Nrpe.conf Enteries – mysql, exim, dns, zombie

vi /etc/nrpe.conf

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10

command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20

command[check_disk1]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 -p /dev/hda1

command[check_disk2]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 -p /dev/hdb1

command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z

command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200

command[check_mysql]=/usr/local/nagios/libexec/check_mysql -H 209.85.53.165

command[check_eximmailqueue]=/usr/local/nagios/libexec/check_eximmailqueue -w 20 -c 100

command[check_swap]=/usr/local/nagios/libexec/check_swap -w 99% -c 90%

command[check_dns]=/usr/local/nagios/libexec/check_dns -H 209.85.53.165

command[check_http]=/usr/local/nagios/libexec/check_http -H 209.85.53.165

Nagios tool for Monitoring Multiple Remote Server from one server

Nagios tool(open source) can be used to monitor several servers(both linux and windows) from one server called as Nagios server.

Used to monitoring,

load average

no.of users

mysql status

mail status

zombie process

apache status

free memory

Complete steps to install and configure nagios and nrpe, both in remote and nagios server

Nagios

1. 1) Getting Nagios

You need root access on the server, where you would like to install Nagios. Login as root.

Create a directory for downloads.

#mkdir -p /usr/src/backs/nagios
#cd /usr/src/backs/nagios

Download source of nagios and nagios-plugins at http://www.nagios.org/download/.

1. 2) Compilation and installation of Nagios

Login as root and create a user, say “nagios”

useradd nagios
passwd nagios

Changing password for user nagios.
New UNIX password:
Retype new UNIX password:
passwd: all authentication tokens updated successfully.

In some servers normal users may not have permission to use ‘mail’ inorder to send alerts.

usermod -G mail nagios

Make a directory for working with the source code.

mkdir -p /usr/src/works/nagios
cd /usr/src/works/nagios/
tar -zxvf /usr/src/backs/nagios/nagios-1.2.tar.gz
cd nagios-1.2/
./configure --prefix=/usr/local/nagios --with-cgiurl=/nagios/cgi-bin --with-htmurl=/nagios/ --with-nagios-user=nagios --with-nagios-group=nagios –with-command-group=nagios
make all
make install
make install-init 			# Needed to add the service 'nagios'.
make install-commandmode
make install-config

3) Install Nagios Plugins

Plugins are usually installed in the libexec/ directory of your Nagios installation (i.e. /usr/local/nagios/libexec). 

Download the latest version of nagios Plugins from the following

http://sourceforge.net/projects/nagiosplug/

cd ../
tar -zxvf /usr/src/backs/nagios/nagios-plugins-1.3.1.tar.gz
cd nagios-plugins-1.3.1/
./configure

make
make check
make install
This should install the pugins in the /usr/local/nagios/libexec directory.