Tip: there are ways to renew without running the standalone version (this means "host me a webserver to request my ssl") and thus not having to stop your http-server, but they require more work.
location /.well-known/acme-challenge/ {
alias {directory};
try_files $uri =404;
}
to the Nginx config of each site, then having a script on cron that generates the csr and calls acme_tiny. It's fairly easy to set up and you can be reasonably sure it won't screw up your site if it fails for some reason.Example: https://gist.github.com/cecilemuller/a26737699a7e70a7093d4dc...