Docker Deep Dive, Poulton N., 2023

Docker Deep Dive, Poulton N., 2023.
 
   Docker is software that runs on Linux and Windows. It creates, manages, and can even orchestrate containers. The software is currently built from various tools from the Moby open-source project. Docker, Inc. is the company that created the technology and continues to create technologies and solutions that make it easier to get the code on your laptop running in the cloud.




Images are usually small.
The whole purpose of a container is to run a single application or service. This means it only needs the code and dependencies of the app it’s running — it doesn’t need anything else. This means images are also small and stripped of all non-essential parts.

For example, at the time of writing the official Alpine Linux image is 7MB. This is because it doesn’t ship with 6 different shells, three different package managers and more... In fact, a lot of images ship without a shell or a package manager - if the application doesn’t need it, it doesn’t get included in the image.

Images don’t include a kernel. This is because containers share the kernel of the host they’re running on. It’s normal for the only OS components included in an image to be a few important filesystem components and other basic constructs. This is why you’ll sometimes hear people say “images contain just enough OS”.

Contents.
Cover Page.
Table of Contents.
Part 1: The big picture stuff.
1: Containers from 30,000 feet.
2: Docker.
3: Installing Docker.
4: The big picture.
Part 2: The technical stuff.
5: The Docker Engine.
6: Images.
7: Containers.
8: Containerizing an app.
9: Multi-container apps with Compose.
10: Docker Swarm.
11: Docker Networking.
12: Docker overlay networking.
13: Volumes and persistent data.
14: Deploying apps with Docker Stacks.
15: Security in Docker.
16: What next.



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