Installing Caddy

• Install caddy by going to the github page: - https://github.com/caddyserver/caddy/releases - wget the link you need (linux_amd64.tar.gz) and unpack the zip file with - tar -xvzf caddy_version_os_arch.tar.gz. - Move the file over to /usr/local/bin with mv caddy /usr/local/bin/caddy.

Domain Configuration

• With a Google Domain, Go to the Custom Resource Records, and set an A level record with a TTL to 1h and set the data field to the IPv4 address you have configured.
• Wait for about 5 minutes for the changes to take effect.
• Port 80 and Port 443 must be open.
• Run the following commands to open traffic to port 80 and 443.
• sudo iptables -A INPUT -p tcp -m multiport --dports 80,443 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT

Persisting iptable rules

• sudo apt-get install iptables-persistent will allow iptable rules to become persistent.
• at any time if you update rules, run sudo netfilter-persistent save to have them persist.

Running the Caddyfile

• Create a Caddyfile with the following contents

<!-- -->

domain.com

respond "Hello, Https!"

• Then, when you go to the domain, you should notice the server being served over https with a cert from letsencrypt.

As Reverse Proxy

• You can also use Caddy as a reverse proxy:
• run your server on a different port and have it route to it by using this caddyfile

<!-- -->

domain.com

reverse_proxy 127.0.0.1:${PORT}