Can't get image jenkins/jnlp-slave with JNLP to work

I’m unable to get jenkins to start docker container with JNLP.

Jenkins 2.132 Docker-Plugin 1.1.5-rc592.907a3144f989 (tried 1.1.4 as well) Docker Version: 1.12.6 API version: 1.24

I have docker plugin setup with mostly default settings. Labels: slave-docker Name: docker Docker Image docker.io/jenkins/jnlp-slave:latest Remote Root: /home/jenkins Connect with JNLP

I’ve pulled down jenkins/jnlp-slave image and set pull strategy to never pull. I’m using pipeline and I can see the docker container start (docker ps -a) but then its removed. Here’s the build console output:

[Pipeline] node
Running on docker-008s1dq46jht0 on Lewisville Docker in /home/jenkins/workspace/docker-test
[Pipeline] {
[Pipeline] sh
[docker-test] Running shell script
+ docker inspect -f . jenkins/jnlp-slave
/home/jenkins/workspace/docker-test@tmp/durable-bbbcdcb2/script.sh: 2: /home/jenkins/workspace/docker-test@tmp/durable-bbbcdcb2/script.sh: docker: not found
[Pipeline] sh
[docker-test] Running shell script
+ docker pull jenkins/jnlp-slave
/home/jenkins/workspace/docker-test@tmp/durable-5886619f/script.sh: 2: /home/jenkins/workspace/docker-test@tmp/durable-5886619f/script.sh: docker: not found
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
ERROR: script returned exit code 127
Finished: FAILURE

Here’s the Jenkins log:

Jul 17, 2018 12:55:32 AM INFO com.nirima.jenkins.plugins.docker.DockerCloud provision
Asked to provision 1 slave(s) for: slave-docker
Jul 17, 2018 12:55:32 AM INFO com.nirima.jenkins.plugins.docker.DockerCloud canAddProvisionedSlave
Provisioning 'docker.io/jenkins/jnlp-slave:latest' on 'Lewi Docker'; Total containers: 0 (of 100)
Jul 17, 2018 12:55:32 AM INFO com.nirima.jenkins.plugins.docker.DockerCloud provision
Will provision 'docker.io/jenkins/jnlp-slave:latest', for label: 'slave-docker', in cloud: 'Lewi Docker'
Jul 17, 2018 12:55:32 AM INFO hudson.slaves.NodeProvisioner$StandardStrategyImpl apply
Started provisioning Image of docker.io/jenkins/jnlp-slave:latest from Lewi Docker with 1 executors. Remaining excess workload: 0
Jul 17, 2018 12:55:32 AM INFO com.nirima.jenkins.plugins.docker.DockerTemplate doProvisionNode
Trying to run container for docker.io/jenkins/jnlp-slave:latest
Jul 17, 2018 12:55:32 AM INFO com.nirima.jenkins.plugins.docker.DockerTemplate doProvisionNode
Trying to run container for node docker-008s1dq46jht0 from image: docker.io/jenkins/jnlp-slave:latest
Jul 17, 2018 12:55:32 AM INFO com.nirima.jenkins.plugins.docker.DockerTemplate doProvisionNode
Started container ID 34f5009ed64e591fa6e6712359532e65e5c447678cab9101aecbb598645df15d for node docker-008s1dq46jht0 from image: docker.io/jenkins/jnlp-slave:latest
Jul 17, 2018 12:55:33 AM INFO hudson.TcpSlaveAgentListener$ConnectionHandler run
Accepted JNLP4-connect connection #8 from lelvdck0005/10.180.168.192:56976
Jul 17, 2018 12:55:36 AM INFO hudson.slaves.NodeProvisioner$2 run
Image of docker.io/jenkins/jnlp-slave:latest provisioning successfully completed. We have now 4 computer(s)
Jul 17, 2018 12:55:38 AM INFO io.jenkins.docker.DockerTransientNode$1 println
Disconnected computer for slave 'docker-008s1dq46jht0'.
Jul 17, 2018 12:55:38 AM WARNING jenkins.slaves.DefaultJnlpSlaveReceiver channelClosed
Computer.threadPoolForRemoting [#166] for docker-008s1dq46jht0 terminated
java.nio.channels.ClosedChannelException
	at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onReadClosed(ChannelApplicationLayer.java:209)
	at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecvClosed(ApplicationLayer.java:222)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:832)
	at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:287)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:181)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.switchToNoSecure(SSLEngineFilterLayer.java:283)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processWrite(SSLEngineFilterLayer.java:503)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.processQueuedWrites(SSLEngineFilterLayer.java:248)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doSend(SSLEngineFilterLayer.java:200)
	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.doCloseSend(SSLEngineFilterLayer.java:213)
	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.doCloseSend(ProtocolStack.java:800)
	at org.jenkinsci.remoting.protocol.ApplicationLayer.doCloseWrite(ApplicationLayer.java:173)
	at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer$ByteBufferCommandTransport.closeWrite(ChannelApplicationLayer.java:314)
	at hudson.remoting.Channel.close(Channel.java:1450)
	at hudson.remoting.Channel.close(Channel.java:1403)
	at hudson.slaves.SlaveComputer.closeChannel(SlaveComputer.java:819)
	at hudson.slaves.SlaveComputer.access$800(SlaveComputer.java:105)
	at hudson.slaves.SlaveComputer$3.run(SlaveComputer.java:737)
	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	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)

Jul 17, 2018 12:55:38 AM INFO io.jenkins.docker.DockerTransientNode$1 println
Removed Node for slave 'docker-008s1dq46jht0'.
Jul 17, 2018 12:55:38 AM INFO org.jenkinsci.plugins.workflow.job.WorkflowRun finish
docker-test #2 completed: FAILURE
Jul 17, 2018 12:55:38 AM INFO io.jenkins.docker.DockerTransientNode$1 println
Stopped container '34f5009ed64e591fa6e6712359532e65e5c447678cab9101aecbb598645df15d' for slave 'docker-008s1dq46jht0'.
Jul 17, 2018 12:55:38 AM INFO io.jenkins.docker.DockerTransientNode$1 println
Removed container '34f5009ed64e591fa6e6712359532e65e5c447678cab9101aecbb598645df15d' for slave 'docker-008s1dq46jht0'.

What am I missing here that this isn’t working?

[bhoppeadoy]

@pjdarton OK, so using this:

    agent {
         label 'slave-docker'
    }

instead of this

    agent {
        docker {
            label 'slave-docker'
            image 'jnlp-slave'
        }
    }

Is what got it working. So difficult to find the correct pipeline syntax to use.

[pjdarton]

FYI agent { label '... is general (not docker-specific) Jenkins pipeline syntax. This asks Jenkins for any slave that satisfies the label expression which, if you’ve configured this docker plugin with a template that satisfies that label expression, will cause this docker plugin to spin up a container.

The previous syntax you used was for “the other plugin” which, as you’ve just discovered, has its own usage requirements. Feel free to raise an issue against that plugin (on their github area!) if you think you can suggest a better way it should work 😉

Glad you got it sorted in the end tho’