Kubernetes cluster on AWS EKS, Part 5: Root domain redirection using Caddy Server with Automatic SSL

This is a series on setting up Kubernetes clusters in Amazon EKS.

In this post we will setup Root Level Redirection using Caddy Server.

Setting up root domain redirection can be rather tricky, given the following points:

  • Root domains @ can only have an A-Record under DNS therefore can only point to an IP Address. This causes issues if you are using something like AWS and are not using their DNS Name Servers using Route53.

  • With default Nginx Redirection, https redirection does not work, unless a custom SSL is installed.

  • ALIAS records, do not work unless extra plugin’s are installed for SSL.

  • SSL Certificates with Nginx requires extra installation and have to be and updated has to be updated regularly.

We want to achieve the following:

http://example.com => https://example.com => https://www.example.com

Caddy Installation Ubuntu

SSH to the Ubuntu Server and add the necessary dependencies with

sudo apt install -y debian-keyring debian-archive-keyring apt-transport-https -y

add the official Caddy GPG key

 curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | sudo gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg

Update Ubuntu Repository

curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' | sudo tee /etc/apt/sources.list.d/caddy-stable.list

Update apt:

sudo apt-get update

Install Caddy

sudo apt-get install caddy -y

Start and enable the Caddy service with:

sudo systemctl enable --now caddy

On opening the servers IP Address in the browser, you will be presented with the Default Caddy welcome page.

Update Caddy Configuration

We just need to add 2 re-directives for SSL redirection

  1. Set the SSL using tls
tls admin@example.com
  1. Set the redirection
redir https://www.{host}{uri}

Final, Caddy Configuration file

sudo nano /etc/caddy/Caddyfile
example.com {
tls admin@example.com
redir https://www.{host}{uri}

Reload Caddy Server

sudo systemctl reload caddy

On opening http://example.com it will redirect to https://example.com which, will redirect to https://www.example.com.

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