[webmin-l] "Ping monitoring" with Webmin fails repeatedly, but is often false positive?

[Joaquim H. <jo...@we...>]

We use Webmin for basic monitoring of a number of servers. We usually 
set the check interval to somewhere between 15 and 30 minutes, depending 
on which server it is.

Quite often, we'll get a "monitor down" for a server, at which point we 
check the server and find it to be very much up and running. On the next 
check, Webmin will again report the server (or monitor) to be up. We 
typically see this reported from "monitoring servers" that have a lot of 
checks defined. Could this somehow confuse Webmin or congest the network 
stack somehow?

If this only happened once or on one server, I wouldn't worry so much 
about it. But we recently switched one of our "bigger" monitoring 
servers from one cloud platform to another, which completely different 
architecture behind it, and then re-created the monitors on the new 
server. Sure enough, pretty soon we began seeing false positives again.

(By the way, it'd be nice if one could export monitors and then 
re-import them on another server)



-joho