How to setup dns to redirect app.example.com to another ip?

Posted by AZ. on Server Fault See other posts from Server Fault or by AZ.
Published on 2014-05-30T21:42:26Z Indexed on 2014/05/31 3:30 UTC
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dns

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virtualhost

I have a site www.example.com running on a hosting company.

Now I want to create a separate web app on my VPS and let it accessible via app.example.com

How can I set the DNS to redirect app.example.com to my VPS' ip address? CNAME or A Record?

Also, If I want to do a mail server on my VPS too, how to setup the DNS?

EDIT:

Existing site: www.example.com
Location: some hosting company that I don't control. It's running PHP with nginx I guess (or aphache)

New site (that I'm working on): app.example.com
Location: my VPS, it has an IP address, the VPS is running nodejs. It can run along with nginx but currently it's not.

I want the existing website continue working (as customer visit www.example.com) and I want customer to visit app.example.com for some new features.

The two websites are NOT on the same server and not using the same IP address.

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