Hosting Mountain Lion Software Updates on 10.6 or 10.7 Servers

This information came directly from Apple's KB:

1. Update your server to Mac OS X Server v10.6.8 (or 10.7)
2. Stop the Software Update service if it is running.
3. Quit Server Admin if it is active.
4. Update /etc/swupd/swupd.plist to begin hosting OS X Lion software updates. (See details below.)
5. Update /etc/swupd/swupd.conf to allow OS X Lion computers to receive updates. (See details below.)
6. Open Server Admin and start the Software Update service.
7. Use the instructions in Mac OS X Server v10.6: Using the Software Update service with multiple Mac OS X client versions to point your OS X Lion clients to this server.

In step 4, you will need root access to update the file /etc/swupd/swupd.plist. To be safe, make a backup copy of the file before editing it. Add the string in bold below to the otherCatalogs array:

    otherCatalogs
   
        index-leopard.merged-1.sucatalog
        index-leopard-snowleopard.merged-1.sucatalog
        index-lion-snowleopard-leopard.merged-1.sucatalog
   

For Mountain Lion change the string to:

index-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog

In step 5, you will need root access to update the file /etc/swupd/swupd.conf. To be safe, make a backup copy of the file before editing it. Locate the following line near the end of the file:

    RewriteCond %{HTTP_USER_AGENT} Darwin/11

Edit the following line to read:

    RewriteRule ^/index\.sucatalog$ /index-lion-snowleopard-leopard.merged-1.sucatalog

For Mountain Lion change the string to:

RewriteRule ^/index\.sucatalog$ /index-mountainlion-lion-snowleopard-leopard.merged-1.sucatalog