Need to void Staging Server in Search Engine

We have two server in .

1) Production Server 2) Staging Server

While googling i can find the Staging Server links are displayed in the search results. How to avoid the Staging links that are displayed in开发者_如何学JAVA the seearch engine.

Thanks, velu

Here a link where the robots.txt is explained. You can prevent spidering your staging server by having such a file in you web root.