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)