{"id":1648,"date":"2012-10-30T17:01:02","date_gmt":"2012-10-30T09:01:02","guid":{"rendered":"http:\/\/rmohan.com\/?p=1648"},"modified":"2012-10-30T19:19:41","modified_gmt":"2012-10-30T11:19:41","slug":"nagios","status":"publish","type":"post","link":"https:\/\/mohan.sg\/?p=1648","title":{"rendered":"NAGIOS"},"content":{"rendered":"

Nagios<\/strong><\/p>\n

Firewall and SElinux is Disable <\/strong><\/p>\n

Server IP :- 192.168.0.10<\/strong><\/div>\n
Hostname :- shashi.example.com<\/strong><\/div>\n
\u00a0<\/div>\n
Client IP :- 192.168.0.11<\/strong><\/div>\n
Hostname :- client.example.com<\/strong><\/div>\n
\u00a0<\/div>\n
1.Package Requirement :-<\/strong><\/div>\n
\u00a0<\/div>\n
# yum install httpd php<\/div>\n
# yum install gcc glibc glibc-common<\/div>\n
# yum install gd gd-devel<\/div>\n
\u00a0<\/div>\n
2.Create Nagios user and group :-<\/strong><\/div>\n
\u00a0<\/div>\n
# useradd -m nagios<\/div>\n
# passwd nagios<\/div>\n
# usermod -G nagios\u00a0 nagios
# groupadd nagcmd<\/div>\n
# usermod -a -G nagcmd nagios<\/div>\n
# usermod -a -G nagcmd apache<\/div>\n
\u00a0<\/div>\n
3.Download Some Package :-<\/strong><\/div>\n
\u00a0<\/div>\n
# mkdir \/opt\/nagios<\/div>\n
\u00a0<\/div>\n
# cd \/opt\/nagios<\/div>\n
\u00a0<\/div>\n
# wget http:\/\/prdownloads.sourceforge.net\/sourceforge\/nagios\/nagios-<\/a><\/span><\/div>\n
3.2.3.tar.gz<\/div>\n
\u00a0<\/div>\n
# wget http:\/\/prdownloads.sourceforge.net\/sourceforge\/nagiosplug\/nagios-<\/a><\/span><\/div>\n
plugins-1.4.11.tar.gz<\/div>\n
\u00a0<\/div>\n
# tar xvf nagios-3.2.3.tar.gz<\/div>\n
\u00a0<\/div>\n
# cd nagios-3.2.3<\/div>\n
\u00a0<\/div>\n
# .\/configure –with-command-group=nagcmd<\/div>\n
\u00a0<\/div>\n
# make all<\/div>\n
\u00a0<\/div>\n
# make install<\/div>\n
\u00a0<\/div>\n
# make install-init<\/div>\n
\u00a0<\/div>\n
# make install-config<\/div>\n
\u00a0<\/div>\n
# make install-commandmode<\/div>\n
\u00a0<\/div>\n
\n
# make install-webconf<\/div>\n
\u00a0<\/div>\n

\u00a04.vim \/usr\/local\/nagios\/etc\/objects\/contacts.cfg<\/strong><\/p>\n<\/div>\n

\u00a0<\/div>\n
35: change —> email youadmin-mail-ID<\/div>\n
\u00a0<\/div>\n

6.Give the password web nagiosadmin user<\/strong><\/p>\n

\u00a0<\/div>\n
htpasswd -c \/usr\/local\/nagios\/etc\/htpasswd.users nagiosadmin<\/div>\n
New password :<\/div>\n
Re-type new password :<\/div>\n
\u00a0<\/div>\n
Note:- If you want to change admin \u201cnagiosadmin\u201d name change all in \u201c\/usr\/local\/nagios\/etc\/cgi.cfg\u201d file too.<\/div>\n
\u00a0<\/div>\n
7. Go to this Path :-<\/strong><\/div>\n
\u00a0<\/div>\n
# cd \/opt\/shashi<\/div>\n
\u00a0<\/div>\n
# tar xvf nagios-plugin-1.4.11.tar.gz<\/div>\n
\u00a0<\/div>\n
# cd nagios-plugin-1.4.11<\/div>\n
\u00a0<\/div>\n
# .\/configure – – with-nagios-user=nagios – – with-nagios-group=nagios<\/div>\n
\u00a0<\/div>\n
# make<\/div>\n
\u00a0<\/div>\n
# make install<\/div>\n
\u00a0<\/div>\n
# chkconfig – – add nagios<\/div>\n
\u00a0<\/div>\n
# chkconfig nagios on<\/div>\n
\u00a0<\/div>\n
# \/etc\/init.d\/nagios start<\/div>\n
\u00a0<\/div>\n
# \/etc\/init.d\/nagios restart<\/div>\n
\u00a0<\/div>\n
# chkconfig nagios on<\/p>\n

# \/etc\/init.d\/httpd restart<\/p>\n

#chkconfig httpd on<\/p>\n<\/div>\n

\u00a0<\/div>\n
# \/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg (check nagios)<\/div>\n
\u00a0<\/div>\n
Total warnings: 0<\/div>\n
Total Errors: 0<\/div>\n
Things look okay \u2013 No serious problems<\/div>\n
\u00a0<\/div>\n
8.Login to web interface :-<\/strong><\/div>\n
\u00a0<\/div>\n
URL:- http:\/\/192.168.0.10\/nagios\/<\/a><\/span><\/div>\n
\u00a0<\/div>\n
username :- nagiosadmin<\/div>\n
passwd :- *******<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
9.Package Requirement :-<\/strong><\/div>\n
\u00a0<\/div>\n
# yum install openssl-devel xinetd<\/div>\n
\u00a0<\/div>\n
# cd \/opt\/shashi<\/div>\n
\u00a0<\/div>\n
# wget http:\/\/sourceforge.net\/projects\/nagios\/files\/nrpe-<\/a><\/span><\/div>\n
2.x\/nrpe-2.13\/nrpe-2.13.tar.gz\/download<\/div>\n
\u00a0<\/div>\n
# tar xvf nrpe-2.13.tar.gz<\/div>\n
\u00a0<\/div>\n
# cd nrpe<\/div>\n
\u00a0<\/div>\n
# .\/configure<\/div>\n
\u00a0<\/div>\n
General Options:<\/div>\n
\u00a0<\/div>\n
————————-<\/div>\n
\u00a0<\/div>\n
NRPE port:5666<\/div>\n
\u00a0<\/div>\n
NRPE user:nagios<\/div>\n
\u00a0<\/div>\n
NRPE group:nagios<\/div>\n
\u00a0<\/div>\n
Nagios user: nagios<\/div>\n
\u00a0<\/div>\n
Nagios group: nagios<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# make all<\/div>\n
\u00a0<\/div>\n
# make install-plugin<\/div>\n
\u00a0<\/div>\n
# make install-daemon<\/div>\n
\u00a0<\/div>\n
# make install-daemon-config<\/div>\n
\u00a0<\/div>\n
# make install-xinetd<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
10.Enter the following entry :-<\/strong><\/div>\n
\u00a0<\/div>\n
# vim \/etc\/xinetd.d\/nrpe<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
only_from = 127.0.0.1 192.168.0.10 (nagios_ip_address<\/div>\n
)<\/div>\n
\u00a0<\/div>\n
11.Now, add entry for nrpe daemon to \/etc\/services file :-<\/strong><\/div>\n
\u00a0<\/div>\n
# vim \/etc\/services<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
nrpe 5666\/tcp # NRPE<\/div>\n
\u00a0<\/div>\n
# service xinetd restart<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# chkconfig xinetd on<\/div>\n
\u00a0<\/div>\n
12.Test NRPE Daemon Install :-<\/strong><\/div>\n
\u00a0<\/div>\n
# netstat -at |grep nrpe<\/div>\n
Output should be :<\/div>\n
\u00a0<\/div>\n
tcp 0 0 *:nrpe *.* LISTEN<\/div>\n
\u00a0<\/div>\n
13.Check NRPE Service :-<\/div>\n
\u00a0<\/div>\n
# \/usr\/local\/nagios\/libexec\/check_nrpe -H 192.168.0.10<\/div>\n
\u00a0<\/div>\n
Output should be NRPE version:<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
NRPE v2.12<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
-: CLIENT SETUP :-<\/strong><\/div>\n
\u00a0<\/div>\n
1.Package Requirement :-<\/strong><\/div>\n
\u00a0<\/div>\n
# yum install openssl-devel xinetd<\/div>\n
\u00a0<\/div>\n
# yum install httpd php<\/div>\n
\u00a0<\/div>\n
# yum install gcc glibc glibc-common<\/div>\n
\u00a0<\/div>\n
# yum install gd gd-devel<\/div>\n
\u00a0<\/div>\n
2.Create Nagios user and group :-<\/strong><\/div>\n
\u00a0<\/div>\n
# useradd -m nagios<\/div>\n
# passwd nagios
# usermod -G nagios\u00a0 nagios<\/div>\n
# groupadd nagcmd<\/div>\n
# usermod -a -G nagcmd nagios<\/div>\n
# usermod -a -G nagcmd apache<\/div>\n
\u00a0<\/div>\n
3.Create a Directary shashi :-<\/strong><\/div>\n
\u00a0<\/div>\n
# mkdir \/opt\/shashi<\/div>\n
\u00a0<\/div>\n
# cd \/opt\/shashi<\/div>\n
\u00a0<\/div>\n
# wget http:\/\/sourceforge.net\/projects\/nagios\/files\/nrpe-<\/a><\/span>2.x\/nrpe-2.13\/nrpe-2.13.tar.gz\/download<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# tar -xvf nrpe-2.13.tar.gz<\/div>\n
# cd nrpe<\/div>\n
\u00a0<\/div>\n
# .\/configure<\/div>\n
\u00a0<\/div>\n
General Options:<\/div>\n
\u00a0<\/div>\n
————————-<\/div>\n
\u00a0<\/div>\n
NRPE port: 5666<\/div>\n
NRPE user: nagios<\/div>\n
NRPE group: nagios<\/div>\n
Nagios user: nagios<\/div>\n
Nagios group: nagios<\/div>\n
\u00a0<\/div>\n
# make all<\/div>\n
\u00a0<\/div>\n
# make install-plugin<\/div>\n
\u00a0<\/div>\n
# make install-daemon<\/div>\n
\u00a0<\/div>\n
# make install-daemon-config<\/div>\n
\u00a0<\/div>\n
# make install-xinetd<\/div>\n
\u00a0<\/div>\n
Enter the following entry in :-<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# vim \/etc\/xinetd.d\/nrpe<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
only_from = 127.0.0.1 <192.168.0.10>(nagios_ip_address)<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
4.Now, add entry for nrpe daemon to \/etc\/services file<\/strong><\/div>\n
\u00a0<\/div>\n
# vim \/etc\/services<\/div>\n
nrpe 5666\/tcp # NRPE<\/div>\n
\u00a0<\/div>\n
# service xinetd start<\/div>\n
\u00a0<\/div>\n
# service xinetd restart<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# chkconfig xinetd on<\/div>\n
\u00a0<\/div>\n
5.Test NRPE Daemon Install<\/strong><\/div>\n
\u00a0<\/div>\n
# netstat -at |grep nrpe<\/div>\n
\u00a0<\/div>\n
Output should be:<\/div>\n
tcp 0 0 *:nrpe *.* LISTEN<\/div>\n
\u00a0<\/div>\n
This command run by server side :-<\/div>\n
# \/usr\/local\/nagios\/libexec\/check_nrpe -H 192.168.0.11 (client IP)<\/div>\n
\u00a0<\/div>\n
NRPE v2.12<\/div>\n
\u00a0<\/div>\n
# cd \/opt\/shashi<\/div>\n
\u00a0<\/div>\n
# wget http:\/\/prdownloads.sourceforge.net\/sourceforge\/nagiosplug\/nagios-<\/a><\/span>plugins-1.4.11.tar.gz<\/div>\n
\u00a0<\/div>\n
# tar xvf nagios-plugins-1.4.11.tar.gz<\/div>\n
\u00a0<\/div>\n
# cd nagios-plugins-1.4.11<\/div>\n
\u00a0<\/div>\n
# .\/configure –with-nagios-user=nagios –with-nagios-group=nagios<\/div>\n
\u00a0<\/div>\n
# make<\/div>\n
\u00a0<\/div>\n
# make install<\/div>\n
\u00a0<\/div>\n
# chkconfig –add nagios<\/div>\n
\u00a0<\/div>\n
# chkconfig nagios on<\/div>\n
\u00a0<\/div>\n
# \/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg<\/div>\n
\u00a0<\/div>\n
Total Warnings: 0<\/div>\n
\u00a0<\/div>\n
Total Errors: 0<\/div>\n
Things look okay – No serious problems were detected during the pre-flight check<\/div>\n
\u00a0<\/div>\n
6.All Plugin :-<\/strong><\/div>\n
\u00a0<\/div>\n
# cd \/usr\/local\/nagios\/libexec<\/div>\n
\u00a0<\/div>\n
# cp check_http check_tomcat<\/div>\n
# cp check_http check_jboss<\/div>\n
\u00a0<\/div>\n
GO TO SERVER SIDE :-<\/strong><\/div>\n
\u00a0<\/div>\n
# vim \/usr\/local\/nagios\/etc\/nagios.cfg<\/div>\n
\u00a0<\/div>\n
>Definitions for monitoring the local (Linux) host<\/div>\n
\u00a0<\/div>\n
cfg_file=\/usr\/local\/nagios\/etc\/objects\/localhost.cfg (add line)<\/div>\n
\u00a0<\/div>\n
cfg_file=\/usr\/local\/nagios\/etc\/objects\/client.cfg (add line)<\/div>\n
\u00a0<\/div>\n
# vim \/usr\/local\/nagios\/etc\/objects\/client.cfg<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
define host {<\/div>\n
\u00a0<\/div>\n
name client ; Name of this template<\/div>\n
\u00a0<\/div>\n
use generic-host ; Inherit default values<\/div>\n
\u00a0<\/div>\n
check_period 24×7<\/div>\n
\u00a0<\/div>\n
check_interval 5<\/div>\n
\u00a0<\/div>\n
retry_interval 1<\/div>\n
\u00a0<\/div>\n
max_check_attempts 10<\/div>\n
\u00a0<\/div>\n
check_command check-host-alive<\/div>\n
\u00a0<\/div>\n
notification_period 24×7<\/div>\n
\u00a0<\/div>\n
notification_interval 30<\/div>\n
\u00a0<\/div>\n
notification_options d,r<\/div>\n
\u00a0<\/div>\n
contact_groups admins<\/div>\n
\u00a0<\/div>\n
register 0 ; DONT REGISTER THIS – ITS A TEMPLATE<\/div>\n
\u00a0<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
define host {<\/div>\n
\u00a0<\/div>\n
use client ; Inherit default values from a template<\/div>\n
\u00a0<\/div>\n
host_name client ; The name we’re giving to this server<\/div>\n
\u00a0<\/div>\n
alias client ; A longer name for the server<\/div>\n
\u00a0<\/div>\n
address 192.168.0.11 ; IP address of the server<\/div>\n
}<\/div>\n
define service {<\/div>\n
\u00a0<\/div>\n
use local-service<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description PING<\/div>\n
\u00a0<\/div>\n
check_command check_ping!100.0,20%!500.0,60%<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
define service {<\/div>\n
\u00a0<\/div>\n
use local-service ; Name of service template to use<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description Disk Space<\/div>\n
\u00a0<\/div>\n
check_command check_disk!20%!10%!\/<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
define service {<\/div>\n
\u00a0<\/div>\n
use local-service ; Name of service template to use<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description Total Processes<\/div>\n
\u00a0<\/div>\n
check_command check_local_procs!150!300!RSZDT<\/div>\n
\u00a0<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
define service {<\/div>\n
\u00a0<\/div>\n
use local-service ; Name of service template to use<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description HTTP<\/div>\n
\u00a0<\/div>\n
check_command check_http<\/div>\n
\u00a0<\/div>\n
notification_interval 0 ; set > 0 if you want to be renotified<\/div>\n
\u00a0<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
define service {<\/div>\n
\u00a0<\/div>\n
use local-service<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description MySQL connection-time<\/div>\n
\u00a0<\/div>\n
check_command check_mysql_health!root!XXXX!connection-time<\/div>\n
\u00a0<\/div>\n
notifications_enabled 1<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
#define service {<\/div>\n
\u00a0<\/div>\n
use local-service<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description Tomcat<\/div>\n
\u00a0<\/div>\n
check_command check_tomcat<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
define service {<\/div>\n
\u00a0<\/div>\n
use local-service<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description Jboss<\/div>\n
\u00a0<\/div>\n
check_command check_jboss<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
define service {<\/div>\n
\u00a0<\/div>\n
use local-service<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description SSH<\/div>\n
\u00a0<\/div>\n
check_command check_ssh<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
define service {<\/div>\n
\u00a0<\/div>\n
use local-service ; Name of service template to use<\/div>\n
\u00a0<\/div>\n
host_name client<\/div>\n
\u00a0<\/div>\n
service_description Current Users<\/div>\n
\u00a0<\/div>\n
check_command check_local_users!20!50<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# vim \/usr\/local\/nagios\/etc\/objects\/command.cfg<\/strong><\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
################################################################################<\/div>\n
\u00a0<\/div>\n
# NOTE: The following ‘check_…’ commands are used to monitor services on<\/div>\n
\u00a0<\/div>\n
# both local and remote hosts.<\/div>\n
\u00a0<\/div>\n
################################################################################<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# ‘check_load’ command definition<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_procs<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_procs -w $ARG1$ -c $ARG2$ -s $ARG3$<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# ‘check_ftp’ command definition<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_ftp<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_ftp -H $HOSTADDRESS$ $ARG1$<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
# ‘check_http’ command definition<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_http<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_http -H $HOSTADDRESS$ -w 10 -c 20<\/div>\n
}<\/div>\n
# ‘check_ssh’ command definition<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_ssh<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_ssh $ARG1$ $HOSTADDRESS$<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# ‘check_ping’ command definition<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_ping<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_ping -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p 5<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# ‘check_remote_users’ command definition<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_remote_users<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_users -w $ARG1$ -c $ARG2$<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
# ‘check_disk’ command defintion<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_disk<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_disk -w 20% -c 10% -p \/dev\/sda1<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
# ‘check_mysql’comman definition<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_mysql_health<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_mysql_health -H $HOSTADDRESS$ –user $ARG1$<\/div>\n
–password $ARG2$ –mode $ARG3$<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
# ‘check_tomcat’comman definition<\/div>\n
\u00a0<\/div>\n
define command {<\/div>\n
\u00a0<\/div>\n
command_name check_tomcat<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_tomcat -H $HOSTADDRESS$ -p 8080 -w 4 -c 5<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
#’check_jboss’command definition<\/div>\n
\u00a0<\/div>\n
define command{<\/div>\n
\u00a0<\/div>\n
command_name check_jboss<\/div>\n
\u00a0<\/div>\n
command_line $USER1$\/check_jboss -H $HOSTADDRESS$ -p 4444 -w 4 -c 5<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
Check Configuration :-<\/div>\n
\u00a0<\/div>\n
# \/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
# \/etc\/init.d\/nagios restart<\/div>\n
\u00a0<\/div>\n
######################### Now Enjoy Working with Nagios ###########################<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\n

Installing nagios with nrpe to monitor remote hosts<\/h3>\n
\n
This post explains installing<\/span>nagios with nrpe to monitor remote hosts. Nagios is one of the most used monitoring tools today.<\/p>\n

On Remote client server<\/span> to be monitored:<\/p>\n<\/div>\n

\u00a0<\/div>\n
Create the user nagios and set password:<\/div>\n
# useradd nagios<\/div>\n
# passwd nagios<\/div>\n
\u00a0<\/div>\n
Download<\/span> the nagios plugin from http:\/\/www.nagios.org\/download\/plugins<\/a><\/div>\n
\u00a0<\/div>\n
# mkdir -p \/opt\/Nagios\/Nagios_Plugins<\/div>\n
# cd \/opt\/Nagios\/Nagios_Plugins<\/div>\n
# cd ..<\/div>\n
# wget http:\/\/prdownloads.sourceforge.net\/sourceforge\/nagiosplug\/nagios-plugins-1.4.15.tar.gz<\/a><\/div>\n
# tar xzf nagios-plugins-1.4.15.tar.gz<\/div>\n
# cd nagios-plugins-1.4.15<\/div>\n
\u00a0<\/div>\n
Compiling and Installing:<\/div>\n
Pere-requisite openssl-devel package.<\/div>\n
#rpm -q openssl-devel<\/div>\n
if not installed, then<\/div>\n
# yum -y install<\/span> openssl-devel<\/div>\n
\u00a0<\/div>\n
Configuring:\u00a0<\/div>\n
\u00a0<\/div>\n
# cd \/opt\/Nagios\/nagios-plugins-1.4.15<\/div>\n
# .\/configure –with-nagios-user=nagios –with-nagios-group=nagios<\/div>\n
If the configure struck with ICMP ping<\/span> check run as below<\/div>\n
.\/configure –with-nagios-user=nagios –with-nagios-group=nagios –with-ping-command=ping<\/div>\n
# make<\/div>\n
# make install<\/div>\n
\u00a0<\/div>\n
Changing permissions:<\/div>\n
# chown nagios.nagios \/usr\/local\/nagios<\/div>\n
# chown -R nagios.nagios \/usr\/local\/nagios\/libexec<\/div>\n
\u00a0<\/div>\n
Installing xinetd super demon if not installed<\/span><\/div>\n
# yum install xinetd<\/div>\n
\u00a0<\/div>\n
Now downloading<\/span> and installing nrpe demon from<\/div>\n
http:\/\/exchange.nagios.org\/directory\/Addons\/Monitoring-Agents\/NRPE–2D-Nagios-Remote-Plugin-Executor\/details<\/a><\/div>\n
\u00a0<\/div>\n
# mkdir -p \/opt\/Nagios\/Nagios_NRPE<\/div>\n
# cd \/opt\/Nagios\/Nagios_NRPE<\/div>\n
#cd ..<\/div>\n
#wget http:\/\/prdownloads.sourceforge.net\/sourceforge\/nagios\/nrpe-2.12.tar.gz<\/a><\/div>\n
# tar -xzf nrpe-2.12.tar.gz<\/div>\n
# cd nrpe-2.12<\/div>\n
\u00a0<\/div>\n
Compiling and Configuring nrpe<\/div>\n
# cd \/opt\/Nagios\/nrpe-2.12<\/div>\n
# .\/configure\u00a0<\/div>\n
# make all<\/div>\n
# make install-plugin<\/div>\n
# make install-daemon<\/div>\n
# make install-daemon-config<\/div>\n
# make install-xinetd<\/div>\n
\u00a0<\/div>\n
Add Nagios Monitoring server to the \u201conly_from\u201d directive<\/div>\n
# vi \/etc\/xinetd.d\/nrpe<\/div>\n
only_from = \u00a0<\/div>\n
\u00a0<\/div>\n
Add entry for nrpe daemon to services<\/div>\n
# vi \/etc\/services<\/div>\n
nrpe \u00a0 \u00a0 \u00a05666\/tcp \u00a0 \u00a0# NRPE<\/div>\n
\u00a0<\/div>\n
Restart Xinetd and set chkconfig on<\/div>\n
# chkconfig xinetd on<\/div>\n
# service xinetd restart<\/div>\n
\u00a0<\/div>\n
Checking whether NRPE daemon is running and listening<\/span> on port 5666:<\/div>\n
# netstat -at |grep nrpe<\/div>\n
tcp \u00a0 \u00a00 \u00a0 \u00a00 *:nrpe \u00a0 \u00a0*.* \u00a0 \u00a0LISTEN<\/span><\/div>\n
\u00a0<\/div>\n
Open Port 5666 on Firewall<\/div>\n
if using csf add 5666 to TCP_IN and TCP_OUT in \/etc\/csf\/csf.conf and restart as<\/div>\n
#csf -r<\/p>\n

And add the following lines to\u00a0\/usr\/local\/nagios\/etc\/nrpe.cfg<\/p>\n<\/div>\n

\n
command[check_users]=\/usr\/local\/nagios\/libexec\/check_users -w 5 -c 10<\/div>\n
command[check_load]=\/usr\/local\/nagios\/libexec\/check_load -w 15,10,5 -c 30,25,20<\/div>\n
command[check_hda1]=\/usr\/local\/nagios\/libexec\/check_disk -w 20% -c 10% -p \/dev\/hda1<\/div>\n
command[check_zombie_procs]=\/usr\/local\/nagios\/libexec\/check_procs -w 5 -c 10 -s Z<\/div>\n
command[check_total_procs]=\/usr\/local\/nagios\/libexec\/check_procs -w 150 -c 200<\/div>\n
command[check_disk]=\/usr\/local\/nagios\/libexec\/check_disk -w 20% -c 10% -p \/dev\/sda<\/div>\n
command[check_mem]=\/usr\/local\/nagios\/libexec\/check_mem 85 95<\/div>\n<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
Nagios server \u00a0Setup (mail nagios server)<\/div>\n
Downloading and installing nrpe demon from<\/div>\n
http:\/\/exchange.nagios.org\/directory\/Addons\/Monitoring-Agents\/NRPE–2D-Nagios-Remote-Plugin-Executor\/details<\/a><\/div>\n
\u00a0<\/div>\n
# mkdir -p \/opt\/Nagios\/Nagios_NRPE<\/div>\n
# cd \/opt\/Nagios\/Nagios_NRPE<\/div>\n
#cd ..<\/div>\n
#wget http:\/\/prdownloads.sourceforge.net\/sourceforge\/nagios\/nrpe-2.12.tar.gz<\/a><\/div>\n
# tar -xzf nrpe-2.12.tar.gz<\/div>\n
# cd nrpe-2.12<\/div>\n
\u00a0<\/div>\n
Compiling and Configuring nrpe<\/div>\n
# cd \/opt\/Nagios\/nrpe-2.12<\/div>\n
# .\/configure\u00a0<\/div>\n
# make all<\/div>\n
# make install-plugin<\/div>\n
\u00a0<\/div>\n
Check NRPE daemon is functioning from nagios server.\u00a0<\/div>\n
# \/usr\/local\/nagios\/libexec\/check_nrpe -H<\/div>\n
Output:<\/div>\n
NRPE v2.12<\/div>\n
\u00a0<\/div>\n
Check whether it is defined or not.<\/div>\n
# vi \/usr\/local\/nagios\/etc\/objects<\/span>\/commands.cfg<\/div>\n
define command{<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 command_name check_nrpe<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 command_line $USER1$\/check_nrpe -H $HOSTADDRESS$ -c $ARG1$<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 }<\/div>\n
\u00a0<\/div>\n
If you want to add a few ips then define them in hosts.cfg<\/div>\n
and make a hostgroup in hostgroups.cfg with all the needed users as members<\/div>\n
and now in services.cfg and the services you want and specidy hostgroup name as follows<\/div>\n
\u00a0<\/div>\n
### CPU LOAD\/Load Average ###<\/div>\n
define service{<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 use \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 basic-service<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 hostgroup_name \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0customer1<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 contact_groups \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0admins<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 service_description \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CPU LOAD<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 check_command \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 check_nrpe!check_load<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
### Disk Usage ###<\/div>\n
define service{<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 use \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 basic-service<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 hostgroup_name \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0customer1<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 contact_groups \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0admins<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 service_description \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CHECK DISK<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 check_command \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 check_nrpe!check_disk<\/div>\n
}<\/div>\n
\u00a0<\/div>\n
### RAM Usage ###<\/div>\n
define service{<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 use \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 basic-service<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 hostgroup_name \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0customer1<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 contact_groups \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0admins<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 service_description \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CHECK MEM<\/div>\n
\u00a0 \u00a0 \u00a0 \u00a0 check_command \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 check_nrpe!check_mem<\/div>\n
\u00a0<\/div>\n
Check the configuration \u00a0as :<\/div>\n
#\/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg<\/div>\n
Now restart<\/div>\n
#\/etc\/init.d\/nagios restart<\/div>\n<\/div>\n<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0<\/div>\n
\u00a0How to setup url or website monitoring in nagios server<\/span><\/div>\n

\u00a0<\/h3>\n

First of all create a configuration directory for writing the rules. You can also create the rules in localhost.cfg but I\u00a0recommend\u00a0 to create a separate directory and create the files in it.<\/p>\n

#mkdir \/etc\/nagios\/monitor_websites
and cd to this directory<\/p>\n

And create file host.cfg in this directory for setting the urls.
#vi host.cfg<\/p>\n

Suppose I want to monitor three sites
www.abc.com, www.xyz.com, www.pqr.com<\/p>\n

Configure host.cfg as below.
#vi host.cfg<\/p>\n

define host{
host_name \u00a0abc.com
alias \u00a0 \u00a0 \u00a0 \u00a0 abc
address \u00a0 \u00a0www.abc.com
use \u00a0 \u00a0 \u00a0 \u00a0generic-host
}<\/p>\n

define host{
host_name \u00a0xyz.com
alias \u00a0 \u00a0 \u00a0xyz
address \u00a0 \u00a0www.xyz.com
use \u00a0 \u00a0 \u00a0 \u00a0generic-host
}<\/p>\n

define host{
host_name \u00a0pqr.com
alias \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 pqr
address \u00a0 \u00a0www.pqr.com
use \u00a0 \u00a0 \u00a0 \u00a0generic-host
}<\/p>\n

#Defining group of urls \u00a0– you should add this if you want to set up an HTTP check service.
define hostgroup {
hostgroup_name \u00a0 \u00a0monitor_websites
alias \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 monitor_urls
members \u00a0 \u00a0 \u00a0 \u00a0 www.abc.com, www.xyz.com, www.pqr.com
}
:wq #save it<\/p>\n

And now create the file services.cfg for setting the service ( http_check )<\/p>\n

#vi services.cfg
## Hostgroups services ##
define service {
hostgroup_name \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 monitor_websites
service_description \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 HTTP
check_command \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 check_http
use \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 generic-service
notification_interval \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 0
}<\/p>\n

Now give the permissions for directory and configuration files.
#chown \u00a0-R nagios:nagios monitor_websites<\/p>\n

List and check.
[root@mail nagios]# \u00a0ll monitor_websites
total 16
-rw-r–r– 1 nagios nagios 669 Apr 25 23:13 host.cfg
-rw-r–r– 1 nagios nagios 253 Apr 25 23:15 services.cfg
[root@mail nagios]#<\/p>\n

Now give the configuration directory path in main nagios configuration file.
#vi \/etc\/nagios\/nagios.cfg
cfg_dir=\/etc\/nagios\/monitor_websites
:wq<\/p>\n

Now restart the nagios service.
#service nagios restart<\/p>\n

Thats it. Check the nagios site. You are done. You rocks.<\/p>\n

\u00a0How to install and configure Nagios Monitoring tool in redhat linux rhel5 or centos<\/strong><\/p>\n

This article will help you to install and configure Nagios monitoring tool in redhat linux or other redhat distributions like fedora, centos etc.
Nagios Installation :<\/strong>
Installing packages. Apache, PHP, GCC & GD<\/p>\n

Installing Apache web server:<\/strong>
#yum -y install httpd*
set hostname in FQDN
#service httpd on

<\/strong>
Installing PHP, GCC and GD:<\/strong>
#yum -y install php*
#yum -y install gcc*
#yum -y install gd*<\/p>\n

Getting the package:<\/strong>
Get the latest packages from net. Mov it to some directory and untar them.<\/p>\n

#wget http:\/\/prdownloads.sourceforge.net\/sourceforge\/nagios\/nagios-3.2.0.tar.gz
#mv nagios-3.2.0.tar.gz\u00a0 \/usr\/local\/src
#tar xvf nagios-3.2.0.tar.gz<\/p>\n

#wget http:\/\/prdownloads.sourceforge.net\/sourceforge\/nagiosplug\/nagios-plugins-1.4.14.tar.gz
#mv nagios-plugins-1.4.14.tar.gz\/usr\/local\/src
#tar xvf nagios-plugins-1.4.14.tar.gz<\/p>\n

Adding nagios user and setting password for that user:<\/strong>
#useradd nagios
#passwd nagios
usermod -a -G nagios apache\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/To permit the commands through web interface.<\/p>\n

Configuration of Nagios:<\/strong>
cd \/usr\/local\/src\/nagios-3.2.0<\/p>\n

.\/configure
make all
make install
make install-init
make install-config
make install-commandmode
make install-webconf<\/p>\n

Admin account setting for nagios:<\/strong>
htpasswd -c \/usr\/local\/nagios\/etc\/htpasswd.users nagiosadmin\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/passwd\u00a0 for web interface
give passwd
service httpd restart<\/p>\n

Nagios Plugin installation:<\/strong>
install nagios – pluggin<\/p>\n

cd \/usr\/local\/src\/nagios-plugins-1.4.14
.\/configure
make
make install<\/p>\n

Creating entry in \/etc\/init.d\/: <\/strong>
chkconfig –add nagios
chkconfig nagios on<\/p>\n

Checking the configuration:<\/strong>
\/usr\/local\/nagios\/bin\/nagios -v \/usr\/local\/nagios\/etc\/nagios.cfg<\/p>\n

Nagios Alert Plugin – Mozilla Addon:<\/strong>
Name : Nagios Checker
[give name and url]<\/p>\n

Configuring remotehost in nagios:<\/strong>
cp \/usr\/local\/nagios\/etc\/objects\/localhost.cfg\u00a0 \/usr\/local\/nagios\/etc\/objects\/remotehost.cfg
[comment the hostgroup entries in order to prevent duplicate entries]
[change the localhost entries to the remote machine hostname and IP address.]<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Nagios<\/p>\n

Firewall and SElinux is Disable <\/p>\n

Server IP :- 192.168.0.10 Hostname :- shashi.example.com Client IP :- 192.168.0.11 Hostname :- client.example.com 1.Package Requirement :- # yum install httpd php # yum install gcc glibc glibc-common # yum install gd gd-devel 2.Create Nagios user and group :- # useradd -m nagios # passwd nagios # usermod […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[41],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/1648"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1648"}],"version-history":[{"count":9,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/1648\/revisions"}],"predecessor-version":[{"id":1653,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/1648\/revisions\/1653"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}