Get KVM guest information for Mackerel

kvm_guest_dominfo.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
import commands
import datetime

argv = sys.argv
if len( argv ) < 2:
    print "usage " + sys.argv[0] + " info_name"
    sys.exit( -1 )
info_name = sys.argv[1]
unix_time = datetime.datetime.today().strftime('%s')

retval = commands.getstatusoutput( "virsh list --name" )
if retval[0] != 0:
    sys.exit( -1 )

vm_list = retval[1].split( "\n" )
for vm_name in vm_list:
    if vm_name == "":
        continue
    vm_dominfo = commands.getstatusoutput( "virsh dominfo %s | grep -w '%s' | awk -F: '{print $2}'" % ( vm_name, info_name ) )
    if vm_dominfo[0] != 0:
        continue
    vm_status = vm_dominfo[1].strip().split( " " )
    vm_value = vm_status[0]
    if len( vm_status ) > 1 and vm_status[1] == 'KiB':
        vm_value = int( vm_value ) * 1024
    info_metrics_name = info_name.replace( " ", "" ).lower()
    print "%s.%s.%s\t%s\t%s" % ( "kvm.guest", info_metrics_name, vm_name, vm_value, unix_time )

mackerel-agent.conf

# Please append this lines to your config file.
[plugin.metrics.kvm_guest_maxmemory]
command = "/usr/local/bin/kvm_guest_dominfo.py 'Max memory'"
type = "metric"