Errors and Traefik Ingress over HTTPS When trying to setup this website, I wanted to use Cert Manager to handle the job of managing TLS certificates issued by Let’s Encrypt. The HTTP server always worked fine. For instance, running curl http://chadl.tech/index.html would show the HTML contents as expected. However when I’d try the same thing over HTTPS, I kept getting a 404: curl https://chadl.tech/index.html 404 Page Not Found The “page” rendered by the failure was a little peculiar.

Troubleshooting the Traefik ingress controller can leave you scratching your pate. Errors bubble up, but Traefik is completely mum about what’s gone wrong (logs are terse or non-existent by default.) Internal Server Error This one I found happens whenever your ingress wants to access a backend service that is itself protected by TLS self-signed certificate. I.e., you didn’t bother to acquire, nor sign up to maintain a CA-signed cert for this backend service.

Recently GitHub changed it so I could no longer push using https protocol. At work, I always used ssh to push. So when this happened, I thought, “No problem, I’ll just add my ssh key to my GitHub profile.” So when I went to do that, I was getting an error saying “Key is already in use.” So it took me a long time to realize that this was happening because I had already added my ssh key to my work github profile, which I rarely have occasion to use.