Red Hat SATELLITE 5.3.0 RELEASE NOTES Przewodnik Instalacji Pobierz pdf (Strona 15)

Bare Metal

8.1.2.1. Configuring an External DHCP Server

To configure your DHCP server (assuming you are using ISC DHCPd) to point to the PXE server,

simply add the following to your configuration in /etc/dhcpd.conf:

next-server satellite.example.com;

filename "pxelinux.0";

Replace satellite.example.com with your Satellite Server's FQDN. After restarting your dhcp

server, any clients that attempt to PXE boot will try to use the Satellite server as its PXE server.

You may want to assign the next-server only for a particular subnet or set of computers. Refer to the

documentation on your DHCP server for information.

8.1.2.2. Enabling the TFTP server

As part of the Satellite installation itself, the TFTP server should be enabled. You can check this by

running:

chkconfig --list tftp

You can enable it by running:

chkconfig tftp on

service xinetd restart

8.1.2.3. Cobbler configuration

Cobbler is already set up to generate pxe configurations, but you may want to adjust the

pxe_just_once configuration option depending on how your machines BIOSes are configured, for

the best possible PXE workflow.

A common setup has PXE occur first in the BIOS order, effectively not booting off the local disk unless

the PXE server instructs the system to do so remotely. By having pxe_just_once: 1 (enabled) in /

etc/cobbler/settings, it will prevent "boot loops" where the system continually reinstalls. What

happens is that the $kickstart_done macro in the kickstart templates will expand into a directive

that indicates to the cobbler server that the system will then boot locally, instead of booting from the

network. Then, to reinstall the system, the netboot-enabled flag on the system can be toggled

back on via the Satellite GUI or Cobbler. Once enabled, the next time the system power cycles it will

PXE install instead of booting locally. At the end of each install, the server will trip the netboot-enabled

flag back to off again to tell the system to boot to the local hard drive the next time it powers up. Note

that if your kickstart is missing the $kickstart_done line in %post, this will not work, and boot loops

will occur.

With pxe_just_once set to 0, the netboot enabled flag will not be disabled after an install, so if PXE

is first in your BIOS boot order, the system will loop indefinitely. If you have the BIOS of the system set

up to boot to local hard drives first, though, there is no need to set pxe_just_once enabled, but to

re-PXE a system it is then neccessary to zero out the MBR of that system.

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Red Hat SATELLITE 5.3.0 RELEASE NOTES Przewodnik Instalacji Strona 15