Monitor MongoDB With SNMP on Linux¶

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Enterprise Feature

SNMP is only available in MongoDB Enterprise.

Overview¶

MongoDB Enterprise can provide database metrics via SNMP, in support of centralized data collection and aggregation. This procedure explains the setup and configuration of a mongod instance as an SNMP subagent, as well as initializing and testing of SNMP support with MongoDB Enterprise.

Considerations¶

Only mongod instances provide SNMP support. mongos and the other MongoDB binaries do not support SNMP.

Configuration Files¶

Changed in version 2.6.

MongoDB Enterprise contains the following configuration files to support SNMP:

MONGOD-MIB.txt:

The management information base (MIB) file that defines MongoDB’s SNMP output.
mongod.conf.subagent:

The configuration file to run mongod as the SNMP subagent. This file sets SNMP run-time configuration options, including the AgentX socket to connect to the SNMP master.
mongod.conf.master:

The configuration file to run mongod as the SNMP master. This file sets SNMP run-time configuration options.

Procedure¶

1

Copy configuration files.¶

Use the following sequence of commands to move the SNMP configuration files to the SNMP service configuration directory.

First, create the SNMP configuration directory if needed and then, from the installation directory, copy the configuration files to the SNMP service configuration directory:

mkdir -p /etc/snmp/
cp MONGOD-MIB.txt /usr/share/snmp/mibs/MONGOD-MIB.txt
cp mongod.conf.subagent /etc/snmp/mongod.conf

The configuration filename is tool-dependent. For example, when using net-snmp the configuration file is snmpd.conf.

By default SNMP uses UNIX domain for communication between the agent (i.e. snmpd or the master) and sub-agent (i.e. MongoDB).

Ensure that the agentXAddress specified in the SNMP configuration file for MongoDB matches the agentXAddress in the SNMP master configuration file.

2

Start MongoDB.¶

Start mongod with the snmp-subagent to send data to the SNMP master.

mongod --snmp-subagent

3

Confirm SNMP data retrieval.¶

Use snmpwalk to collect data from mongod:

Connect an SNMP client to verify the ability to collect SNMP data from MongoDB.

Install the net-snmp package to access the snmpwalk client. net-snmp provides the snmpwalk SNMP client.

snmpwalk -m /usr/share/snmp/mibs/MONGOD-MIB.txt -v 2c -c mongodb 127.0.0.1:<port> 1.3.6.1.4.1.34601

<port> refers to the port defined by the SNMP master, not the primary port used by mongod for client communication.

Optional: Run MongoDB as SNMP Master¶

You can run mongod with the snmp-master option for testing purposes. To do this, use the SNMP master configuration file instead of the subagent configuration file. From the directory containing the unpacked MongoDB installation files:

cp mongod.conf.master /etc/snmp/mongod.conf

Additionally, start mongod with the snmp-master option, as in the following:

mongod --snmp-master

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