Multi-host wildcard caddy example

README.md

Caddy multiple virtual hosts

Run caddy to proxy requests to multiple upstream servers running on different ports on the same box.

How to

On the box you want to analyze:

# Download caddy
mkdir -p caddyserver && cd caddyserver
wget <>
tar -xzvf <>
cd -

# Add the Caddy file, flask server from this example

# Start caddy
./runserver.sh

Create a wildcard route to your server (*.myhost.com). Route 53 works well for this.

In your browser:

• Visit http://a.myhost.com. You should see Hello World from port 8091!
• Visit http://b.myhost.com. You should see Hello World from port 8092!

How it works

The Caddyfile in the current directory makes caddy serve to

• http://a.myhost.com/ -> 8091
• http://b.myhost.com/ -> 8092

Caddyfile

a.myhost.com {
  tls off
  root /var/www/
  proxy / localhost:8091
  log log/access.a.log
}

b.myhost.com {
  tls off
  root /var/www/
  proxy / localhost:8092
  log log/access.b.log
}

hello_port.py

import argparse
from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello World from port %d!' % options.port

if __name__ == '__main__':
    parser = argparse.ArgumentParser("Hello world with port information")
    parser.add_argument('port',
        action='store',
        type=int,
        help="Port to run on."
    )
    options = parser.parse_args()
    app.run(port=options.port)

runserver.sh

#!/bin/bash

# Create directory for access log
mkdir -p log

# Start upstreams
python hello_port.py 8091 &
python hello_port.py 8092 &

# Start caddy proxy server
caddyserver/caddy -conf Caddyfile -port 80