plugin to validate agents before allowing jobs to run

[Antonio Beyah]

I have recently started using the Jenkins Swarm plugin which grants us the ability to allow dynamic agents to join the cluster, I am thinking about writing a plugin that would perform a set of actions before the agent is allowed to take jobs, irrespective of the 'mode' or 'label' assignments.

When a new agent joins, I would like to be able to run a set of tests, or jobs that would signify whether or not the agent is capable of taking on real jobs.  Things such as: checkout code from scm, run a gradle build, etc

My thinking for implementation:

- When an agent joins the cluster, don't allow it to take any jobs until it is vetted

- To vet the agent, a set of jobs would all be required to pass (run and return a success)

More implementation details:

1) When an agent joins, immediately set its mode to 'exclusive' and change all labels to <label>_candidate

2) Do a search for any job with the <label>_candidate restriction and run those jobs

3) If those jobs are all successful, remove the <label>_candidate label and set the mode back to its original setting

My questions:

1) Is there a better way to do this?

2) What extension points should I look at to do this?  So far I have started looking at hudson.slaves.ComputerListener but am unsure if I can hook in early enough to prevent any jobs from running on the newly added agent before changing it

3) Does a plugin already exist that does this or have similar behavior?

Any guidance would be appreciated.

Thanks!

Antonio

[Robert Sandell]

You could use a QueueTaskDispatcher [1] to block any builds (except the vetting jobs) from running on the node until it has cleared the vetting process. And using the NodeLabel parameter plugin [2] you could schedule a job to run on a specific Node (the one that just connected).

You could also use an OptionalJobPropery [3] to mark specific jobs as being specially for this purpose or maybe pick all jobs in a special Folder [4].

[1] http://javadoc.jenkins-ci.org/hudson/model/queue/QueueTaskDispatcher.html
[2] https://wiki.jenkins-ci.org/display/JENKINS/NodeLabel+Parameter+Plugin
[3] http://javadoc.jenkins-ci.org/jenkins/model/OptionalJobProperty.html
[4] https://wiki.jenkins-ci.org/display/JENKINS/CloudBees+Folders+Plugin

/B

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Robert Sandell

Software Engineer

CloudBees Inc.

[Antonio Beyah]

Thank you, I will try this out and reach out if I have any questions.

Thanks,

Antonio