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File name

tftpboot/profiles/castor/fsimage

tftpboot/profiles/castor/kernel

tftpboot/pxelinux.cfg/default

For additional information regarding the use of the PXELINUX boot loader, refer to the included

documentation and ZIP file in the samples/Network-Boot directory on the DX Storage

distribution media.

2.4.2.4. DHCP and Boot Server Redundancy

To eliminate a single point of failure if your DHCP server goes offline, you must configure both

primary and secondary DHCP servers. Details on the necessary steps to set up the ISC DHCP

daemon for redundancy can be found in the following article:

failover/

To provide redundancy at the network booting layer, your primary and secondary DHCP servers can

be used as TFTP servers as well. In their setups, set the next-server parameter specify to their

own IP address. This way, whichever DHCP server answers the DHCP query will also be the server

that handles the PXE boot. To prevent any network interruptions, the TFTP boot server(s) should

be on the same broadcast domain (that is, VLAN) as the DX Storage nodes, or you should enable a

DHCP relay server on the VLAN.

2.5. Setting Up a Configuration File Server

Note

If you boot from a CSN, the tasks discussed in this section are not necessary or

recommended. Your system is already set up to PXE boot from the CSN.

DX Storage supports centralizing the node configuration files on an HTTP or FTP server. This

method of booting can be used with network booting or with standard USB flash drive booting.

A centralized configuration server simplifies the administration of large DX Storage clusters by

allowing configuration file updates and by providing a method to group configurations of similar

nodes.

To use a configuration file server, set the value of the castor_cfg kernel configuration parameter

to a URL that specifies the configuration list file. For details, see one of the following examples:

• PXE boot example.

Following is an example PXELINUX configuration file from the tftpboot/pxelinux.cfg

directory on the TFTP boot server.

default profiles/castor/kernel

append initrd=profiles/castor/fsimage

ramdisk_size=128000 root=/dev/ram0

castor_cfg=http://172.16.1.200/castor/cfg-list.txt

Note

The append command must be entered on a single line. It is shown here on multiple

lines because of space limitations.

Description

DX Storage software

DX Storage operating system kernel

PXELINUX configuration file

http://www.madboa.com/geek/dhcp-

Version 5.0

December 2010