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

Running Kubernetes resource files in Podman

Now that we've learned how to generate Kubernetes YAML files containing the necessary resources to deploy our applications, we want to test them in a real scenario.

For this book, we will use the WordPress application again, both in its simple form with a single container and in its multi-pod variation.

The following examples are also available in this book's GitHub repository – you can choose to use the resources that have been generated from your labs or use the prepared manifests in this book's repository.

Important Note

Don't forget to clean up all the previous workloads before testing the creation of Kubernetes resources with Podman.

For all our examples, we will use the podman play kube command. It offers us an easy and intuitive interface for managing the execution of complex stacks with a good degree of customization.

The first example will be based on the single-pod manifest:

$ podman...