You are absolutely correct , once you made the port changes in the nginx conf as i mentioned in my last reply , you will be able to use both apache n nginx the same time on your server
so http://yourdomain.com:81 will lead to the nginx page
and http://yourdomain.com will lead to the current website running on apache

Regards
Vishnuprasad

Thanks a lot for replying.

However, my concerned is this.

I have my ready made website running on apache.

Now, if I install nginx (as discussed above), WILL I BE ABLE TO USE NGINX SERVER FOR MY EXISTING WEB SITE PAGES?

because,

Now test the nginx installation from your browser
http://your-up-address:81
will open that default nginx page only

and when I will browse

http://www.mydomain.com

It will still go through port 80 and apache will handle request and open my website, won’t it?

Kindly clarify.

Thanks for your great tutorial and help once again.

First of all thanks for reading this post

And from your querry I believe what the issue is that both your apache and nginx instances are configured to listen on
port “80″ on your server/machine.

That is why you were not able to start the nginx while your httpd is running, so you have stopped the apache process by
“service httpd command” , and once after that you will be able to start nginx .

But Your current web pages are configured only in the apache configuration “httpd.conf” , so that is why you are
redirecteted to the default nginx page since there is no such web pages are configured in the nginx conf.

So to resolve this you will either be required to change the nginx port from the nginx configuration so that it will listen on
any other port other than 80 and you will be able to run both apache and nginx the same time . Another method is to
configure nginx to use this webpages that is to add host entries in the nginx configuration

But i believe the former option will be apt for you because you already have a completely working apache instance .
But if you preffer nginx than apache then you have to configure the nginx with the host configurations and may be some
modules if your web pages/application requires . But I will preffer running both servers simultaneoulsy in your case

The Port change method is given bellow

To change the port on which the nginx daemon listen, please follow these steps

1) Stop the nginx service(if running)
/etc/init.d/nginx stop

2) open your nginx main configuration file in a text editor ( if you have followed the installation directory that i’v
showed in the post then please open “/usr/local/nginx/conf/nginx.conf”)

3) go to the “server” directive in the “http” host entry , this will look like

======================================================
http {
include mime.types;
default_type application/octet-stream;
* * * * **
**
*
server {
listen 80;
server_name localhost;
* * * * **
**
*
}
[please note i have not included all those junk parts in that file , only the required ones are shown
above ]

4) In that sever directive you can see the Listen attribute , please change it to any other port other than
80 (as i told you earlier you need the 80 port for apache )

suppose if you want to use the port 81 for your nginx then your server directive should be like

server {
listen 81;
server_name localhost;
. . . . . .
. . . . . . .
…
.
}

5) once changed the listen port then save the configuration , and start nginx
/etc/init.d/nginx start

6) Now test the nginx installation from your browser
http://your-up-address:81
example
——–
http://192.168.1.2:81

7) Now you can get both nginx and your native apache instance working together, and all your current webpages
will be working fine as well as the new nginx server

PS: if your apache daemon is not running (may be you have stopped that for the nginx service) , then please start the
apache process to get your current webpages working

If you find the above reply not useful , or if you still facing any issue , please let me know that

Have a great day

Thank you very much for posting this tutorial. However, I have one problem due to which it is not working for me.

Before executing /etc/init.d/nginx restart

I have to execute service httpd stop then only
/etc/init.d/nginx restart works

That’s OK

but when I browse http://www.mydomain.com, it still shows that “Welcome to nginx” page and not my site pages (i.e. my already uploaded php pages)

Yes, I have made nginx install on my existing server and my files are in
/home/….. directory.

I believe that putting “root /usr/local/nginx/html;” in nginx.conf leads to this index.html

Kindly let me know how can I configure newly installed nginx to resolve to my existing php pages of existing domain.

Looking for your response.

Thank you