Here, they are called with the hostname (host.domain.tld. {Key, cert}), but I do not know if this is a standard.
Obviously the standard is to name with the hash (```openssl x509-noout-hash-in cert_file```).
But otherwise why not use the default certificate generated by openssl?
* ```/etc/ssl/certs/ssl-cert-snakeoil.pem```
* ```/etc/ssl/private/ssl-cert-snakeoil.key```