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Jenkins Interview Questions and Answers

What is Jenkins?
Jenkins is an open-source continuous integration tool. The functionality of Jenkins is to keep track of version control system & initiate, monitor build system if changes occur.

SCM tools supported by Jenkins?
It supports the following tools:

  • ClearCase.
  • Perforce.
  • Git.
  • RTC.
  • AccuRev.
  • Subversion.

Requirements for the use of Jenkins?

  • Source code repository which can be accessible, Git repository, instance.
  • Script already working & built e.g maven script.

Commands used for starting Jenkins manually?
We can use the following commands to start manually:

(jenkins_url)/safeRestart.
(jenkins_url)/restart.

Plugins that are mostly used for Jenkins?
Useful plugins for Jenkins:

  • HTML publisher.
  • Join.
  • Maven2 project.
  • Copy artifact.
  • Amazon EC2.

How to copy, move Jenkins from one to another server?

  • By making a clone of a job directory with a different name you can copy Jenkins.
  • By renaming the existing job via renaming a directory could be done.
  • Copy the linked job directory & slide job from one to another installation.

Jenkins is integrated with 2 components what are they?

The 2 components are:
Tools like apache maven & SVN, GIT(version control systems).

Advantages of Jenkins?
Following are the advantages of Jenkins:

  • At integration stage, build failures are cached.
  • Maven release projects are automated by using simple steps.
  • Plugin support is in large scale.
  • At an early stage, bugs can be identified in the development environment.
  • The code is improved iteratively.

Notify the difference between Jenkins, Maven & ant?
Jenkins is an open-source continuous integration tool whereas ant & maven are Build technologies.

Steps to setup Jenkins jobs?

Step by step procedure:

  1. Select item forms the menu.
  2. Enter the name of the job → free-style job.
  3. Press OK to continue & create a new job in Jenkins.
  4. Configure you jon in the next page.

Tool used for configuration & provisioning?
Ansible-It is an agent with less config management as well orchestration tool. The configuration modules are called ‘Playbooks’. Ansible can be used for more of cloud provisioning.

Minimum JRE required for a run of Jenkin 2.1?

JRE8 or Else JDK8

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