Monitoring Proxmox guests with check mk

This article has two scripts that are needed to monitor te state of VMs runnning on a Proxmox server with check_mk. The scripts come from the Proxmox wiki, but needed adapting to work with check_mk 1.6. If a VM is added or removed do "Full Scan"

The check also collects performance data for %CPU load caused by the VM and % of total memory consumption of the VM as well as it's reserved virtual memory size (VSZ) of the related kvm process.

Client-Check

Place this script on your Proxmox server in /usr/lib/check_mk_agent/plugins/mk_qemu and make sure it's executable.

 #!/bin/bash
 #/usr/lib/check_mk_agent/plugins
 
 # based upon 'qemu' from
 # 12/2010 Matthias Henze
 # Lizenz: GPL v2
 #
 # updated for libvirtd (virsh) by
 # Jonathan Mills 09/2011
 #
 # updated by
 # Christian Burmeister 05/2015
 # updated by
 # adorfer 01/2017 for proxmox 4 pve
 # updated by proxmox 07/2019 for proxmox ve 5&6
 
 if which qm >/dev/null ; then
         echo '<<<qemu>>>'
         qm list | grep -v VMID | while read L
         do
                 if [[ ! -z $L ]]; then
                         
                         ID=$(echo $L | awk '{print $1}')
                         XNAME=$(echo $L | awk '{$1=$NF=$(NF-1)=$(NF-2)=$(NF-3)="";print $0}')
                         NAME=`echo $XNAME | sed 's/ /_/g'`
                         STATE=$(echo $L | awk '{print $(NF-3)}')
                         PID=$(ps aux | grep kvm | grep "id $ID" | head -1 | tail -1| awk '{print $2}')
                         if [[ ! -z $PID ]] && [ "$PID" -gt "0" ]; then
                                 PS=$(ps aux | grep kvm | grep $PID | head -1|tail -1)
                                 MEM=$(echo $PS|awk -- '{print $5}')
                                 MEM=$(echo $MEM / 1024 | bc)
                                 DATA=$(top -p $PID -n 1 -b | tail -1)
                                 PCPU=$(echo $DATA | awk -- '{print $9}'|tr , .)
                                 PMEM=$(echo $DATA | awk -- '{print $10}'|tr , .)
                                 MCPU=$(echo $PS | sed 's/.*maxcpus=\([^ ]*\)\ .*/\1/' )
                                 RCPU=$(echo "scale=1; $PCPU / $MCPU"| bc)
                         else
                                 MEM=""
                                 RCPU=""
                                 PMEM=""
                         fi
                         echo $ID" "$NAME" "$STATE" "$MEM" "$RCPU" "$PMEM 
                 fi
         done
 fi

Plugin

Create the following script on your check_mk server /omd/versions/default/share/check_mk/checks/qemu. Again, make sure it's executable.

 #!/usr/bin/python
 # -*- encoding: utf-8; py-indent-offset: 4 -*-
 
 # based upon 'qemu' from
 # 12/2010 Matthias Henze
 # Lizenz: GPL v2
 #
 # updated for libvirtd (virsh) by
 # Jonathan Mills 09/2011
 #
 # updated by
 # Christian Burmeister 05/2015
 
 # updated by Proxmox 07/2019
 
 
 # Example output from agent:
 # <<<qemu>>>
 # 4 i-4B9008BE running 2048 4.0 2.7
 # 5 i-44F608B6 running 2048 0.0 0.7
 
 # inventory
 def inventory_qemu(info):
     inventory = []
     for line in info:
         if line[2] == "running":  # only VM's running while inventory are monitored !
             vm = line[1] # we want to capture hostname, not vm id here
         # Fix annoying OpenStack misnaming of VMs
         name = vm.split('-')
         if name[0] == "instance":
         name[0] = "i"
         vm = '-'.join(name)
         ##
             inventory.append( (vm, None) )
     return inventory
 
 # check
 def check_qemu(name, param, info):
     for line in info:
         perfdata = []
 
     vm = line[1]
     host = vm.split('-')
     if host[0] == "instance":
         host[0] = "i"
     vm = '-'.join(host)
     
         if vm == name:
             item = line[0]
             status = line[2]
             assigned_mem = line[3]
         infotext = "%s  (id: %s" % (status, item)
 
             if status == "running":
         # 4 i-4B9008BE running 2048 4.0 2.7
                 if len(line) == 6:
             current_cpu = int(round(float(line[4])))
             infotext += ", CPU: %s%%" % (current_cpu)
                     perfdata.append( ( "cpu_%", current_cpu ) )
 
             current_mem = int(round(float(line[5])))
             infotext += ", Memory: (Virtual SiZe: %s MB, used: %s%%" % (assigned_mem ,current_mem)
                     perfdata.append( ( "memory_current_%", current_mem ) )
             perfdata.append( ( "memory__assigned_MB", assigned_mem ) )
 
         infotext += "))"
 
         warn = 80
         if current_cpu > warn or current_mem > warn:
             return (1, "WARN - status is " + infotext, perfdata)
         else:
                     return (0, "OK - status is " + infotext, perfdata)
             else:
         infotext += ")"
                 return (2, "CRITICAL - status is " + infotext, perfdata)
 
     return (3, "UNKNOWN - VM not found in agent output")
 
 # declare the check to Check_MK
 check_info['qemu'] = \
 (check_qemu, "VM %s", 1, inventory_qemu)