Hi Jeff,thx. Last week I disabled the ping-thread on master and slaves by
setting the interval to '-1'.Unfortunately, over the weekend, again one of the
slaves (even though the jobs kept on running),went into 'offline' mode. It
seems indeed that this does not solve the issue. Or, iow I think it meansthat
the disconnect was not caused by the ping-thread(s) timing out.
Which puts me to the challenge to figure out what could be this 'external
someting' that you mentionthat would break the remoting. And I honestly have no
idea how to tackle that yet.
The master, as well as the slave are Windows server VM's running 6 executor
slots each. The
tests we are running heavily use TCP communication.
Any idea how to tackle this ?
thx, M. On Thursday, April 9, 2020, 10:53:48 PM GMT+2, Jeff Thompson
<jthomp...@cloudbees.com> wrote:
On 4/7/20 11:46 PM, 'monger_39' via Jenkins Users wrote:
Hi,
in my Jenkins I am regularly facing master/slave connection drops with a
message like:
hudson.remoting.ChannelClosedException: Channel "unknown": Remote
call on JNLP4-connect connection from IP/IP:58344 failed.
The channel is closing down or has closed down.
Usually these are caused by something external to the Remoting communication
protocol. Most often by something in the system or networking environment.
Sometimes by some bad interaction between plugins that ends up impacting the
channel.
Your best approach is to figure out where these disconnects originate and
resolve the issue.
I have seen a lot of bug-reports on this. For most, a workaround is
advised by disabling the Ping-Thread through setting:
You should be cautious about changing the ping settings or disabling it
entirely. It can cause some weird and unexpected behaviors. If you do change
the settings, I recommend you change one thing at a time and evaluate the
results. If it doesn't make any difference, restore it to its default setting.
And, is there also a slave setting for the timeoutvalue?
It depends on how you launch the agent. Remoting system properties are
described at
https://github.com/jenkinsci/remoting/blob/master/docs/configuration.md
(naming for all these settings does not look to be very consistent...)
Unfortunately, that's the case.
Jeff Thompson
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