Jenkins with Github

In this article we will see how we can configure Jenkins with Github. Our goal is to make Jenkins pull code from the Github repository and build that code locally.

1) The basic steps are to configure the Github with a repository and push some code. Use the articles from the Git.

2) Once the code is pushed to the Github, we need to then make configuration changes on the Jenkins side so that jenkins can pull the code from the Github repository and build the code locally

3) Git hub provides some thing called as the hooks which allows the communication. The post-receive hook of Github are actually only "WebHooks", to communicate with a web server whenever the repository is pushed to.

First lets see the changes that need to be done from the GitHub side

1) Click on the Settings of the repository in Github. Then go to the Webhooks and Services. 

2) In the service , search for Jenkins for Github service and choose

 Now once you choose the service ,you need to enter the locally run jenkins details in the jenkins hook url as above.

Make sure you get you IP address ( using ifconfig command in linux) and configure the URL as

http://<IP address>:<Port>/github-webhook/

the next step is click on the "Test Service" which will return a payload. If the payload was success, then the configuration test is fine.

2) Configurations need to be done on Jenkins. Once the Configuration on the Github side is done, we need to make some configuration changes on the Jenkins side to connect to the Github and get the source code for building

Choose a New Item from Jenkins for building the Code. Go for the project type if that is maven and click Ok . in the next screen configure the GitHub repository details as shown in the screen shot, 

Provide the Github repository details in the Github project URL for the Build Item. Also provide the Github credentials if needed to connect.

In the below part of the same screen , choose the "Poll SCM" check box and add " H/5 * * * *" which will poll the source code for every 5 minutes and build the code.

Jenkins does provide a options to build when a Push to the Github from the local Git is done but Since your jenkins is not accessible from a public IP address, GitHub can not trigger the build via WebHook

So we use the Poll mechanism to poll code for every 5 minutes from Github and build the code. Once the Poll is done we see some thing like this

More to Come,Happy Learning