The Simple Network Management Protocol service is available to users of the 3.2 release of the IBM General Parallel File System. It allows users to perform SNMP service collection from a defined Linux OS collector node in the GPFS cluster to a management node. In conjunction with Net-SNMP installed on the collector node and with the mmsnmpagentd service running, the user can capture SNMP trap information for monitoring and analysis on the management node. (Net-SNMP is a suite of applications used to implement SNMP v1, SNMP v2c, and SNMP v3 using both IPv4 and IPv6.) For more information on SNMP in GPFS 3.2, including a complete listing of the types of data that can be collected, refer to the General Parallel File System Advanced Administration Guide, Version 3 Release 2 (see Resources for a link).
This article shows you how to verify the SNMP functionality in a GPFS cluster. Figure 1 is an overview of the SNMP verification process.
Figure 1. Overview of SNMP verification process
To verify the SNMP functionality in a GPFS cluster, you need:
- GPFS 3.2 or later
- Net-SNMP (preferably version 5.4.1)
- A node/lpar running Linux in the GPFS cluster as the collector node
- A management node (also running Linux in this verification procedure)
Setting up and verifying the SNMP agent
The following 12 steps show you how to initially set up and verify the SNMP agent on the collector and manager nodes.
1. Choose the collector node
Pick a GPFS cluster node to be the collector node. This is the node where the SNMP sub-agent will run, the node that will collect and report GPFS SNMP information to an SNMP management node/application.
2. Choose the management node
Pick a node to be the SNMP management node. This is the node where a sysadmin will run an SNMP management application such as NetView® or OpenNMS. (An off-cluster choice is more realistic, but you could even choose the same node as the collector node.)
3. Install Net-SNMP on nodes
Both the collector node and management node should have Net-SNMP installed:
rpm -qa | grep net-snmp.
4. Edit the SNMP daemon operating parameters
On the collector node, edit the file /etc/snmp/snmpd.conf. This file defines the operating parameters of the master SNMP daemon. Include the following lines:
master agentx trap2sink [HOSTNAME or IP ADDRESS of MANAGEMENT NODE] AgentXSocket tcp:localhost:705 AgentXTimeout 20 AgentXRetries 10
5. Edit general SNMP information
On the collector node and the management node, edit the /etc/snmp/snmp.conf
file. This file determines general SNMP information for applications on the node.
Include the following line:
6. Copy the GPFS MIB definition
On the collector node and the management node, copy the GPFS MIB definition to the directory /usr/share/snmp/mibs:
cp /usr/lpp/mmfs/data/GPFS-MIB.txt /usr/share/snmp/mibs rcp /usr/lpp/mmfs/data/GPFS-MIB.txt managementnode:/usr/share/snmp/mibs
If the MIB definition file changes in the GPFS build images, repeat this step.
7. Enable the SNMP daemon to grab the new configuration
On the collector node, stop and start the SNMP daemon (also known as the SNMP master agent or snmpd) so that it picks up the configuration changes:
SUSE: /etc/rc.d/snmpd stop SUSE: /etc/rc.d/snmpd start Redhat: ps -ef | grep snmpd Redhat: kill [/usr/sbin/snmpd PID] Redhat: /usr/sbin/snmpd
Verify that the SNMP daemon is running:
ps -ef | grep snmpd. Check dmesg and /var/log/snmpd.log
for any bad news.
8. Start receiving SNMP traps
On the management node, open a window and run the command to begin to receive
/usr/sbin/snmptrapd -Lo -t -f.
9. Enable the GPFS SNMP sub-agent
On any node in the GPFS cluster, turn on the GPFS SNMP sub-agent:
mmchnode --snmp-agent -N [COLLECTOR-NODE].
10. Verify that the sub-agent is running
On the collector node, verify that the GPFS SNMP sub-agent is running:
ps -ef | grep mmsnmpagentd.
If you don't see it running, make sure GPFS is running, make sure snmpd is running, and check /var/adm/ras/mmfs.log.latest for any diagnostic messages.
11. See if you caught anything in your trap
On the management node, see if the
GPFS-MIB::gpfsNewConnectionTrap trap was caught (it
takes about 20 seconds for the sub-agent to collect its initial information).
12. Query the collector node for GPFS SNMP info
On the management node, query the collector node for GPFS SNMP info:
snmpwalk -t 10 -r 10 -c public [COLLECTOR-NODE] ibmGPFS.
Verify that the information is correct; typical results are shown below.
The following samples demonstrate what you should see. Listing 1 shows output for
a typical trap capture with
snmptrapd; Listing 2 shows
typical GPFS cluster information gathered from
Listing 1. A typical trap capture with snmptrapd
NET-SNMP version 5.4 2007-10-26 13:29:40 <UNKNOWN> [UDP: [126.96.36.199]:56357]: DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (46843) 0:07:48.43 SNMPv2-MIB::snmpTrapOID.0 = OID: GPFS-MIB::gpfsStgPoolUtilizationTrap GPFS-MIB::gpfsStgPoolFSName = STRING: "gpfs5" GPFS-MIB::gpfsStgPoolName = STRING: "system" GPFS-MIB::gpfsStgPoolUtil = Gauge32: 91 2007-10-26 13:31:16
Listing 2 shows typical GPFS cluster information gathered from
Listing 2. Typical GPFS cluster information gathered from snmpwalk
GPFS-MIB::gpfsDiskData."gpfs4"."SP4gpfs1"."GPFSNSD20" = STRING: "y" GPFS-MIB::gpfsDiskData."gpfs4"."SP4gpfs1"."GPFSNSD21" = STRING: "y" GPFS-MIB::gpfsDiskData."gpfs4"."SP4gpfs1"."GPFSNSD22" = STRING: "y" GPFS-MIB::gpfsDiskData."gpfs4"."SP4gpfs1"."GPFSNSD23" = STRING: "y" GPFS-MIB::gpfsDiskData."gpfs5"."system"."GPFSNSD24" = STRING: "y" GPFS-MIB::gpfsDiskData."gpfs5"."SP5gpfs1"."GPFSNSD30" = STRING: "y" GPFS-MIB::gpfsDiskData."gpfsuser"."system"."GPFSNSD28" = STRING: "y" GPFS-MIB::gpfsDiskData."gpfsuser"."SP5gpfs1"."GPFSNSD26" = STRING: "y" GPFS-MIB::gpfsDiskData."gpfsuser"."SP5gpfs1"."GPFSNSD27" = STRING: "y"
- In "Setting up a multicluster environment using General Parallel File System" (developerWorks, May 2007), learn about the role GPFS plays in clustering.
- The "Installing a large Linux cluster" series (developerWorks, December 2006 to June 2007) covers Linux cluster topics like GPFS and SNMP.
- The "High-performance Linux clustering" series (developerWorks, September 2005) looks at high performance computing with Linux systems. Also, the "Installing a large Linux cluster" series can answer many of your multi-node Linux questions.
- Learn more about GPFS 3.2 in the IBM Cluster information center. In particular, Chapter 7 of the General Parallel File System Advanced Administration Guide, Version 3 Release 2 provides a thorough overview of the SNMP capabilities.
Net-SNMP page on SourceForge
tutorial on using Net-SNMP traps
documentation on snmpwalk
(which lets you retrieve a subtree of management values using SNMP
- In the developerWorks Linux zone, find more resources for Linux developers, and scan our most popular articles and tutorials.
- See all Linux tips and Linux tutorials on developerWorks.
- Stay current with developerWorks technical events and Webcasts.
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