Administering Platform LSF - SAS

Existing User Groups as LSF User Groups
Chapter 7
Managing Users and User Groups
User groups already defined in your operating system often reflect existing
organizational relationships among users. It is natural to control computer
resource access using these existing groups.
You can specify existing UNIX user groups anywhere an LSF user group can
be specified.
How LSF recognizes UNIX user groups
Requirements
Only group members listed in the /etc/group file or the file group.byname
NIS map are accepted. The user’s primary group as defined in the
/etc/passwd file is ignored.
The first time you specify a UNIX user group, LSF automatically creates an LSF
user group with that name, and the group membership is retrieved by
getgrnam(3) on the master host at the time mbatchd starts. The membership
of the group might be different from the one on another host. Once the LSF
user group is created, the corresponding UNIX user group might change, but
the membership of the LSF user group is not updated until you reconfigure LSF
(badmin). To specify a UNIX user group that has the same name as a user, use
a slash (/) immediately after the group name: group_name/.
UNIX group definitions referenced by LSF configuration files must be uniform
across all hosts in the cluster. Unexpected results can occur if the UNIX group
definitions are not homogeneous across machines.
How LSF resolves users and user groups with the same name
If an individual user and a user group have the same name, LSF assumes that
the name refers to the individual user. To specify the group name, append a
slash (/) to the group name.
For example, if you have both a user and a group named admin on your
system, LSF interprets admin as the name of the user, and admin/ as the name
of the group.
Where to use existing user groups
Existing user groups can be used in defining the following parameters in LSF
configuration files:
◆ USERS in lsb.queues for authorized queue users
◆ USER_NAME in lsb.users for user job slot limits
◆ USER_SHARES (optional) in lsb.hosts for host partitions or in
lsb.queues or lsb.users for queue fairshare policies
Administering Platform LSF 131