Icinga icon   Icinga – How to configure passive checks made easy (2)



In the previous post I explained what is the difference between Icinga active and passive checks, why can be interesting to use passive checks, what is the result format Icinga is expecting when processing those checks and the way I use to send those results (instead of using snmp traps).

Now it is time to show how to configure it … Read more

Icinga icon   Icinga – How to configure passive checks made easy (1)



As I posted long time ago for Nagios (Nagios – Using passive checks without agent), it is time to show an easy way to configure Icinga to perform passive checks (without using SNMP traps).

This is the first of two posts. In this I only want to make some theoretical explanations and then in the second I will … Read more

Icinga icon   Icinga – Cannot login to Grafana. Forgot admin password



It is not the first time my Icinga suddenlty, stops showing the grafana graphs.
Icinga when cannot show Grafana graphs

Problem

If trying to log to Grafana, admin password is not accepted. I am pretty sure i have not changed the password but I am unable to login to Grafana.
Invalid username or password when login to Grafana
And even worse, given that I still have not configured Grafana SMTP section / admin … Read more

Icinga icon   Icinga2 – Understanding checks and notification types



Here I am trying to present (I hope in an easy way to understand) some Icinga concepts (maybe also applicable in Nagios) like active and passive checks, enabling and disabling freshness checks, soft and hard states,… and the related parameters to configure them.

ACTIVE and PASSIVE services

There are two types of services:

  • ACTIVE: Check initiated by the Icinga
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Linux   Linux – Running top command remotely (SSH)



Maybe you have tried to execute the top command to monitor processes on a remote host.

Error remotely – Run it in batch mode

If so, the following error can be returned:

$ ssh user@remotehost top -n1
TERM environment variable not set.

top does not work remotely in the default “interactive” mode. Use the “-b” parameter to run it in Read more

Checkpoint   Checkpoint – Nagios plugin to monitor ARP table in VSX



When suffering random network interruptions, a possible cause (and diffcult to find) is our firewall ARP table overflow. In Checkpoint systems, the Linux kernel Gaia is based on would log messages like "kernel: neighbour table overflow" to /var/log/messages.

After living two small crisis due to this problem (network scanning software and mask B networks are dangerous for the … Read more

Checkpoint   Checkpoint – Nagios plugin to monitor VS active connections



Having our Checkpoint VSX Virtual System active connections under control can be very important to avoid problems, configure a higher connection limit, be ready for growth (and so scalate our environment)…

Nagios and SNMP can be used to configure a VS connection monitor plugin:
Checkpoint - Nagios plugin to monitor VS active connections 1

Steps needed to configure the plugin:

  1. SNMP OID for virtual systems active connections
  2. Develop an script
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EXCHANGE   Exchange – Monitor mailbox database copies using Nagios



This post shows a Powershell script I use to monitor the status of my Exchange mailbox database copies and raises a critical alert if any of them is not "Mounted" or "Healthy".
Exchange Nagios Database Copies OK

Exchange Nagios Database Copies Alert

The script takes advantage of the Nagios passive checks and the configurations shown on my previous post "Nagios – Using passive checks without agent".

Here is … Read more