Prasanta Kumar Behera
Jenkins — Level by Level
Learning Hub / CI/CD & GitOps

Jenkins — Level by Level

Beginner → Advanced8 lessonsAvailable

Jenkins still runs a large share of the world's builds. Learn how it's built, write declarative pipelines, build and publish container images, trigger builds from pull requests, share pipeline code across teams, run ephemeral agents on Kubernetes, and operate the controller securely: configuration as code, credentials, plugins, backups and upgrades.

You'll meetJenkinscontrolleragentsJenkinsfiledeclarative pipelinemultibranchwebhooksshared librariesKubernetes pluginBuildKitcredentialsJCasCplugins
Start lesson 01 →

What you'll be able to do

  • Explain the controller, agents, executors and plugins, and install Jenkins on Docker or Kubernetes
  • Write declarative pipelines with stages, conditions, parameters and credentials
  • Build, test, scan and publish container images from a pipeline
  • Build every branch and pull request automatically with multibranch pipelines and webhooks
  • Reuse pipeline code across teams with shared libraries
  • Run the controller as code, securely, with backups and safe upgrades

Before you start

Git for Engineers (Level 1), Docker & Containers (Level 1).

How it works

Each lesson: plain-language idea → how it really works → hands-on. Each section ends with a cheat sheet & self-check.

Curriculum

Lessons marked “Read” are ready; the rest are on the way.

Level 1 — Foundations

  1. 01Jenkins architecture and installationController, agents, executors, plugins; running Jenkins in Docker and on KubernetesRead →
  2. 02Declarative pipelinesJenkinsfile structure: agent, stages, steps, post, when, parameters, environmentRead →
  3. 03Build, test and publish imagesTests and reports, rootless container builds with BuildKit or Buildah, pushing to a registry, handing over to deploymentRead →
  4. 📋Cheat sheet & self-checkEvery command from this section on one page, then 9 questions to check yourself.Open →

Level 2 — Pipelines for teams

  1. 04Multibranch pipelines and webhooksEvery branch and pull request built automatically, status checks back to the Git serverRead →
  2. 05Shared librariesOne tested pipeline definition used by many repositoriesRead →
  3. 06Agents on KubernetesPod templates, ephemeral agents, caching and scalingRead →
  4. 📋Cheat sheet & self-checkEvery command from this section on one page, then 9 questions to check yourself.Open →

Level 3 — Operating Jenkins

  1. 07Security and operationsConfiguration as code, credentials, authorization, plugins, backups and upgradesRead →
  2. 08Jenkins in the real worldPipelines you'll inherit, resilience, and migrating gradually to newer systemsRead →
  3. 📋Cheat sheet & self-checkEvery command from this section on one page, then 6 questions to check yourself.Open →

Real-world scenarios

Work through each one: symptom → misleading signal → evidence → root cause → prevention.

The controller ran out of disk during a release

Workspaces, build history and artifacts filled the volume. Recover and prevent it.

A plugin update broke every pipeline

Roll back safely, then set up a tested upgrade routine.

Credentials leaked into a build log

Find how, rotate, and stop it happening again.

This site is a public version of my personal engineering knowledge hub. It intentionally excludes confidential company information and internal operational details.