Re: [Spong-users] Spong for a High Availability cluster

[Stephen L J. <sjo...@mo...>]

> Hi all!
> I'm using Spong in a cluster of three nodes. I want to check the network 
> services every 180 seconds so I put the the SLEEP variable to 180. But as I 
> have Spong on every server each one check the servers listed at spong.hosts 
> every 180 sec. so I can't control that they do the check at the same time.

You will not be able to keep the spong-network's in sync. The Spong programs 
are designed to stay out of sync. They will sleep the amount you specify +/- 
10%. Imagine 200+ servers booting up some type of outage. All 200 
spong-clients trying to send status messages to the spong-server at once. Poor 
little spong-server... :)

> 
> I have the three servers in the variable SPONGSERVER for the three nodes, so 
> each one is server of each other, I tried to put in spong.hosts just one 
> server -the localhost- and in spong.groups the three servers, but after 
> doing it the server was receiving client-data just of itself and when 
> viewing "groups" in the browser the others were in purple.

The purple servers are old, stale data. They haven't been updated in 3 x 
$SPONGSLEEP{'spong-network'} seconds. Check your $SPONGTMP/spong-network.log 
or syslog log files for connectivity errors all of the servers.


> 
> How can I sinchronize the checks for the cluster?

Even if you eliminate the randomness from the SLEEP code. If will be had to 
keep the spong-network programs in sync. A check may fail on the first try, a 
server may have a little bit longer response time than the other servers, etc.




> 
> I would like receive any advice for using Spong on a high availability 
> cluster.