Chapter 5. Building and Sharing Docker Images
Docker images are an essential part of containerized applications, providing a lightweight, portable, and consistent runtime environment. In previous chapters, we covered how to run containers using pre-built images from Docker Hub, but what if you need a customized setup for your application? That’s where building and managing your own Docker images becomes important.
In this chapter, we’ll explore how to create images using Dockerfiles, optimize builds with a .dockerignore file, and share images across teams and repositories. Understanding these concepts is crucial for maintaining efficiency, consistency, and security in your development and deployment workflow.
So far, we've worked with Docker Official Images—trusted, well-maintained base images provided by Docker and its community. These images, such as those used in previous chapters, offered a ready-to-use environment for running applications. However, we haven’t yet explored how to create custom images tailored to specific project requirements or how to share them through a repository. This chapter bridges that gap, ensuring you have the necessary skills to build and distribute your own Docker images effectively.
Docker Official Images vs. Custom Images
Before building your own Docker images, it’s important to understand the different types of images available. In Docker, an image is a packaged environme
FAQ: Building and Managing Docker Images
What are Docker Official Images?
Docker Official Images are pre-built, publicly available images maintained by Docker and its community. They follow best practices, receive security updates, and are verified for reliability, providing ready-to-use environments for various applications.
What are Custom Images?
Custom Images are Docker images that you build yourself to meet specific needs. They allow you to add required software, configure settings, optimize performance, and ensure consistency across environments.
When should I use Docker Official Images?
Use Docker Official Images when you need a stable, secure, and well-tested foundation for your application. They are ideal for standard use cases where reliability is key.
When should I use Custom Images?
Use Custom Images when your project requires additional software, specific configurations, or optimizations beyond what an official image provides. They offer complete control over the application environment.
What is a Dockerfile?
A Dockerfile is a text file containing step-by-step instructions for building a Docker image. It acts as a blueprint, ensuring consistency and automation in the containerization process.
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