Primary certificate and intermediate certificate.You should have received a your_domain_name.pem file from DigiCert in an email when your certificate was issued. This .pem file contains both your primary certificate and the intermediate certificate. If you have that .pem file you can skip to step 4.If you still need to concatenate your primary certificate and your intermediate certificate in to a single file, start with step 2.
Copy the Certificate files to your server.
Concatenate the primary certificate and intermediate certificate.You need to concatenate the primary certificate file (your_domain_name.crt) and the intermediate certificate file .crt into a single pem file by running the following command:cat your_domain_name.crt gd_bundle.crt >> bundle.crt
Edit the Nginx virtual hosts file.Now open your Nginx virtual host file for the website you are securing. If you need your site to be accessible through both secure (https) and non-secure (http) connections, you will need a server module for each type of connection. Make a copy of the existing non-secure server module and paste it below the original. Then add the lines in bold below:server {listen 443;ssl on; ssl_certificate /etc/ssl/your_domain_name.pem; (or bundle.crt) ssl_certificate_key /etc/ssl/your_domain_name.key;server_name your.domain.com; access_log /var/log/nginx/nginx.vhost.access.log; error_log /var/log/nginx/nginx.vhost.error.log; location / { root /home/www/public_html/your.domain.com/public/; index index.html; }}Adjust the file names to match your certificate files:
ssl_certificate should be your primary certificate combined with the intermediate certificate that you made in the previous step (e.g. your_domain_name.crt).
ssl_certificate_key should be the key file generated when you created the CSR.
Restart Nginx.Run the following command to restart Nginx:sudo /etc/init.d/nginx restart