[Xymon] no client results arrive, lot of TIME_WAIT at server

[Norbert Kriegenburg]

Yes,
that's what i checked at first. But i assume that also the info from the
servers own client data are captured by the same client channel listener,
and that obviously works.

Nothing in the clientdata.log, even if i activate the DEBUG mode with a
kill -USR2 PID

My clientdata section:
# The client back-end module. You need this if you are running the Xymon
client on any system.
[clientdata]
        ENVFILE $XYMONSERVERHOME/etc/xymonserver.cfg
        NEEDS xymond
        CMD /home/xymon/server/bin/xymond_channel --channel=client \
                --log=$XYMONSERVERLOGS/clientdata.log xymond_client \
                --no-clear-files \
                --no-clear-ports \
                --no-port-listing \
                --uptime-status
        INTERVAL 2m

ps listing:
$ ps -ef|grep "xymond_channel --channel=client"|grep -v grep
xymon    18865 18705  0 05:13 ?
00:00:00 /home/xymon/server/bin/xymond_channel --channel=client
--log=/home/xymon/server/logs/clientdata.log xymond_client --no-clear-files
--no-clear-ports --no-port-listing --uptime-status

I have a lot of TIME_WAITS from time to time, no idea why this goes up and
down:

$ netstat -atn|grep 1984
tcp        0      0 0.0.0.0:1984            0.0.0.0:*               LISTEN
tcp        0      0 10.137.56.43:37752      10.137.56.43:1984
TIME_WAIT
tcp        0      0 10.137.56.43:37822      10.137.56.43:1984
TIME_WAIT
...

10.137.56.43 is the Xymon server IP.

$ netstat -atn|grep 1984|wc -l
165
(sometimes much much more)

(But goes down to 7 after some mins)




From:	Thomas Eckert <thomas.eckert at it-eckert.de>
To:	xymon <xymon at xymon.com>
Date:	19/10/2017 11:14
Subject:	Re: [Xymon] no client results arrive, lot of TIME_WAIT at
            server
Sent by:	"Xymon" <xymon-bounces at xymon.com>



Norbert,

I assume your manual (BB way) is something like `xymon 1.2.3.4 “status
example.com.test …”`.

The xymon-client send `clientdata` that is processed by a “channel
listener” and _that_ sends status-messages similar to above (a bit
simplified).

That channel-listener may not be running/crashing:
Check our `tasks.cfg` for the section `[clientdata]` and verify, if the
`xymond_channel`-process is running (I suspect it’s not). Maybe the
`clientdata.log` helps with debugging. You may also run the task manually
to get further information.

What’s your problem with the "lot of TIME_WAIT”? Are these just for
tcp/1984-connections?

Cheers
Thomas

      On 19 Oct 2017, at 07:30, Norbert Kriegenburg <
      norbert.kriegenburg at de.ibm.com> wrote:



      experts,

      i have a new (not my first) Xymon installation (4.3.28 on RH 7.4,
      self compiled).
      All looks good, but the clients only show the network tests (conn,
      ssh). Only the Xymon server itself shows everything (disk, cpu,...).
      - all clients are RH 7.4, same install image used (i just copied over
      the client part with client config, create a cronjob for automatic
      start, so no root access nor extra install needed)
      - nothing suspicious in server or client logs (even in debug mode)
      - no ghosts
      - if i send a test manually (the old BB way) this shows at Xymon
      immediately (so the client settings are ok)
      - if i shutdown the xymond at server, the client logs complains:

      2017-10-19 05:09:18.051994 Whoops ! Failed to send message
      (Connection failed)
      2017-10-19 05:09:18.052104 -> Could not connect to Xymon
      daemon at 10.137.56.43:1984 (Connection refused)

      (so obviously they communicate)

      Querying the xymond shows:
      xymon 127.0.0.1 "query clientname.ssh"
      green <!-- [flags:OrdastLe] --> Thu Oct 19 05:21:29 2017 ssh ok
      is ok, but
      xymon 127.0.0.1 "query clientname.disk"
      shows nothing

      Any ideas?

      Norbert


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