Jenkins Interview Questions

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Advanced

Below are the steps to deploy a custom build of a core plugin:

  •  Stop Jenkins.
  •  Copy the custom HPI to $Jenkins_Home/plugins.
  •  Delete the previously expanded plugin directory.
  •  Make an empty file called <plugin>.hpi.pinned.
  •  Start Jenkins. 

The Jenkins Job DSL Plugin is basically the Domain Specific Language (DSL) plugin that allows users to describe jobs using a scripting language named Groovy, the plugin can manage the scripts and updating of the Jenkins jobs which are created and maintain them as a result.

CI (Continuous integration)

Continuous Integration is a process that helps developers to integrate code into a shared repository several times. Each check-in is verified by an automated build process, allowing teams to detect problems early. 

CD (Continuous delivery)

Continuous delivery is an extension of a continuous integration process which helps to make sure that new changes can be released to the customers quickly in a sustainable way.

With the help of input directives, the user could prompt the inputs with the help of input steps. The stage is paused after different options have been applied and before we can enter to the stage agent to evaluate its condition. Once the input is approved, we could continue with the stage ahead. The parameters that are given as the part of input submission will be available in the environment for the rest of the stage.

The scripted pipeline is very much similar to the declarative pipeline that's built on the top of the underlying pipeline sub-system. The scripted pipeline is based on a general-purpose language based on Groovy. A list of features or benefits that are available in Groovy can be used along scripted pipeline too. In brief, this is a highly flexible tool that can be used in multiple continuous delivery pipelines.

Blue Ocean is a project that rethinks the user experience of Jenkins, modeling and presenting the process of software delivery by surfacing information that’s important to development teams with as few clicks as possible, while still staying true to the extensibility that is core to Jenkins. While this project is in the alpha stage of development, the intent is that Jenkins users can install Blue Ocean side-by-side with the Jenkins Classic UI via a plugin.

Beginner

The user needs to open the console output for the build and will try to see if any file changes that were missed during building the project. If there are no issues on that then a better approach would be clean and update his local workspace to replicate the problem on their local machine and will try to solve it.

To make sure Jenkins build is not broken at all we need to make sure that we perform a successful clean install on the local machine with all unit tests. Then make sure that all code changes are checked in without any issues. Then synchronize with a repository to make sure that all required config and changes and any differences are checked into the repository. 

The below are the ways of scheduling build in Jenkins

  • Builds can be triggered by source code management commits.
  • Builds can be triggered sequentially after completion of other builds.
  • Can be scheduled to run at a specified time using the CRON jobs
  • Manual Build Requests.

Please follow the below steps,

  • Slide a job from one installation of Jenkins to another by copying the related job directory
  • Make a copy of an already existing job by making a clone of a job directory by a different name
  • Renaming an existing job by renaming a directory.

The role-based strategy plugin allows us to create three different types of roles as describes below,

  •  Global Roles: Some of the roles such as admin, job creator, anonymous can be created while selecting this option. The user can allow setting Overall, slave, job, and View and SCM permissions on a global basis.
  •  Project roles: This job is basically to allow the creation of Job and Run permissions on a project basis.
  •  Slave roles: This job is only to set node-related permissions.

Creating a chain of jobs in Jenkins is the process of automatically starting the sequential job after one job is executed successfully. This approach lets the user build multi-step build pipelines or trigger the rebuild of a project if one of the Project dependencies is updated.

A Jenkins file is a text file that contains the definition of a Jenkins Pipeline and it is generally checked into source control. 

  • Audit trail for the Pipeline can be monitored
  • It serves as a single source of truth for the Pipeline, which can be viewed and edited by multiple members of the project.

Jenkins supports a wide range of Source Code Management tools and few of them are mentioned below,

  • AccuRev
  • CVS
  • Subversion
  • Git
  • Mercurial
  • Perforce
  • Clearcase
  • RTC

The environment directive specifies a sequence of key-value pairs which will be defined as environment variables for the all steps, or stage-specific steps, depending on where the environment directive is located within the Pipeline. This directive supports a special helper method credentials() which can be used to access pre-defined Credentials by their identifier in the Jenkins environment.

A stage block defines a conceptually distinct subset of tasks performed through the entire Pipeline. Stages contain a sequence of one or more stage directives, the stages section is where the bulk of the "work" described by a Pipeline will be located. Minimum, it is recommended that stages contain at least one stage directive for each discrete part of the continuous delivery process, such as Build, Test, and Deploy.

Jenkins is an open source automation server written in Java. As an extensible automation server, Jenkins can be used as a simple CI server or turned into the continuous delivery hub for any project.

Impress Employers with your Jenkins knowledge

So, this is all about the best interview questions and answers on Jenkins. I hope these Jenkins interview questions help you crack your interview.

Prepare yourself with the best interview questions and answers on Jenkins to land your dream job!

Description

Jenkins, a very important tool in DevOps that automates the rest of the process with the help of plugins once the changes are made in a source code repository (SCR). If you are applying for any DevOps role or any Cloud-native practitioner role, you can encounter many Jenkins interview questions. 
Following are the most frequently asked interview questions and answers on Jenkins. These interview questions on Jenkins can be useful for freshers and experienced to clear the interview. 
When any organization seeking to fill the vacancies for the DevOps roles, they mostly look for the following set of skills in an individual and these are:
An individual should be fluent in web languages like Ruby, Python, PHP or Java.
An individual should be aware of the various infrastructure automation tools like Chef, Puppet, Ansible, SaltStack or Windows PowerShell DSC.
Interpersonal skills that help you communicate and collaborate across teams and roles.
This skills-set will make you eligible for the interview. Jenkins basic interview questions and answers mentioned here will help you to prepare for the interview. Here is a list of the top Jenkins interview questions and answers.  
 

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