CyberSite.net Knowledge Base
How Do I Modify My Host File? • Article 363

Summary
Modifying your hosts file will allow you to point your domain to a specific IP. This can be used to test your site without the test link, prior to going live with SSL, verify an alias site works prior to DNS changes, or for other DNS related reasons. This causes your local machine only to look directly at the IP specified.

Your hosts file will need to have two entries added that will contain the IP address you want the site to resolve to and the address. Adding the below two lines for example will point www.domain.com and domain.com to our current PHP5-ITK ("Refreshed" PHP5) cluster:

64.49.219.194 www.domain.com
64.49.219.194 domain.com

Below is how to locate and edit the hosts file on several OS platforms. Once the proper domain information is added you will save the file and your system will begin resolving to the specified IP. Once testing is finished these entries should be removed.

Windows Vista
Vista uses User Account Control (UAC) so Notepad must be ran as Administrator:
1)  Click Start -> All Programs -> Accessories
2)  Right click Notepad and select Run as administrator
3)  Click Continue on the "Windows needs your permission" UAC window.
4)  When Notepad opens Click File -> Open
5)  In the filename field type C:WindowsSystem32Driversetchosts
6)  Click Open

Windows NT/2000/XP
1) Click Start -> All Programs -> Accessories -> Notepad
2) Click File -> Open
3) In the filename field type C:WindowsSystem32Driversetchosts
4) Click Open

Linux
1) Open a terminal window
2) Type sudo nano /etc/hosts (you can substitute any text editor)
3) Enter your password

Mac OS X 10.2 or later
Edit the /private/etc/hosts file. For more information on how to use the hosts file, open Terminal and type: man hosts

Note: Editing this file requires root privileges.

Mac OS X 10.0 through 10.1.5
1. Open /Applications/Utilities/NetInfo Manager.
2. To allow editing the NetInfo database, click the padlock in the lower left corner of the window.
3. Enter your Admin password and click OK
4. In the second column of the browser view, select the node named "machines." You will see entries for  -DHCP-, broadcasthost, and localhost in the third column.
5. The quickest way to create a new entry is to duplicate an existing one. So select the "localhost" item in the third column.
6. Choose Duplicate from the Edit menu. A confirmation alert appears.
7. Click Duplicate. A new entry called "localhost copy" appears, and its properties are shown below the browser view.
8. Double-click the value of the ip_address property and enter the IP address of the other computer.
9. Double-click the value of the name property and enter the hostname you want for the other computer.
10. Click the serves property and choose Delete from the Edit menu.
11. Choose Save from the File menu. A confirmation alert appears.
12. Click Update this copy.
13. Repeat steps 6 through 12 for each additional host entry you wish to add.
14. Choose Quit from the NetInfo Manager menu. You do not need to restart the computer.


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