Jenkins: skip if node is offline

Question

I have a task that executes on n machines based on a label. If for some reason, some of these machines are offline, I do not want Jenkins to put them in a queue, and wait until they are online. I would like Jenkins to execute the job on the remaining machines and complete the job. Any suggestions?

Edit 1: I realized that the job is tied to all the machines:

I was forced to do this because I needed this job to run simultaneously on all the machines. So, my question remains the same. If some of these machines are offline, I would like to skip the job on them, rather than wait/queue.

Edit 2: Jenkins CLI has a clear queue command. It seems promising for the time.

Answer 1

A fine solution can be achieved using GroovyAxis Plugin and the following script, that will return Axis list of online slaves only:

def axis = []
for (slave in hudson.model.Hudson.instance.slaves) {
 if (slave.getComputer().isOnline().toString() == "true") {
   axis += slave.name
 }
}
return axis

UPDATE: Since Jenkins 2.0 the node API has been changed, so use Node.toComputer() instead: http://javadoc.jenkins-ci.org/hudson/model/Node.html#toComputer%28%29

def axis = []
for (slave in jenkins.model.Jenkins.instance.getNodes()) {
 if (slave.toComputer().isOnline()) {
    axis += slave.getDisplayName()
 }
}
return axis