Re: [monit] Question about multi-host testing

[Martin Pala]

The icmp test is part of host check only. If you want to check more 
hosts, you thus need to specify one "check host" per each host and use 
dependency to set the relationship. Example:

--8<--
check yourswitch with address 10.10.10.2
  if failed icmp then alert

check yourneighbour with address 10.10.10.10
  if failed icmp then alert
  depends on yourswitch

check yourrouter with address 10.10.10.1
  if failed icmp then alert
  depends on yourswitch

check remoterouter with address 192.168.1.1
  if failed icmp then alert
  depends on yourswitch
  depends on yourrouter

check remoteswitch with address 192.168.1.2
  if failed icmp then alert
  depends on yourswitch
  depends on yourrouter
  depends on remoterouter

check remotehost with address 192.168.1.10
  if failed icmp then alert
  depends on yourswitch
  depends on yourrouter
  depends on remoterouter
  depends on remoteswitch
--8<--

Monit currently supports soft dependency, which provides correct 
sequence ... the hard dependency support is planned:

http://www.tildeslash.com/monit/doc/next.php#27


Martin



Pablo Iranzo Gómez wrote:
>         Hi
>         I would like to do a chain-testing for connectivity using the ICMP
> test, for example:
>
>         If you have this network layout:
>
>         Your computer -> a computer in your same switch -> the switch -> router
> -> remote router -> remote switch -> remote computer
>
>
>         It doesn't make sense to report a connectivity problem with remote
> computer, if every step in the chain could fail, so to correclty
> determine the problem you would need something like:
>
>         Chech host remotecomputer with address 10.10.10.10
>           if passed host yourneighbour then
> 	    if passed host yourswitch then 
> 	      if passed host your router then 
> 	        if passed host remoterouter then 
> 	          if passed host remoteswitch then
>                      if failed host remotecomputer then alert
>
>         But afaik, ICMP doesn't accept specifying "host", as it is supposed to
> be inside a check host sentence... otherwise, using "depends" just works
> for starting/stoping services, not for chain-dependencing failures (like
> first check if you can ping your router before claiming host being down)
>
>         ¿There's anything that I could have not considered in order to archieve
> this?
>
>         Regards
>         Pablo
>         
>
>
>
>
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