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

Introducing Universal Base Image

When working on enterprise environments, many users and companies adopt RHEL as the operating system of choice to execute workloads reliably and securely. RHEL-based container images are available too, and they take advantage of the same package versioning as the OS release. All the security updates that are released for RHEL are immediately applied to OCI images, making them wealthy, secure images to build production-grade applications with.

Unfortunately, RHEL images are not publicly available without a Red Hat subscription. Users who have activated a valid subscription can use them freely on their RHEL systems and build custom images on top of them, but they are not freely redistributable without breaking the Red Hat enterprise agreement.

So, why worry? There are plenty of commonly used images that can replace them. This is true, but when it comes to reliability and security, many companies choose to stick to an enterprise-grade solution and...