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Docker Quick Start Guide

Docker Quick Start Guide

By : Waud
4.7 (12)
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Docker Quick Start Guide

Docker Quick Start Guide

4.7 (12)
By: Waud

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.
Table of Contents (10 chapters)
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Preface
Preface
Who this book is for
What this book covers
To get the most out of this book
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1
Setting up a Docker Development Environment
Setting up a Docker Development Environment
Technical requirements
Setting up your Docker development environment
What differences to watch out for between OSes
Summary
2
Learning Docker Commands
Learning Docker Commands
Technical requirements
Information about command syntax
The version command
The Docker run command
Summary
3
Creating Docker Images
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Creating Docker Images
Technical requirements
What is a Dockerfile?
The FROM instruction
The LABEL instruction
The COPY instruction
The ADD instruction
The ENV instruction
The ARG instruction
The USER instruction
The WORKDIR instruction
The VOLUME instruction
The EXPOSE instruction
The RUN instruction
The CMD instruction
The ENTRYPOINT instruction
The HEALTHCHECK instruction
The ONBUILD instruction
The STOPSIGNAL instruction
The SHELL instruction
The Docker image build command
Summary
4
Docker Volumes
Docker Volumes
Technical requirements
What is a Docker volume?
Creating Docker volumes
Removing volumes
Sharing data between containers with data volume containers
Summary
5
Docker Swarm
Docker Swarm
Technical requirements
What is Docker swarm?
How to set up a Docker swarm cluster
Managers and workers
Swarm services
Accessing container applications in a swarm
Summary
6
Docker Networking
Docker Networking
Technical requirements
What is a Docker network?
Built-in (local) Docker networks
Third-party (remote) network drivers
Creating Docker networks
Free networking features
Which Docker network driver should I use?
Summary
7
Docker Stacks
Docker Stacks
Technical requirements
Understanding the use of Docker stacks
How to create and use a compose YAML files for Stacks
The rest of the stack commands
Best practices for scaling a stack application
Summary
8
Docker and Jenkins
Docker and Jenkins
Technical requirements
Using Jenkins to build Docker images
Setting up a Dockerized Jenkins server
Building Docker images inside of a Dockerized Jenkins server
Using Docker containers for your Jenkins build nodes
Building, testing, and pushing Docker images inside Dockerized build nodes
Summary
9
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The HEALTHCHECK instruction

The HEALTHCHECK instruction, which is a fairly new addition to the Dockerfile, is used to define the command to run inside a container to test the container's application health. When a container has a HEALTHCHECK, it gets a special status variable. Initially, that variable will be set to starting. Any time a HEALTHCHECK is performed successfully, the status will be set to healthy. When a HEALTHCHECK is performed and fails, the fail count value will be incremented and then checked against a retries value. If the fail count equals or exceeds the retries value, the status is set to unhealthy. The syntax of the HEALTHCHECK instruction is as follows:

# HEALTHCHECK instruction syntax
HEALTHCHECK [OPTIONS] CMD command (check container health by running a command inside the container)
HEALTHCHECK NONE (disable any HEALTHCHECK inherited from the base image...

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