Nagios ( over ssh )

Akash Advanced Linux, Debian / Ubuntu, Server Configurations 
Configuring Nagios ( My Os is Ubuntu )

Before configuring nagios server configure the server as mail server/relay server

A. INSTALLATION

1) Download Source in /usr/local/src/

#wget http://liquidtelecom.dl.sourceforge.net/project/nagios/nagios-4.x/nagios-4.2.3/nagios-4.2.3.tar.gz
#wget --no-check-certificate https://nagios-plugins.org/download/nagios-plugins-2.1.4.tar.gz

tar -zxvf nagios-plugins-2.1.4.tar.gz

2) Add user and group

#useradd nagios
#groupadd nagcmd
#usermod -a -G nagcmd nagios
#usermod -a -G nagios,nagcmd www-data
 (* for centos this will be #usermod -a -G nagios,nagcmd apache)

3) Configuring and compiling source code nagios core:

#tar -zxvf nagios-4.2.3.tar.gz
#tar -zxvf nagios-plugins-2.1.4.tar.gz

#cd nagios-4.2.3

Install essential packages

#apt-get install snmp
#apt-get install snmpd
#apt-get install mrtg

(*for centos 
# yum install net-snmp-5.3.2.2-22.el5_10.1
#yum install net-snmp-libs-5.3.2.2-22.el5_10.1)

#./configure --with-command-group=nagcmd --with-mail=/usr/bin/sendmail –with-httpd-conf=/etc/apache2/sites-available/

(* for centos this will be #./configure --with-command-group=nagcmd )

#make all
#make install
#make install-init
#make install-config
#make install-commandmode
#make install-webconf
#cp -R contrib/eventhandlers/ /usr/local/nagios/libexec/
#chown -R nagios:nagios /usr/local/nagios/libexec/eventhandlers
#/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg

4) Configuring Apache

#sudo a2ensite nagios
#sudo a2enmod rewrite cgi ( enable mod rewrite in httpd for centos)
#service apache2 reload / restart

(* for centos it will be #/etc/init.d/httpd restart /reload)

#/etc/init.d/nagios start
#htpasswd -c /usr/local/nagios/etc/htpasswd.users nagiosadmin

5) Configuring and compiling source code nagios plugins

#cd ../nagios-plugins-2.1.4/
#./configure --with-nagios-user=nagios --with-nagios-group=nagios
#make
#make install
#sudo update-rc.d nagios defaults

(* for centos it will be 
#chkconfig --add nagios
#chkconfig --level 35 nagios on )

B. CONFIGURATION

On Client

#apt-get install libmysqlclient*-dev ( for check_mysql plugin its required )
(*For CentOS #yum install mysql51-mysql-libs.x86_64 )
#useradd nagios
#groupadd nagcmd
#usermod -a -G nagcmd nagios

#cd /usr/local/src
#wget --no-check-certificate https://nagios-plugins.org/download/nagios-plugins-2.1.4.tar.gz
#tar -zxvf nagios-plugins-2.1.4.tar.gz
#cd nagios-plugins-2.1.4
#./configure --with-nagios-user=nagios --with-nagios-group=nagios
#make
#make install

On Server

#su - nagios
#ssh-keygen

copy the content of the file id_rsa.pub to the file /home/nagios/.ssh/authorized_keys

#cd /usr/local/nagios/etc/objects

(write your own commands for remote servers which we are going to monitor via ssh agent. )

#vi remote-commands.cfg ( for example see my remote-commands.cfg at the end of the document.)

#cd /usr/local/nagios/etc

#vi nagios.cfg and add the below line

cfg_file=/usr/local/nagios/etc/objects/remote-eommands.cfg

#cd /usr/local/nagios/etc/objects

#vi hostgroups.cfg ( create your hostgroups. In localhost.cfg you can find how hostgrup is written. Sample files are at the end of the document )

cd /usr/local/nagios/etc

#vi nagios.cfg and add the below line

cfg_file=/usr/local/nagios/etc/objects/hostgroups.cfg

mkdir /usr/local/nagios/etc/objects/{Linux-Workstations,Windows-Workstations,Laptops,DRBL-Workstations,Local-Servers,Remote-Servers)

cd /usr/local/nagios/etc

#vi nagios.cfg and add the below lines

cfg_dir=/usr/local/nagios/etc/objects/Local-Servers

cfg_dir=/usr/local/nagios/etc/objects/Linux-Workstations

cfg_dir=/usr/local/nagios/etc/objects/Windows-Workstations

cfg_dir=/usr/local/nagios/etc/objects/Laptops

cfg_dir=/usr/local/nagios/etc/objects/Remote-Servers

copy the localhost.cfg to /usr/local/nagios/etc/objects/Linux-Workstations/<system-to-monitor-ip>.cfg ( for example I have 192.168.100.199 ip so i copied file as 192.168.100.199.cfg)

vim 192.168.100.199.cfg
 remove all hostgroup entries and make the changes accordingly




For remote system monitoring write the file /usr/local/nagios/etc/objects/remote-commands.cfg like below

define command{
 command_name check_remote_disk
 # command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_disk -w $ARG1$ -c $ARG2$ -e'
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_disk -w $ARG2$ -c $ARG3$ -A -I "/run/*" -I "/sys/*" -I "/dev/shm" -I "/dev" -I "/lib/*" -I "/var/lock" -I "/Thecus/*"'
 }

define command{
 command_name check_remote_load
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_load -w $ARG2$ -c $ARG3$'
 }

define command{
 command_name check_remote_swap
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_swap -w $ARG2$ -c $ARG3$'
 }

define command{
 command_name check_remote_users
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_users -w $ARG2$ -c $ARG3$'
 }

define command{
 command_name check_remote_procs
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_procs -w $ARG2$ -c $ARG3$'
 }

define command{
 command_name check_remote_ssh
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ssh -H $HOSTADDRESS$ $ARG1$'
 }

#define command{
 # command_name check_remote_mysql
 # command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_mysql -H $HOSTADDRESS$ $ARG1$'
 #}

define command{
 command_name check_remote_pgsql
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_pgsql -H $HOSTADDRESS$ -l $ARG2$ -p $ARG3$'
 }

define command{
 command_name check_remote_http
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_http -H $HOSTADDRESS$'
 }

define command{
 command_name check_remote_ldap
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ldap -H $HOSTADDRESS$ $ARG1'
 }

define command{
 command_name show_remote_users
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/show_users'
 }

define command{
 command_name check_remote_mysql
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_mysql -u $ARG2$ -p $ARG3$'
 }

define command{
 command_name check_remote_asterisk
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_asterisk'
 }

define command{
 command_name check_remote_ping
 command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $HOSTADDRESS$ -C '/usr/local/nagios/libexec/check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 5'
 }

define command{ command_name show_logged_users command_line /usr/local/nagios/libexec/check_by_ssh -p $ARG1$ -l nagios -t 30 -o StrictHostKeyChecking=no -H $ARG2$ -C '/usr/local/nagios/libexec/logged_users' }

For host write files like given (sample configuration geekonline.cfg )

define host{
 use                     remote-linux-server            ; Name of host template to use
 ; This host definition will inherit all variables that are defined
 ; in (or inherited by) the linux-server host template definition.
 host_name               GEEKHOST
 alias                   GeekHost
 address                 23.250.32.8
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             PING
 check_command            check_remote_ping!22!100.0,20%!500.0,60%
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Partitions
 check_command            check_remote_disk!22!20%!10%!/
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Current Users
 check_command            check_remote_users!22!20!50
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Total Processes
 check_command            check_remote_procs!22!250!400!RSZDT
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Current Load
 check_command            check_remote_load!22!5.0,4.0,3.0!10.0,6.0,4.0
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Swap Usage
 check_command            check_remote_swap!22!20!10
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             SSH
 check_command            check_ssh
 notifications_enabled        0
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             Logged in Users
 check_command                   show_remote_users!22!
 notifications_enabled           0
 }

define service{
 use                             local-service         ; Name of service template to use
 host_name                       GEEKHOST
 service_description             MYSQL
 check_command                   check_remote_mysql!22!root!<rootPassword>
 notifications_enabled           0
 }p

#/etc/init.d/nagios/restart

Open Nagions in browser
http://<ip>/nagios

One comment on “Nagios ( over ssh )”

  1. http://canadianorderpharmacy.com/ on said:

    Hi there, the whole thing is going perfectly here and ofcourse every one is sharing data, that’s truly excellent, keep up writing.

    Reply ↓

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