Juniper SRX Chassis Cluster RG0 Nagios Check

I was required to check (as this customer did not have a trap collector) which node was active for redundancy group 0 on a SRX cluster. So I thought I would check for a SNMP OID that is only presented by the active RG0 node. This script uses snmpwalk and is configured to use SNMP v2c (this can be easily changed). It has been tested on:

  • CentOS 5
  • Junos 11.4R2
  • SNMP v2c

Here is the little hacky shell script:

[bash]
#!/bin/bash

# Cooper Lees <me@cooperlees.com>
# Dirty Cluster RG0 checker
# Lasted Updated: 20120818

HOST=$1
COMMUNITY=$2

if [ "$HOST" == "" ] || [ "$COMMUNITY" == "" ]; then
echo "ERROR: No host or SNMP community specified"
exit 2
fi

SNMPOUTPUT=$(snmpwalk -v 2c -c $COMMUNITY $HOST 1.3.6.1.4.1.2636.3.1.14.1.7)

echo $SNMPOUTPUT | grep "INTEGER: 2" > /dev/null
if [ $? == 0 ]; then
echo "Host $HOST is the Chassis cluster ACTIVE RE"
exit 0
fi

echo $SNMPOUTPUT | grep "No Such Object available on this agent at this OID" > /dev/null
if [ $? == 0 ]; then
echo "Host $HOST is the INACTIVE RE"
exit 2
fi

echo "WTF – Something is not right …"
exit 3
[/bash]

It checks for the “jnxRedundancyState” OID – this OID reports on RE states and is only accurate on Junos routers (e.g. M and MX series etc.).

Enjoy …