Awesome

📖

A Jenkins plugin used on https://scala-ci.typesafe.com to start and stop EC2 instances on demand.

Differs from the ec2-plugin, which creates and deletes instances based on AMIs.

🚒

After updating all (other) Jenkins plugins (Jan 23, 2023), this plugin stopped working, the Jenkins node log showed "Socket not created by this factory".

A google search brought me to this StackOverflow, suggesting to try updating dependencies. After attempting to update individual dependencies first, I finally updated everything, which luckily worked.

🚧

To build the plugin

• Switch to Java 11
• Allow external HTTP repos in maven by creating a file ~/.m2/settings.xml with the following content:

  <settings xmlns="http://maven.apache.org/SETTINGS/1.2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.2.0 http://maven.apache.org/xsd/settings-1.2.0.xsd">
      <mirrors>
            <mirror>
                <id>maven-default-http-blocker</id>
                <mirrorOf>dummy</mirrorOf>
                <name>Dummy mirror to override default blocking mirror that blocks http</name>
                <url>http://0.0.0.0/</url>
          </mirror>
      </mirrors>
  </settings>
  

• Build the plugin by running mvn install -Dspotbugs.skip=true
• Upload the target/ec2-start-stop.hpi file to a GitHub release
• Copy the hpi file URL and use it in https://scala-ci.typesafe.com/manage/pluginManager/advanced to install ("deploy") the new version, restart Jenkins

🤨

• Not sure where credentials are picked up.
• Didn't figure out how to enable verbose logging for the AWS client library - that would be useful when things don't work.