install ssl nginx/apache

Apache:
a2enmod ssl

SSLEngine on
SSLCertificateFile /etc/apache2/ssl/site_name.crt
SSLCertificateKeyFile /etc/apache2/ssl/site_name.key
SSLCertificateChainFile /etc/apache2/ssl/site_name.ca-bundle

apachectl configtest

Nginx:
listen server_ip:443;
ssl on;
ssl_certificate "/etc/nginx/ssl/site_name.crtca";
ssl_certificate_key "/etc/nginx/ssl/site_name.key";
ssl_ciphers EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH;
ssl_prefer_server_ciphers on;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;