Add Caddy example with Caddyfile using docker-gen

Author: HugoDF

README.md

@@ -19,13 +19,13 @@ The Node code is at [./caddy/app/index.js](./caddy/app/index.js) and [./nginx/ap
 
 It also has a reverse-proxy set up using Caddy and nginx respectively which
 
-## Caddy Example
+## Caddy Example with Caddyfile
 
 > Caddy is the HTTP/2 web server with automatic HTTPS.
 > 
 > https://caddyserver.com/
 
-See [./caddy](./caddy), uses https://github.com/abiosoft/caddy-docker Docker image.
+See [./caddy](./caddy), uses [https://github.com/abiosoft/caddy-docker](https://github.com/abiosoft/caddy-docker) Docker image.
 
 To run it:
 
@@ -38,13 +38,25 @@ Then either nagivate to https://foo.test or `curl https://foo.test`.
 
 > Note: the nginx example needs to be stopped before starting the Caddy example
 
+## Caddy example with docker-gen
+
+> Caddy is the HTTP/2 web server with automatic HTTPS.
+> 
+> https://caddyserver.com/
+
+This image leverages [Docker-gen](https://github.com/jwilder/docker-gen) to "Generate files from docker container meta-data".
+
+Which allows us to build the configuration for the reverse proxy using labels on the target container (without a Caddyfile, that's the file generated from the labels).
+
+See [./caddy-gen](./caddy-gen), uses [https://github.com/abiosoft/caddy-docker](https://github.com/wemake-services/caddy-gen) Docker image.
+
 ## nginx Example
 
 > [nginx](https://www.nginx.com/) is a web server which can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
 > 
 > Wikipedia
 
-See [./nginx](./nginx), uses https://github.com/jwilder/nginx-proxy Docker image.
+See [./nginx](./nginx), uses [https://github.com/jwilder/nginx-proxy](https://github.com/jwilder/nginx-proxy) Docker image.
 
 ```sh
 cd nginx

caddy-gen/app/Dockerfile

@@ -0,0 +1,12 @@
+FROM node:10
+
+WORKDIR /node/app
+
+COPY ./index.js /node/app
+
+ENV NODE_ENV production
+
+ENV PORT 8080
+EXPOSE 8080
+
+CMD ["node", "index.js"]

caddy-gen/app/index.js

@@ -0,0 +1,8 @@
+const http = require('http')
+
+const server = http.createServer((req, res) => {
+  res.writeHead(200, { 'Content-Type': 'text/plain' });
+  res.end('Hello world');
+});
+
+server.listen(process.env.PORT)

caddy-gen/certs/.gitkeep

@@ -0,0 +1,20 @@
+version: '3'
+services:
+  caddy:
+    image: "wemakeservices/caddy-gen:latest"
+    volumes:
+      - /var/run/docker.sock:/tmp/docker.sock:ro # needs socket to read events
+      - ./certs:/root/certs # to sync mkcert certificated to Caddy
+    ports:
+      - "443:2015"
+    depends_on:
+     - web
+
+  web:
+    build: ./app
+    labels:
+      - "virtual.host=foo.test"
+      - "virtual.port=8080"
+      - "virtual.tls-email=/root/certs/foo.test.pem /root/certs/foo.test-key.pem"
+
+

caddy-gen/docker-compose.yml

@@ -15,6 +15,15 @@ echo """
 cp ./foo.test.pem ./caddy/certs
 cp ./foo.test-key.pem ./caddy/certs
 
+echo """
+==================================================
+  Copying foo.test certificates to ./caddy-gen/certs
+==================================================
+"""
+
+cp ./foo.test.pem ./caddy-gen/certs
+cp ./foo.test-key.pem ./caddy-gen/certs
+
 echo """
 ==================================================
   Copying foo.test certificates to ./nginx/certs