LSF Version 7.3 - Platform LSF Configuration Reference

hosts
For hosts with multiple IP addresses and different official host names configured at the system level, this file associates
the host names and IP addresses in LSF.
By default, LSF assumes each host in the cluster:
•
Has a unique “official” host name
•
Can resolve its IP address from its name
•
Can resolve its official name from its IP address
Hosts with only one IP address, or hosts with multiple IP addresses that already resolve to a unique official host name
should not be configured in this file: they are resolved using the default method for your system (for example, local
configuration files like /etc/hosts or through DNS.)
The LSF hosts file is used in environments where:
•
Machines in cluster have multiple network interfaces and cannot be set up in the system with a unique official host
name
•
DNS is slow or not configured properly
•
Machines have special topology requirements; for example, in HPC systems where it is desirable to map multiple
actual hosts to a single “head end” host
The LSF hosts file is not installed by default. It is usually located in the directory specified by LSF_CONFDIR. The
format of LSF_CONFDIR/hosts is similar to the format of the /etc/hosts file on UNIX machines.
hosts file structure
One line for each IP address, consisting of the IP address, followed by the official host name,
optionally followed by host aliases, all separated by spaces or tabs. Each line has the form:
ip_address official_name [alias [alias ...]]
IP addresses can have either a dotted quad notation (IPv4) or IP Next Generation (IPv6)
format. You can use IPv6 addresses if you define the parameter
LSF_ENABLE_SUPPORT_IPV6 in lsf.conf; you do not have to map IPv4 addresses to an
IPv6 format.
Use consecutive lines for IP addresses belonging to the same host. You can assign different
aliases to different addresses.
Use a pound sign (#) to indicate a comment (the rest of the line is not read by LSF). Do not
use #if as this is reserved syntax for time-based configuration.
IP address
Written using an IPv4 or IPv6 format. LSF supports both formats; you do not have to map
IPv4 addresses to an IPv6 format (if you define the parameter LSF_ENABLE_SUPPORT_IPV6
in lsf.conf).
•
IPv4 format: nnn.nnn.nnn.nnn
•
IPv6 format: nnnn:nnnn:nnnn:nnnn:nnnn:nnnn:nnnn:nnnn
Official host name
The official host name. Single character names are not allowed.
Specify -GATEWAY or -GW as part of the host name if the host serves as a GATEWAY.
hosts
134 Platform LSF Configuration Reference