HTTPS with Caddy

Introduction
Prerequisites
Set HTTPS
- Adjust the Firewall
- Manage with zinit

Introduction

We show how to set HTTPS with Caddy for any deployment on the grid.

Prerequisites

A deployment on the TFGrid and SSH access

Set HTTPS

We set HTTPS with Caddy.

Install Caddy

apt install -y debian-keyring debian-archive-keyring apt-transport-https curl
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/gpg.key' | gpg --dearmor -o /usr/share/keyrings/caddy-stable-archive-keyring.gpg
curl -1sLf 'https://dl.cloudsmith.io/public/caddy/stable/debian.deb.txt' > /etc/apt/sources.list.d/caddy-stable.list
apt update
apt install caddy

Set a reverse proxy on port 80 with your own domain

caddy reverse-proxy -r --from example.com --to :80

You should see in the logs that it successfully obtains an SSL certificate, and after that you can try navigating to your site's domain again to verify it's working. Using a private window or adding https:// specifically might be necessary until your browser drops its cache.

When you're satisfied that everything looks good, hit ctl-c to exit Caddy and we'll proceed to making this persistent.

Adjust the Firewall

To use Caddy and set HTTPS, we want to allow port 443. If you are using ufw, add the permission for HTTPS:

Add the permissions

ufw allow 443

Manage with zinit

We manage Caddy with zinit.

Open the file for editing

nano /etc/zinit/caddy.yaml

Insert the following line with your own domain and save the file

exec: caddy reverse-proxy -r --from example.com --to :80

Add the new Caddy file to zinit

zinit monitor caddy

Zinit will start up Caddy immediately, restart it if it ever crashes, and start it up automatically after any reboots. Assuming you tested the Caddy invocation above and used the same form here, that should be all there is to it.

Here are some other Zinit commands that could be helpful to troubleshoot issues:

See status of all services (same as "zinit list")

zinit

Get logs for a service

zinit log caddy

Restart a service (to test configuration changes, for example)

zinit stop caddy
zinit start caddy

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