What are the common use cases Jenkins is used for?
Jenkins being open-source automation can be used for any kind of software-based automation. Some of the common use-cases include but not limited to -

Software build jobs
Sanity/Smoke/CI/Regression test jobs
Web/Data Scraping related jobs
Code coverage measurement jobs
General-purpose automation
Reverse Engineering jobs
Key Decoding jobs & many other jobs where software automation will be applicable.

Tell me something about Continuous Integration, Continuous Delivery, and Continuous Deployment?
Continuous Integration: A software development process where the changes made to software are integrated into the main code as and when a patch is ready so that the software will be always ready to be - built, tested, deployed, monitored - continuously.

Continuous Delivery: This is a Software Development Process where the continuously integrated (CI) changes will be tested & deployed continuously into a specific environment, generally through a manual release process, after all the quality checks are successful

Continuous Deployment: A Software Development practice where the continuously integrated (CI) changes are deployed automatically into the target environment after all the quality checks are successful

Kubectl Basic Commands
Kubectl get
$ kubectl get namespaces
$ kubectl get nodes
$ kubectl get pods
$ kubectl get pods --namespace jenkins

Kubectl describe
$ kubectl describe ns jenkins
$ kubectl describe pods jenkins-7fc688c874-mh7gv --namespace jenkins
$ kubectl describe node minikube

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How do you store credentials in Jenkins securely?
Credentials can be stored securely in Jenkins using the Credentials plugin, which stores different types of credentials like - Username with a password, SSH username with the private key, AWS Credentials, Jenkins Build Token, Secret File/Text, X509 & other certificates, Vault related credentials securely with proper encryption & decryption as and when required.
How can we stop a scheduled job from being executed temporarily?
Disable the job from the job details page to temporarily stop all scheduled executions & other factors/events from triggering the job and enable it back to resume the job schedules/triggers. If a job is not required permanently, we can delete the job from the jobs list view page.

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What are the ways to trigger a Jenkins Job/Pipeline?
There are many ways we can trigger a job in Jenkins. Some of the common ways are as below -

Trigger an API (POST) request to the target job URL with the required data.
Trigger it manually from the Jenkins web application.
Trigger it using Jenkins CLI from the master/slave nodes.
Time-based Scheduled Triggers like a cron job.
Event-based Triggers like SCM Actions (Git Commit, Pull Requests), WebHooks, etc.
Upstream/Downstream triggers by other Jenkins jobs.

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What is Jenkins Build Cause?
Build Cause is a text attribute that represents what made a job's build to be triggered, say it could be a Jenkins User (from UI), Timer for Scheduled jobs, Upstream jobs for a job which was triggered by upstream job, etc. This is mainly used to identify the nature of the builds - be it nightly, manual, automated, etc.

How Jenkins knows when to execute a Scheduled job/pipeline and how it is triggered?
Jenkins master will have the cron entries set up for the jobs as per the scheduled Job's configurations. As and when the time for a particular job comes, it commands agents (based on the configuration of the job) to execute the job with required configurations.

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WHAT ARE THE WAYS TO TRIGGER A JENKINS JOB/PIPELINE?
There are many ways we can trigger a job in Jenkins. Some of the common ways are as below -

Trigger an API (POST) request to the target job URL with the required data.
Trigger it manually from the Jenkins web application.
Trigger it using Jenkins CLI from the master/slave nodes.
Time-based Scheduled Triggers like a cron job.
Event-based Triggers like SCM Actions (Git Commit, Pull Requests), WebHooks, etc.
Upstream/Downstream triggers by other Jenkins jobs.

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