Jenkins -- Portfolio Projects
Project 1: Node.js CI with Coverage Gate
Level: Beginner | Time: 1-2 days | GitHub: jenkins-nodejs-pipeline
Pipeline that enforces 80% code coverage -- fails the build if coverage drops below threshold.
groovy
pipeline {
agent { docker { image "node:20-alpine" } }
environment {
DOCKER_CREDS = credentials("dockerhub-creds")
IMAGE = "yourdockerhub/nodeapp"
COVERAGE_MIN = 80
}
stages {
stage("Install") { steps { sh "npm ci" } }
stage("Lint") { steps { sh "npm run lint" } }
stage("Test + Coverage") {
steps { sh "npm test -- --coverage" }
}
stage("Coverage Gate") {
steps {
script {
def cov = sh(script: "cat coverage/coverage-summary.json | python3 -c \"import sys,json; print(json.load(sys.stdin)[\'total\'][\'lines\'][\'pct\'])\"",
returnStdout: true).trim().toFloat()
if (cov < env.COVERAGE_MIN.toFloat()) {
error "Coverage ${cov}% below ${env.COVERAGE_MIN}%"
}
}
}
}
stage("Build & Push") {
when { branch "main" }
steps {
script {
docker.withRegistry("", "dockerhub-creds") {
docker.build("${IMAGE}:${BUILD_NUMBER}").push()
}
}
}
}
}
post {
failure { slackSend channel: "#ci", color: "danger", message: "FAILED: ${JOB_NAME}" }
}
}
Steps: Jenkins via Docker, webhooks, Blue Ocean, intentionally break coverage to test gate
Project 2: Multi-Environment Deployment with Approvals
Level: Intermediate | Time: 2-3 days | GitHub: jenkins-multienvironment-deploy
Build once, deploy to dev automatically, then staged approvals for staging and production.
groovy
stage("Approve Staging") {
steps {
input message: "Deploy ${BUILD_NUMBER} to Staging?",
ok: "Deploy",
submitter: "senior-devops,team-lead"
}
}
stage("Deploy Staging") {
steps {
sh "kubectl set image deployment/myapp myapp=myrepo/myapp:${BUILD_NUMBER} -n staging"
}
}
stage("Approve Production") {
steps {
input message: "Deploy to PRODUCTION?",
ok: "YES - Deploy",
submitter: "engineering-manager"
}
}
Steps: 3 K8s namespaces, approval gates, rollback parameter, MTTR tracking
Portfolio Checklist
•[ ] Jenkinsfiles in the same Git repo as the application
•[ ] No credentials in Jenkinsfile -- use Jenkins Credential Store
•[ ] Pipeline fails fast (lint before test, test before build)
•[ ] Blue Ocean UI configured
