Nagios Add Remote Host - CentOS 7

Nagios Add Remote Host - CentOS 7

nagios configuration in Linux  step by step, monitoring tools of  Linux; nagios tutorial; nagios installation, nagios core, nagios plugins, nagios configuration, nagios monitoring
### Client Side Details & Configuration             
### OS - CentOS 7 64bit                
### IP - 172.17.25.100                 
### Hostname - webserver.example.com
  
Step 1:

Setup NRPE Service on Linux Host
vi /etc/hosts
nrpe-hosts.png

Install Package & Plugin
yum install epel*

yum install nrpe nagios-plugins*                               # CentOS/RHEL/Fedora

OR


apt-get install nagios-nrpe-server nagios-plugins     # Debian/Ubuntu/LinuxMint
nrpe2-install.png

Step 2:

Configure NRPE
   vi /etc/nagios/nrpe.cfg
#Add Nagios Server IP
allowed_hosts=127.0.0.1, 172.17.20.100
   
nagios configuration in Linux  step by step, monitoring tools of  Linux; nagios tutorial; nagios installation, nagios core, nagios plugins, nagios configuration, nagios monitoring

#Allow Argument
# Values: 0=do not allow arguments, 1=allow command arguments

dont_blame_nrpe=1

Step 3:

Add Command

# The following examples use hard-coded command arguments...

command[check_users]=/usr/lib64/nagios/plugins/check_users -w 5 -c 10
command[check_load]=/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_root]=/usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -p /dev/mapper/centos-root
command[check_total_procs]=/usr/lib64/nagios/plugins/check_procs -w 150 -c 200
command[check_swap]=/usr/lib64/nagios/plugins/check_swap -w 20 -c 10
command[check_http]=/usr/lib64/nagios/plugins/check_http -H 172.17.20.103

nagios configuration in Linux  step by step, monitoring tools of  Linux; nagios tutorial; nagios installation, nagios core, nagios plugins, nagios configuration, nagios monitoring

Step 4:

Restart Service

systemctl restart nrpe.service
or
service nrpe restart
or
sudo /etc/init.d/nagios-nrpe-server restart 
## Allow on Firewalld
firewall-cmd --add-port=5666/tcp --permanent

firewall-cmd --reload
### Server Side Configuration ######
### OS - CentOS 7 64bit       ######
### IP - 172.17.25.200       #####
### Hostname - nagios.linuxtopic.com ####

Step 5:

## Install nrpe
yum install openssl-devel xinetd unzip
# Download nrpe
cd /tmp

curl -L -O http://downloads.sourceforge.net/project/nagios/nrpe-2.x/nrpe-2.15/nrpe-2.15.tar.gz
nrpe4-source.png
tar xvf nrpe-2.15.tar.gz

cd nrpe-2.15

./configure --enable-command-args --with-nagios-user=nagios --with-nagios-group=nagiosgroup --with-ssl=/usr/bin/openssl --with-ssl-lib=/usr/lib/x86_64-linux-gnu
nrpe5-compile.png
make all
make install
make install-xinetd
make install-daemon-config
nrpe-6-make-install.png

# Test nrpe client
telnet <client ip> 5666

/usr/local/nagios/libexec/check_nrpe -H 172.17.25.100
Step 6:

 # Configure HOST
vi /usr/local/nagios/etc/servers/webserver.linuxtopic.cfg
## Host Details ###

define host {
       use                                   linux-server
       host_name                       webserver.linuxtopic.com
       alias                                 MyWeb
       address                           172.17.20.103
       max_check_attempts       10
       check_period                    24x7
       notification_interval           10       # Notification
       notification_period             24x7
}

# Define Group

define hostgroup{
       hostgroup_name             Webserver_Group
       alias                                 MyWebserver
#     members                        172.17.20.103
       }
####

# Check Ping

define service {
       use                                 generic-service
       host_name                       webserver.linuxtopic.com
       service_description             PING
       check_command                   check_ping!100.0,20%!500.0,60%
       check_interval                  1    # 1 min
       retry_interval                  1    # 1 min
}

# Define a service to check the load on the local machine.

define service{
       use                                local-service
       host_name                       webserver.linuxtopic.com
       service_description             Current Load
       check_command                   check_nrpe!check_load!15.0,12.0,10.0!20.0,18.0,15.0
       check_interval                  1
       retry_interval                  1
       }

# Check Users

define service{
       use                           generic-service
       host_name                 webserver.linuxtopic.com
       service_description        Current Users
       check_command            check_nrpe!check_users
       check_interval               1
       retry_interval               1
}

# Check Process

define service{
       use                                 local-service
       host_name                       webserver.linuxtopic.com
       service_description             Total Processes
       check_command                   check_nrpe!check_total_procs!250!400!RSZDT
       check_interval                  1
       retry_interval                  1
}

# Check Root Part.

define service{
       use                               local-service
       host_name                       webserver.linuxtopic.com
       service_description             Disk-Root-Partition
       check_command                   check_nrpe!check_root!10%!5%!/
       check_interval                  1
       retry_interval                  1
}

# Define a service to check the swap usage the local machine.
# Critical if less than 10% of swap is free, warning if less than 20% is free

define service{
       use                                 local-service
       host_name                       webserver.linuxtopic.com
       service_description             Disk-Swap-Partition
       check_command                   check_nrpe!check_swap!20!10
       check_interval                  1
       retry_interval                  1
}

## Check HTTP Server

define service{
       use                                local-service
       host_name                       webserver.linuxtopic.com
       service_description             WEB-HTTP
       check_command                   check_nrpe!check_http
       check_interval                  1
       retry_interval                  1
}



Previous
Next Post »