https://datacenteroverlords.com/2012/03/01/creating-your-own-ssl-certificate-authority/
https://httpd.apache.org/docs/trunk/ssl/ssl_howto.html
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/SSL-on-an-instance.html
https://www.digicert.com/ssl-certificate-installation-ubuntu-server-with-apache2.htm
https://www.digitalocean.com/community/tutorials/how-to-create-a-ssl-certificate-on-apache-for-ubuntu-14-04