Re: [hobbit] False alerts in hobbit

[Anna Jonna Armannsdottir <annaj (at) hi.is>]

On mán, 2008-11-10 at 18:11 +1100, Adam Goryachev wrote:
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> I have been battling false alerts with hobbit for quite some time
> (months or more), and am really starting to get quite frustrated.
> (Mostly in that I tend to ignore my SMS messages because there are so
> many FP's...
> 
> Anyway, the fault is that the hobbit client reports get truncated, yet
> the hobbit server uses the portion that it gets. This usually results in
> the procs, ports, or both columns going red due to non-running
> procs/non-open ports. In reality, the proc/port is fine, just the data
> was truncated so the hobbit server couldn't find it.
> 
> Initially I discovered my hobbit server was truncating some of this
> data, so I increased the relevant variables:
> MAXLINE="65535"
> MAXMSG_STATUS="2048"
> MAXMSG_CLIENT="2048"
> MAXMSG_DATA="4096"

# Anna added 2008-09-08 because of lots of truncations. 
MAXLINE="32768"
MAXMSG_STATUS="1024"
MAXMSG_DATA="1024"
MAXMSG_CLIENT="2048"
MAXMSG_NOTES="1024"

After I added this, the problem was solved. I found the 
sizes from the truncations reported in the logs. 

> However, I still get many red alerts, and when I check, the log files do
> not report any truncated or oversized messages. Also, when I examine the
> "Client data available" from the red hobbit report, I find the size of
> the message is nowhere near any value above, and in fact is always
> different... Some reports that work are longer than reports that don't
> work etc...

Your logs - do they not report truncated or oversized messages like 
in the following message: 
http://www.hswn.dk/hobbiton/2006/05/msg00176.html 

> It isn't 100%, but generally (more than 98%) the clients with the
> problem are on bandwidth limited networks.
> 
> I would appreciate if anyone can provide any tips on how to make things
> more reliable?
> 
> Options I have considered:
> 1) Get hobbit to compress it's data, which reduces network load, and
> hence should improve reliability.
> 2) Add a "END" tag to the hobbit client data, and if the server doesn't
> get the END tag then ignore the whole file (or re-request it)
> 3) Switch to polling mode (which effectively does 1 && 2 I suppose)
> 4) Try and track down what is causing this, and fix it...
> 
> My hobbit server is behind a NAT router, so one possibility I have
> considered is the NAT router is dropping the map before the end of the
> TCP connection due to too many other connections or similar.

Have you considered setting up a Hobbit proxy. See:
http://www.hswn.dk/hobbiton/2007/06/msg00080.html

-- 
Kindest Regards, Anna Jonna Ármannsdóttir,       %&   A: Because people read from top to bottom.
Unix System Aministration, Computing Services,   %&   Q: Why is top posting bad?
University of Iceland.