# jenkins

How to write Jenkins declarative pipelines from scratch — stages, agents, environment variables, credentials, parallel execution, post conditions, and shared libraries. Practical Jenkinsfile patterns for real projects.

Configure Jenkins to dynamically spin up Kubernetes pods as build agents. Covers the Kubernetes plugin, pod templates, JNLP agents, multi-container pods, resource limits, and RBAC — so you never manage static build nodes again.

How to integrate Nexus Repository Manager into GitHub Actions and Jenkins pipelines — publishing artifacts, pulling from proxy repos, tagging releases, and using Nexus IQ for security scanning.

Diagnose and fix Jenkins agents that go offline mid-build — resolve network timeouts, JVM heap issues, and SSH connection drops.

Resolve Jenkins Groovy sandbox errors by approving script signatures, configuring the script security plugin, and using safe alternatives.

Integrate Nexus and Artifactory with Jenkins, GitHub Actions, and GitLab CI — push artifacts, pull dependencies, and implement promotion workflows.

Master Jenkins declarative pipelines — stages, steps, post actions, environment variables, credentials, parallel execution, and when conditions.

Run Jenkins pipeline stages inside Docker containers for clean, reproducible builds — agent configuration, custom images, Docker-in-Docker, and Kaniko alternatives.

Install Jenkins on Ubuntu and Docker, configure security settings, manage plugins, and create your first freestyle and pipeline jobs step by step.

Build and maintain Jenkins shared libraries — directory structure, global vars, custom steps, class-based libraries, testing, and versioning strategies.