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Intro to CI (Continuous integration) - Jenkins

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                                 Continuous integration is a process to integrate development work and Testing to identify the development errors as early as possible to achieve rapid application delivery throughout the software application lifecycle.

 The Jenkins Over-View:
                                        Jenkins is one open source tool to perform continuous integration. The basic functionality of Jenkins is to execute a predefined list of steps based on a certain trigger. For example the trigger might be a time based trigger or conditional trigger or etc.

                             Builds can be started by various means, including being triggered by commit in a version control system, by scheduling via a cron-like  mechanism, by building when other builds have completed, and by requesting a specific build URL.

Eg - execute build every 30 minutes.

The basic list of steps:
  • perform a software build with Apache Maven or Gradle
  • Run a shell script
  • Archive the build result
  • Afterwards start the integration tests
Jenkins also monitors the execution of the steps and allows to stop the process if one of the steps fails. Jenkins allows to notify users about the build success or failure.

Installation Process:

The Jenkins can be downloaded from below URL:

http://mirrors.jenkins-ci.org/war/latest/jenkins.war

                                                         Jenkins can be started via the command line or can run in a web application server. Under Windows/Linux you can also install Jenkins as a system service.

                                         To run Jenkins, you need the Java Runtime Environment (JRE) 1.7 or later. After you download jenkins.war from above metioned URL.

you can launch it by executing java -jar jenkins.war from the Command Prompt

                                       Alternatively, if you have a servlet container that supports Servlet 2.4/JSP 2.0 or later, such as Glassfish, Tomcat 5, JBoss, Jetty 6, etc, then you can deploy jenkins.war as you would any WAR file. See this document for more about container-specific installation instruction.
                                        Once the war file is exploded, run chmod 755 jenkins in the exploded jenkins/WEB-INF directory so that you can execute this shell script.
                                       If you're running on Windows you might want to run Jenkins as a service so it starts up automatically without requiring a user to log in. The easiest way to achieve this is to simply download and install Jenkins via the native Windows installer, which can be found on the Jenkins Main Page. Just download the .zip file, unpack it, and click through the install wizard. The wizard both installs Jenkins and sets up the Jenkins Windows service for you.
                                         Another way to run Jenkins as a service is to first install Tomcat as a service and then deploy Jenkins to it in the usual way. Another way is to use the Java Service Wrapper. However, there may be problems using the service wrapper, because the Main class in Jenkins in the default namespace conflicts with the service wrapper main class. Deploying inside a service container (Tomcat, Jetty, etc.) is probably more straightforward, even for developers without experience with such containers.
                                           Also, see how other people are deploying Jenkins to get some idea of how to make it fit your environment.

Once the Installation is done in your local host Please navigate to the below URL:

http://Localhost:8080

        To see Jenkins, simply bring up a web browser and go to URL http://myServer:8080 where myServer is the name of the system running Jenkins.

                   Jenkins at first startup




Source:  https://wiki.jenkins-ci.org/display/JENKINS/Meet+Jenkins
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