Docker's core concepts and commands

Author: Zen and the Art of Computer Programming

1 Introduction

1. Docker is an open source container technology framework that can package applications into a lightweight, portable, self-describing container image, making it easy to create and deploy the application.
   2. Docker uses the core mechanisms of the Linux kernel, cgroup and namespace, to provide a lightweight virtualization environment, and combines AUFS, DeviceMapper and other technologies to achieve isolation and resource restrictions.
   3. The image building process can be defined through Dockerfile, which separates the build environment and the final operating environment, making it easier to expand.
   4. Docker manages all generated images through the image warehouse (Registry). Users can download or upload images from the remote warehouse through the pull or push command to achieve version management and sharing.
   5. Docker can be used to automatically build and deploy applications, and supports cluster management and microservice architecture.

   11. The first chapter introduces what containers, Docker, and its main concepts and features are to help readers quickly understand the related concepts of Docker.
   12. Chapter 2 introduces Docker's architecture, its components, composition, installation and deployment, and related terminology in detail.
   13. The third chapter mainly introduces the basics of Docker image construction, including Dockerfile syntax, image layer, multi-stage construction, pushing to remote image warehouse, local cache, etc.
   14. In Chapter 4, the author introduces the Docker network model, external access and internal connections, the use of custom network plug-ins, inter-container communication, logging and persistent storage in detail.
   15. Chapter 5 introduces Docker data management, backup and recovery, high-availability clusters, and Compose file orchestration tools.
   16. In Chapter 6, the author briefly introduces some Docker security mechanisms, including authentication, authorization, encrypted transmission, image scanning, etc.
   17. The last chapter answers some questions raised by the author.

   2. Explanation of basic concepts and terms

   1. Container