sysdb

sysdb is a simple database holding information relevant to system deployment, including

a MAC to FQDN mapping
whether to boot from local disk or install
if installation is requested, which distribution/release to install
which environment a system belongs to, and who can manage the environment
arbitrary key-value pairs which can be used to store additional information like the Puppet role of a system.

sysdb runs on the boot server, ie. boot00.psi.ch (production) and boot00-test.psi.ch (testing).