21 October 2020

#Jenkins

#Jenkins

Key Concepts


Topic Sub-Topics (comma separated) Basic Intermediate Advanced Expert
Jenkins Fundamentals Introduction, Features, Advantages, Jenkins Architecture, Master-Agent Concept ✅
Installation & Setup System Requirements, Installing Jenkins (Windows/Linux), Initial Setup, Web UI Basics, Plugins Setup ✅ ✅
Jenkins Jobs Freestyle Jobs, Build Triggers, Build Steps, Build Post-actions, Parameterized Jobs ✅ ✅
Build Management Source Code Integration (Git, SVN), Build Tools (Maven, Gradle, Ant), Poll SCM, Scheduled Builds ✅ ✅
Jenkins Pipeline Pipeline as Code, Declarative Pipeline, Scripted Pipeline, Pipeline Syntax, Stages & Steps ✅ ✅
Plugins & Integrations Plugin Management, Popular Plugins (Git, Email, JUnit, Slack), External Tool Integration ✅ ✅
Distributed Builds Master-Slave Setup, Node Configuration, Labels, Distributed Builds ✅ ✅
Security & Access Control User Management, Matrix-based Security, Role-based Access Control, Credentials Management ✅ ✅ ✅
CI/CD Concepts Continuous Integration, Continuous Delivery, Continuous Deployment, Best Practices ✅ ✅ ✅ ✅
Jenkinsfile Basics, Syntax, Declarative vs Scripted, Groovy Scripting, Advanced Jenkinsfile Usage ✅ ✅
Monitoring & Logging Build Logs, Console Output, System Logs, Jenkins Monitoring Tools ✅ ✅ ✅
Backup & Restore Backup Jenkins Configuration, Restoring Jenkins, Best Practices ✅ ✅ ✅
Notifications Email Notifications, Slack/MS Teams Integration, Custom Notification Scripts ✅ ✅ ✅
Integration with DevOps Tools GitHub/GitLab Integration, Docker, Kubernetes, Ansible, Terraform ✅ ✅ ✅
Scaling Jenkins Scaling Agents, Cloud Agents (AWS, Azure, GCP), Kubernetes-based Jenkins, Load Balancing ✅ ✅
Jenkins Security Advanced Securing Jenkins Master/Agents, Hardening, SSL/TLS, Security Best Practices ✅ ✅
Jenkins Administration Upgrading Jenkins, Managing Plugins, System Maintenance, Troubleshooting ✅ ✅ ✅
Advanced Pipelines Shared Libraries, Parallel Execution, Dynamic Agent Allocation, Pipeline Optimization ✅ ✅
Jenkins in Containers Running Jenkins in Docker, Docker Agents, Jenkins on Kubernetes, Helm Charts ✅ ✅
Enterprise Jenkins Jenkins Operations Center, High Availability, Enterprise Scaling, Governance ✅

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?

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