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Hrvoje Kusulja
Asked: 2021-12-29 14:19:48 +0800 CST

Configure CollectD SNMP plugin to send performance data to Azure Monitor Log Analytics

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I am trying to get performance from network interfaces from network device (mikrotik, cisco routers etc.) about interface traffic via SNMP poll and send those data to Azure Monitor Log Analytics.

I have installed and working Azure Log Analytics agent on Debian Linux, https://docs.microsoft.com/en-us/azure/azure-monitor/agents/agent-linux and working Syslog monitoring https://docs.microsoft.com/en-us/azure/azure-monitor/agents/data-sources-syslog

However, I am unable to find a good example of CollectD configuration file using SNMP plugin and how to send those performance data to Azure Monitor service https://docs.microsoft.com/en-us/azure/azure-monitor/agents/data-sources-collectd

https://collectd.org/wiki/index.php/Plugin:SNMP

If somebody can share CollectD configuration files using SNMP CollectD plugin and sending this performance data to Azure Monitor? Or how to troubleshoot CollectD service with SNMP plugin? Or any other free software (on Linux or Windows) which can do SNMP pull (and SNMP trap) and supports sending data to Azure Monitor I would be thankful.

snmp collectd oms log-analytics-workspace azure-monitor

1 Answers

  1. This page seems to give clear instructions on how to get CollectD to write to the Azure agent: https://docs.microsoft.com/en-us/azure/azure-monitor/agents/data-sources-collectd

    These pages (here and enter link description here) seem to have pretty clear config with examples for polling various device types.

    Can you share some of the errors that you're encountering? There's also the Linux snmpwalk tool that might help with debugging SNMP? I think I used it a long time ago to set things up, testing all the strings were correct.

    UPDATE:

    I've done the following to test on an EC2 instance so far, and can get CollectD to print out what it finds from SNMP. I'd suggest you get this working and then move on to pushing to Azure.

    1. Boot Amazon Linux
    2. Install net-snmp and net-snmp-utils
    3. Install collectd and collectd-snmp
    4. Create configs
    5. Start snmpd service
    6. Test snmpwalk
    7. Test collectd

    Install Commands:

    amazon-linux-extras install collectd
yum install -y net-snmp net-snmp-utils collectd-snmp

    Config:

    /etc/snmp/snmpd.conf:

    com2sec AllUser default changeme
group AllGroup v2c AllUser
view SystemView included .1.3.6.1.2.1.1
view SystemView included .1.3.6.1.2.1.25.1.1
view AllView included .1
access AllGroup "" any noauth exact AllView none none
syslocation Unknown (edit /etc/snmp/snmpd.conf)
syscontact Root <root@localhost> (configure /etc/snmp/snmp.local.conf)
dontLogTCPWrappersConnects yes

    /etc/collectd.conf:

    Hostname    "localhost"
FQDNLookup   true
BaseDir     "/var/lib/collectd"
PIDFile     "/var/run/collectd.pid"
PluginDir   "/usr/lib64/collectd"
TypesDB     "/usr/share/collectd/types.db"
LoadPlugin logfile

<Plugin logfile>
    LogLevel info
    File STDOUT
    Timestamp true
    PrintSeverity false
</Plugin>

# LoadPlugin cpu
# LoadPlugin interface
# LoadPlugin load
# LoadPlugin memory
LoadPlugin snmp
LoadPlugin write_log

<Plugin snmp>
   <Data "hr_processes">
      Type "gauge"
      Table false
      Instance ""
      Shift -1
      Values "HOST-RESOURCES-MIB::hrSystemProcesses.0"
   </Data>

   <Host "localhost">
       Address "localhost"
       Version 2
       Community "changeme"
       Collect "std_traffic" "hr_processes"
   </Host>
</Plugin>

Include "/etc/collectd.d"

    Command outputs:

    # snmpwalk -v 2c -c changeme -O e localhost | grep hrSystemProcesses
HOST-RESOURCES-MIB::hrSystemProcesses.0 = Gauge32: 95
HOST-RESOURCES-MIB::hrSWRunParameters.32729 = STRING: "--color=auto hrSystemProcesses"

# collectd -f  -C /etc/collectd.conf
[2022-01-11 12:34:32] plugin_load: plugin "logfile" successfully loaded.
[2022-01-11 12:34:32] plugin_load: plugin "snmp" successfully loaded.
[2022-01-11 12:34:32] plugin_load: plugin "write_log" successfully loaded.
[2022-01-11 12:34:32] snmp plugin: No such data configured: `std_traffic'
[2022-01-11 12:34:32] Initialization complete, entering read-loop.
[2022-01-11 12:34:32] write_log values:
localhost.snmp.gauge 94 1641904472

^C[2022-01-11 12:34:34] Exiting normally.
[2022-01-11 12:34:34] collectd: Stopping 5 read threads.
[2022-01-11 12:34:34] collectd: Stopping 5 write threads.
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