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

Generating Kubernetes YAML resources

Kubernetes has become the de facto standard for multi-node container orchestration. Kubernetes clusters allow multiple pods to be executed across nodes according to scheduling policies that reflect the node's load, labels, capabilities, or hardware resources (for example, GPUs).

We have already described the concept of a pod – a single execution group of one or more containers that share common namespaces (network, IPC, and, optionally, PID namespaces). In other words, we can think of pods as sandboxes for containers. Containers inside a Pod are executed and thus started, stopped, or paused simultaneously.

One of the most promising features that was introduced by Podman is the capability to generate Kubernetes resources in YAML format. Podman can intercept the configuration of running containers or pods and generate a Pod resource that is compliant with Kubernetes API specifications.

Along with pods, we can generate Service...