Install SSL certificate in Nginx (Using .crt & .ca-bundle certificate files)

gistfile1.txt

Step 1 - Create .crt file 

cat domainname.crt domainname.ca-bundle > domainname-ssl-bundle.crt

Step 2- 

Add lines for ssl_certificate in nginx configuration

server {
      listen 80 default_server;
      listen [::]:80 default_server ipv6only=on;
      listen 443 ssl;
      ssl_certificate /etc/ssl/certs/domainname-ssl-bundle.crt;
      ssl_certificate_key /etc/ssl/private/domainname.key;

      ssl_session_timeout 5m;
      ssl_protocols SSLv3 TLSv1;
      ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv3:+EXP;
      ssl_prefer_server_ciphers on;
}