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How To Create a SSL Certificate on nginx for CentOS 6
TAGGED IN:  NGINX,  CENT OS
About Self-Signed Certificates A SSL certificate is a way to encrypt a site's information and create a more secure connection. Additionally, the certificate can show the virtual private server's identification information to site visitors. Certificate Authorities can issue SSL certificates that verify the server's details while a self-signed certificate has no 3rd party corroboration.
Intro Make sure that nginx is installed on your VPS. If it is not, you can quickly install it with 2 steps. Install the EPEL repository:

su -c 'rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm' 

Install nginx

yum install nginx

Step One—Create a Directory for the Certificate The SSL certificate has 2 parts main parts: the certificate itself and the public key. To make all of the relevant files easy to access, we should create a directory to store them in:

 sudo mkdir /etc/nginx/ssl

We will perform the next few steps within the directory:

 cd /etc/nginx/ssl

Step Two—Create the Server Key and Certificate Signing Request Start by creating the private server key. During this process, you will be asked to enter a specific passphrase. Be sure to note this phrase carefully, if you forget it or lose it, you will not be able to access the certificate.

sudo openssl genrsa -des3 -out server.key 1024

Follow up by creating a certificate signing request:

sudo openssl req -new -key server.key -out server.csr

This command will prompt terminal to display a lists of fields that need to be filled in.
The most important line is "Common Name". Enter your official domain name here or, if you don't have one yet, your site's IP address. Leave the challenge password and optional company name blank.

You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:US
State or Province Name (full name) [Some-State]:New York
Locality Name (eg, city) []:NYC
Organization Name (eg, company) [Internet Widgits Pty Ltd]:Awesome Inc
Organizational Unit Name (eg, section) []:Dept of Merriment
Common Name (e.g. server FQDN or YOUR name) []:example.com                  
Email Address []:[email protected]

Step Three—Remove the Passphrase We are almost finished creating the certificate. However, it would serve us to remove the passphrase. Although having the passphrase in place does provide heightened security, the issue starts when one tries to reload nginx. In the event that nginx crashes or needs to reboot, you will always have to re-enter your passphrase to get your entire web server back online. 
Use this command to remove the passphrase:

sudo cp server.key server.key.org
sudo openssl rsa -in server.key.org -out server.key

Step Four— Sign your SSL Certificate Your certificate is all but done, and you just have to sign it. 
Keep in mind that you can specify how long the certificate should remain valid by changing the 365 to the number of days you prefer. As it stands, this certificate will expire after one year.

 sudo openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt

You are now done making your certificate.
Step Five—Set Up the Certificate Open up the SSL config file:

 vi /etc/nginx/conf.d/ssl.conf

Uncomment within the section under the line HTTPS Server. Match your config to the information below, replacing the example.com in the "server_name" line with your domain name or IP address. If you are just looking to test your certificate, the default root there will work.

# HTTPS server

server {
    listen       443;
    server_name example.com;

    ssl on;
    ssl_certificate /etc/nginx/ssl/server.crt;
    ssl_certificate_key /etc/nginx/ssl/server.key; 
}

Then restart nginx:

 /etc/init.d/nginx restart

Visit https://youraddress. You will see your self-signed certificate on that page!
Resources
http://wiki.nginx.org/HttpSslModule#Generate_Certificates