You can create a Docker image by using one of two methods: Anatomy of a Docker ImageĪ Docker image is made up of a collection of files that bundle together all the essentials – such as installations, application code, and dependencies – required to configure a fully operational container environment. Docker images are also the starting point for anyone using Docker for the first time. It provides a convenient way to package up applications and preconfigured server environments, which you can use for your own private use or share publicly with other Docker users. But first, let’s cover the basics and look at the composition of a Docker image in detail.Ī Docker image is a read-only template containing a set of instructions for creating a container that can run on the Docker platform. So, we’ll briefly cover how to create Docker images for deploying your code and assembling container-based services. In this introduction, we’ll not only take you through the basics of Docker images, but also show you where to find ready-made, off-the-shelf images that will give you a head start in building your own containerized applications, tools, and services.Īs a new Docker user, you’ll also need to understand how to build your own custom images.
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