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jenkins_node_manager

Jenkins Node Manager is a set of scripts that allow you to connect a node to a jenkins master and to controll scalling. It can be used to connect a jenkins node to a specified master using JNLP for any unclaimed nodes listed on the master. This works with jenkins systems that use authentication. This is valuable when in a scenario where you want to be able to scale up or down nodes on a regular basis.

Setup

  1. On the master, create your nodes and set them up for Java web start connections. I recommend you just make a bunch of copies of these so they can be used by nodes as you need them, unless you use the jenkins-cli.jar to create new nodes as needed.

  2. From your node, you will need to set 4 environment variables

     JENKINS_HOSTNAME
 JENKINS_PORT
 JENKINS_USERNAME
 JENKINS_API_KEY

  3. Run the connection script from the node.

     ruby connect_to_master.rb

You can also specify a node name to try to connect to...

    ruby connect_to_master.rb node12

Recommended use: Have a startup script on your jenkins node that will

  1. execute setting environment variables
  2. cloneing this repo
  3. Createing new nodes on jenkins (this can be done with jenkins-cli.jar)
  4. and executing this script.

Nodes to be ignored for scaling purposes

Any node with a name containing DoNotMerge (case-insensitive) will be ignored by this script as it figures out how to scale