Administration; Clustering; Accessing The Pos Terminals - Novell SLRS 8 Admin Manual

2.2.3 Administration

No system administration other than emergency handling is necessary on the
BS. All administrative tasks are controlled from the central AS and are ex-
ecuted regularly by scripts run by the cron scheduler. For emergencies and
debugging, all functionality can be triggered locally or via SSH login by call-
ing scripts with no or few command line parameters. The functionalities are
described in the following sections.
POS CR Setup
Set up all or one single cash register and local service configuration files (PXE
configuration, /etc/syslog.conf, etc.) and image files for the boot process of
the cash registers. The following functions are provided:
Boot configuration: Create the DHCP entry and PXE configuration file
for cash registers.
DNS: Create the zone file and configuration file for BIND name server.
Config Files: Create configuration files for download by the POS sys-
tems.
Image Update
Trigger the rsync update process of downloading new image files from the
administration server.
Software Layering
All SLRS tools for the BS and the AS consist of a high-level script ("call wrap-
per") that combines defaults, command line parameters, and environment
variables, reads data from LDAP, then calls low-level scripts.

2.2.4 Clustering

The BS systems are two-node heartbeat clusters. The configuration data (dhcp
leases) and application data (cash register application database back-end ta-
bles) is synchronized with DRBD. Software transport "pull" procedures from
the AS run on both cluster nodes.

2.2.5 Accessing the POS Terminals

It is possible to distribute SSH public keys to the authorized_keys files of the
POS terminals root user. By default, no keys are distributed, disabling login to
the POS terminals.
2.2 Branch Server
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