As we learned in Chapter 3, Creating Docker Images, Docker uses a special filesystem called a Union File System. This is the key to Docker's layered image model and allows for many of the features that make using Docker so desirable. However, the one thing that the Union File System does not provide for is the persistent storage of data. If you recall, the layers of a Docker image are read-only. When you run a container from a Docker image, the Docker daemon creates a new read-write layer that holds all of the live data that represents your container. When your container makes changes to its filesystem, those changes go into that read-write layer. As such, when your container goes away, taking the read-write layer goes with it, and any and all changes the container made to data within that layer are deleted and gone forever. That equals non-persistent...
Docker Quick Start Guide
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Docker Quick Start Guide
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Overview of this book
Docker is an open source software platform that helps you with creating, deploying, and running your applications using containers. This book is your ideal introduction to Docker and containerization.
You will learn how to set up a Docker development environment on a Linux, Mac, or Windows workstation, and learn your way around all the commands to run and manage your Docker images and containers.
You will explore the Dockerfile and learn how to build your own enterprise-grade Docker images. Then you will learn about Docker networks, Docker swarm, and Docker volumes, and how to use these features with Docker stacks in order to define, deploy, and maintain highly-scalable, fault-tolerant multi-container applications.
Finally, you will learn how to leverage Docker with Jenkins to automate the building of Docker images and the deployment of Docker containers. By the end of this book, you will be well prepared when it comes to using Docker for your next project.
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Current Title:
Docker Quick Start Guide
Table of Contents (10 chapters)
Preface
Free Chapter
Setting up a Docker Development Environment
Learning Docker Commands
Creating Docker Images
Docker Volumes
Docker Swarm
Docker Networking
Docker Stacks
Docker and Jenkins
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