SNMP stands for simple network management protocol. It is a way that servers can share information about their current state, and also a channel through which an administer can modify pre-defined values. While the protocol itself is very simple, the structure of programs that implement SNMP can be very complex.
If you still didn’t install Nagios Core , check the following articles. How to Install and Configure Nagios on CentOS
In this article we will show you how to install and configure SNMP in the remote server and how to add the host to Nagios Core.
Scenario
In this tutorial i am going to use two systems as mentioned below.
Nagios server (host):
| Operating
system : CentOS 6 minimal server IP Address : 192.168.1.150/24 |
Nagios client (remote):
| Operating
System : CentOS 6 minimal server IP Address : 192.168.1.152/24 |
Installing SNMP Agent on remote machine
- Install SNMP and SNMP Utilities
- Add a Basic Configuration
- Test the SNMP Configuration
| yum -y install net-snmp net-snmp-utils |
| mv
/etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.orig cp /dev/null /etc/snmp/snmpd.conf vim /etc/snmp/snmpd.conf |
Insert the following text into the new /etc/snmp/snmpd.conf
| # Map
'idv90we3rnov90wer' community to the 'ConfigUser' # Map '209ijvfwer0df92jd' community to the 'AllUser' # sec.name source community com2sec ConfigUser default idv90we3rnov90wer com2sec AllUser default 209ijvfwer0df92jd # Map 'ConfigUser' to 'ConfigGroup' for SNMP Version 2c # Map 'AllUser' to 'AllGroup' for SNMP Version 2c # sec.model sec.name group ConfigGroup v2c ConfigUser group AllGroup v2c AllUser # Define 'SystemView', which includes everything under .1.3.6.1.2.1.1 (or .1.3.6.1.2.1.25.1) # Define 'AllView', which includes everything under .1 # incl/excl subtree view SystemView included .1.3.6.1.2.1.1 view SystemView included .1.3.6.1.2.1.25.1.1 view AllView included .1 # Give 'ConfigGroup' read access to objects in the view 'SystemView' # Give 'AllGroup' read access to objects in the view 'AllView' # context model level prefix read write notify access ConfigGroup "" any noauth exact SystemView none none access AllGroup "" any noauth exact AllView none none |
Exit vim, and restart the SNMP service to reload the new configuration file:
on Centos 6.x
| service snmpd restart |
on Centos 7.x
| systemctl restart snmpd |
Configure SNMP to start when the server boots:
on Centos 6.x
| chkconfig snmpd on |
on Centos 7.x
| systemctl enable snmpd |
from localhost on remote
| snmpwalk -v 2c -c 209ijvfwer0df92jd -O e 127.0.0.1 |
from nagios host
| snmpwalk -v 2c -c 209ijvfwer0df92jd -O e 192.168.1.152 |
- Install plugins check_cpu for snmp download from below
- Insert the following text into /usr/local/nagios/etc/objects/commands.conf
- Insert the following text into /usr/local/nagios/etc/servers/hostname.cfg
- Restart Nagios
| https://exchange.nagios.org/directory/Plugins/Operating-Systems/Solaris/check_cpu/details |
Put check_cpu into your Nagios libexec directory
(e.g. /usr/local/Nagios/libexec, or wherever Nagios is installed on your server)
Create the symbolic links, being careful not to overwrite any files by the same name already there
| ln -s check_cpu check_load ln -s check_cpu check_ram ln -s check_cpu check_swap |
(these symlinks dictate how the script is run, as it can check CPU, RAM, load and swap, depending on how it is invoked)
#snmp check_cpu define command{ command_name check_cpu command_line $USER1$/check_cpu -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p $ARG3$ } define command{ command_name check_swap command_line $USER1$/check_swap -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p $ARG3$ } define command{ command_name check_ram command_line $USER1$/check_ram -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p $ARG3$ -o $ARG4$ } define command{ command_name check_load command_line $USER1$/check_load -H $HOSTADDRESS$ -w $ARG1$ -c $ARG2$ -p $ARG3$ } |
define host{ use linux-server host_name hostname alias hostname address 192.168.10.70 max_check_attempts 5 check_period 24x7 notification_interval 30 notification_period 24x7 } # Check CPU with check_cpu snmpd define service{ use local-service ; Name of service template to use host_name hostname service_description Check CPU check_command check_cpu!70%!80%!209ijvfwer0df92jd } define service{ use local-service ; Name of service template to use host_name hostname service_description Check Swap Memory check_command check_swap!70!90!209ijvfwer0df92jd } define service{ use local-service ; Name of service template to use host_name hostname service_description Check Memory check_command check_ram!70!90!209ijvfwer0df92jd } define service{ use local-service ; Name of service template to use host_name hostname service_description Check Load Average check_command check_load!60,70,80!70,80,90!209ijvfwer0df92jd } |
Next, verify Nagios Configuration files for any errors.
| /usr/local/nagios/bin/nagios
-v /usr/local/nagios/etc/nagios.cfg Total Warnings: 0 Total Errors: 0 |
Finally, restart Nagios.
On Centos 6.x
| service nagios restart |
On Centos 7.x
| systemctl restart nagios |
Log into the web interface via : http://[SERVER_IP]/nagios , enter your login information and check for new Linux hosts added in nagios core service.
That’s all.
Congratulations! Enjoy your Monitoring platform Nagios Core.
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