Book Image

Docker Quick Start Guide

By : Earl Waud
Book Image

Docker Quick Start Guide

By: Earl 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)

The COPY instruction

You have already seen an example of using the COPY instruction in the hello-world Dockerfile shown in The FROM instruction section. The COPY instruction is used to copy files and folders into the Docker image being built. The syntax for the COPY instruction is as follows:

# COPY instruction syntax
COPY [--chown=<user>:<group>] <src>... <dest>
# Use double quotes for paths containing whitespace)
COPY [--chown=<user>:<group>] ["<src>",... "<dest>"]

Note that the --chown parameter is only valid for Linux-based containers. Without the --chown parameter, the owner ID and group ID will both be set to 0.

The <src> or source is a filename or folder path and is interpreted to be relative to the context of the build. We will talk more about the build context later in this chapter, but for now, think...