Installazione panchetti NRP e plugins:

Debian:

apt-get install nagios-nrpe-server nagios-plugins-basic

Centos:

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

yum install nrpe nagios-plugins-users nagios-plugins-load nagios-plugins-swap nagios-plugins-disk nagios-plugins-procs

Upload su Debian /usr/lib/nagios/plugins/ o Centos /usr/lib64/nagios/plugins/ altri scripts da \\groot.bo.priv\sistemisti\nrpe\scripts quasi sempre check_ram.sh

Rendere lo script eseguibile:

Debian: chmod 755 /usr/lib/nagios/plugins/check_ram.sh

Centos: chmod 755 /usr/lib64/nagios/plugins/check_ram.sh

Da Debian creare un nuovo file vim /etc/nagios/nrpe.d/nagios_commands.cfg con il contenuto:

################################################################################
#
# nagios-nrpe command configuration file
#
# COMMAND DEFINITIONS
# Syntax:
#       command[<command_name>]=<command_line>
#
command[USERS]=/usr/lib/nagios/plugins/check_users -w 5 -c 10
command[CPU]=/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[SDA1]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/sda1 -m
command[ZOMBIE]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[TOTAL_PROC]=/usr/lib/nagios/plugins/check_procs -w 150 -c 200
command[SWAP]=/usr/lib/nagios/plugins/check_swap -w 20% -c 10%
command[ROOT]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p / -m
command[OPT]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /opt -m
command[RAM]=/usr/lib/nagios/plugins/check_ram.sh 20 10

Da Centos vim /etc/nrpe.d/nagios_commands.cfg con il contenuto:

################################################################################
#
# nagios-nrpe command configuration file
#
# COMMAND DEFINITIONS
# Syntax:
#       command[<command_name>]=<command_line>
#
command[USERS]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10
command[CPU]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[SDA1]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/sda1 -m
command[ZOMBIE]=/usr/lib64/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[TOTAL_PROC]=/usr/lib64/nagios/plugins/check_procs -w 150 -c 200
command[SWAP]=/usr/lib64/nagios/plugins/check_swap -w 20% -c 10%
command[ROOT]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p / -m
command[OPT]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /opt -m
command[RAM]=/usr/lib64/nagios/plugins/check_ram.sh 20 10

Edita vim /etc/nagios/nrpe.cfg aggiungendo il server nagios:

allowed_hosts=127.0.0.1,10.17.61.254

Restart nrpe agent nel host:

Debian: service nagios-nrpe-server restart

Centos:Service nrpe restart

Per WINDOWS editare il file nsclient.ini che si trova in NSClient++ di Program Files.

# If you want to fill this file with all available options run the following command:
# nscp settings — generate — add-defaults — load-all
# If you want to activate a module and bring in all its options use:
# nscp settings — activate-module <MODULE NAME> — add-defaults
# For details run: nscp settings — help
; TODO
[/settings/default]
; Undocumented key
password = nagios
; Undocumented key
allowed hosts = 127.0.0.1,10.17.61.254
port = 5666
; TODO
[/settings/NRPE/server]
allow arguments = true
allow nasty characters = true
; Undocumented key
verify mode = none
; Undocumented key
insecure = true 
; TODO
[/modules]
#These are basic modules comes with NSClient++ and below configuration enable them.
; Undocumented key
CheckExternalScripts = 1
; Undocumented key
CheckHelpers = 1
; Undocumented key
CheckEventLog = 1
; Undocumented key
CheckNSCP = 1
; Undocumented key
CheckDisk = 1
; Undocumented key
CheckSystem = 1
; Undocumented key
NSClientServer = 1
; Undocumented key
NRPEServer = 1
[/settings/external scripts/alias]
windows_RAM=checkMem MaxWarn=80% MaxCrit=90% type=physical
windows_CPU=checkCPU warn=80 crit=90 time=5m time=1m time=30s
windows_UPTIME=checkUpTime MinWarn=1d MinWarn=1h
windows_DISK_E=CheckDriveSize MinWarn=20% MinCrit=10% Drive=E: FilterType=FIXED ShowAll=short 
windows_DISK_C=CheckDriveSize MinWarn=20% MinCrit=10% Drive=C: FilterType=FIXED ShowAll=short
[/settings/external scripts]
allow arguments = true
allow nasty characters = true
[/settings/external scripts/scripts]
#check_Service = scripts\check_winservice.exe check_winservice — #service $ARG1$ — state stopped — critical 0
 
check_AbridgeDiagnosticsService = scripts\check_winservice.exe check_winservice — service “AbridgeDiagnostics” — state stopped — critical 0
check_RabbitMQ = scripts\check_winservice.exe check_winservice — service “RabbitMQ” — state stopped — critical 0
check_W3SVC = scripts\check_winservice.exe check_winservice — service “W3SVC” — state stopped — critical 0

Riavviare il servizio nsclient.

Lo script da copiare in /usr/lib/nagios/plugins/

check_tomcat.pl

#! /usr/bin/env python
# -*- coding: utf-8 -*-
 
# I'm a Spanish speaker, my English is basic but I try to write everything in
# English.
# Many translations have been made with automatic translators.
# If something is not meant pray excuse me.
# ¡VAMOS A ELLO! (LET'S GO!)
 
#-------------------------------------------------------------------------------
# Name:        check_tomcat.pl
#
# Author:      Daniel Dueñas
#
# Purpose:
# Plugin para chequeo de servidor tomcat para nagios
# Check tomcat server plugin for nagios
# This plugin uses the tomcat manager webapp, this app usually is located in the
# URL:
# http://tomcat-host-name:xxxx/manager
# which "tomcat-host-name" is the dns name or ip of the tomcat server and "xxxx"
# is the port number of the tomcat service (the tomcat port is 8080 by default)
#
# This plugin can check this items:
# 1- tomcat server status
# 2- tomcat server memory
# 3- tomcat server thread connectors
# 4- application status on tomcat server
#
#
# This plugin conforms to the Nagios Plugin Development Guidelines
# https://nagios-plugins.org/doc/guidelines.html
#
# Created:     18/02/2014
# Copyright:   (c) Daniel Dueñas 2014
# Licence:
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#-------------------------------------------------------------------------------
 
import argparse, sys
import urllib2
import socket
import xml.etree.ElementTree as ET
from math import log
 
#++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#VARIABLE DEFINITIONS
#--------------------------------------------------------------------------
version="2.1"   #Plugin version
status = { 'OK' : 0 , 'WARNING' : 1, 'CRITICAL' : 2 , 'UNKNOWN' : 3}
exit_status = 'OK'
output = ""
longoutput = ""
perfdata = ""
mensage = ""
plugin_description ='''Nagios plugin for check an apache tomcat server
'''
mode_help ='''Tomcat monitorizacion mode:
    status: The status of tomcat server
    mem:    Tomcat server used percentage memory status, warning and critical
            values. Requiered in percentage.
    thread: Tomcat connectors Threads used, warning and critical values requiered.
            The parameter connector is optional, if not exists, all connector were shown.
    app:    Application status in tomcat server, the name of the application
            must be defined with the parameter -n or --nameapp.
            This option check the status of java application running on tomcat server
'''
tree_xml=None
tomcat_version=None
 
#++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#FUNCTIONS
#-------------------------------------------------------------------------
#Try if string is a float
def is_float_try(str):
    try:
        float(str)
        return True
    except ValueError:
        return False
 
#This function define the range of warning and critical values
#Return a range --> (min,max,True/False)
#if True, data must be in a range
#if False, data must be out of a range
def define_range(str):
    if is_float_try(str):
        range = (0,float(str),True)  # x -> in range(0,x)
    elif str.count(":")==1:
        splits = str.split(":")
        if is_float_try(splits[0]) and is_float_try(splits[1]):
            range=(float(splits[0]),float(splits[1]),True) # x:y  -> in range(x,y)
        elif is_float_try(splits[0]) and splits[1]=="":
            range=(float(splits[0]),float("inf"),True)  # x:  -> in range(x,infinite)
        elif splits[0]=="~" and is_float_try(splits[1]):
            range=(float("-inf"),float(splits[1]),True) # ~:x -> in range(-infinite,x)
        if splits[0][0]=="@" and is_float_try(splits[0].replace("@","")) and is_float_try(splits[1]):
            range=(float(splits[0].replace("@","")),float(splits[1]),False) # @x:y -> out of range(x,y)
    else:
        print "bad range definition in "+str
        sys.exit(1) #Error in range definition
    if range[0]<range[1]:
        return range   # OK
    else:
        print "Second value of range "+str+" is less than first value"
        exit(1)
 
#Critical and warning function resolve
#This function return exit_status: OK,WARNING,CRITICAL or UNKNOWN string
def define_status(value,warning,critical):
    warning_range = define_range(warning)   #Define warning range
    critical_range = define_range(critical) #Define critical range
    val=float(value)                        #The value
    exit_status="UNKNOWN"                   #status by default
 
    if args.verbosity:
        print "Value for test: "+str(value)
        print "Warning range (min:%s max:%s in_range:%s)"%(str(warning_range[0]),str(warning_range[1]),str(warning_range[2]))
        print "Critical range (min:%s max:%s in_range:%s)"%(str(critical_range[0]),str(critical_range[1]),str(critical_range[2]))
        print ""
 
    #value into the range range(x:y:True)
    if warning_range[2]==True and critical_range[2]==True:
        if (warning_range[1]>critical_range[1]) or (warning_range[0]<critical_range[0]):
            parser.print_usage()
            parser.exit(3,"ERRROR: critical range (%s) is greater than warning range(%s)\n" % (critical, warning))
        if value<warning_range[0] or value>warning_range[1]:
            exit_status="WARNING"
            if value<critical_range[0] or value>critical_range[1]:
                exit_status="CRITICAL"
        else:
            exit_status="OK"
 
    #value out of range range(x:y:False)
    elif warning_range[2]==False and critical_range[2]==False:
        if (warning_range[1]<critical_range[1]) or (warning_range[0]>critical_range[0]):
            parser.print_usage()
            parser.exit(3,"ERRROR: critical range (%s) is greater than warning range(%s)\n" % (critical, warning))
        if value>warning_range[0] and value<warning_range[1]:
            exit_status="WARNING"
            if value>critical_range[0] and value<critical_range[1]:
                exit_status="CRITICAL"
        else:
            exit_status="OK"
    #warning and critical ranges must be both in or out
    else:
        parser.print_usage()
        parser.exit(status[exit_status],'''
ERROR: Both critical and warning values must be in or out of the ranges:
       warning('''+warning+''') and critical ('''+critical+''')\n''')
 
    return exit_status
 
# convert human readable size function
def sizeof_fmt(num):
    # Human friendly size
    unit_list = zip(['bytes', 'kB', 'MB', 'GB', 'TB', 'PB'], [0, 0, 1, 2, 2, 2])
    if num > 1:
        exponent = min(int(log(num, 1024)), len(unit_list) - 1)
        quotient = float(num) / 1024**exponent
        unit, num_decimals = unit_list[exponent]
        format_string = '{0:.%sf} {1}' % (num_decimals)
        return format_string.format(quotient, unit)
    elif num == 0:
        return '0 bytes'
    elif num == 1:
        return '1 byte'
    elif num < 0:
        return 'negative number'
    else:
        return None
 
#open and read XML from tomcat manager/status?XML=true
def read_page_status_XML(host,port,url,user,password):
 
    url_status_xml = url+"/status?XML=true"
    page,error_page = read_page(host,port,url_status_xml,user,password)
    # End of Open manager status
    if(error_page):
        return page,error_page
    else:
    # Read xml
        try:
            root = ET.fromstring(page)
        #If can't parse XML
        except ET.ParseError as e:
            root="ERROR: I Can't understand the XML page. Error: %s" %(e)
            error_page=True
        #show XML tree
        if args.verbosity>1:
            print "XML tree:"
            print ET.dump(root)
            print ""
        return root,error_page
 
#Read a html manager page
def read_page(host,port,url,user,password):
    error=False
    url_tomcat = "http://"+host+":"+port+url
    if args.verbosity:
        print "connection url: %s\n"%(url_tomcat)
 
    try:
        password_mgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
        password_mgr.add_password(None,url_tomcat,user,password)
        handler = urllib2.HTTPBasicAuthHandler(password_mgr)
        opener=urllib2.build_opener(handler)
        urllib2.install_opener(opener)
        req = urllib2.Request(url_tomcat)
        handle = urllib2.urlopen(req, None)
        # Store all page in a variable
        page = handle.read()
        # End of Open manager status
    except urllib2.HTTPError as e:
        if(e.code==401):
            page="ERROR: Unauthorized, your user not have permissions. %s" %(e)
        elif(e.code==403):
            page="ERROR: Forbidden, yours credentials are not correct. %s" %(e)
        else:
            page="ERROR: The server couldn\'t fulfill the request. %s" %(e)
        error=True
    except urllib2.URLError as e:
       page = 'ERROR: We failed to reach a server. Reason: %s' %(e.reason)
       error = True
    except socket.timeout as e:
        page = 'ERROR: Timeout error'
        error = True
    except socket.error as e:
       page = "ERROR: Dammit! I can't connect with host "+args.host+":"+args.port
       error = True
    except:
       page = "ERROR: Unexpected error (I'm damned if I know!): %s"%(sys.exc_info()[0])
       error = True
 
    # Show page if -vvv option
    if args.verbosity>2:
        print "page "+url_tomcat+" content:"
        print page
        print ""
    return page,error
 
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# ARGPARSE OBJECT DEFINITION
#---------------------------------------------------------------------------
parser = argparse.ArgumentParser(description=plugin_description,
                                formatter_class=argparse.RawTextHelpFormatter)
parser.version = parser.prog+" 1.0"
parser.add_argument('-V','--version', action='version',
                    help="Show plugin version",
                    version='%(prog)s '+version)
parser.add_argument('-v', '--verbosity',action="count",
                    help='''increase output verbosity:
                    -v Single line, additional information (eg list processes that fail)\n
                    -vv Multi line, configuration debug output (eg ps command used)
                    -vvv Lots of detail for plugin problem diagnosis
                    ''')
 
# Connection parameters
conn_parameters = parser.add_argument_group('Connection parameters',
                  'parameters for Tomcat connection')
conn_parameters.add_argument('-H', '--host',
                    help="Name or Ip of tomcat host",
                    required=True)
conn_parameters.add_argument('-p','--port',
                    help="Tomcat port (Example:8080)",
                    required=True)
conn_parameters.add_argument('-u','--user',
                    default = "admin",
                    help="Tomcat user")
conn_parameters.add_argument('-a','--authentication',
                    metavar='PASS',
                    default = "tomcat",
                    help="Tomcat authentication password")
conn_parameters.add_argument('-U','--URL',
                    default = "/manager",
                    help='''Tomcat manager app url "/manager" by default''')
conn_parameters.add_argument('-C','--connector',
                    help='''Connector name, used in thread mode''')
conn_parameters.add_argument('-t', '--timeout',
                    default = "5",
                    help='''Timeout for connection (5 seconds by default)''')
conn_parameters.add_argument('-e','--expire_time',
                    default = "0",
                    help='''Expire time for sessions created in tomcat manager app
                    value in minutes (0 minutes by default)''')
 
parameters = parser.add_argument_group('Check parameters',
             'Parameters for tomcat check')
parameters.add_argument('-n','--nameapp',
                    help="Name of the java application you want to check, only for app mode")
parameters.add_argument('-w','--warning',
                    help="Warning value")
parameters.add_argument('-c','--critical',
                    help="Critical value")
parameters.add_argument('-m','--mode',
                    choices=['status','mem','thread','app'],
                    help=mode_help,
                    required=True)
 
 
#Corrects negative numbers in arguments parser
for i, arg in enumerate(sys.argv):
    if arg!="": #prevent an empty character, as ""
        if (arg[0] == '-') and arg[1].isdigit(): sys.argv[i] = ' ' + arg
# arguments parse
args = parser.parse_args()
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 
 
#No arguments
if sys.argv[1:] == []:
    parser.print_usage()
    parser.exit(status['UNKNOWN'],
                "ERROR: No arguments, write '"+parser.prog+" -h' for help\n")
 
if args.verbosity!=None:
    if args.verbosity>3:
        args.verbosity=3
    print "verbosity level = %i\n"%(args.verbosity)
 
if args.verbosity:
    print "Arguments: %s" %(str(args))
#plugin logic...
 
 
 
#+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#MODE OPTIONS LOGIC
#-------------------------------------------------------------------------
 
#Set timeout global
socket.setdefaulttimeout(float(args.timeout))
 
#read serviceinfo
url_serverinfo = args.URL+"/serverinfo"
page_serverinfo,error_serverinfo = read_page(args.host,args.port,url_serverinfo,args.user,args.authentication)
if args.verbosity>2:
    print "serverinfo:"
    print page_serverinfo
 
# if error, try the manager/text/serverinfo, because in tomcat 7 change the path
# of the manager app commands
if(error_serverinfo):
    url_serverinfo = args.URL+"/text/serverinfo"
    page_serverinfo,error_serverinfo = read_page(args.host,args.port,url_serverinfo,args.user,args.authentication)
# Now it is an error yes or yes
if(error_serverinfo):
    output = page_serverinfo
    exit_status='UNKNOWN'
if(error_serverinfo==False):
    # read tomcat version in serverinfo
    serverinfo = page_serverinfo.splitlines()
    if args.verbosity>1:
        print "Server info split: "
        print serverinfo
        print ""
    tomcat_version_string = (serverinfo[1].split(":"))[1]
    tomcat_status_string = serverinfo[0]
    if args.verbosity>2:
        print "tomcat_version_string: "+tomcat_version_string
        print "tomcat_status_string: "+tomcat_status_string
    #tomcat version is read in line 2 of serverinfo
    #example:" Apache Tomcat/7.0.53", choose the "7"
    tomcat_version = (tomcat_version_string.split("/"))[1].split(".")[0]
    if args.verbosity:
        print "tomcat_version: "+tomcat_version
    #If i can't read the tomcat version because it is not a number
    if (tomcat_version.isdigit()==False):
        tomcat_version=0
        if args.verbosity:
            print "WARNING: I can't read the tomcat version"
 
# status option
#-----------------------------------------------------------------------------
if args.mode == 'status':
    #Default state is CRITICAL
    exit_status='CRITICAL'
    # If serverinfo page is correct
    if (error_serverinfo!=True):
        # check if the first line of serverinfo content "OK"
        if (tomcat_status_string.find("OK")!=-1):
            output = tomcat_version_string+" server is OK"
            exit_status='OK'
        else:
            output="This server is not a tomcat server or "+url_serverinfo+" is not the manager app server info page"
            exit_status='UNKNOWN'
    # if serverinfo page is not correct try with th status xml page
    else:
        tree_xml,error_status_xml = read_page_status_XML(args.host,args.port,args.URL,args.user,args.authentication)
        #check if page status xml is OK
        if (error_status_xml!=True):
            if (tree_xml!=None):
                if tree_xml.tag=='status':    #The first tag of xml is "status"
                    output="The Tomcat server is OK, but page serverinfo not work"
                    exit_status='OK'
                else:
                    output="This server is not a tomcat server or not status xml page"
                    exit_status='UNKNOWN'
            else:
                output="I can't read either serviceinfo or serverstatus, this server not seems a Tomcat Server"
                exit_status='CRITICAL'
        else:
            output=tree_xml
            exit_status='CRITICAL'
 
 
# mem option
#-----------------------------------------------------------------------------
if args.mode == 'mem':
    # read status xml for extract mem data
    tree_xml,error_status_xml = read_page_status_XML(args.host,args.port,args.URL,args.user,args.authentication)
    if error_status_xml:
        output = tree_xml
        exit_status = 'WARNING'
    else:
        if tree_xml!=None:
            #control warning and critical values
            if (args.warning==None) or (args.critical==None):
                parser.print_usage()
                parser.exit(status['UNKNOWN'],
                            'ERROR: Warning and critical values requiered with mode "mem"\n')
            memory = tree_xml.find('.//memory')
            free_memory = float(memory.get('free'))
            total_memory = float(memory.get('total'))
            max_memory = float(memory.get('max'))
            available_memory = free_memory + max_memory - total_memory
            used_memory = max_memory - available_memory
            percent_used_memory = float((used_memory * 100)/max_memory)
            if args.verbosity:
                print "mode: mem(memory)"
                if args.verbosity > 1:
                    print "free:%0.1f total:%0.1f max:%0.1f available:%0.1f used:%0.1f percent_used:%0.2f"%(free_memory,
                                            total_memory,max_memory,available_memory,used_memory,percent_used_memory)
                print "free_memory:%s total memory:%s max_memory:%s"%(sizeof_fmt(free_memory),sizeof_fmt(total_memory),sizeof_fmt(max_memory))
                print "available_memory = free_memory + max_memory - total_memory -->  %s" %(sizeof_fmt(available_memory))
                print "used_memory = max_memory - available_memory -->  %s" %(sizeof_fmt(used_memory))
                print "percent_used_memory = (used_memory * 100)/max_memory  -->  %0.2f%%\n"%(percent_used_memory)
 
            #Define status whit function
            exit_status=define_status(percent_used_memory,args.warning,args.critical)
            output="Used memory "+sizeof_fmt(used_memory)+" of "+sizeof_fmt(max_memory)+"(%0.2f%%)" %(percent_used_memory)
            perfdata="'Used_memory'=%0.0f%%;%s;%s"%(percent_used_memory,args.warning,
                                                        args.critical)
 
# threads option
#-----------------------------------------------------------------------------
if args.mode == 'thread':
    # read status xml for extract mem data
    tree_xml,error_status_xml = read_page_status_XML(args.host,args.port,args.URL,args.user,args.authentication)
    if error_status_xml:
        output = tree_xml
        exit_status = 'WARNING'
    else:
        if tree_xml!=None:
            #control warning and critical values
            if (args.warning==None) or (args.critical==None):
                parser.print_usage()
                parser.exit(status['UNKNOWN'],
                            'ERROR: Warning and critical values of number of threads open is requiered with mode "thread"\n')
            if(args.connector==None):
                if (args.verbosity>0): print "Finding all connectors"
                for connector in tree_xml.findall('./connector'):
                    connector_name = str(connector.get('name'))
                    if (args.verbosity>0): print "Find %s connector"%(connector_name)
                    thread = connector.find('./threadInfo')
                    max_thread = float(thread.get('maxThreads'))
                    busy_thread = float(thread.get('currentThreadsBusy'))
                    iter_status=define_status(busy_thread,args.warning,args.critical)
                    if status[iter_status] > status[exit_status]:
                            exit_status=iter_status
                    output = output + '/connector:%s %0.0f threads busy of %0.0f '%(connector_name,busy_thread,max_thread)
                    perfdata = perfdata + "'conn %s'=%0.0f;%s;%s;0;%0.0f "%(connector_name,busy_thread,args.warning,args.critical,max_thread)
 
            else:
                if (args.verbosity>0): print "Finding %s connector"%(args.connector)
                for connector in tree_xml.findall('./connector'):
                    connector_name = str(connector.get('name'))
                    if (args.connector==connector_name):
                        if (args.verbosity>0):
                            print "Find %s connector"%(connector_name)
                        thread = connector.find('./threadInfo')
                        max_thread = float(thread.get('maxThreads'))
                        busy_thread = float(thread.get('currentThreadsBusy'))
                        exit_status=define_status(busy_thread,args.warning,args.critical)
                        output = output + 'connector:%s %0.0f threads busy of %0.0f '%(connector_name,busy_thread,max_thread)
                        perfdata = perfdata + "'conn %s'=%0.0f;%s;%s;0;%0.0f "%(connector_name,busy_thread,args.warning,args.critical,max_thread)
 
# app option
#-----------------------------------------------------------------------------
if args.mode == 'app':
    #Watch if nameapp is defined
    if args.nameapp==None:
        parser.print_usage()
        parser.exit(status['UNKNOWN'],
                            'ERROR: nameapp value requiered with mode "app"\n')
    #If serverinfo is not read
    if error_serverinfo:
        output="I can't read the serverinfo page. "+page_serverinfo
        exit_status='UNKNOWN'
    #If serverinfo is read
    else:
        #for versions upper Tomcat 6
        if (int(tomcat_version) > 6):
            url_list = args.URL+"/text/list"
        else:
            url_list = args.URL+"/list"
 
        #read application list page
        page_list,error_list = read_page(args.host,args.port,url_list,args.user,args.authentication)
        #If list page is not read
        if error_list:
            output="I can't read the list page of tomcat manager "+page_list
            exit_status='UNKNOWN'
        #If list page is read
        else:
            #Divide page_list in lines, each line is an application in the tomcat server
            applist = page_list.splitlines()
            if args.verbosity>1:
                print "page_list split:"
                print applist
                print ""
            #Applications in page list are like "/the_name_of_the_app"
            matchapp = "/"+args.nameapp
            match = False     #Flag
            for application in applist:
                application = application.split(":")
                if matchapp == application[0]:
                    match=True
                    break
            #If match app
            if match:
                if application[1]=="running":
                    output = args.nameapp+" is running"
                    exit_status="OK"
                elif application[1]=="stopped":
                    output = args.nameapp+" is stopped"
                    exit_status="WARNING"
                else:
                    output = "I can't understand the state "+application[1]
                    exit_status="WARNING"
                #perfdata is the number of sessions for the application
                perfdata="'sessions'="+application[2]
            #If not match app
            else:
                output = "I can't find the "+matchapp+" application in the tomcat server"
                exit_status="CRITICAL"
 
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
#Expire sessions
 
#If serverinfo is read
if not error_serverinfo:
    if (int(tomcat_version) > 6):
        url_expire = args.URL+"/text/expire?path="+args.URL+"&idle="+args.expire_time
    else:
        url_expire = args.URL+"/expire?path="+args.URL+"&idle="+args.expire_time
    #for versions upper Tomcat 6
    #Expire sessions of manager app
    page_expire,error_expire = read_page(args.host,args.port,url_expire,args.user,args.authentication)
if (args.verbosity>0):
    if not error_expire:
        print("Expire sessions of "+args.URL)
    if (args.verbosity>1):
        print("Expire information:")
        print(page_expire)
 
 
 
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
#Outputs
 
if output=='':
    output = "ERROR: no output"
    exit_status ='UNKNOWN'
message = exit_status + " " + output
if perfdata!="":
    message = message + '|' + perfdata
if longoutput!="":
    message = message + longoutput
print message
sys.exit(status[exit_status])

Una volta creato lo script nella cartella indicata assegnare permessi di escuzione.

chmod +x /usr/lib/nagios/plugins/check_tomcap.py

Editare il file

/etc/nagios/nrpe.cfg

aggiungiere le seguenti righe:

command[check_tomcat_status]=/usr/lib/nagios/plugins/check_tomcat.py -H localhost -p 8080 -u admin -a 3dinformatica -m status
command[check_tomcat_mem]=/usr/lib/nagios/plugins/check_tomcat.py -H localhost -p 8080 -u admin -a 3dinformatica -m mem -w 80 -c 90
command[check_tomcat_thread]=/usr/lib/nagios/plugins/check_tomcat.py -H localhost -p 8080 -u admin -a 3dinformatica -m thread -w 150 -c 190
command[check_tomcat_app]=/usr/lib/nagios/plugins/check_tomcat.py -H localhost -p 8080 -u admin -a 3dinformatica -m app $ARG1$
command[check_tomcat_app_jenkins]=/usr/lib/nagios/plugins/check_tomcat.py -H localhost -p 8080 -u admin -a 3dinformatica -m app -n jenkins

template

template_monitoraggio_tomcat.cfg

define host{
	use		linux-server
        host_name       tomcat-test
        alias           tomcat-test
#	hostgroups      MSA-internal
        address         10.17.61.34
	parents		vmtest
}
 
define service{
        use                     generic-service
        host_name               tomcat-test
        service_description     PING    
        check_command           check_ping!100.0,20%!500.0,60%
}
 
define service {
        service_description             Tomcat Status
        host_name                       tomcat-test
        check_command                   check_nrpe_1arg!check_tomcat_status
        use                             generic-service
        notification_interval           0 ; set > 0 if you want to be renotified
}
 
define service {
        service_description             Tomcat Memory
        host_name                       tomcat-test
        check_command                   check_nrpe_1arg!check_tomcat_mem
        use                             generic-service
        notification_interval           0 ; set > 0 if you want to be renotified
}
 
define service {
        service_description             Jenkins
        host_name                       tomcat-test
        check_command                   check_nrpe_1arg!check_tomcat_app_jenkins
        use                             generic-service
        notification_interval           0 ; set > 0 if you want to be renotified
}
 
define service {
        service_description             Tomcat Thread
        host_name                       tomcat-test
        check_command                   check_nrpe_1arg!check_tomcat_thread
        use                             generic-service
        notification_interval           0 ; set > 0 if you want to be renotified
}
 
define service {
        host_name                       tomcat-test
        service_description             Tomcat Port
        check_command                   check_http!-p 8080
        use                             generic-service
        notification_interval           0 ; set > 0 if you want to be renotified
}

Nagios core richiede 4 formati dello stesso file (gd2, png, jpg, gif). Usare icone 40×40 con sfondo trasparente. Ci sono diverse utility ed è stato realizzato anche uno script che dato come argomento un gif realizza la conversione negli altri formati.

nagiosicon.sh

#!/bin/bash
# Create Nagios Icon from GIF
# Autor : Marvin Pascale
# Make a 40x40 px GIF image without backgroud 
# Usage: nagiosicon.sh image.gif
#install: libgd-tools pnmtopng
#Enjoy nerd
 
if [ $# -eq 0 ]
  then
    echo ""
    echo "Error:"
    echo "No arguments supplied"
    echo "Usage : ./nagiosicon.sh image.gif"
    echo ""
fi
 
path="/usr/bin"
for arg
do
  if [ -f "$arg" ]; then
    echo converting $arg
    arg="$(echo $arg | sed 's/\.gif$//')"
    echo "Creating folder" $arg
    mkdir $arg
    cp $arg.gif $arg/
    $path/giftopnm $arg.gif > $arg.pnm
    $path/pnmtopng -transparent rgb:ff/ff/ff $arg.pnm > $arg/$arg.png
    $path/pnmtojpeg -quality=100 -optimize -smooth=0 $arg.pnm > $arg/$arg.jpg
    $path/pngtogd2 $arg/$arg.png $arg/$arg.gd2 0 1 
  fi
done
 
rm -f *.pnm

Per visualizzare correttamente le gerarchie nella mappa di Nagios bisogna correttamente utilizzare la specifica “parents” in fase di dichiarazione dell'host. In questa maniera si indica al core di Nagios a chi è fisicamente o virtualmente collegato l'host in quesitone es:

define host{
  use             linux-server ; Template host, esistente generic-host
  host_name       tomcat-test  ; il nome che si assegna all'host, servirà per assegnare servizi
  alias           tomcat-test  ; il nome che sarà visualizzato come nome esteso
  address         10.17.61.34  ; Idirizzo ip o hostname 
  parents         vmtest       ; Collegamento fisico o virtuale. Anche più valori separati da una virgola
}