Docker Image with OpenSSL s_client and s_server
docker build -t wechris/opensslserver .
docker run -it -p 8443:8443 --name opensslserver wechris/opensslserver
https://wiki.openssl.org/index.php/Manual:S_server(1)
https://trent.utfs.org/wiki/OpenSSL
https://stroessenreuther.info/knowledge/Tools_und_Bibliotheken/OpenSSL.html
https://news.ycombinator.com/item?id=9968207
https://github.com/KHP-Informatics/httpd-php7-ssl-docker