1) Load and compile MIBS to Nagios
This is the command to compile MIBS to Nagios server:
snmpttconvertmib --in=
It would be tedious if there are too many MIBs files. Therefore, I wrote a simple bash script called “loadMIBS to compile all the MIBS in a folder.
if [ $# -ne 2 ]; then
echo "loadMIBS 'folder' 'device'"
exit 1
fi
for file in $( ls $1 ); do
/usr/sbin/snmpttconvertmib --in=$1\/$file \
--out=/etc/snmp/snmptt.conf.$2 \
--exec='/usr/local/nagios/libexec/eventhandlers/submit_check_result $r TRAP 1'
echo "MIBS loaded in /etc/snmp/snmptt.conf.$2"
done
2) Inform SNMPTT on the newly compiled Files
Modify /etc/snmp/snmptt.ini to include the earlier files:
[TrapFiles]
snmptt_conf_files =
/etc/snmp/snmptt.conf.devicename1
/etc/snmp/snmptt.conf.devicename2
END
3) Add the new Device to Nagios configuration file
I have created a standard file to consolidate all SNMP Trap devices at /usr/local/nagios/etc/objects/snmptrap.cfg. Just follow the example below:
define host{
use windows-server ; Inherit default values from a template
host_name HostA
alias HostA
address xx.xx.xx.xx ; IP address of the host
}
define host{
use windows-server ; Inherit default values from a template
host_name HostB
alias HostB
address xx.xx.xx.xx ; IP address of the host
}
define hostgroup{
hostgroup_name snmp_group ; The name of the hostgroup
alias SNMP TRAP
members HostA, HostB
}
define service{
hostgroup_name snmp_group
use snmptrap-service
contact_groups netadmin ; Who to alert & contact
}
4) Define New TRAP service on Nagios
Separately, on the templates.cfg, I have added this SNMP trap service
# define snmp trap service for network
define service{
use generic-service
name snmptrap-service
check_command check-host-alive
service_description TRAP
passive_checks_enabled 1
register 0
is_volatile 1
check_period none
max_check_attempts 1
normal_check_interval 1
retry_check_interval 1
notification_interval 31536000
notification_options w
}
Red: Make sure that the service description must match the submit_check_result parameter i.e. TRAP in this case. Otherwise, Nagios won't be able to match the recieved snmp trap to the passive service.
5) Verifying New SNMP Trap Service
- Check that the snmp trap daemon is running i.e. ps -e | grep trap
- Check the snmptt log that the trap is received
- Click on the "Event Logs" of Nagios admin console. Check that the event handler "submit_check_result" is executed correctly.
