Details
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Bug
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Status: Resolved (View Workflow)
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Major
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Resolution: Fixed
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org.jenkins-ci.main:jenkins-war:2.170
org.jenkins-ci:crypto-util:1.1
org.jenkins-ci.modules:sshd:2.6
org.kohsuke:trilead-putty-extension:1.2
org.jenkins-ci.modules:ssh-cli-auth:1.5
org.jenkins-ci.plugins:ssh-slaves:1.29.4
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ssh-slaves-1.30.0
Description
If you do not set the host field in the Node configuration it is possible to save it, then when it tries to connect fails with an NPE
Agent connection log
ERROR: Unexpected error in launching a agent. This is probably a bug in Jenkins. java.lang.NullPointerException at com.trilead.ssh2.KnownHosts.hostnameMatches(KnownHosts.java:313) at com.trilead.ssh2.KnownHosts.getAllKnownHostEntries(KnownHosts.java:260) at com.trilead.ssh2.KnownHosts.recommendHostkeyAlgorithms(KnownHosts.java:504) at com.trilead.ssh2.KnownHosts.getPreferredServerHostkeyAlgorithmOrder(KnownHosts.java:282) at hudson.plugins.sshslaves.verifiers.KnownHostsFileKeyVerificationStrategy.getPreferredKeyAlgorithms(KnownHostsFileKeyVerificationStrategy.java:92) at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:837) at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:833) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) [04/04/19 15:40:41] Launch failed - cleaning up connection
Config.xml
<?xml version='1.1' encoding='UTF-8'?> <slave> <name>agentNullHost</name> <description>agent description</description> <remoteFS>/home/jenkins</remoteFS> <numExecutors>1</numExecutors> <mode>NORMAL</mode> <retentionStrategy class="hudson.slaves.RetentionStrategy$Always"/> <launcher class="hudson.plugins.sshslaves.SSHLauncher" plugin="ssh-slaves@1.29.4"> <port>22</port> <credentialsId>my-credentials</credentialsId> <launchTimeoutSeconds>210</launchTimeoutSeconds> <maxNumRetries>10</maxNumRetries> <retryWaitTime>15</retryWaitTime> <sshHostKeyVerificationStrategy class="hudson.plugins.sshslaves.verifiers.NonVerifyingKeyVerificationStrategy"/> <tcpNoDelay>true</tcpNoDelay> </launcher> <label>linux</label> <nodeProperties/> </slave>
Attachments
Issue Links
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Hao Maio
added a comment - ifernandezcalvo: Unfortunately the documentation doesnt say anything about the host:
https://jenkins.io/doc/book/managing/nodes/ 
Maybe you have another hint?
Hao Maio
added a comment - ifernandezcalvo : Unfortunately the documentation doesnt say anything about the host:
https://jenkins.io/doc/book/managing/nodes/
Maybe you have another hint? 
take a look to the documentation https://wiki.jenkins.io/display/JENKINS/Distributed+builds also https://jenkins.io/doc/pipeline/tour/getting-started/
Hao Maio
added a comment - ifernandezcalvo: could you please give me any hint, of where I can read more about, what || how to choose the host ip ?
Hao Maio
added a comment - ifernandezcalvo : could you please give me any hint, of where I can read more about, what || how to choose the host ip ?
Jira is not a support site see https://wiki.jenkins.io/display/JENKINS/How+to+report+an+issue
BTW, the host setting is a hostname or an IP address of a host you want to use as an agent to execute jobs in it, does not have too much complication or too much to understand.