Platform LSF Administration Guide Version 6.2

Chapter 7
Managing Users and User Groups
Administering Platform LSF
161
Existing User Groups as LSF 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
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
/.
Requirements
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