load balancer example

examples/load-balancer/docker-compose.yml

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+version: '3'
+
+services:
+
+  myreverse:
+    image: bunkerity/bunkerized-nginx
+    restart: always
+    ports:
+      - 80:80
+      - 443:443
+    volumes:
+      - ./letsencrypt:/etc/letsencrypt
+      - ./http-confs:/http-confs
+      - ./server-confs:/server-confs
+    environment:
+      - SERVER_NAME=www.website.com # replace with your domain
+      - SERVE_FILES=no
+      - DISABLE_DEFAULT_SERVER=yes
+      - REDIRECT_HTTP_TO_HTTPS=yes
+      - AUTO_LETS_ENCRYPT=yes
+
+  app1:
+    build: js-app
+    restart: always
+    environment:
+      - NODE_ENV=production
+
+  app2:
+    build: js-app
+    restart: always
+    environment:
+      - NODE_ENV=production
+
+  app3:
+    build: js-app
+    restart: always
+    environment:
+      - NODE_ENV=production
+

examples/load-balancer/http-confs/upstream.conf

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+upstream app {
+	server app1:3000;
+	server app2:3000;
+	server app3:3000;
+}

examples/load-balancer/js-app/Dockerfile

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+FROM node
+
+COPY app/ /home/node/app
+
+RUN cd /home/node/app && npm install && chown -R root:node /home/node/app && chmod -R 770 /home/node/app
+
+WORKDIR /home/node/app
+
+USER node
+
+CMD ["node", "index.js"]

examples/load-balancer/js-app/app/index.js

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+const express = require('express')
+const app = express()
+const port = 3000
+var os = require("os");
+
+app.get('/', (req, res) => {
+  res.send('Container id = ' + os.hostname())
+})
+
+app.listen(port, () => {
+  console.log(`Example app listening at http://localhost:${port}`)
+})
+

examples/load-balancer/js-app/app/package.json

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+{
+  "name": "js-app",
+  "version": "1.0.0",
+  "description": "demo",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^4.17.1"
+  }
+}

examples/load-balancer/server-confs/reverse-proxy.conf

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+proxy_set_header Host $host;
+proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+
+location / {
+	proxy_pass http://app$request_uri;
+}