Book Image

Podman for DevOps

By : Alessandro Arrichiello, Gianni Salinetti
Book Image

Podman for DevOps

By: Alessandro Arrichiello, Gianni Salinetti

Overview of this book

As containers have become the new de facto standard for packaging applications and their dependencies, understanding how to implement, build, and manage them is now an essential skill for developers, system administrators, and SRE/operations teams. Podman and its companion tools Buildah and Skopeo make a great toolset to boost the development, execution, and management of containerized applications. Starting with the basic concepts of containerization and its underlying technology, this book will help you get your first container up and running with Podman. You'll explore the complete toolkit and go over the development of new containers, their lifecycle management, troubleshooting, and security aspects. Together with Podman, the book illustrates Buildah and Skopeo to complete the tools ecosystem and cover the complete workflow for building, releasing, and managing optimized container images. Podman for DevOps provides a comprehensive view of the full-stack container technology and its relationship with the operating system foundations, along with crucial topics such as networking, monitoring, and integration with systemd, docker-compose, and Kubernetes. By the end of this DevOps book, you'll have developed the skills needed to build and package your applications inside containers as well as to deploy, manage, and integrate them with system services.
Table of Contents (19 chapters)
1
Section 1: From Theory to Practice: Running Containers with Podman
7
Section 2: Building Containers from Scratch with Buildah
12
Section 3: Managing and Integrating Containers Securely

Summary

In this chapter, we have learned how to leverage Podman's companion, Buildah, in some advanced scenarios to support our development projects.

We saw how to use Buildah for multistage container image creation, which allows us to create builds with multiple stages using different FROM instructions and, subsequently, to have images that grab contents from the previous ones.

Then, we discovered that there are many use cases that imply the need for containerized builds. Nowadays, one of the most common adoption scenarios is the application build workflow running on top of a Kubernetes cluster. For this reason, we went into the details of containerizing Buildah.

Finally, we learned through a lot of interesting examples how to integrate Buildah to create custom builders for container images. As we saw in this chapter, there are several options and methods to actually build a container image with the Podman ecosystem tools, and most of the time, we usually start from...