Monitor Linux network interface traffic using nagios
To monitor network traffic on your systems using nagios there is the check_netio plugin on nagios exchange.
Here's the setup for debian systems:
For all monitores systems
Download the check_netio_1.1 to /usr/local/bin and test it. You will have to change paths, like this: check_netio_1.1_debian Copy this file to all your servers that you check by ssh.
On the nagios server only:
You need these commands to enable netio checking for a hostgroups based configuration.
# 'ssh_netio' command definition
define command{
command_name ssh_netio
command_line /usr/lib/nagios/plugins/check_by_ssh -H $HOSTADDRESS$ -C "/usr/local/bin/check_netio_1.1 -i $ARG1$"
}
define hostgroup {
hostgroup_name netio-servers
}
define service{ use generic-service ; Name of service template to use hostgroup_name netio-servers
service_description NETIO
check_command ssh_netio!eth0 }
To enable netio checking for a given host, add the entry netio-servers to the hostgroups of the host entry.
Restart nagios using /etc/init.d/nagios3 restart to make sure everything works. Nagios should check the NETIO service.
To enable nagiosgrapher display for the netio plugin copy the file check_netio_1.1_debian to /etc/nagiosgrapher/ngraph.d/extra/netio.ncfg
Restart nagiosgrapher and control /var/log/nagiosgrapher/ngraph.log. For every host where you enable netio checking, you should see the information that the config has been added.
Note:
- If you run a bastille hardened server, the plugin call by ssh may fail because ifconfig can't be executed. Test it using
/usr/lib/nagios/plugins/check_by_ssh -H newton.ksk.ch -C '/usr/local/bin/check_netio_1.1 -i eth0'
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