Dell 3-DNS, Administrator'S Manual

Page: 48 / 165

Chapter 3
3 - 6
Host name
The host name identifies the 3-DNS Controller itself. Host names must be
fully qualified domain names (FQDNs). The host portion of the name must
start with a letter, and must be at least two characters. The FQDN must be
less than or equal to 256 characters, but not less than 1 character. Each label
part of the name must be 63 characters or fewer. Only letters, numbers, and
the characters underscore (
_ ), dash ( - ), and period ( . ) are allowed. For
example:
<host 63 characters or less>.<label 63 characters or less>.net
You should only change the host name of the system with the Setup utility.
Editing
/etc/hosts , or using the hostname command to change the host name
renders the system inaccessible.
Redundant system settings
There are three types of settings you need to define for redundant systems:
unit IDs, fail-over IP addresses, and fail-over type.
Unit IDs
The default unit ID number is 1 . If this is the first unit in the redundant
system, use the default. When you configure the second unit in the system,
type
2 . These unit IDs are used for active-active redundant configuration.
Choosing a fail-over IP address
A fail-over IP address is the IP address of the unit that takes over if the
current unit fails. Type in the IP address configured on the internal interface
of the other 3-DNS unit in the redundant system.
Fail-over type
There are two types of fail-over to choose from: hard-wired fail-over, and
network fail-over. Choose hard-wired fail-over if you plan to connect the
units together with the fail-over cable provided with the redundant system.
Choose network fail-over if you plan to use the network that the units are
connected to for fail-over functionality.
Note
Hard-wired fail-over is only available if the platform supports hard-wired
fail-over.