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

Exposing containers outside our underlying host

Container adoption in an enterprise company or a community project could be a hard thing to do that could require time. For this reason, we may not have all the required services running as containers during our adoption journey. This is why exposing containers outside our underlying host could be a nice solution for interconnecting services that live in containers to services that run in the legacy world.

As we briefly saw earlier in this chapter, Podman uses two different networking stacks, depending on the container: rootless or rootfull.

Even though the underlying mechanism is slightly different, depending on if you are using a rootless or a rootfull container, Podman's command-line options for exposing network ports are the same for both container types.

Good to Know

Note that the example we are going to see in this section will be executed as a root user. This choice was necessary because the main objective of this...