HowTo: Monitoring RED Device State with Nagios

Hi folks,

in normal Site2Site VPN setups you could monitor the tunnel state by pinging the remote end of the vpn. If it doesn't respond it's down! Wink With the REDs being a local interface on the ASG it's no longer possible to check the tunnel state with ping.

We wrote a nagiosplugin which checks the link state of a given RED ID and returns OK when online and CRITICAL when offline. There are also some other values we report, on-/offline time and IP were it is connected from.

I'll give you a short description how to setup the plugin, expecting that you've got a running nagios environment:

1. Copy the check_asg_red_state.pl to your nagios plugn directory (normally /usr/local/nagios/libexec) and make it executable

2. Create a new check_command looking like this:
# 'check_' command definition

define command{
command_name check_asg_red_state
command_line $USER1$/check_asg_red_state.pl -H $HOSTADDRESS$ -R $ARG1$
}

3. You need to gennerate a key pair for the nagios user in order to use the passwordless authentication with the host. This can be done by running 
ssh-keygen -t rsa -N ""

as nagios user or
su - nagios -c 'ssh-keygen -t rsa -N "" '

4. Install your public key on your Astaro for passwordless login of loginuser.

5. Now you can test your setup:

nagios@debian:/usr/local/nagios/libexec$ ./check_asl_red_state.pl -H my.firewall.net -R A300001234567890
RED STATE OK - RED connected from 1.2.3.4, uptime 22h 15min | Uptime=1335min;;


Now you can start adding the REDs to your nagios configuration.

There maybe BUGs, please let me know if you found something unusual or if it doesn't work.

I hope this is helpful for other people, if you have questions feel free to ask!

Regards,
Cobotec GmbH

Mario Techel

Version 1.1:
- minor bugfixes, changed default value for StrictHostKeyChecking to no
check_asg_red_state_v1.1.zip
  • In reply to leo hamel:

    Hello leo,

    the check only works with the UTM/SG software. The XG software is completely different.

    If you only switch the hardware from SG model to XG model with the UTM software it works.

     

    If enough interest exists I'll try to have a look and get a new check for the XG OS 18.x versions.

  • In reply to DanielMüller1:

    thanks for reply!

    so i had UTM software and i switched to XG hardware..

     

    i was able to generate the key from Nagios for passwordless access but i dont know where to use it in the XG...my XG is XG230 (SFOS 17.5.5 MR-5)

     

    best