nginx ssl configuration

ssl_session_timeout 60m;
ssl_session_cache shared:SSL:2m;

ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!3DES:!MD5:!PSK';

ssl_prefer_server_ciphers on;
ssl_dhparam /etc/nginx/cert/dhparam.pem;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

ssl_stapling on;
ssl_stapling_verify on;

ssl_certificate          /opt/dehydrated/certs/example.com/fullchain.pem;
ssl_certificate_key      /opt/dehydrated/certs/example.com/privkey.pem;
ssl_trusted_certificate  /opt/dehydrated/certs/example.com/cert.pem;

# add Strict-Transport-Security to prevent man in the middle attacks (HSTS):
add_header Strict-Transport-Security "max-age=31536000" always;
resolver 8.8.8.8 8.8.4.4;