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Learning Continuous Integration with Jenkins
Learning Continuous Integration with Jenkins

Learning Continuous Integration with Jenkins:

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Learning Continuous Integration with Jenkins

Chapter 2. Setting up Jenkins

The current chapter is all about installing Jenkins across various platforms. We will begin with a short introduction to Jenkins and the components that make it. We will also explore why Jenkins is a better choice than the other Continuous Integration tools, and how it fits in as a Continuous Integration server.

Later in the chapter, we will go through an in-detail installation of Jenkins inside a container (the Apache Tomcat server), followed by an analysis of the merits of such an approach, thereby answering why most organizations choose to use Jenkins inside a Web Server.

Last but not least, we will see how to install Jenkins across various types of operating systems as a standalone application.

Introduction to Jenkins

Jenkins is an open source Continuous Integration tool. However, it's not limited to Continuous Integration alone. In the upcoming chapters, we will see how Jenkins can be used to achieve Continuous Delivery, Continuous Testing, and Continuous Deployment. Jenkins is supported by a large number of plugins that enhance its capability. The Jenkins tool is written in Java and so are its plugins. The tool has a minimalistic GUI that can be enhanced using specific plugins if required.

What is Jenkins made of?

Let's have a look at the components that make up Jenkins. The Jenkins framework mainly contains jobs, builds, parameters, pipelines and plugins. Let's look at them in detail.

Jenkins job

At a higher level, a typical Jenkins job contains a unique name, a description, parameters, build steps, and post-build actions. This is shown in the following screenshot:

Jenkins job

Jenkins parameters

Jenkins parameters can be anything: environment variables, interactive values, pre...

Running Jenkins inside a container

Jenkins can be installed as a service inside the following containers:

  • Apache Geronimo 3.0
  • Glassfish
  • IBM WebSphere
  • JBoss
  • Jetty
  • Jonas
  • Liberty profile
  • Tomcat
  • WebLogic

In the current section, we will see how to install Jenkins on the Apache Tomcat server.

Installing Jenkins as a service on the Apache Tomcat server

Installing Jenkins as a service on the Apache Tomcat server is pretty simple. We can either choose to use Jenkins along with other services already present on the Apache Tomcat server, or we may use the Apache server solely for Jenkins.

Prerequisites

I assume that the Apache Tomcat server is installed on the machine where you intend to run Jenkins. In the following section, we will use the Apache Tomcat server 8.0. Nevertheless, Apache Tomcat server 5.0 or greater is sufficient to use Jenkins. A machine with 1 GB RAM is enough to start with. However, as the number of jobs and builds increase, so should the memory.

We also need Java running on the machine. In this...

Running Jenkins as a standalone application

Installing Jenkins as a standalone application is simpler than installing Jenkins as a service inside a container. Jenkins is available as a standalone application on the following operating systems:

  • Windows
  • Ubuntu/Debian
  • Red Hat/Fedora/CentOS
  • Mac OS X
  • openSUSE
  • FreeBSD
  • openBSD
  • Gentoo

Setting up Jenkins on Windows

There are two ways in which you can set up Jenkins on Windows. One is by using the Jenkins native package for Windows, and the other is through the jenkins.war file.

Installing Jenkins using the native Windows package

The following are the steps to install Jenkins using the native Windows package:

  1. To download the latest stable Jenkins package for Windows go to the link https://jenkins.io/download/.
  2. Once on the page, click on the Download Jenkins link, as shown in the following screenshot:
    Installing Jenkins using the native Windows package
  3. Now, click on the drop-down button and select Windows.
    Installing Jenkins using the native Windows package
  4. Once the download completes, unzip the archive file and you will find a setup.exe.
    Installing Jenkins using the native Windows package
  5. Run the Setup.exe and follow...

Sample use cases

It is always good to learn from others' experiences. The following are the use cases published by some famous organizations that can give us some idea of the hardware specification.

Netflix

In 2012, Netflix had the following configuration:

Hardware configuration:

  • 2x quad core x86_64 for the Jenkins master with 26 GB RAM
  • 1 Jenkins master with 700 engineers using it
  • Elastic slaves with Amazon EC2 + 40 ad-hoc slaves in Netflix's data center

Work load:

  • 1,600 Jenkins jobs
  • 2,000 Builds per day
  • 2 TB of build data

Yahoo!

In 2013, Yahoo! had the following configuration:

Hardware configuration:

  • 2 x Xeon E5645 2.40GHz, 4.80GT QPI (HT enabled, 12 cores, 24 threads) with 96 GB RAM, and 1.2 TB of disk space
  • 1 Jenkins master with 1,000 engineers using it
  • 48 GB max heap to JVM
  • $JENKINS_HOME* lives on NetApp
  • 20 TB filer volume to store Jenkins job and build data
  • 50 Jenkins slaves in three data centers

Workload:

  • 13,000 Jenkins jobs
  • 8,000 builds per day

    Note

    $JENKINS_HOME is the environment variable that...

Summary

In this chapter, we saw the various constituents that make up Jenkins and its hardware specifications. We also saw how Jenkins can be installed as a service inside a container such as the Apache Tomcat server, along with its advantages. We discussed this example because most of the real world Jenkins servers run solely on the Apache Tomcat server. We also saw Jenkins installation on Windows, Ubuntu, and Fedora as a standalone application.

The details about configuring Jenkins were kept to a minimum, as the main objective of the current chapter was to show how diverse Jenkins is when it comes to the installation process and the variety of operating systems that it supports.

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Key benefits

  • Speed up and increase software productivity and software delivery using Jenkins
  • Automate your build, integration, release, and deployment processes with Jenkins—and learn how continuous integration (CI) can save you time and money
  • Explore the power of continuous delivery using Jenkins through powerful real-life examples

Description

In past few years, Agile software development has seen tremendous growth across the world. There is huge demand for software delivery solutions that are fast yet flexible to frequent amendments. As a result, CI and continuous delivery methodologies are gaining popularity. Jenkins’ core functionality and flexibility allows it to fit in a variety of environments and can help streamline the development process for all stakeholders. This book starts off by explaining the concepts of CI and its significance in the Agile world with a whole chapter dedicated to it. Next, you’ll learn to configure and set up Jenkins. You’ll gain a foothold in implementing CI and continuous delivery methods. We dive into the various features offered by Jenkins one by one exploiting them for CI. After that, you’ll find out how to use the built-in pipeline feature of Jenkins. You’ll see how to integrate Jenkins with code analysis tools and test automation tools in order to achieve continuous delivery. Next, you’ll be introduced to continuous deployment and learn to achieve it using Jenkins. Through this book’s wealth of best practices and real-world tips, you'll discover how easy it is to implement a CI service with Jenkins.

Who is this book for?

This book is for anyone who wants to exploit the power of Jenkins. This book servers a great starting point for those who are in the field DevOps and would like to leverage the benefits of CI and continuous delivery in order to increase productivity and reduce delivery time.

What you will learn

  • Take advantage of a continuous delivery solution to achieve faster software delivery
  • Speed up productivity using a continuous Integration solution through Jenkins
  • Understand the concepts of CI and continuous delivery
  • Orchestrate many DevOps tools using Jenkins to automate builds, releases, deployment, and testing
  • Explore the various features of Jenkins that make DevOps activities a piece of cake
  • Configure multiple build machines in Jenkins to maintain load balancing
  • Manage users, projects, and permissions in Jenkins to ensure better security
  • Leverage the power of plugins in Jenkins

Product Details

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Publication date : May 31, 2016
Length: 542 pages
Edition : 1st
Language : English
ISBN-13 : 9781785285035
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Product Details

Publication date : May 31, 2016
Length: 542 pages
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Language : English
ISBN-13 : 9781785285035
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Table of Contents

9 Chapters
1. Concepts of Continuous Integration Chevron down icon Chevron up icon
2. Setting up Jenkins Chevron down icon Chevron up icon
3. Configuring Jenkins Chevron down icon Chevron up icon
4. Continuous Integration Using Jenkins – Part I Chevron down icon Chevron up icon
5. Continuous Integration Using Jenkins – Part II Chevron down icon Chevron up icon
6. Continuous Delivery Using Jenkins Chevron down icon Chevron up icon
7. Continuous Deployment Using Jenkins Chevron down icon Chevron up icon
8. Jenkins Best Practices Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.8
(4 Ratings)
5 star 75%
4 star 25%
3 star 0%
2 star 0%
1 star 0%
ketan sanjay kanade Aug 07, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
awesome book. must try it.
Amazon Verified review Amazon
Thomas Dao Jun 10, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I've had the pleasure to be the technical reviewer for this book and it will be a great resource for anyone who is in the build/release or devops space that is implementing continuous integration/continuous deployment and delivery at their organization.The book is very good at outlining how to setup your environment for Jenkins in conjunction with other continuous integration tools such as git, maven and artifactory. It dives into the inner workings of Jenkins and how to setup builds, triggers and automated test suites. It also talks about the best practices for Jenkins and has a good discussion on the distinction between continuous delivery and continuous deployment.
Amazon Verified review Amazon
Amazon Customer Jan 07, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent Book in Jenkins who want to lean end to end in Jenkins
Amazon Verified review Amazon
David Aug 14, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
very educational covers a lot of products apart from jenkins. little bit out dated.
Amazon Verified review Amazon
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