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loganathan
Asked: 2015-09-16 02:14:59 +0800 CST

How to monitor the connectivity between multiple machine

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I am using Nagios to monitor my servers and I have an need to monitor the inter connectivity between different servers. For example assume that I have three servers A, B & C and all of these servers are already monitored by nagios using check_ping plugin.

Now I want to check connectivity between these three servers internally, I mean from

server A, B & C should be reachable, likewise from B, A & C should be reachable , same for server C

What is the way to do this using nagios.

Server A - can ping to servers B&C 
Server B - can ping to servers A&C 
Server C - can ping to servers B&C

I have tried with multiple ping command in server A, but it is not helpful because i cant able to find out whether server B/C is not reacheable from A

command[check_ping]=/usr/lib64/nagios/plugins/check_ping -H 10.16.15.137 -w 3000.0,80% -c 5000.0,100% -p 5 
command[check_ping]=/usr/lib64/nagios/plugins/check_ping -H 10.18.42.125 -w 3000.0,80% -c 5000.0,100% -p 5 


where
10.16.15.137 -> SERVER B 
10.18.42.125 -> SERVER C
nagios

2 Answers

  1. Install the NRPE daemon on all 3 servers, and write different check commands, like check_ping_A, check_ping_B, check_ping_C, etc., on the different servers (in the NRPE config):

    command[check_ping_A]=/usr/lib64/nagios/plugins/check_ping -H x.x.x.x -w 3000.0,80% -c 5000.0,100% -p 5 
command[check_ping_B]=/usr/lib64/nagios/plugins/check_ping -H y.y.y.y -w 3000.0,80% -c 5000.0,100% -p 5

    You'd check B & C from A, A & C from B, etc. This is a simple approach, but it doesn't scale well.

    (Or write a generic check_ping that takes the address as an ARG and enable NRPE argument processing. This is more flexible, but some people are uneasy with this practice.)

    Then use check_nrpe on the Nagios server to check the various combinations. You can simply this slightly by using check_multi, especially if you want to check more than 3 servers in the future.

    • 2

  2. You can use NRPE on the servers to actually test the connection from there. On the nagios machine, you would use the check_nrpe plugin to get the results.

    NRPE essentially means you run Nagios plugins locally on a monitored host and get the results back to Nagios via the NRPE protocol.

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