Setting up Cloudflare Tunnel ​

At first, I installed the Cloudflare daemon cloudflared on my GCP box. To be able to sudo apt install cloudflared, I first had to register the cloudflare repository. The steps consist of adding the repo and importing the PGP keys, all described on https://pkg.cloudflare.com.

The tunnel can be used to map mywhatsoever.ergberg.tk to localhost:3000. I came across this when checking for a simple way to renew my letsencrypt certificates. But it is so far not part of the solution.