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slave.jar is meant to be launched by Jenkins, typically through a remote shell like ssh/rsh.
Jenkins master then communicates with this agent through stdin and stdout.

slave.jar is not meant to initiate a connection to the master on its own, so if you are trying to run
it from cron or as a service, you are misunderstanding how this works.

% java -jar slave.jar
WARNING: Are you running slave agent from an interactive console?
If so, you are probably using it incorrectly.
See http://wiki.jenkins-ci.org/display/JENKINS/Launching+slave.jar+from+from+console

See Distributed builds for more details.

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7 Comments

  1. Himanshu Paliwal

    Then how to connect slave to master?

    Slave shows offline. And I have only a jar file : slave.jar

    slave-agent.jnlp is missing.

    1. Denys Digtiar

      Distributed builds has a list of possible ways.

  2. Himanshu Paliwal

    Thanks Denys for reference.

    I am able to install JNLP file as "Windows Service"

    But after adding it as service I am getting below windows pop up after every 1 minute and all one can do is say - "Ask me later" or close window manually. But it appears again after a minute.

     

    How to get rid of this?

     

    1. Denys Digtiar

      Wiki comments are not the right place to troubleshoot issue. Please ask on the user's mailing list. Thank you! https://jenkins.io/mailing-lists/

  3. Himanshu Paliwal

  4. Dusan Maksic

    When node is added and as launch method Launch agent via Java Web Start is used, node details page provides following info:

    Connect agent to Jenkins one of these ways

    • Launch agent from browser
    • Run from agent command line:  java -jar agent.jar...


    Again,


    slave.jar is not meant to initiate a connection to the master on its own, so if you are trying to run
    it from cron or as a service, you are misunderstanding how this works.


    Could someone please explain how these two things go together?

    1. Denys Digtiar

      Yes, it sounds like there is a bit of contradiction between the two. The Launch agent via Java Web Start page is correct. If you pass the certain arguments the default mode that uses stdin/stdout is replaced by a JNLP mode which initiates the connection.