Cert without nginx .conf file?

[theautomation]

First off, I've been using your docker image for a long time now and it works fantastically with nginx thanks for that!.
I have a question. is it also possible to create a certificate manually without using a nginx.conf file? So for example via command line?

When i do certbot certonly -d mail.mydomain.nl i get the following error.

Could not bind TCP port 80 because it is already in use by another process on this system (such as a web server). Please stop the program in question and then try again.

I have to get a certificate for a docker mailserver without reverse proxy

[JonasAlfredsson]

Hi theautomation,

It is nothing I have tried myself, but I don't think there should be too difficult to do.
I believe that by default certbot starts in "standalone" mode, which means that it will try to start a webserver on port 80, but that is occupied by Nginx in this image. Take a look on how the scripts makes a "webroot" request instead, which hands over the webserver responsibility to Nginx instead. By doing that I think it should be possible to ask for any cert you want.

[theautomation]

Hi JonasAlfredsson,

thanks for your reply, i have used a minimal config.conf file to get a certificate so i think this would be the best way to get a certificate without reverse proxy. When the certificate is there i can even delete the config file and the certificate renewal continues.

server {
server_name mail.theautomation.nl;
ssl_certificate /etc/letsencrypt/live/mail.theautomation.nl/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/mail.theautomation.nl/privkey.pem;
}