Book Image

Continuous Delivery with Docker and Jenkins, 3rd Edition - Third Edition

By : Rafał Leszko
Book Image

Continuous Delivery with Docker and Jenkins, 3rd Edition - Third Edition

By: Rafał Leszko

Overview of this book

This updated third edition of Continuous Delivery with Docker and Jenkins will explain the advantages of combining Jenkins and Docker to improve the continuous integration and delivery process of app development. You’ll start by setting up a Docker server and configuring Jenkins on it. Next, you’ll discover steps for building applications and microservices on Dockerfiles and integrating them with Jenkins using continuous delivery processes such as continuous integration, automated acceptance testing, configuration management, and Infrastructure as Code. Moving ahead, you'll learn how to ensure quick application deployment with Docker containers, along with scaling Jenkins using Kubernetes. Later, you’ll explore how to deploy applications using Docker images and test them with Jenkins. Toward the concluding chapters, the book will focus on missing parts of the CD pipeline, such as the environments and infrastructure, application versioning, and non-functional testing. By the end of this continuous integration and continuous delivery book, you’ll have gained the skills you need to enhance the DevOps workflow by integrating the functionalities of Docker and Jenkins.
Table of Contents (16 chapters)
1
Section 1 – Setting Up the Environment
5
Section 2 – Architecting and Testing an Application
9
Section 3 – Deploying an Application

Docker networking

Most applications these days do not run in isolation; they need to communicate with other systems over the network. If we want to run a website, web service, database, or cache server inside a Docker container, we need to first understand how to run a service and expose its port to other applications.

Running services

Let's start with a simple example and run a Tomcat server directly from Docker Hub, as follows:

$ docker run -d tomcat

Tomcat is a web application server whose UI can be accessed by port 8080. Therefore, if we installed Tomcat on our machine, we could browse it at http://localhost:8080. In our case, however, Tomcat is running inside the Docker container.

We started it the same way we did with the first Hello World example. We can see that it's running, as follows:

$ docker ps
CONTAINER ID IMAGE  COMMAND          &...