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Podman for DevOps

You're reading from   Podman for DevOps Containerization reimagined with Podman and its companion tools

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Product type Paperback
Published in Apr 2022
Publisher Packt
ISBN-13 9781803248233
Length 518 pages
Edition 1st Edition
Tools
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Authors (2):
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Gianni Salinetti Gianni Salinetti
Author Profile Icon Gianni Salinetti
Gianni Salinetti
Alessandro Arrichiello Alessandro Arrichiello
Author Profile Icon Alessandro Arrichiello
Alessandro Arrichiello
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Toc

Table of Contents (19) Chapters Close

Preface 1. Section 1: From Theory to Practice: Running Containers with Podman
2. Chapter 1: Introduction to Container Technology FREE CHAPTER 3. Chapter 2: Comparing Podman and Docker 4. Chapter 3: Running the First Container 5. Chapter 4: Managing Running Containers 6. Chapter 5: Implementing Storage for the Container's Data 7. Section 2: Building Containers from Scratch with Buildah
8. Chapter 6: Meet Buildah – Building Containers from Scratch 9. Chapter 7: Integrating with Existing Application Build Processes 10. Chapter 8: Choosing the Container Base Image 11. Chapter 9: Pushing Images to a Container Registry 12. Section 3: Managing and Integrating Containers Securely
13. Chapter 10: Troubleshooting and Monitoring Containers 14. Chapter 11: Securing Containers 15. Chapter 12: Implementing Container Networking Concepts 16. Chapter 13: Docker Migration Tips and Tricks 17. Chapter 14: Interacting with systemd and Kubernetes 18. Other Books You May Enjoy

Attaching host storage to a container

We have already talked about the immutable nature of containers. Starting from pre-built images, when we run a container, we instance a read/write layer on top of a stack of read-only layers using a copy-on-write approach.

Containers are ephemeral objects based on a stateful image. This implies that containers are not meant to store data inside them – if a container crashes or is removed, all the data would be lost. We need a way to store data in a separate location that is mounted inside the running container, preserved when the container is removed, and ready to be reused by a new container.

There is another important caveat that should not be forgotten – secrets and config files. When we build an image, we can pass all the files and folders we need inside it. However, sealing secrets like certificates or keys inside a build is not a good practice. If we need, for example, to rotate a certificate, we must rebuild the whole...

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