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

Container networking and Podman setup

In this section, we'll cover Podman's networking implementation and how to configure networks. Podman 4.0.0 introduced an important change to the network stack. However, Podman 3 is still widely used in the community. For this reason, we will cover both implementations.

Podman 3 leverages the Container Network Interface (CNI) to manage local networks that are created on the host. The CNI provides a standard set of specifications and libraries to create and configure plugin-based network interfaces in a container environment.

CNI specifications were created for Kubernetes to provide a network configuration format that's used by the container runtime to set up the defined plugins, as well as an execution protocol between plugin binaries and runtimes. The great advantage of this plugin-based approach is that vendors and communities can develop third-party plugins that satisfy the CNI's specifications.

The Podman 4 network...