[JIRA] (JENKINS-58937) exception while connecting to remote host (ssh)

olivier@vernin.me (JIRA)

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Aug 14, 2019, 12:00:03 PM8/14/19

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Olivier Vernin created an issue

Jenkins /

JENKINS-58937

exception while connecting to remote host (ssh)

Issue Type:	Task
Assignee:	Azure DevOps
Components:	azure-vm-agents-plugin
Created:	2019-08-14 15:59
Environment:	Jenkins 2.176.2
Priority:	Critical
Reporter:	Olivier Vernin

AzureVMAgentSSHLauncher: getRemoteSession: Got exception while connecting to remote host ubuntu-jenkinsinfraf4fce1.eastus2.cloudapp.azure.com:22
java.net.UnknownHostException: ubuntu-jenkinsinfraf4fce1.eastus2.cloudapp.azure.com
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:220)
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403)
at java.base/java.net.Socket.connect(Socket.java:591)
at java.base/java.net.Socket.connect(Socket.java:540)
at java.base/java.net.Socket.<init>(Socket.java:436)
at java.base/java.net.Socket.<init>(Socket.java:213)
at com.jcraft.jsch.Util$1.run(Util.java:362)
Caused: com.jcraft.jsch.JSchException
at com.jcraft.jsch.Util.createSocket(Util.java:394)
at com.jcraft.jsch.Session.connect(Session.java:215)
at com.jcraft.jsch.Session.connect(Session.java:183)
at com.microsoft.azure.vmagent.remote.AzureVMAgentSSHLauncher.getRemoteSession(AzureVMAgentSSHLauncher.java:307)
at com.microsoft.azure.vmagent.remote.AzureVMAgentSSHLauncher.connectToSsh(AzureVMAgentSSHLauncher.java:453)
at com.microsoft.azure.vmagent.remote.AzureVMAgentSSHLauncher.launch(AzureVMAgentSSHLauncher.java:115)
at hudson.slaves.SlaveComputer$1.call(SlaveComputer.java:294)
at jenkins.util.ContextResettingExecutorService$2.call(ContextResettingExecutorService.java:46)
at jenkins.security.ImpersonatingExecutorService$2.call(ImpersonatingExecutorService.java:71)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)

Every jobs are now failing because of ssh connection issues, we didn't change anything in our configuration, and it doesn't seem to have any network issues

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jieshe@microsoft.com (JIRA)

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Aug 14, 2019, 9:34:02 PM8/14/19

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Jie Shen assigned an issue to Jie Shen

Jenkins /

JENKINS-58937

exception while connecting to remote host (ssh)

Change By:	Jie Shen
Assignee:	Azure DevOps Jie Shen

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jieshe@microsoft.com (JIRA)

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Aug 14, 2019, 9:44:02 PM8/14/19

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Jie Shen commented on

JENKINS-58937

Re: exception while connecting to remote host (ssh)

Olivier Vernin On the Jenkins server, could you please try to lookup the "ubuntu-jenkinsinfraf4fce1.eastus2.cloudapp.azure.com" domain? It seems to be related with DNS.

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olivier@vernin.me (JIRA)

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Aug 16, 2019, 3:30:04 AM8/16/19

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Olivier Vernin commented on

JENKINS-58937

Re: exception while connecting to remote host (ssh)

Jie Shen The issue seems more global than a network issue, as you can see on this public jenkins instance 'ci.jenkins.io' no vm are created anymore with the azure-vm-agent plugin.
Would it be possible to be caused by an outdated api on azure side?

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jieshe@microsoft.com (JIRA)

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Aug 16, 2019, 3:52:02 AM8/16/19

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Jie Shen commented on

JENKINS-58937

Re: exception while connecting to remote host (ssh)

Olivier Vernin it is possible to be caused by some outdated arm template. I want to confirm if the agents have been created successfully and in healthy state. If not, could you please provide any provisioning log to indicate which prevents to provision the new agents.