June 2016
Intermediate to advanced
59 pages
1h 10m
English
Content preview from Docker for Java Developers
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 2. Docker and Your First Application
This chapter explains how to build and run your first Docker container using Java.
You’ll learn the syntax needed to create Docker images using Dockerfiles and run them as a containers. Sharing these images using Docker Hub is explained. Deploying a sample Java EE application using prebuilt Docker images is then covered. This application will consist of an application server and a database container on a single host. The application will be deployed using Docker Compose and Docker Swarm. The same application will also be deployed using Kubernetes.
Dockerfile
Docker builds images by reading instructions from a text document, usually called a Dockerfile. This file contains all the commands a user can usually call on the command line to assemble an image. The docker build command uses this file and executes all the instructions in this file to create an image.
The build command is also passed a context that is used during image creation. This context can be a path on your local filesystem or a URL to a Git repository. The context is processed recursively, which means any subdirectories on the local filesystem path and any submodules of the repository are included.
It’s recommended to start with an empty directory in order to keep the build process simple. Any directories or files that need to be included in the image can be added to the context.
A file named .dockerignore may be included in the root directory of the context. This file ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.