openssl req -new -x509 -days 365 -sha1 -newkey rsa:1024 -nodes -keyout server.key -out server.crt -subj '/O=Company/OU=Department/CN=www.example.com'
www.example.com should be replaced by your server's specific values.
you might need
sudo before all that;
N.B. - the CN value should match what is actually shown in the browser URL bar. Otherwise you might get browser warnings saying that the certificate was meant for another domain.
Helped with this article: Owner (#httpd @ freenode)