EC2 instance meta-data via SNMP

Here is a simple script and a sample snmp.conf file which will enable you to query your EC2 instance meta-data via SNMP. For more information on meta-data, see (see page 49 EC2 Developers Guide ).

metadata.py

#!/usr/bin/python
# This script returns metadata specific to AWS instances
# See Page 49, Amazon Elastic Compute Cloud - Developer Guide

from httplib import HTTPConnection
from sys import argv
import socket

if len(argv) > 1:
     try:
          conn = HTTPConnection("169.254.169.254")
          url = "/latest/meta-data/" + str(argv[1])
          conn.request("GET",url)
          r1 = conn.getresponse()
          if r1.status == 200:
               print r1.read()
          else:
               print r1.status,url
     except socket.error,msg:
         print msg[1] 
else:
     print "data key missing"

snmp.conf

rwcommunity EDF9ErIfzNFb 127.0.0.1
rocommunity public

syscontact user@host.com
syslocation AWS

com2sec notConfigUser default public
group notConfigGroup v1 notConfigUser
group notConfigGroup v2c notConfigUser

# RFC1213-MIB.iso.org.dod.internet.mgmt.mib-2
view systemview included .1.3.6.1.2.1.1
view systemview included .1.3.6.1.2.1.2

# HOST-RESOURCES-MIB.iso.org.dod.internet.mgmt.mib-2.host
view systemview included .1.3.6.1.2.1.25 view systemview included .1.3.6.1.2.1.25.1.1

# UCD-SNMP-MIB.iso.org.dod.internet.private.enterprises.ucdavis
view systemview included .1.3.6.1.4.1.2021

access notConfigGroup "" any noauth exact systemview none none

# Added for support of bcm5820 cards.
pass .1.3.6.1.4.1.4413.4.1 /usr/bin/ucd5820stat

#agentaddress 192.168.8.103

# Executable Scripts
# AWS Specific
exec ami-id /etc/snmp/aws_metadata.sh ami-id
exec ami-launch-index /etc/snmp/aws_metadata.sh ami-launch-index
exec ami-manifest-path /etc/snmp/aws_metadata.sh ami-manifest-path
exec ancestor-ami-ids /etc/snmp/aws_metadata.sh ancestor-ami-ids
exec block-device-mapping /etc/snmp/aws_metadata.sh block-device-mapping
exec instance-id /etc/snmp/aws_metadata.sh instance-id
exec instance-type /etc/snmp/aws_metadata.sh instance-type
exec local-hostname /etc/snmp/aws_metadata.sh local-hostname
exec local-ipv /etc/snmp/aws_metadata.sh local-ipv4
exec kernel-id /etc/snmp/aws_metadata.sh kernel-id
exec availability-zone /etc/snmp/aws_metadata.sh availability-zone
#exec product-codes /etc/snmp/aws_metadata.sh product-codes
exec public-hostname /etc/snmp/aws_metadata.sh public-hostname
exec public-ipv4 /etc/snmp/aws_metadata.sh public-ipv4
#exec public-keys /etc/snmp/aws_metadata.sh public-keys
exec ramdisk-id /etc/snmp/aws_metadata.sh ramdisk-id
exec reservation-id /etc/snmp/aws_metadata.sh reservation-id
exec security-groups /etc/snmp/aws_metadata.sh security-groups

# Disk Checks
disk /

# Process Checks
proc crond
proc ntpd
proc rsyslogd
proc sshd

Sample Output

[root@ami1 ~]# snmpwalk -Os -c public -v 2c localhost .1.3.6.1.4.1.2021.8.1.101.1
extOutput.1 = STRING: ami-08f41161

[root@ami1 ~]# snmpwalk -Os -c public -v 2c localhost .1.3.6.1.4.1.2021.8.1.101.2
extOutput.2 = STRING: 101

Hope this helps!
VVK