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+---
+title: "Certbot on Standalone Domains and Subdomains"
+date: 2021-07-02
+tags: ['server']
+---
+
+The command `certbot --nginx` will take an unencrypted website on an
+Nginx configuration file, get a certificate for it and change the
+configuration to use that certificate and thus HTTPS.
+
+Sometimes, however, you are given an Nginx configuration template that
+already has encryption/HTTPS, so running the automated `certbot --nginx`
+is not possible, as it will simply give an error saying that the
+certicate that Nginx is looking for doesn\'t already exist and thus the
+Nginx config is broken.
+
+So suppose you want to get a certificate for **pleroma.example.org**
+because you are installing Pleroma and the configuration file
+presupposes a certificate. In this case you would want to run this:
+
+```sh
+systemctl stop nginx
+certbot certonly --standalone -d pleroma.example.org
+systemctl start nginx
+```
+
+What we do here is temporarily turn of Nginx, then run a `certonly`
+subcommand that generates a certificate for the domain without changing
+or caring about the Nginx configuration. Then we reactivate Nginx, thus
+turning back on our webserver.
+
+The reason we deactivate Nginx is that it uses the ports that Certbot
+will want to bind to, and thus we must temporarily turn Nginx off to let
+Certbot use those ports. (What it actually does is spin up a dummy
+webserver that doesn\'t need to think about the Nginx configuration.)
+
+This is just a little note of something that might confuse people, but
+the three commands above should suffice. If your site is still managed
+by Nginx, it should still be able to renew with simple
+`certbot renew --nginx` without a problem.