Server Configuration And Server Services; Dns; Dhcp; Tftp - Novell SLRS 8 Admin Manual

4.4 Server Configuration and Server Services
The procedure is similar for CR hardware. Here, in addition to the referenced
hardware type (through attribute scRefPcDn to a scCashRegister object), a
reference image is pointed to via scPosImageDn to a scPosImage object.
The scRefObjectContainer container objects should, by definition, always
have cn=global and also appear only once per directory level. The initial
LDAP structure after installation includes only one scRefObjectContainer
named global under the directory root. Following the above described logic,
other scRefObjectContainer objects can be added as needed. This provides
great flexibility. For example, each server can be assigned its own reference
objects and therefore its own hardware types. However, if all the servers have
the same hardware, a blanket standard can be defined for branches on the
regional or organizational level in the global container.
4.4 Server Configuration and Server Services
The services for both the administration servers and the branch servers can be
designed to be highly available. To meet this requirement, either the generic
mechanisms of the server services (DNS, DHCP, etc.) are used or a combina-
tion of heartbeat, virtual IP, and drbd is employed. An automatic installation
option is being implemented for the branch servers so new branches can be
set up at minimal expense. AutoYaST2 is used in this case and the description
files will be generated from the directory data.
The administration server runs the directory service and the RSYNC server.
The branch servers run all the services required to start the cash registers
(TFTP, DHCP, DNS) for the respective branch and an NTP server that synchro-
nizes the system time with the administration server.

4.4.1 DNS

Every branch server runs a DNS master for that branch. The zone files are
generated on each branch server by the posldap2dns script from the data in
the LDAP directory and reloaded.

4.4.2 DHCP

A DHCP server is installed on the branch server. The dhcpd.conf file is gener-
ated by the posldap2dhcp script from the directory data for the branches.

4.4.3 TFTP

The TFTP service on the branch server is structured as described above with
boot, image, CR, and upload directories. There is a PXE default configuration
with which all the CRs first load the same initial initrd and the same kernel.
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