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Home > Cloud & Networking > DevOps > DevOps for Web Development
DevOps for Web Development
DevOps for Web Development

DevOps for Web Development: Achieve the Continuous Integration and Continuous Delivery of your web applications with ease

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DevOps for Web Development

Chapter 2. Continuous Integration with Jenkins 2

"The way to get started is to quit talking and begin doing."                                                                       -Walt Disney

Jenkins 2 has arrived. It comes with built-in support for delivery pipelines, improved usability, a new setup experience, and complete backward compatibility with existing Jenkins installations. We will be using Jenkins 2 in this book.

This chapter describes in detail how Jenkins plays an important role in continuous integration. It covers how to prepare a runtime environment for application lifecycle management and configure it with Jenkins...

Introduction

We all know what Continuous Integration (CI) is, right? It is the first step in our journey.

 

"The journey of a thousand miles begins with one step."

 
 -- Lao Tzu, the father of Taoism

In simple words, CI is a software engineering practice where each check-in made by a developer is verified by either of the following:

  • Pull mechanism: Executing an automated build at a scheduled time
  • Push mechanism: Executing an automated build when changes are saved in the repository

This step is followed by executing a unit test against the latest changes available in the source code repository.

Jenkins doesn't need the introduction; it is an open source and one the most popular CI tools available in the market. It helps in automating the repetitive task of CI. Jenkins makes the process effective and transparent.

 

"We are what we repeatedly do. Excellence, then, is not an act, but a habit."

 
 -- Aristotle

The next question you may ask is what...

Installing Jenkins

Jenkins provides us with multiple ways to install it for all types of users. We can install it on at least the following operating systems:

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

One of the easiest options I recommend is to use a WAR file. A WAR file can be used with or without a container or web application server. Having Java is a must before we try to use a WAR file for Jenkins, which can be done as follows:

  1. Download the jenkins.war file from https://jenkins.io/ .
  2. Open command prompt in Windows or a terminal in Linux, go to the directory where the jenkins.war file is stored, and execute the following command:

    java - jar jenkins.war

  3. Once Jenkins is fully up and running, as shown in the following screenshot, explore it in the web browser by visiting http://localhost:8080.:

    Installing Jenkins

  4. By default, Jenkins works on port 8080. Execute the following command from the command-line:

    java -jar jenkins.war --httpPort=9999

  5. For HTTPS, use the following...

The Jenkins dashboard

The Jenkins dashboard is a simple and powerful place where we can manage all builds and therefore manage the application delivery pipeline as well. Open http://<localhost or IP address>:8080 from browser. Log in with the user credentials which we created earlier. It will direct us to the dashboard.

Let's understand the dashboard parameters:

  • New Item: It is used to create a new build job, pipeline, or build flow in Jenkins 2:

The Jenkins dashboard

  • Manage Jenkins: It allows a Jenkins 2 administrator to manage plugins, users, security, nodes, credentials, global tool configuration, and so on:

The Jenkins dashboard

  • To know about the existing nodes used for build execution, click on Manage Nodes. The master node entry will be available. It is the node where Jenkins is installed. We can add multiple slave nodes to distribute the load, which we will learn later in this chapter:

The Jenkins dashboard

Now that we have installed Jenkins and become familiar with the Jenkins dashboard, the next step is to configure different tools...

Configuring Java and Maven in Jenkins

In Jenkins 2, the Global Tool Configuration section has been introduced, which is a good move. All major configurations related to external tools, their locations, and automatic installer tools can be made in this section. Earlier, these configurations were part of Configure System, which used to make that page bit cluttered.

Configuring Java

To configure Java, provide a Name and the JAVA_HOME path, or check Install automatically checkbox:

Configuring Java

Configuring Maven

To configure Maven, download the Maven installer from https://maven.apache.org/download.cgi , and extract it to the directory on your Jenkins virtual machine. In the Global Tool Configuration section, provide the Name and MAVEN_HOME path, or check Install automatically checkbox:

Configuring Maven

That's it! Our major configuration for running a simple build is done. Now, let's go to the home page of the Jenkins dashboard to create and configure a build job.

Introduction

We all know what Continuous Integration (CI) is, right? It is the first step in our journey.

 

"The journey of a thousand miles begins with one step."

 
 -- Lao Tzu, the father of Taoism

In simple words, CI is a software engineering practice where each check-in made by a developer is verified by either of the following:

  • Pull mechanism: Executing an automated build at a scheduled time

  • Push mechanism: Executing an automated build when changes are saved in the repository

This step is followed by executing a unit test against the latest changes available in the source code repository.

Jenkins doesn't need the introduction; it is an open source and one the most popular CI tools available in the market. It helps in automating the repetitive task of CI. Jenkins makes the process effective and transparent.

 

"We are what we repeatedly do. Excellence, then, is not an act, but a habit."

 
 -- Aristotle

The next question you may ask is what makes Jenkins so popular. I already gave you one reason...

Installing Jenkins

Jenkins provides us with multiple ways to install it for all types of users. We can install it on at least the following operating systems:

  • Ubuntu/Debian

  • Windows

  • Mac OS X

  • OpenBSD

  • FreeBSD

  • openSUSE

  • Gentoo

  • CentOS/Fedora/Red Hat

One of the easiest options I recommend is to use a WAR file. A WAR file can be used with or without a container or web application server. Having Java is a must before we try to use a WAR file for Jenkins, which can be done as follows:

  1. Download the jenkins.war file from https://jenkins.io/ .

  2. Open command prompt in Windows or a terminal in Linux, go to the directory where the jenkins.war file is stored, and execute the following command:

    java - jar jenkins.war

  3. Once Jenkins is fully up and running, as shown in the following screenshot, explore it in the web browser by visiting http://localhost:8080.:

  4. By default, Jenkins works on port 8080. Execute the following command from the command-line:

    java -jar jenkins.war --httpPort=9999

  5. For HTTPS, use the following...

The Jenkins dashboard

The Jenkins dashboard is a simple and powerful place where we can manage all builds and therefore manage the application delivery pipeline as well. Open http://<localhost or IP address>:8080 from browser. Log in with the user credentials which we created earlier. It will direct us to the dashboard.

Let's understand the dashboard parameters:

  • New Item: It is used to create a new build job, pipeline, or build flow in Jenkins 2:

  • Manage Jenkins: It allows a Jenkins 2 administrator to manage plugins, users, security, nodes, credentials, global tool configuration, and so on:

  • To know about the existing nodes used for build execution, click on Manage Nodes. The master node entry will be available. It is the node where Jenkins is installed. We can add multiple slave nodes to distribute the load, which we will learn later in this chapter:

Now that we have installed Jenkins and become familiar with the Jenkins dashboard, the next step is to configure different tools that...

Configuring Java and Maven in Jenkins

In Jenkins 2, the Global Tool Configuration section has been introduced, which is a good move. All major configurations related to external tools, their locations, and automatic installer tools can be made in this section. Earlier, these configurations were part of Configure System, which used to make that page bit cluttered.

Configuring Java

To configure Java, provide a Name and the JAVA_HOME path, or check Install automatically checkbox:

Configuring Maven

To configure Maven, download the Maven installer from https://maven.apache.org/download.cgi , and extract it to the directory on your Jenkins virtual machine. In the Global Tool Configuration section, provide the Name and MAVEN_HOME path, or check Install automatically checkbox:

That's it! Our major configuration for running a simple build is done. Now, let's go to the home page of the Jenkins dashboard to create and configure a build job.

Creating and configuring a build job for a Java application with Maven

Jenkins builds configured with Maven understands how Maven works and what is required in terms of execution. It uses pom.xml to set up and create package files from the source files.

Now, let's perform steps to create and configure a new build job. Go to the Jenkins dashboard and click on New Item.

Go through all the available options of the types of jobs we can create. In our case, let's create a freestyle project for a demo:

  1. Enter an item name, such as PetClinic, then select Freestyle project. Now click on OK to continue:

  2. Let's verify what this operation does. Go to the Jenkins home directory, and navigate to the jobs directory. We can see that the directory has been created for the newly created job with the same name, as shown in the following screenshot:

Configuring and authenticating source code on GitHub

The next step is to configure a source code repository with the build job. We will use the open source Spring application hosted on GitHub, as explained in the previous chapter:

  1. After that, we will get a URL similar to https://github.com/mitesh51/spring-petclinic .

  2. Create a GitHub account and fork repository from https://github.com/spring-projects/spring-petclinic .

    Tip

    Install Git on a virtual machine using the instructions available in the documentation: Getting Started - Installing Git ( https://git-scm.com/book/en/v2/Getting-Started-Installing-Git ). To download a Windows application navigate to https://git-scm.com/ and click on Downloads for Windows.

  3. Let's generate a new SSH key to use for authentication. Open a terminal on a CentOS virtual machine with Git installed.

  4. Run ssh-keygen -t rsa -b 4096 -C "your_email@example.com", substituting your GitHub e-mail address.

  5. Press Enter when you are prompted with Enter file in which to save the...

Configuring build job

Now that Git authentication is done with, let's configure a PetClinic build job:

  1. Click on the PetClinic build job on the Jenkins dashboard. Then, click on the Configure link. You'll see the following page as shown here:

  2. Under Source Code Management, provide the GitHub URL for the sample Spring project we forked earlier, as shown in the following screenshot:

  3. We will configure Build Triggers and the Build Environment as shown here:

  4. Under Build, click on Add build step and select Invoke top-level Maven targets. Select the Maven Version we configured in Global Tools Configuration. Enter the Maven target and click on Save:

  5. Let's manually trigger the build by clicking on Build Now. After the build is complete, you'll see this:

  6. Click on the build number, the one with the #  symbol. Open Console Output. Verify the Git operations executing before Maven target execution:

  7. Once source code is available in the build job's workspace, the Maven target will be executed and the...

Configuring JUnit

Our sample application has JUnit test cases, and to execute them, we need to configure JUnit-related settings in the build job configuration:

  1. Under Post-build Actions, select Publish JUnit test result report.

  2. Provide a path for Test report XMLs based on the workspace.

  3. Click on Apply and then click on Save:

  4. After you've configured the JUnit settings for the build, wait for a scheduled build execution, or click on Build Now.

  5. Verify the build status on the Jenkins dashboard and you will see the Test Result link with a small summary. Click on Test Result:

  6. Verify all test execution statuses package wise. The page also provides information related to duration and failed test cases:

In the next section, we will cover the Dashboard View plugin, which helps us customize the view for build jobs.

The Dashboard View plugin - overview and usage

Dashboard View plugin provides a different view implementation, based on a portal kind of layout. We can select different build jobs to be included in a new view and configure different portlets for the view.

To configure it, follow these steps:

  1. Go to Plugin Manager from Manage Jenkins, and click on the Available tab. Search for the Dashboard View plugin and click on Install without restart:

  2. Once the plugin has been installed successfully, we can create a new view by clicking on the + sign on the Jenkins dashboard.

  3. Enter a View name, select the view type, and click on OK:

  4. Click on Edit and configure Dashboard Portlets for the top, left column, right column, and bottom. We can use different portlets, such as Test Statistics Chart, and Trends:

  5. Add different portlets based on your requirements into the view, and save it. Here's a sample view:

  6. After we run the build job, we can find a test result chart on the build job's dashboard as well:

Now...

Managing nodes

Jenkins provides a master-slave concept for managing the aforementioned scenarios. We can assign different build jobs to different slaves in the build configuration and use the master-slave system to manage its overall lifecycle. The master node itself can execute the build if a slave node is not configured explicitly in the build job configuration.

There are quite a few reasons for using this feature:

  • Build jobs require resources, and they compete for resource availability

  • A different runtime environment is required for different build jobs

  • It distributes the load across slave nodes

To make things clearer, we need not install Jenkins on the slave nodes. We only need to configure the slave nodes properly, which we will now cover.

The only requirements are the following:

  • The configurations and runtime environment have to be available on the slave node

  • The path needs to be configured correctly on the master node for the runtime environments or tools used by the slave node for execution...

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Key benefits

  • Overcome the challenges of implementing DevOps for web applications, familiarize yourself with diverse third-party modules, and learn how to integrate them with bespoke code to efficiently complete tasks
  • Understand how to deploy web applications for a variety of Cloud platforms such as Amazon EC2, AWS Elastic Beanstalk, Microsoft Azure, Azure Web Apps, and Docker Container
  • Understand how to monitor applications deployed in Amazon EC2, AWS Elastic Beanstalk, Microsoft Azure, Azure Web Apps using Nagios, New Relic, Microsoft Azure, and AWS default monitoring features

Description

The DevOps culture is growing at a massive rate, as many organizations are adopting it. However, implementing it for web applications is one of the biggest challenges experienced by many developers and admins, which this book will help you overcome using various tools, such as Chef, Docker, and Jenkins. On the basis of the functionality of these tools, the book is divided into three parts. The first part shows you how to use Jenkins 2.0 for Continuous Integration of a sample JEE application. The second part explains the Chef configuration management tool, and provides an overview of Docker containers, resource provisioning in cloud environments using Chef, and Configuration Management in a cloud environment. The third part explores Continuous Delivery and Continuous Deployment in AWS, Microsoft Azure, and Docker, all using Jenkins 2.0. This book combines the skills of both web application deployment and system configuration as each chapter contains one or more practical hands-on projects. You will be exposed to real-world project scenarios that are progressively presented from easy to complex solutions. We will teach you concepts such as hosting web applications, configuring a runtime environment, monitoring and hosting on various cloud platforms, and managing them. This book will show you how to essentially host and manage web applications along with Continuous Integration, Cloud Computing, Configuration Management, Continuous Monitoring, Continuous Delivery, and Deployment.

Who is this book for?

If you are a system admin or application and web application developer with a basic knowledge of programming and want to get hands-on with tools such as Jenkins 2 and Chef, and Cloud platforms such as AWS and Microsoft Azure, Docker, New Relic, Nagios, and their modules to host, deploy, monitor, and manage their web applications, then this book is for you.

What you will learn

  • Grasp Continuous Integration for a JEE application—create and configure a build job for a Java application with Maven and with Jenkins 2.0
  • Create built-in delivery pipelines of Jenkins 2 and build a pipeline configuration for end-to-end automation to manage the lifecycle of Continuous Integration
  • Get to know all about configuration management using Chef to create a runtime environment
  • Perform instance provisioning in AWS and Microsoft Azure and manage virtual machines on different cloud platforms—install Knife plugins for Amazon EC2 and Microsoft Azure
  • Deploy an application in Amazon EC2, AWS Elastic Beanstalk, Microsoft Azure Web Apps, and a Docker container
  • Monitor infrastructure, application servers, web servers, and applications with the use of open source monitoring solutions and New Relic
  • Orchestrate multiple build jobs to achieve application deployment automation—create parameterized build jobs for end-to-end automation
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Publication date : Oct 24, 2016
Length: 408 pages
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Language : English
ISBN-13 : 9781786465702
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Languages :
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Concepts :
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Length: 408 pages
Edition : 1st
Language : English
ISBN-13 : 9781786465702
Category :
Cloud & Networking
Languages :
Java
Concepts :
DevOps
Tools :
Jenkins

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Table of Contents

9 Chapters
1. Getting Started – DevOps Concepts, Tools, and Technologies Chevron down icon Chevron up icon
1. Getting Started – DevOps Concepts, Tools, and Technologies
Understanding the DevOps movement
The DevOps lifecycle - it's all about "continuous"
Tools and technologies
An overview of a sample Java EE application
Self-test questions
Summary
2. Continuous Integration with Jenkins 2 Chevron down icon Chevron up icon
2. Continuous Integration with Jenkins 2
Introduction
Installing Jenkins
The Jenkins dashboard
Configuring Java and Maven in Jenkins
Creating and configuring a build job for a Java application with Maven
Configuring and authenticating source code on GitHub
Configuring build job
Configuring JUnit
The Dashboard View plugin - overview and usage
Managing nodes
Sending e-mail notifications based on build status
Integrating Jenkins and Sonar
Self-test questions
Summary
3. Building the Code and Configuring the Build Pipeline Chevron down icon Chevron up icon
3. Building the Code and Configuring the Build Pipeline
Creating built-in delivery pipelines
Creating a pipeline for compiling and executing test units
Using the Build Pipeline plugin
Integrating the deployment operation
Self-test questions
Summary
4. Installing and Configuring Chef Chevron down icon Chevron up icon
4. Installing and Configuring Chef
Getting started with Chef
Overview of hosted Chef
Installing and configuring a Chef workstation
Converging a Chef node using a Chef workstation
Installing software packages using cookbooks
Creating a role
Self-test questions
Summary
5. Installing and Configuring Docker Chevron down icon Chevron up icon
5. Installing and Configuring Docker
Overview of Docker containers
Understanding the difference between virtual machines and containers
Installing and configuring Docker on CentOS
Creating your first Docker container
Understanding the client-server architecture of Docker
Managing containers
Creating a Docker image from Dockerfile
Self-test questions
Summary
6. Cloud Provisioning and Configuration Management with Chef Chevron down icon Chevron up icon
6. Cloud Provisioning and Configuration Management with Chef
Chef and cloud provisioning
Installing knife plugins for Amazon Web Services and Microsoft Azure
Creating and configuring a virtual machine in Amazon EC2
Creating and configuring a virtual machine in Microsoft Azure
Docker containers
Self-test questions
Summary
7. Deploying Application in AWS, Azure, and Docker Chevron down icon Chevron up icon
7. Deploying Application in AWS, Azure, and Docker
Prerequisites – deploying our application on Remote Server
Deploying application in Docker container
Deploying Application in AWS
Deploying application in Microsoft Azure
Self-test questions
Summary
8. Monitoring Infrastructure and Applications Chevron down icon Chevron up icon
8. Monitoring Infrastructure and Applications
Getting started – monitoring
Overview of Monitoring tools and Techniques
Monitoring AWS Elastic Beanstalk
Monitoring Microsoft Azure Web App Service
Self-test questions
Summary
9. Orchestrating Application Deployment Chevron down icon Chevron up icon
9. Orchestrating Application Deployment
Creating build jobs for end-to-end automation
Configuring SSH authentication using a key
Configuring the build pipeline for build job orchestration
Executing the pipeline for application deployment automation
Hygieia – a DevOps dashboard
Self-test questions
Summary

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Apoorva Shetty May 02, 2017
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Amazing book.. covers almost all concepts with added screenshots for clarity!Was a delight learning DevOps with the help of this book. Great work!
Amazon Verified review Amazon
MITESH H SHAH May 05, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
amazing book. Its wonderful to get knowledge abt DevOps in such easy and practical terms... Thank u so much
Amazon Verified review Amazon
Amazon Customer Jun 15, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent book. Most of the dev ops topics are covered.
Amazon Verified review Amazon
Resident01 Jun 07, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is a fantastic book for learning how to use all of the common dev ops tools. It's very well written and doesn't go too fast or too slow for uptake. The first chapter pretty much rushes you into the basics of what you'll be covering and then begins detailed explanations and setup steps to make it work. Me and DevOps generally don't get along and this book has been great.
Amazon Verified review Amazon
Ramarao Feb 06, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
It's good for Devops beginner.
Amazon Verified review Amazon

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About the author

Profile icon Mitesh Soni
Mitesh Soni
Mitesh Soni has 8 years of experience in managing software for GNU/Linux and other UNIX-like operating systems in production environment. He started working as a professional with DevOps from 2013 and has worked on several live projects related to DevOps. https://www.linkedin.com/in/alessiogarofalo
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