Инициализация

.dockerignore

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+node_modules
+.DS_Store
+.vscode

.gitea/workflows/deploy.yaml

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+name: Build and push Docker image
+on: [push]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ vars.REGISTRY }}
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ vars.REGISTRY }}/${{ vars.PACKAGE }}:latest

.gitignore

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+node_modules
+.DS_Store
+.vscode

Dockerfile

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+# Используем стабильный образ Node.js на Alpine для минимального размера
+FROM node:20-alpine
+
+WORKDIR /usr/src/app
+
+# Устанавливаем зависимости
+COPY package*.json ./
+RUN npm install --production
+
+# Копируем основной скрипт
+COPY server.js .
+
+# Порт для Keepalived
+EXPOSE 8080
+
+# Запускаем приложение
+CMD [ "npm", "start" ]

package.json

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+{
+  "name": "minimal-health-proxy",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^4.18.2",
+    "dockerode": "^4.0.0"
+  }
+}

server.js

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+import express from 'express'
+import Docker from 'dockerode'
+
+const app = express()
+const PORT = 8080
+const docker = new Docker({ socketPath: '/var/run/docker.sock' })
+
+async function getServiceStatusCode(serviceName) {
+  try {
+    const service = docker.getService(serviceName)
+    const tasks = await service.tasks({ filters: { service: [serviceName] } })
+
+    if (tasks.length === 0) {
+      return 503
+    }
+
+    const isHealthy = tasks.some(task => {
+      const state = task.Status.State
+      const healthStatus = task.Status.ContainerStatus?.Health?.Status
+
+      if (healthStatus === 'healthy' || (state === 'running' && !healthStatus)) {
+        return true
+      }
+
+      return false
+    })
+
+    return isHealthy ? 200 : 503
+  } catch (error) {
+    if (error.statusCode === 404) {
+      return 404
+    }
+
+    return 503
+  }
+}
+
+app.get('/health/:service', async (req, res) => {
+  const service = req.params.service
+
+  if (!service || !/^[a-zA-Z0-9_-]+$/.test(service)) {
+    return res.sendStatus(400)
+  }
+
+  const statusCode = await getServiceStatusCode(service)
+  res.sendStatus(statusCode)
+})
+
+app.use((_, response) => response.sendStatus(404))
+
+app.listen(PORT, () => {
+  console.log(`Health Check Proxy listening on port ${PORT}`)
+})