Novell ZENWORKS LINUX MANAGEMENT 7.2 IR2 - ADMINISTRATION GUIDE 09-25-2008, Руководство администратора

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Understanding Preboot Services in ZENworks Linux Management 331
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28.4 The Preboot Services Processes
The following sections explain how the Preboot Services processes work:
Š
Section 28.4.1, “A Typical Preboot Services Operation,” on page 331
Š
Section 28.4.2, “Illustrating the Preboot Services Processes,” on page 331
28.4.1 A Typical Preboot Services Operation
A typical Preboot Services operation flows as follows:
1. A Preboot bundle is created in the ZENworks Control Center and assigned to a PXE-enabled
device.
2. The PXE-enabled device starts to boot.
3. The device sends a DHCP discovery request to determine the IP address of the Preboot
Services imaging server.
4. The DHCP server responds with an IP address for the device to use.
5. The novell-proxydhcp daemon responds with the IP addresses of the TFTP server, as well as
the filename of the Preboot Services bootstrap program (
nvlnbp.sys
).
6. The PXE device downloads the Preboot Services bootstrap program using novell-tftp.
7. After the Preboot Services bootstrap program is downloaded and executed, the device checks
novell-zmgprebootpolicy to see if there is any imaging work to do.
8. If there is imaging work to do (as contained in a Preboot bundle that is assigned to the device),
the device downloads the Linux Management imaging environment from the server so that the
it can be booted to Linux.
9. Any imaging tasks contained in the Preboot bundle are performed.
10. If there are no imaging tasks to perform, files are not downloaded and the device proceeds to
boot to its operating system.
In addition to using PXE for automation, you can also execute Preboot work manually using one of
the following:
Preboot Services Menu (if enabled for the device)
Preboot Services bootable CD or DVD
ZENworks partition
For more information, see Section 30.1.2, “Performing Manual Imaging Tasks,” on page 405 .
28.4.2 Illustrating the Preboot Services Processes
The following illustrations show the interaction between a Preboot Services (PXE) device and a
Preboot Services imaging server, starting when the PXE device is turned on and begins to boot, and
ending when imaging work begins on that device.
The following example assumes that the devices and imaging servers are in the same network
segment.
Š
“Phase 1: Beginning the Process” on page 332
Š “Phases 2 through 8: Continuing the Process” on page 334