Users Guide

40 Setup and Administration
Configuring the SNMP Agent on Systems Running Supported Red Hat Enterprise Linux
Operating Systems
Server Administrator uses the SNMP services provided by the ucd-snmp or net-snmp agent. You can
configure the SNMP agent to change the community name, enable Set operations, and send traps to a
management station. To configure your SNMP agent for proper interaction with management
applications such as IT Assistant, perform the procedures described in the following sections.
NOTE: See your operating system documentation for additional details about SNMP configuration.
SNMP Agent Access Control Configuration
The management information base (MIB) branch implemented by the Server Administrator
Instrumentation Service is identified by the 1.3.6.1.4.1.674.10892.1 OID. Management applications
must have access to this branch of the MIB tree to manage systems running the Instrumentation Service.
For Red Hat Enterprise Linux operating systems, the default SNMP agent configuration gives read-only
access for the "public" community only to the MIB-II "system" branch (identified by the 1.3.6.1.2.1.1
OID) of the MIB tree. This configuration does not allow management applications to retrieve or change
Instrumentation Service or other systems management information outside of the
MIB-II "system" branch.
Server Administrator SNMP Agent Install Actions
If Server Administrator detects the default SNMP configuration during installation, it attempts to
modify the SNMP agent configuration to give read-only access to the entire MIB tree for the "public"
community. Server Administrator modifies the /etc/snmp/snmpd.conf SNMP agent configuration file in
two ways.
The first change is to create a view to the entire MIB tree by adding the following line if it does not exist:
view all included .1
The second change is to modify the default "access" line to give read-only access to the entire MIB tree
for the "public" community. Server Administrator looks for the following line:
access notConfigGroup "" any noauth exact systemview none none
If Server Administrator finds the line above, it modifies the line so that it reads:
access notConfigGroup "" any noauth exact all none none
These changes to the default SNMP agent configuration give read-only access to the entire MIB tree for
the "public" community.
NOTE: To ensure that Server Administrator is able to modify the SNMP agent configuration to provide proper
access to systems management data, it is recommended that any other SNMP agent configuration changes be
made after installing Server Administrator.