Administering Platform LSF - SAS

Hosts with Multiple Addresses
Example /etc/hosts entries
No unique official
name
Both addresses
have the same
official name
The following example is for a host with two interfaces, where the host does
not have a unique official name.
# Address Official name Aliases
# Interface on network A
AA.AA.AA.AA host-AA.domain host.domain host-AA host
# Interface on network B
BB.BB.BB.BB host-BB.domain host-BB host
Looking up the address AA.AA.AA.AA finds the official name host-
AA.domain. Looking up address BB.BB.BB.BB finds the name host-
BB.domain. No information connects the two names, so there is no way for
LSF to determine that both names, and both addresses, refer to the same host.
To resolve this case, you must configure these addresses using a unique host
name. If you cannot make this change to the system file, you must create an
LSF hosts file and configure these addresses using a unique host name in that
file.
Here is the same example, with both addresses configured for the same official
name.
# Address Official name Aliases
# Interface on network A
AA.AA.AA.AA host.domain host-AA.domain host-
AA host
# Interface on network B
BB.BB.BB.BB host.domain host-BB.domain host-
BB host
With this configuration, looking up either address returns host.domain as the
official name for the host. LSF (and all other applications) can determine that
all the addresses and host names refer to the same host. Individual interfaces
can still be specified by using the host-AA and host-BB aliases.
Sun’s NIS uses the /etc/hosts file on the NIS master host as input, so the
format for NIS entries is the same as for the /etc/hosts file.
Since LSF can resolve this case, you do not need to create an LSF hosts file.
DNS configuration
The configuration format is different for DNS. The same result can be produced
by configuring two address (A) records for each Internet address. Following
the previous example:
# name class type address
host.domain IN A AA.AA.AA.AA
host.domain IN A BB.BB.BB.BB
host-AA.domain IN A AA.AA.AA.AA
host-BB.domain IN A BB.BB.BB.BB
Looking up the official host name can return either address. Looking up the
interface-specific names returns the correct address for each interface.
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Administering Platform LSF