Expose CPU and Memory Information via SNMP

Issue

How do I expose CPU and memory statistics via SNMP? What is the MIB/OID?

Environment

• Cumulus Linux, all versions

Resolution

The relevant OIDs are:

• CPU: .1.3.6.1.4.1.2021.11 (UCD-SNMP-MIB::systemStats)
• Memory: .1.3.6.1.4.1.2021.4 (UCD-SNMP-MIB::memory)

To configure SNMP to expose CPU and memory information:

1. If you did not enable snmpd already, follow instructions in the technical documentation to enable and start snmpd.

2. Allow access to the OIDs by editing /etc/snmp/snmpd.conf. The following example adds the relevant MIBs to the systemonly view.

   ###############################################################################
   #
   #  ACCESS CONTROL
   #
   <CONFIGURATION_TRUNCATED/>
   # Cumulus specific
   view   systemonly  included   .1.3.6.1.4.1.40310.1
   view   systemonly  included   .1.3.6.1.4.1.40310.2
   # Memory utilization
   view   systemonly  included   .1.3.6.1.4.1.2021.4 
   # CPU utilization
   view   systemonly  included   .1.3.6.1.4.1.2021.11
   

3. Restart snmpd to reload the configuration:

   cumulus@switch:~$ sudo service snmpd restart