Disk Monitoring with OpenNMS

monitoringnetwork-monitoringopennmswindows-server-2008

I'm sure this has been asked before (and actually all over the net) but I'm scratching my head a little over this. OpenNMS is installed on my 2008R2 server and is picking up my nodes fine (detecting some limited serivces etc). Ideally I woud like to kick start this and get it monitoring disk space and thresholds etc. (similar to Kaseya) but all I can find on their site and other forums are references to this NET-SNMP installer and config which there appears to be a real lack of detail explaining what I need to do with this/whether I do need it etc

Anyone with any experience with this interesting monitoring software please give us a shout!

Many thanks,

T.C

Best Answer

For Windows, the approach is the same as for Linux. OpenNMS needs to be configured to operate on specific SNMP community names. For your Windows servers, you need to enable and configure SNMP by adding the role/service and defining the community name and IP addresses allowed to reach the server. Restart the SNMP service when you're done.

On the OpenNMS side, you have to tell OpenNMS what SNMP communities correspond to which IP address/ranges.

In the OpenNMS web interface, navigate to Admin > Configure SNMP by IP.
Enter the IP range of your devices.
Enter an SNMP community string.
Click Submit

enter image description here

Once done, go to the specific nodes and select the rescan link to discover the node's SNMP information. Disk information is presented by default.

Related Solutions

How does one go about monitoring memcached stats in OpenNMS

Create the following script (and make it executable):

#!/bin/bash
exec 5<> /dev/tcp/127.0.0.1/11211
if [ $? -eq 0 ]; then
        echo "stats" >&5
        echo "quit" >&5
        while read -u 5 -d $'\r' stat name value;
        do
                echo $value
        done
        exit 0
fi
exit 1

Mine is /usr/local/bin/memcached_stats.sh

It connects to the memcached daemon and spits out a sanitized version of the memcached stats command and output something like:

2754
2129139
1243545563
1.2.2
64
2299.898362
7336.774640
217721
7091925
1909177049
108
27653
633
234138327
7091925
220430936
13707391
352833
89610818966
1385141563315
2147483648
4

Add the following to your /etc/snmp/snmpd.conf and restart snmpd:

extend .1.3.6.1.4.1.1.900.100 memcached /usr/local/bin/memcached_stats.sh

This creates a table based on the output of the script where each line gets its own node.

If you want to confirm this run the following:

snmpwalk -v2c -c public 127.0.0.1 .1.3.6.1.4.1.1.900.100

You should get something like:

SNMPv2-SMI::enterprises.1.900.100.3.1.3.9.109.101.109.99.97.99.104.101.100 = INTEGER: 23
SNMPv2-SMI::enterprises.1.900.100.3.1.4.9.109.101.109.99.97.99.104.101.100 = INTEGER: 0
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.1 = STRING: "2754"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.2 = STRING: "2123005"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.3 = STRING: "1243539429"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.4 = STRING: "1.2.2"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.5 = STRING: "64"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.6 = STRING: "2290.369810"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.7 = STRING: "7308.630919"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.8 = STRING: "217652"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.9 = STRING: "7066934"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.10 = STRING: "1909286395"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.11 = STRING: "108"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.12 = STRING: "27628"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.13 = STRING: "633"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.14 = STRING: "233251848"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.15 = STRING: "7066934"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.16 = STRING: "219593496"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.17 = STRING: "13658352"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.18 = STRING: "348593"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.19 = STRING: "89233569948"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.20 = STRING: "1380956068373"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.21 = STRING: "2147483648"
SNMPv2-SMI::enterprises.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.22 = STRING: "4"

From that you can extrapolate which node is which stat, but lucky for you I've done all that already.

In datacollection-config.xml add the following to the top, but after all the rrd config:

<resourceType name="MemcachedStats" label="memcached stats" resourceLabel="memcached">
    <persistenceSelectorStrategy class="org.opennms.netmgt.collectd.PersistAllSelectorStrategy"/>
    <storageStrategy class="org.opennms.netmgt.dao.support.IndexStorageStrategy"/>
</resourceType>

Then in the groups section add the following:

<group name="memcached_stats" ifType="all">
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.1" instance="MemcachedStats" alias="pid" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.2" instance="MemcachedStats" alias="uptime" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.3" instance="MemcachedStats" alias="time" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.4" instance="MemcachedStats" alias="version" type="string" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.5" instance="MemcachedStats" alias="pointer_size" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.4" instance="MemcachedStats" alias="rusage_user" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.7" instance="MemcachedStats" alias="rusage_system" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.8" instance="MemcachedStats" alias="curr_items" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.9" instance="MemcachedStats" alias="total_items" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.10" instance="MemcachedStats" alias="bytes" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.11" instance="MemcachedStats" alias="curr_connections" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.12" instance="MemcachedStats" alias="total_connections" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.13" instance="MemcachedStats" alias="connection_structures" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.14" instance="MemcachedStats" alias="cmd_get" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.15" instance="MemcachedStats" alias="cmd_set" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.16" instance="MemcachedStats" alias="get_hits" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.17" instance="MemcachedStats" alias="get_misses" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.18" instance="MemcachedStats" alias="evictions" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.19" instance="MemcachedStats" alias="bytes_read" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.20" instance="MemcachedStats" alias="bytes_written" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.21" instance="MemcachedStats" alias="limit_maxbytes" type="integer" />
    <mibObj oid=".1.3.6.1.4.1.1.900.100.4.1.2.9.109.101.109.99.97.99.104.101.100.22" instance="MemcachedStats" alias="threads" type="integer" />
</group>

And finally further down you want to find the systemDef tags for Net-SNMP & Net-SNMP (UCD) and add the following within the collect tags:

<includeGroup>memcached_stats</includeGroup>

Restart OpenNMS and and there you have it... when capsd rescans the hosts it'll start gathering these statistics

Below is a reference for the data that can be got from memcached:

pid: process id of this serverprocess
uptime: number of seconds this server has been running
time: current UNIX time according to the server
version: version string of this server
pointer_size: default size of pointers on the host OS
rusage_user: accumulated user time for this process
rusage_system: accumulated system time for this process
curr_items: current number of items stored by the server
total_items: total number of items stored by this server ever since it started
bytes: current number of bytes used by this server to store items
curr_connections: number of open connections
total_connections: total number of connections opened since the server started running
connection_structures: number of connection structures allocated by the server
cmd_get: cumulative number of retrieval requests
cmd_set: cumulative number of storage requests
get_hits: number of keys that have been requested and found present
get_misses: number of items that have been requested and not found
evictions: number of valid items removed from cache to free memory for new items
bytes_read: total number of bytes read by this server from network
bytes_written: total number of bytes sent by this server to network
limit_maxbytes: number of bytes this server is allowed to use for storage
threads: number of worker threads requested

All that is left is to build whatever graphing or reporting you'd like.

(Works on CentOS 5.2, OpenNMS 1.5.93-1, net-snmp 5.3.1, memcached 1.2.2)

Can OpenNMS show me all currently exceeded thresholds

It seems other people have had the same itch to scratch: OpenNMS Enhancement request, and subsequent blog post about it. I haven't installed this, so can't comment on how easy it is to add to the current 1.8 branch.

Best Answer

Related Solutions

How does one go about monitoring memcached stats in OpenNMS

Can OpenNMS show me all currently exceeded thresholds

Related Topic