21 October 2020

#Jenkins

#Jenkins

Key Concepts


S.No Topic Sub-Topics
1 Introduction to Jenkins What is Jenkins?, Features, Benefits, Use cases, CI/CD overview
2 Jenkins Architecture Master node, Slave nodes, Build executor, Plugins, Distributed builds
3 Installation & Setup System requirements, Installation steps, WAR file, Docker setup, Plugins installation
4 Jenkins Dashboard Overview UI navigation, Jobs overview, Build history, Manage Jenkins, Dashboard widgets
5 Jobs & Projects Freestyle project, Pipeline project, Multibranch pipeline, Matrix project, Job configuration
6 Build Triggers Poll SCM, Scheduled builds, Webhooks, Remote triggers, Manual triggers
7 Source Code Management Git integration, SVN integration, Branch handling, Credentials, Repository polling
8 Pipeline Basics Pipeline syntax, Declarative pipeline, Scripted pipeline, Stages, Steps
9 Pipeline DSL Groovy basics, Pipeline syntax, Stages, Steps, Scripted vs Declarative
10 Jenkins Plugins Plugin installation, Popular plugins, Plugin management, Compatibility, Updates
11 Build Artifacts Archiving, Storing, Retrieving artifacts, Artifact repositories, Versioning
12 Environment Variables Global variables, Build variables, Injected variables, Usage in pipeline, Security
13 Credentials Management Adding credentials, Secret text, SSH keys, Passwords, Usage in jobs
14 Distributed Builds Master-slave setup, Node configuration, Labeling, Job allocation, Scalability
15 Parallel Execution Parallel stages, Node blocks, Matrix builds, Optimization, Limitations
16 Post-build Actions Email notifications, Deploy artifacts, Trigger downstream jobs, Cleanup, Reports
17 Build Pipelines Integration CI/CD pipeline, GitHub Actions, Bitbucket, Docker integration, Kubernetes integration
18 Parameterized Builds String parameters, Choice parameters, Boolean parameters, Multi-line, File parameters
19 SCM Polling & Webhooks Git polling, SVN polling, Webhooks setup, Triggering builds, Best practices
20 Error Handling & Notifications Build failure handling, Email notifications, Slack integration, Retry builds, Logging
21 Testing Integration Unit testing, Integration testing, Test reporting, JUnit, SonarQube
22 Docker & Jenkins Docker plugin, Build Docker images, Run containers, Docker-compose integration, Best practices
23 Kubernetes & Jenkins Deploy pipelines, Jenkins X, Agents in Kubernetes, Scaling, Monitoring
24 Artifact Repository Integration Nexus, Artifactory, Storing builds, Versioning, Publishing
25 Security Best Practices User roles, Access control, API tokens, Secure pipelines, Secrets management
26 Backup & Restore Configuration backup, Jobs backup, Plugins backup, Restore process, Disaster recovery
27 Monitoring & Logging System logs, Build logs, Monitoring plugins, Dashboard, Alerts
28 Performance Optimization Concurrent builds, Job optimization, Agent allocation, Pipeline tuning, Resource management
29 Hands-on Projects CI/CD pipeline setup, GitHub integration, Docker build automation, Multi-branch pipeline, Automated testing pipeline
30 Certification & Career Path Jenkins certification, DevOps roles, Learning resources, Portfolio projects, Career opportunities

Interview question

📘 Basic Level

  1. What is Jenkins, and why is it used?
  2. Who developed Jenkins, and what was its earlier name?
  3. What are the main features of Jenkins?
  4. What is a Jenkins job?
  5. What is a Jenkins pipeline?
  6. Explain the difference between Freestyle and Pipeline jobs.
  7. How do you install Jenkins?
  8. What are Jenkins plugins?
  9. How do you start/stop Jenkins service?
  10. What is the default Jenkins home directory?
  11. How do you secure Jenkins with a password?
  12. What are Jenkins nodes (master/agent)?
  13. How do you configure a Jenkins agent?
  14. What is the purpose of Jenkinsfile?
  15. What is Continuous Integration (CI)?
  16. What is Continuous Delivery (CD)?
  17. How do you integrate Jenkins with Git?
  18. How do you schedule a build in Jenkins?
  19. What are build triggers in Jenkins?
  20. Explain the concept of ?upstream? and ?downstream? jobs.
  21. What is the use of Jenkins artifacts?
  22. How do you install a plugin in Jenkins?
  23. How do you disable a Jenkins job temporarily?
  24. What is the difference between Jenkins and other CI/CD tools?
  25. What are common use cases of Jenkins?

📗 Intermediate Level

  1. How do you set up Jenkins on Docker?
  2. What are Jenkins environment variables?
  3. Explain parameterized jobs in Jenkins.
  4. How do you configure Jenkins with GitHub Webhooks?
  5. How do you configure email notifications in Jenkins?
  6. What is the difference between Declarative and Scripted pipelines?
  7. How do you create a pipeline using Jenkinsfile?
  8. Explain the purpose of the Jenkinsfile stages block.
  9. How do you pass parameters between stages in Jenkins pipeline?
  10. What are shared libraries in Jenkins?
  11. How do you manage Jenkins credentials?
  12. Explain Jenkins Blue Ocean.
  13. How do you back up and restore Jenkins?
  14. What is Jenkins Job DSL?
  15. How do you integrate Jenkins with Maven?
  16. How do you integrate Jenkins with Docker?
  17. How do you integrate Jenkins with Kubernetes?
  18. What is Jenkins Multibranch Pipeline?
  19. How do you configure Jenkins to run parallel builds?
  20. How do you configure Jenkins to trigger builds on code commit?
  21. How do you configure Jenkins security (RBAC)?
  22. What is Jenkins Pipeline as Code?
  23. How do you view console output of a Jenkins job?
  24. What is the difference between node and agent in Jenkins pipeline?
  25. How do you archive artifacts in Jenkins?

📕 Advanced Level

  1. How do you set up Jenkins in High Availability mode?
  2. What is Jenkins distributed build architecture?
  3. How do you scale Jenkins for enterprise-level workloads?
  4. What are Jenkins fingerprints?
  5. How do you configure Jenkins with LDAP authentication?
  6. What is the difference between Jenkins scripted pipeline and Groovy scripts?
  7. Explain how Jenkins integrates with Ansible.
  8. How do you implement pipeline stages for Dev, QA, and Prod?
  9. How do you create a Jenkins pipeline to deploy a Docker container?
  10. What are post actions in Jenkins pipeline?
  11. Explain the difference between agent any and agent none in Jenkins pipeline.
  12. How do you use when conditions in Jenkins pipeline?
  13. What are some best practices for Jenkins pipeline design?
  14. How do you monitor Jenkins performance?
  15. How do you secure secrets in Jenkins pipeline?
  16. What is the difference between Jenkins freestyle job and pipeline-as-code approach?
  17. How do you configure Jenkins for artifact promotion?
  18. How do you integrate Jenkins with SonarQube?
  19. How do you integrate Jenkins with Nexus or JFrog Artifactory?
  20. How do you integrate Jenkins with Terraform?
  21. How do you troubleshoot a failed Jenkins job?
  22. How do you configure retry logic in Jenkins pipeline?
  23. What are scripted steps vs declarative steps in Jenkins pipeline?
  24. How do you use Jenkins matrix jobs?
  25. How do you configure Jenkins to run on Kubernetes pods dynamically?

📓 Expert Level

  1. How do you design a scalable Jenkins architecture for 1000+ developers?
  2. How do you optimize Jenkins for thousands of builds per day?
  3. How do you configure Jenkins shared libraries across multiple teams?
  4. Explain the internals of Jenkins pipeline execution engine.
  5. How do you implement GitOps workflows with Jenkins?
  6. How do you configure Jenkins with service mesh (Istio/Linkerd)?
  7. How do you integrate Jenkins with advanced observability tools (Prometheus, Grafana)?
  8. How do you migrate from Jenkins freestyle jobs to pipeline jobs?
  9. How do you implement multi-region CI/CD with Jenkins?
  10. How do you secure Jenkins REST API?
  11. Explain Jenkins integration with HashiCorp Vault.
  12. How do you debug Groovy scripts in Jenkins pipeline?
  13. How do you implement chaos testing in Jenkins pipelines?
  14. How do you optimize Jenkins pipelines for microservices deployments?
  15. How do you integrate Jenkins with cloud providers (AWS, Azure, GCP)?
  16. How do you implement Jenkins pipeline for Infrastructure as Code (IaC)?
  17. How do you handle secrets management in Jenkins with Kubernetes?
  18. How do you perform Canary/Blue-Green deployments with Jenkins?
  19. How do you secure Jenkins against supply chain attacks?
  20. What are some challenges with Jenkins in large organizations?
  21. How do you integrate Jenkins with AI/ML workflows?
  22. What are advanced caching strategies in Jenkins builds?
  23. How do you configure Jenkins to run pipelines with parallel test suites?
  24. How do you migrate from Jenkins to GitHub Actions/GitLab CI/CD?
  25. What is the future of Jenkins in the DevOps ecosystem?

Related Topics


   Jenkins Architecture   
   Jobs & Projects   
   Pipeline Basics   
   Credentials Management   
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