LSF Version 7.3 - Platform LSF Configuration Reference

Specify -TAC as the last part of the host name if the host is a TAC and is a DoD host.
Specify the host name in the format defined in Internet RFC 952, which states:
A “name” (Net, Host, Gateway, or Domain name) is a text string up to 24 characters drawn
from the alphabet (A-Z), digits (0-9), minus sign (-), and period (.). Periods are only allowed
when they serve to delimit components of “domain style names”. (See RFC 921, “Domain
Name System Implementation Schedule”, for background). No blank or space characters are
permitted as part of a name. No distinction is made between upper and lower case. The first
character must be an alpha character. The last character must not be a minus sign or a period.
RFC 952 has been modified by RFC 1123 to relax the restriction on the first character being a
digit.
For maximum interoperability with the Internet, you should use host names no longer than
24 characters for the host portion (exclusive of the domain component).
Aliases
Optional. Aliases to the host name.
The default host file syntax
ip_address official_name [alias [alias ...]]
is powerful and flexible, but it is difficult to configure in systems where a single host name has
many aliases, and in multihomed host environments.
In these cases, the hosts file can become very large and unmanageable, and configuration is
prone to error.
The syntax of the LSF hosts file supports host name ranges as aliases for an IP address. This
simplifies the host name alias specification.
To use host name ranges as aliases, the host names must consist of a fixed node group name
prefix and node indices, specified in a form like:
host_name[index_x-index_y, index_m, index_a-index_b]
For example:
atlasD0[0-3,4,5-6, ...]
is equivalent to:
atlasD0[0-6, ...]
The node list does not need to be a continuous range (some nodes can be configured out).
Node indices can be numbers or letters (both upper case and lower case).
For example, some systems map internal compute nodes to single LSF host names. A host file
might contains 64 lines, each specifying an LSF host name and 32 node names that correspond
to each LSF host:
...
177.16.1.1 atlasD0 atlas0 atlas1 atlas2 atlas3 atlas4 ... atlas31
177.16.1.2 atlasD1 atlas32 atlas33 atlas34 atlas35 atlas36 ... atlas63
...
In the new format, you still map the nodes to the LSF hosts, so the number of lines remains
the same, but the format is simplified because you only have to specify ranges for the nodes,
not each node individually as an alias:
...
177.16.1.1 atlasD0 atlas[0-31]
177.16.1.2 atlasD1 atlas[32-63]
...
hosts
Platform LSF Configuration Reference 135