Certificate Installation: NGINX with Comodo SSL

Here is the guide to show you how to install the Comodo SSL certificate in Nginx.

Order Comodo Certificate. And received the Certificate files.
I don’t discuss how to get it, where to get it. It is another topic. You will receive following files.
Positive SSL certificate, it is a zip file emailed to you. Unzip it and get four files.
- Root CA Certificate – AddTrustExternalCARoot.crt
- Intermediate CA Certificate – COMODORSAAddTrustCA.crt
- Intermediate CA Certificate – COMODORSADomainValidationSecureServerCA.crt
- Your PositiveSSL Certificate – www_example_com.crt (or the subdomain you gave them)
Make the file for Nginx
```
cat  www_example_com.crt COMODORSADomainValidationSecureServerCA.crt COMODORSAAddTrustCA.crt > your_domain_crt.pem 
```
I just need your certificate and intermediate certificates. Root is already installed in every single computer or browser. The order of certificates is important.
Save this file into the place you want Nginx use
```
mv your_domain_crt.pem /etc/nginx/ssl/
```
Save your private key in the same place
```
mv your_domain_key.pem
```

Make sure your Nginx config file looks like below

server {
listen 443 ssl;

ssl_certificate /etc/nginx/ssl/your_domain_crt.pem;
ssl_certificate_key /etc/nginx/ssl/your_domain_key.pem;

# side note: only use TLS since SSLv2 and SSLv3 have had recent vulnerabilities
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;

# ...

}