first commit

.woodpecker.yml

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+steps:
+  - name: build-and-push
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: "registry.af-east-1.dc.koldsoftware.com/${CI_REPO_OWNER}/nodejs-app"
+      registry: "registry.af-east-1.dc.koldsoftware.com"
+      tags:
+        - "${CI_COMMIT_SHA:0:8}"
+        - latest
+      username:
+        from_secret: registry_username
+      password:
+        from_secret: registry_password
+
+  - name: deploy
+    image: hashicorp/nomad:latest
+    commands:
+      - nomad job run
+          -var="version=${CI_COMMIT_SHA:0:8}"
+          -var="domain=af-east-1.dc.koldsoftware.com"
+          job.hcl
+    environment:
+      NOMAD_ADDR: "http://192.168.2.106:4646"
+    when:
+      branch: main

Dockerfile

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+# Stage 1: install production dependencies
+FROM node:20-alpine AS deps
+WORKDIR /app
+COPY package*.json ./
+RUN npm install --omit=dev
+
+# Stage 2: final image — no dev tools, no npm cache
+FROM node:20-alpine
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY src/ ./src/
+EXPOSE 3000
+USER node
+CMD ["node", "src/index.js"]

job.hcl

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+variables {
+  version = "latest"
+  domain  = "homelab.local"
+  count   = 1
+}
+
+job "nodejs-app" {
+  datacenters = ["*"]
+  type        = "service"
+
+  update {
+    max_parallel     = 1
+    min_healthy_time = "10s"
+    healthy_deadline = "3m"
+    auto_revert      = true
+  }
+
+  group "nodejs-app" {
+    count = var.count
+
+    network {
+      port "http" { to = 3000 }
+    }
+
+    task "nodejs-app" {
+      driver = "docker"
+
+      config {
+        image = "registry.${var.domain}/kurt/nodejs-app:${var.version}"
+        ports = ["http"]
+      }
+
+      env {
+        NODE_ENV    = "production"
+        APP_VERSION = var.version
+        PORT        = "3000"
+      }
+
+      resources {
+        cpu    = 256
+        memory = 256
+      }
+    }
+
+    service {
+      name     = "nodejs-app"
+      port     = "http"
+      provider = "nomad"
+
+      tags = [
+        "traefik.enable=true",
+        "traefik.http.routers.nodejs-app.rule=Host(`nodejs-app.${var.domain}`)",
+        "traefik.http.routers.nodejs-app.tls=true",
+        "traefik.http.routers.nodejs-app.tls.certresolver=letsencrypt",
+      ]
+
+      check {
+        type     = "http"
+        path     = "/health"
+        interval = "10s"
+        timeout  = "2s"
+      }
+    }
+  }
+}

package.json

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+{
+  "name": "nodejs-app",
+  "version": "0.1.0",
+  "description": "Example Node.js app for homelab-dc",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "nodemon src/index.js"
+  },
+  "dependencies": {
+    "express": "^4.19.2",
+    "prom-client": "^15.1.0"
+  },
+  "devDependencies": {
+    "nodemon": "^3.1.0"
+  },
+  "engines": {
+    "node": ">=20"
+  }
+}

src/index.js

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+'use strict'
+
+const express = require('express')
+const promClient = require('prom-client')
+
+const app = express()
+const PORT = process.env.PORT || 3000
+
+// Prometheus metrics
+const collectDefaultMetrics = promClient.collectDefaultMetrics
+collectDefaultMetrics({ prefix: 'nodejs_app_' })
+
+const httpRequestDuration = new promClient.Histogram({
+  name: 'http_request_duration_seconds',
+  help: 'Duration of HTTP requests in seconds',
+  labelNames: ['method', 'route', 'status'],
+  buckets: [0.01, 0.05, 0.1, 0.5, 1, 5],
+})
+
+const httpRequestTotal = new promClient.Counter({
+  name: 'http_requests_total',
+  help: 'Total number of HTTP requests',
+  labelNames: ['method', 'route', 'status'],
+})
+
+// Metrics middleware
+app.use((req, res, next) => {
+  const end = httpRequestDuration.startTimer()
+  res.on('finish', () => {
+    const route = req.route ? req.route.path : req.path
+    const labels = { method: req.method, route, status: res.statusCode }
+    end(labels)
+    httpRequestTotal.inc(labels)
+  })
+  next()
+})
+
+app.use(express.json())
+
+app.get('/metrics', async (_req, res) => {
+  res.set('Content-Type', promClient.register.contentType)
+  res.end(await promClient.register.metrics())
+})
+
+app.get('/health', (_req, res) => {
+  res.json({ status: 'ok' })
+})
+
+app.get('/', (_req, res) => {
+  res.json({
+    message: 'Hello from Node.js!',
+    env: process.env.NODE_ENV || 'development',
+    version: process.env.APP_VERSION || 'unknown',
+  })
+})
+
+app.listen(PORT, '0.0.0.0', () => {
+  console.log(`Server listening on port ${PORT}`)
+})
+
+// Graceful shutdown — important for Nomad rolling deploys
+process.on('SIGTERM', () => {
+  console.log('SIGTERM received, shutting down gracefully')
+  process.exit(0)
+})