Alerting On Log Events With Nagios Log Server
This article covers Alerting On Log Events With Nagios Log Server. Basically, for alerting on Log Events with Nagios Log Server one needs to be familiar with the options available.
With this guide, you will learn how to create various alerts in Nagios Log Server, such as sending
them to a Nagios XI or Nagios Core monitoring server using Nagios Remote Data Processor
(NRDP), sending an email, sending SNMP traps and executing scripts.
Analyzing Logs With Nagios Log Server
This article covers how to analyze logs with Nagios Log Server. Basically, in order to analyze logs with Nagios Log Server one needs to be familiar with the options in the Dashboards menu. This guide is very essential to Nagios Log Server administrators and users looking for information on querying, filtering and drilling down the data in Nagios Log Server.
You can audit your IT infrastructure, maintain historical records of usage of IT infrastructure, create reports, and analyze logs using the Nagios Log Server.
Access denied to VNC Server - How to fix this error ?
This article covers methods to fix the error, Access denied to VNC Server. Basically, this error occurs while trying to connect to a VNC server using a cloud connection. This message means that your RealVNC account has been signed out of VNC Viewer.
This will happen if you have recently changed the password for your RealVNC account, for example.
To resolve this VNC connection issue, click Sign in again and enter your RealVNC account credentials.
Once you see a green tick/check mark in the top right next to your name, try connecting to the VNC Server again.
SNMP Trap Hardening in Nagios - How it Works ?
This article covers how to go about SNMP Trap Hardening in Nagios.
When using the vi editor:
1. To make changes press i on the keyboard first to enter insert mode
2. Press Esc to exit insert mode
3. When you have finished, save the changes in vi by typing :wq and press Enter
How to Send Test Trap ?
When working through this documentation you may want to test the changes by sending a test trap. The following KB article provides examples on how to send a test trap, which can be very helpful:
How To Send A SNMP Test Trap ?
When a test trap is received on the Nagios XI server it should be logged in the /var/log/snmptt/snmpttunknown.log file.
The default SNMP Trap configuration is stored in the /etc/snmp/snmptrapd.conf file and contains just two lines:
disableAuthorization yes
traphandle default /usr/sbin/snmptthandler
NRPE Command Plugin Not Defined - How to fix it ?
This article covers methods to resolve 'NRPE Command Plugin Not Defined' for our customers.
This error is very straight forward. Usually this is caused by a mismatch between the command name declared in Nagios XI to be check through NRPE and the actual command name of the command directive in the remote host's nrpe.cfg file.
This problem will occur in versions of check_nrpe before v3.
What is happening here is that the initial -c check_users is being overwritten by the -a -w 5 -c 10, as check_nrpe thinks the -c 10 argument is the command argument, not one of the -a arguments.
SNMP Trap v3 Configuration in Nagios - How to get it done ?
This article covers How to configure SNMP Trap v3 on the Nagios XI server.
The main difference between v2 and v3 traps is the authentication mechanisms. v2 is much simpler by design whereas v3 has multiple layers of authentication to strengthen it. Probably the biggest difference is that the SNMP Trap Daemon (snmptrapd) is configured by default to accept v2 traps from any device regardless of what SNMP community is provided.
However snmptrapd cannot be configured to accept traps v3 from any device, it must be configured before it can receive an SNMP v3 trap.
The default SNMP Trap configuration is stored in the /etc/snmp/snmptrapd.conf file and contains just two lines:
disableAuthorization yes
traphandle default /usr/sbin/snmptthandler
The disableAuthorization directive allows SNMP v2 traps from any device to be sent to Nagios XI.
Even if this line exists the Nagios XI server will not be able to receive SNMP v3 traps unless the server has been specifically configured for SNMP v3 traps.
