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HV Monitor

HV Monitor provides a generic way to monitor hypervisors. Currently CBSD+bhyve on FreeBSD and Libvirt+QEMU on Linux are support.

For more information see HV::Monitor on Github or MetaCPAN.

SNMP Extend

  1. Install the SNMP Extend.

    apt-get install libjson-perl libmime-base64-perl cpanminus
cpanm HV::Monitor

    pkg install p5-App-cpanminus p5-JSON p5-MIME-Base64 p5-Module-List
cpanm HV::Monitor

    cpanm JSON MIME::Base64 Module::List

  2. Set it up to be be ran by cron by root. Yes, you can directly call this script from SNMPD, but be aware, especially with Libvirt, there is a very real possibility of the snmpget timing out, especially if a VM is spinning up/down as virsh domstats can block for a few seconds or so then.

    */5 * * * * /usr/local/bin/hv_monitor > /var/cache/hv_monitor.json -c 2> /dev/null

  3. Setup snmpd.conf as below.

    extend hv-monitor /bin/cat
/var/cache/hv_monitor.json

  4. Restart SNMPD.

  5. Either wait for it to be re-discovered or manually enable it.