Jenkins Interview Answers:

Q1) What is Jenkins?

Answer: 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.

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Q2) Requirements for the use of Jenkins?

Answer: 

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

Q3) Commands used for starting Jenkins manually?

Answer: We can use the following commands to start manually:

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

Q4) Plugins that are mostly used for Jenkins?

Answer: Useful plugins for Jenkins:

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

Q5) How to copy, move Jenkins from one to another server?

Answer:

• 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.

Q6) Jenkins is integrated with 2 components what are they?

Answer: 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.

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Q7) Notify the difference between Jenkins, Maven & ant?

Answer: Jenkins is an open-source continuous integration tool whereas ant & maven are Build technologies. Steps to setup Jenkins jobs? Step by step procedure:

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

Q8) Tool used for configuration & provisioning?

Answer: 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.

Q9) Minimum JRE required for a run of Jenkin 2.1?

Answer: JRE8 or Else JDK8