January 2023
Intermediate to advanced
242 pages
4h 38m
English
Content preview from GitOps Cookbook
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Chapter 3. Containers
Containers are a popular and standard format for packaging applications. The format is an open standard promoted by the Open Container Initiative (OCI), an open governance structure for the express purpose of creating open industry standards around container formats and runtimes. The openness of this format ensures portability and interoperability across different operating systems, vendors, platforms, or clouds. Kubernetes runs containerized apps, so before going into the GitOps approach to managing apps on Kubernetes, we provide a list of recipes useful for understanding how to package your application as a container image.
The first step for creating images is to use a container engine for packaging your application by building a layered structure containing a base OS and additional layers on top such as runtimes, libraries, and applications. Docker is a widespread open source implementation of a container engine and runtime, and it can generate a container image by specifying a manifest called a Dockerfile (see Recipe 3.1).
Since the format is open, it’s possible to create container images with other tools. Docker, a popular container engine, requires the installation and the execution of a daemon that can handle all the operations with the container engine. Developers can use a software development kit (SDK) to interact with the Docker daemon or use dockerless solutions such as JiB to create container images (see Recipe 3.2).
If you don’t want to rely ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.