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#!/usr/bin/python
# -*- coding: utf-8 -*-
# vim: set fileencoding=utf-8
#
# Munin plugin to show io by vm
#
# Copyright Maxence Dunnewind, Rodolphe Quiédeville
#
# License : GPLv3
#
# parsed environment variables:
# vmsuffix: part of vm name to be removed
#
#%# capabilities=autoconf
#%# family=contrib
import re, os, sys
from subprocess import Popen, PIPE
def config(vm_names):
''' Print the plugin's config
@param vm_names : a list of "cleaned" vms' name
'''
base_config = """graph_title KVM Virtual Machine IO usage
graph_vlabel Bytes read(-)/written(+) per second
graph_category KVM
graph_info This graph shows the block device I/O used of virtual machines
graph_args --base 1024"""
print base_config
for vm in vm_names:
print "%s_read.label %s" % (vm, vm)
print "%s_read.type COUNTER" % vm
print "%s_read.min 0" % vm
print "%s_read.draw LINE1" % vm
print "%s_read.info I/O used by virtual machine %s" % (vm, vm)
print "%s_write.label %s" % (vm, vm)
print "%s_write.type COUNTER" % vm
print "%s_write.min 0" % vm
print "%s_write.draw LINE1" % vm
print "%s_write.negative %s_read" % (vm, vm)
print "%s_write.info I/O used by virtual machine %s" % (vm, vm)
def clean_vm_name(vm_name):
''' Replace all special chars
@param vm_name : a vm's name
@return cleaned vm's name
'''
# suffix part defined in conf
suffix = os.getenv('vmsuffix')
if suffix:
vm_name = re.sub(suffix,'',vm_name)
return re.sub(r"[^a-zA-Z0-9_]", "_", vm_name)
def fetch(vms):
''' Fetch values for a list of pids
@param dictionnary {kvm_pid: cleaned vm name}
'''
res = {}
for pid in vms:
f = open("/proc/%s/io" % pid, "r")
for line in f.readlines():
if "read_bytes" in line:
read = line.split()[1]
print "%s_read.value %s" % (vms[pid], read)
if "write_bytes" in line:
write = line.split()[1]
print "%s_write.value %s" % (vms[pid], write)
break
f.close()
def detect_kvm():
''' Check if kvm is installed
'''
kvm = Popen("which kvm", shell=True, stdout=PIPE)
kvm.communicate()
return not bool(kvm.returncode)
def find_vm_names(pids):
'''Find and clean vm names from pids
@return a dictionnary of {pids : cleaned vm name}
'''
result = {}
for pid in pids:
cmdline = open("/proc/%s/cmdline" % pid, "r")
result[pid] = clean_vm_name(re.sub(r"^.*-name\x00([a-zA-Z0-9.-]*)\x00\-.*$",r"\1", cmdline.readline()))
return result
def list_pids():
''' Find the pid of kvm processes
@return a list of pids from running kvm
'''
pid = Popen("pidof qemu-kvm kvm", shell=True, stdout=PIPE)
return pid.communicate()[0].split()
if __name__ == "__main__":
if len(sys.argv) > 1:
if sys.argv[1] in ['autoconf', 'detect']:
if detect_kvm():
print "yes"
else:
print "no"
elif sys.argv[1] == "config":
config(find_vm_names(list_pids()).values())
else:
fetch(find_vm_names(list_pids()))
else:
fetch(find_vm_names(list_pids()))
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