[Xymon] localmode, got over-size message, truncating

[Jeremy Laidman]

Christoph

There's no limit on the client side. The log "Got oversized message,
truncating at ..." comes from xymond running on the Xymon server.

The limit for client messages (where your [ps] output is being truncated)
is defined by MAXMSG_CLIENT, set in xymonserver.cfg, as an integer for the
number of kibibytes (ie, it's multiplied by 1024). The default
MAXMSG_CLIENT is 512 (meaning 524288 bytes).

You've probably set the value correctly, but something else is preventing
it from being used. You can confirm that it's set correctly with something
like:

$ xymoncmd --env=/etc/xymon/xymonserver.cfg env | grep MAXMSG_CLIENT
MAXMSG_CLIENT=2048

If this gives the wrong value of 512, then there's something wrong with/in
the file xymonserver.cfg. If this gives the correct value, your xymond
probably just needs to be restarted so that it can pick up the
configuration change.

On Linux you can view the environment of a running process in
/proc/<pid>/env. This pseudo-file has null line terminators so running it
through "strings" makes it more palatable:

$ sudo -u xymon strings /proc/`pgrep -f '^xymond '`/environ | grep
MAXMSG_CLIENT
MAXMSG_CLIENT=2048

If you don't get the value that's set in xymonserver.cfg, kill the xymond
process and it'll restart using the current setting:

$ sudo -u xymon pkill -f '^xymond '

Cheers
Jeremy


On Tue, 8 Mar 2022 at 16:48, Christoph Zechner <zechner at vrvis.at> wrote:

>
> Hi,
>
> I've got a problem with a client running in local mode:
>
> from /var/log/xymon/xymonclient.log
>
> 2022-03-08 06:40:22.713067 Got over-size message, truncating at 528383
> bytes (max: 524288)
> 2022-03-08 06:40:22.725069 Dropping (more) garbled data
>
> I already increased the following values on the xymon server:
>
> MAXMSG_CLIENT=2048
> MAXMSG_STATUS=2048
>
> but it does not seem to have any effect on my client, because some
> checks (procs e.g.) still show up red respectively do not show all the
> data.
>
> Is there any other value I have to adjust? Where is the limit of 524288
> bytes defined on the client?
>
> Thanks in advance!
>
> Cheers
> Christoph
> _______________________________________________
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> Xymon at xymon.com
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