These are the top Jenkins interview questions asked in top organizations that will help you land in your dream job. Here, you will learn how to configure and use third-party tools in Jenkins, backing up Jenkins build jobs, Jenkins pipeline, requirements for using Jenkins, and more. Learn Jenkins from Intellipaat's DevOps Course and fast-track your career!
First, let us compare Jenkins with TeamCity:
The software prerequisites for installing Jenkins are that first we need to install Java Development Kit. We also need to install the Jakarta Enterprise Edition. Jenkins also comes with an embedded Jetty Runtime that can be used if WebSphere or Tomcat is not available.
These are the steps used for working with a third-party tool in Jenkins:
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These are the mechanisms for starting a Jenkins node agent:
When we launch a Jenkins node agent, it will download a JNLP file. A new process is launched on the client machine by the JNLP when it runs.
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Within the XML configuration, each Jenkins build is stored. When this folder is copied, the configuration of all the build jobs that are managed by the Jenkins master is backed up. If we can perform a Jenkins Git integration, then it is good. When we copy the contents of the folder, we will see that the build jobs described in the folder will be restored when the Jenkins server is started the next time.
A complete Jenkins pipeline includes building a project from the source code, putting it through a variety of units, integrating, testing for user acceptance and performance, and then finally deploying the packaged application on an application server.
So, the steps in a Jenkins pipeline can be listed as below:
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There is a folder that contains a file named config.xml. We need to change the settings to false for the security to be disabled when Jenkins is started the next time.
Jenkins can be thought of as an open-source automation tool that is used for continuous integration. With Jenkins, we will be able to continuously test our software projects so that developers will be able to integrate the changes to the project. We can also integrate this automation tool with a large number of testing and deployment technologies.
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Here are some of the most important advantages of Jenkins:
Some of the requirements for using Jenkins are as follows:
Some of the important plugins that are used with Jenkins are:
First, we need to create a Jenkins job by going to the Jenkins top page and then selecting a ‘New Job’ and building a freestyle software project.
Some of the elements of a freestyle project include the following:
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If we want to create a backup for our file, then we need to regularly backup our Jenkins_Home directory. This will include all the build jobs configuration, all the slave node configuration, and the build history. If we want to create a Jenkins backup, we can copy a job directory to a clone or can rename the directory.
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First, we need to ensure global security. Then, we have to make sure that Jenkins is integrated with the user directory through an appropriate plugin. The project matrix is enabled for fine tuning the access using the custom version-controlled script for automating the process of rights and privileges in Jenkins. The access to Jenkins data or folder is limited. We will run security audits on it.
Initially, Jenkins was called Hudson. However, there were some issues, and due to this the name was changed from Hudson to Jenkins.
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First, we need to open the console output where the broken build is created and then see if there are any file changes that were missed. If we do not find any issues in this manner, then we can update our local workspace and replicate the problem and then try to solve it.
First, we need to copy our jobs directory from the old to the new server. There are multiple ways to do it. We can either move the job from the installation by simply copying the corresponding job directory or we can make a clone of the job directory by making an existing job’s copy. For this, we need to have a different name, which we can rename later.
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Some steps for scheduling builds in Jenkins are as follows:
Some of the important SCM tools that are supported by Jenkins include:
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