Monitoring /proc/user beancounters with nagios

2008-10-28T19:10:39Z

Kbrandt:

{{DISPLAYTITLE:Monitoring /proc/user_beancounters with nagios}}
To be added locally on the VZ HN to <code>/etc/nagios/nrpe_local.conf</code>.

Works as nagios-plugin with option '-f' or reports an increase of a failcnt-value by mail if run e.g. as a cronjob with option '-t'. We use it with both cases to be sure that we see a peak in case it happened between the nagios-checks.

<source lang=python>
#!/usr/bin/python
# Copyright (C) 2008 Christian Benke
# Distributed under the terms of the GNU General Public License v2
# v0.2 2008-04-04
# Christian Benke <c.benke gmail com>

import string
import pickle
import sys
import getopt
import re

veid=''
current_data=dict()
opts=None
beancounter_data=None
picklefilepath='/tmp/beancounters_pickledump'

#-------- find the hostname for each veid ---:

def find_veid(veid):
veid_conf=open('/etc/vz/conf/' + str(veid) + '.conf','r')
if int(veid) != 0:
for line in veid_conf:
if "HOSTNAME" in line:
quotes=re.compile("\"")
line=quotes.sub("",line)
linefeed=re.compile("\n")
line=linefeed.sub("",line)
fqdn=re.split('=',line)
hostname=re.split('\.',fqdn[1])[0]
return hostname
else:
hostname='OpenVZ HN'
return hostname

# ---------- send mail in case of a counter-change

def send_mail(count_change):
sendmail = "/usr/lib/sendmail" # sendmail location
import os
p = os.popen("%s -t" % sendmail, "w")
p.write("From: root\n")
p.write("To: to@example.com\n")
p.write("Subject: Beancounters changed in the last 5 minutes\n")
p.write("\n") # blank line separating headers from body
p.write("The Beancounter-failcnt value of the following veid(s) and resource(s) has \n")
p.write("increased in the last 5 minutes:\n\n")
p.write(count_change)
sts = p.close()
if sts is not None:
print "Sendmail exit status", sts

#---------- compare the failcnt-values

def cntcheck(data_read,current_data,veid,fields,count,count_change):
if data_read and count == True and data_read is not '0': #comparing counters of new data with previous run
if data_read[veid][fields[0]][5] < current_data[veid][fields[0]][5]:
hostname=find_veid(veid)
count_change=str(count_change) + str(hostname) + ': ' + str(fields[0]) + ' failcnt has changed from ' + data_read[veid][fields[0]][5] + ' to ' + str(current_data[veid][fields[0]][5]) + '\n'
return count_change

#---------- compare the current value with barrier/limit value

def barriercheck(data_read,current_data,veid,fields,count,barrier_break):
if count == False: #comparing current level with barrier/limit
if current_data[veid][fields[0]][0] == 'oomguarpages': #for oomguarpages and physpages only the limit-value is relevant
if int(current_data[veid][fields[0]][1]) > int(current_data[veid][fields[0]][4])*0.9:
hostname=find_veid(veid)
barrier_break = str(barrier_break) + str(hostname) + ': ' + str(current_data[veid][fields[0]][0]) + ' '
elif current_data[veid][fields[0]][0] == 'physpages':
if int(current_data[veid][fields[0]][1]) > int(current_data[veid][fields[0]][4])*0.9:
hostname=find_veid(veid)
barrier_break = str(barrier_break) + str(hostname) + ': ' + str(current_data[veid][fields[0]][0]) + ' '
else:
if int(current_data[veid][fields[0]][1]) > int(current_data[veid][fields[0]][3])*0.9:
hostname=find_veid(veid)
barrier_break = str(barrier_break) + str(hostname) + ': ' + str(current_data[veid][fields[0]][0]) + ' '
return barrier_break

#------------ read user_beancounter and handle the result of the comparison subroutines

def compare_data(beancounter_data,data_read,count):
count_change=str()
barrier_break=str()
for line in beancounter_data:
if 'Version' in line or 'uid' in line or 'dummy' in line:
continue
else:
fields=line.split( )
if len(fields) == 7:
i=0
veid=int(fields[0][:-1])
fields.pop(0) #remove the first element
current_data[veid]=dict()
current_data[veid][fields[0]]=fields
else:
i=i+1
current_data[veid][fields[0]]=fields

# ------ check barrier/limit
barrier_break=barriercheck(data_read,current_data,veid,fields,count,barrier_break)

# ------ check failcnt
count_change=cntcheck(data_read,current_data,veid,fields,count,count_change)

if barrier_break and count == False:
print barrier_break
sys.exit(2)
elif count == False:
print 'All Beancounters OK'
sys.exit(0)

if count_change and count == True:
send_mail(count_change)
return current_data
elif count == True:
return current_data

# ----- pickle data - read or write

def pickle_data(current_data,action,count,picklefilepath):
try:
picklefile = None
if action == 'write':
if current_data:
picklefile=open(picklefilepath,'w')
pickle.dump(current_data, picklefile)
picklefile.close()
return
else:
print 'current_data is empty: ' + str(current_data)
elif action == 'read':
picklefile=open(picklefilepath,'r')
data_read=pickle.load(picklefile)
picklefile.close()
if data_read:
return data_read
else:
print 'DATA_READ IS NONE:' + str(data_read)
return data_read
except IOError:
current_data = compare_data(beancounter_data,'0',count)
picklefile=open(picklefilepath,'w')
pickle.dump(current_data,picklefile)
picklefile.close()

# ------- print script usage

def usage(prog="check_beancounter.py"):
print """
check_beancounter.py : Check if failcounters increase or resource-values break barriers or limits

check_beancounter.py [-tfh]

-h print this message

-t Check if failcnt-values have increased since the last run
-f Check if current value of a resource is higher than barrier/limit
"""

opts=getopt.getopt(sys.argv[1:], 'thf')
if opts:
if opts[0]==[]:
usage(); sys.exit(0)
elif opts[0][0][0]=='-h':
usage(); sys.exit(0)
elif opts[0][0][0]=='-t':
count=True
elif opts[0][0][0]=='-f':
count=False

beancounter_data=open('/proc/user_beancounters','r')
data_read=pickle_data(current_data,'read',count,picklefilepath)
current_data = compare_data(beancounter_data,data_read,count)
pickle_data(current_data,'write',count,picklefilepath)
</source>

Here is an alternative script, also written in python:
[http://www.kbrandt.com/2008/10/openvz-beancounters-nagios-script.html OpenVZ Nagios Bean Counters Script]

[[Category: HOWTO]]

[[Category: Monitoring]]

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Monitoring /proc/user beancounters with nagios