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Blessing an El Capitan Device for NetBooting

Blessing an El Capitan Device for NetBooting

In OS X 10.11 El Capitan, Apple has introduced their new System Integrity Protection feature which affects how you are able to NetBoot devices. If you think you’ll have the need to NetBoot a device anytime in the future, after it leaves your hands, you’re going to need to “bless” it with your sanctioned NetBoot servers prior to it going out the door.

Blessing a device with a NetBoot server is easy and only takes a couple of minutes per device, however, it is very hands on and will be extremely time consuming if you have a ton of devices – especially if they’re already in the field so plan accordingly prior to upgrading to El Capitan.

Watch the how-to video:

  1. Turn on or restart the device to be “blessed”
  2. Press and hold the keys Command (⌘)-R immediately after you turn on your Mac and hear the startup sound. Keep holding until you see the progress bar.
  3. When the device boots into the Recovery Mode, you should see a Mac OS X Utilities toolbar.  If you end up back to your typical login screen, reboot and try hitting the Command (⌘)-R keys again.Recovery Mode
  4. Navigate to the Utilities menu bar item and select Terminal
  5. Type the following command in Terminal to add a trusted server. Change address to the IP address of your NetBoot server (PXE representatives, preferred servers, core servers)
csrutil netboot add address
  1. Repeat step 5 for any additional NetBoot servers (PXE representatives, preferred servers, core servers)
  2. To verify your NetBoot servers have been added, type the following command in Terminal in either the Recovery Mode session or after having booted back into the OS
csrutil netboot list
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