CODEWITHSUNDEEP
jenkinsagent
Rakib
Rakib

Reputation: 13085

Jenkins agent keeps disconnecting / reconnecting repeatedly

I have a jenkins master server. I just created a new jenkins agent and launching it via Java Web Start in a ubuntu host. The agent connects successfully, but after some time it says "Terminated", then again after some time it says "Connected". And it keeps repeating like this throughout.

I am not even trying to run a build/job yet

Interestingly enough, this ubuntu agent and this jnlp and this java web start has been working fine for the last several weeks - even until a few hours ago. Now suddenly it's starting to disconnected and reconnect repeatedly like this.

JNLP agent connected from /116.68.205.58
<===[JENKINS REMOTING CAPACITY]===>Slave.jar version: 3.2
This is a Unix agent
ERROR: Connection terminated
java.io.IOException: Unexpected termination of the channel
    at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:73)
Caused by: java.io.EOFException
    at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2353)
    at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2822)
    at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:804)
    at java.io.ObjectInputStream.<init>(ObjectInputStream.java:301)
    at hudson.remoting.ObjectInputStreamEx.<init>(ObjectInputStreamEx.java:48)
    at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34)
    at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:59)
ERROR: Failed to install restarter
hudson.remoting.RequestAbortedException: java.io.IOException: Unexpected termination of the channel
    at hudson.remoting.Request.abort(Request.java:307)
    at hudson.remoting.Channel.terminate(Channel.java:888)
    at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:92)
    at ......remote call to Channel to /116.68.205.58(Native Method)
    at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1537)
    at hudson.remoting.Request.call(Request.java:172)
    at hudson.remoting.Channel.call(Channel.java:821)
    at jenkins.slaves.restarter.JnlpSlaveRestarterInstaller.install(JnlpSlaveRestarterInstaller.java:52)
    at jenkins.slaves.restarter.JnlpSlaveRestarterInstaller.access$000(JnlpSlaveRestarterInstaller.java:33)
    at jenkins.slaves.restarter.JnlpSlaveRestarterInstaller$1.call(JnlpSlaveRestarterInstaller.java:39)
    at jenkins.slaves.restarter.JnlpSlaveRestarterInstaller$1.call(JnlpSlaveRestarterInstaller.java:36)
    at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Unexpected termination of the channel
    at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:73)
Caused by: java.io.EOFException
    at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2353)
    at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2822)
    at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:804)
    at java.io.ObjectInputStream.<init>(ObjectInputStream.java:301)
    at hudson.remoting.ObjectInputStreamEx.<init>(ObjectInputStreamEx.java:48)
    at hudson.remoting.AbstractSynchronousByteArrayCommandTransport.read(AbstractSynchronousByteArrayCommandTransport.java:34)
    at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:59)
JNLP agent connected from /116.68.205.58
<===[JENKINS REMOTING CAPACITY]===>Slave.jar version: 3.2
This is a Unix agent

Upvotes: 3

Views: 11060

Answers (1)

Miguel Rentes
Miguel Rentes

Reputation: 1003

Check the jenkins slave log for possible problems. Also, how is the Availability setting under the Jenkins node configuration page?

Jenkins >> Manage Jenkins >> Manage Nodes >> your node >> Configure

I recently had a Windows slave with the same symptom and change the Availability from

"Take this agent online when in demand, and offline when idle"

to

"Keep this agent online as much as possible"

and it solved my problem, but you might have a different problem from the one I had. So I suggest first viewing the slave logs. If you can, post the log snippet here for further analysis.

Upvotes: 2

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