http://www.3open.org/d/ 2010-09-06T19:50:56+08:00 http://www.3open.org/d/ http://www.3open.org/d/lib/images/favicon.ico text/html 2010-02-15T15:57:38+08:00 http://www.3open.org/d/nagios/alert_using_sms?rev=1266220658&do=diff Requirements * either an account with SMS service provider Meteros Information Systems, or a GSM modem * Gnokii if GSM modem is used * SMS Dispatcher server and client scripts below Installing the SMS Dispatcher Server Server Features: * fault tolerance by using a locally connected GSM modem as backup. * local buffering using a MySQL database. * scheduling text/html 2010-05-11T18:11:37+08:00 http://www.3open.org/d/nagios/building_from_source_on_centos_5?rev=1273572697&do=diff Nagios Core Source used: nagios-3.2.0 Prepare user and group: useradd -r -d /var/log/nagios -s /bin/sh -c "nagios" nagios /usr/sbin/groupadd nagcmd /usr/sbin/usermod -G nagcmd nagios /usr/sbin/usermod -G nagcmd apache Compile and install: cd /unpacked-src-folder ./configure \ --prefix=/usr \ --exec-prefix=/usr/sbin \ --bindir=/usr/sbin \ --sbindir=/usr/lib/nagios/cgi \ --libexecdir=/usr/lib/nagios/plugins \ --datadir=/usr/share/nagios \ --sysconfdir=/etc/nagios \ --localstated… text/html 2010-02-08T14:24:35+08:00 http://www.3open.org/d/nagios/configuration_templates?rev=1265610275&do=diff Templates should be used to ease repetitive work. Enable PNP4Nagios for all host In the generic host definition template, define notes_url to point to the pnp page: define host{ name generic-host ; The name of this host template ... notes_url http://<server_name>/nagios/pnp/index.php?host=$HOSTNAME$ ... } text/html 2010-02-11T20:03:45+08:00 http://www.3open.org/d/nagios/init_script?rev=1265889825&do=diff #! /bin/bash # # smsd Start/Stop the SMS Dispatcher Server # # chkconfig: 2345 98 02 # description: Dispatch SMS message for Nagios # processname: smsd.pl # pidfile: /var/run/smsd.pid # Source function library. . /etc/init.d/functions RETVAL=0 # See how we were called. prog="smsd.pl" progdir="/usr/sbin" # Source configuration if [ -f /etc/sysconfig/$prog ] ; then . /etc/sysconfig/$prog fi start() { echo -n $"Starting $prog: " daemon $progdir/$prog -d RETVAL=$? echo [ $RETVAL -eq 0 … text/html 2010-02-24T12:13:34+08:00 http://www.3open.org/d/nagios/installing_pnp4nagios?rev=1266984814&do=diff Offical site: <http://www.pnp4nagios.org/> PNP4Nagios draws graphs of performance data collected by Nagios. [PNP4Nagios sample graph ] Compile from source Source used: pnp-0.4.14 Compile and install: ./configure \ --prefix=/usr/lib/nagios \ --mandir=/usr/share/man \ --with-perfdata-dir=/var/log/nagios/perfdata \ --with-perfdata-spool-dir=/var/log/nagios/perfdata/spool \ # <- this option for ncpd mode only --sysconfdir=/etc/nagios/pnp \ --datarootdir=/usr/share/nagios/pnp make ma… text/html 2010-02-22T16:23:29+08:00 http://www.3open.org/d/nagios/installing_the_nagvis_addon?rev=1266827009&do=diff Nagvis provides powerful visual representation of status of monitored devices. Offical site: <http://www.nagvis.org/> Install Source used: nagvis-1.4.6 Run the install.sh script to install it: [builder@vbox nagvis-1.4.6]# ./install.sh -B /usr/sbin/nagios -m /usr/local/bin/ndo2db +------------------------------------------------------------------------------+ | Welcome to NagVis Installer 0.2.11 | +-------------------------------------------------… text/html 2010-05-13T17:12:27+08:00 http://www.3open.org/d/nagios/installing_the_ndo2fs_addon?rev=1273741947&do=diff Use ndo2fs to replace ndo2db such that you don't need MySQL server and result in lighter system load. Official site: <http://www.pnp4nagios.org/ndo2fs/start> These notes apply to version 0.2.1. Compile cd /src-folder ./configure --prefix=/usr make install make install-init text/html 2010-05-13T17:00:25+08:00 http://www.3open.org/d/nagios/installing_the_ndoutils_addon?rev=1273741225&do=diff The NDOutils addon stores Nagios related data to MySQL database. Prepare the database Create Database: create database nagios default character set='utf8' default collate='utf8_general_ci'; grant SELECT, INSERT, UPDATE, DELETE on nagios.* to 'nagios'@'localhost' identified by 'secret'; text/html 2010-05-04T21:15:04+08:00 http://www.3open.org/d/nagios/monitoring_stock_price?rev=1272978904&do=diff I wrote a which will read quote for a specific stock from HKEX and monitor the bid price fluctuation. If the bid price goes beyond the upper or lower threshold, alert can be send. Syntax check_stock_quote.pl -s <stock_code> -w <low,high> -c <low,high> text/html 2010-05-03T16:23:32+08:00 http://www.3open.org/d/nagios/monitoring_volatile_service?rev=1272875012&do=diff When a service is defined as volatile, each time nagios found that the service is in hard non-OK state, nagios will: * log the event * send notification * execute event handler In other words, there is no need for hard state-change for these actions to fire. text/html 2010-02-23T15:45:11+08:00 http://www.3open.org/d/nagios/monitoring_windows_network_interface?rev=1266911111&do=diff Use the snmpwalk command to find out the interface OID of Windows: snmpwalk -c public -v 2c ntserver.example.com IF-MIB::ifDescr Output: Then use check_snmp_int, use some words of interface name(eg. “Intel”) instead of eth0: check_snmp_int.pl -v -H ntserver.example.com -C public -n "Intel" -k -w 1000,1000 -c 2000,2000 -B -d 7200 text/html 2010-02-23T16:00:25+08:00 http://www.3open.org/d/nagios/monitoring_with_snmp_traps?rev=1266912025&do=diff Required package SNMPTT 1. Install the snmptt program on the nagios master server. 2. Enable snmptrapd. The snmptrapd.conf contains this line: traphandle default /usr/sbin/snmptt It makes all trap go to snmptt for processing. 3. config snmptt by editing the /etc/snmp/snmptt.ini file. text/html 2010-05-03T16:05:13+08:00 http://www.3open.org/d/nagios/nagios?rev=1272873913&do=diff Nagios is a very robust and versatile network monitoring solution. We can use it to monitor a lot of things, from CPU temperature to stock price, as long as you can write the check script. Installation * Building from source on CentOS 5 * Installing the NDOutils addon * Installing the ndo2fs addon * Installing PNP4Nagios * Installing the NagVis addon text/html 2010-02-05T16:28:28+08:00 http://www.3open.org/d/nagios/ndo2db_init_script?rev=1265358508&do=diff #!/bin/bash # # ndo2db Start/Stop the ndo2db daemon for nagios SQL backend # # chkconfig: 2345 98 02 # description: connect ndo to the sql backend # processname: ndo2db # pidfile: /var/run/ndo2db.pid # Source function library. . /etc/init.d/functions RETVAL=0 # See how we were called. prog="ndo2db" progdir="/usr/local/bin/" # Source configuration if [ -f /etc/sysconfig/$prog ] ; then . /etc/sysconfig/$prog fi start() { echo -n $"Starting $prog: " daemon $progdir/$prog -c /etc/nagios/n… text/html 2010-02-08T17:05:29+08:00 http://www.3open.org/d/nagios/passive_monitoring?rev=1265619929&do=diff I have a host that for specific reason I cannot install the NPRE daemon on it. In order to monitor its internals I have to make it report its status to the Nagios Master. Install the batchcheck.sh script First, install the following batchcheck.sh script in the target host. text/html 2010-02-25T12:00:53+08:00 http://www.3open.org/d/nagios/set_downtime_automatically?rev=1267070453&do=diff For example, if CPU Load will be very high during daily backup at 22:00 ~ 00:00, we can schedule a daily downtime for the CPU Load check. Add this entry in a file under /etc/cron.d/ # daily backup at 22:00, and takes less than 2 hours, so don't notify during this period: 00 22 * * * nagios /usr/lib/nagios/plugins/set_downtime.pl -H myhost -C svc -s "CPU Load" -b 0 -e 7200 -m fix -u nagios-admin -c "doing daily backup" text/html 2010-02-11T20:10:16+08:00 http://www.3open.org/d/nagios/sms_dispatcher_server_script?rev=1265890216&do=diff #!/usr/bin/perl -w ################################################ # # SMS Dispatcher Server v0.1 # # Written by: Michael Fung http://www.3open.org/ # Last Update: 2010-02-11 # ################################################ # load required modules use strict; use POSIX; use DBI; use Getopt::Long; use LWP::UserAgent; # customizable settings my $dbhost = "localhost"; my $dbname = "smsd"; my $dbuser = "nagios"; my $dbpw = "secretpw"; my $dsn = "DBI:mysql:database=$dbname;host=$dbhost;mysql_… text/html 2010-02-11T20:50:56+08:00 http://www.3open.org/d/nagios/ssms.pl?rev=1265892656&do=diff #!/usr/bin/perl -w ################################################ # # SMS Dispatcher Client for use with Nagios # # Written by: Michael Fung http://www.3open.org # Last Updated: 2010-02-11 # ################################################ # Usage Example: # ssms.pl -t PROBLEM -a SVC -n 91234567 -g mygroup -H myhost -s HTTP -d 2 -o "Socket Timeout" -e 7200 # ssms.pl -t RECOVERY -a HOST -n 91234567 -g mygroup -H myhost -d 2 -e 7200 # load modules use strict; use Getopt::Long; use DBI; use P… text/html 2010-02-15T15:49:19+08:00 http://www.3open.org/d/nagios/using_pnp4nagios?rev=1266220159&do=diff Suppose we want to monitor the CPU load of the example-host. Enable performance processing in service definition: define service{ ... host_name example-host service_description CPU Load process_perf_data 1 check_command check_nrpe!check_load ... }