Run job on all existing Jenkins workers - jenkins

Question

I have a Job in a pipeline that cleans up docker images. It runs the job on each worker individually. This is frustrating because when I add jenkins-cpu-worker3, I'll have to update this job.
I'd like to run this job in such a way that it runs on all workers without having to update it each time a new worker is present. I also want the job to be able to run regardless of what I name each worker. It needs to run on all workers no matter what.
Is there a way to query jenkins from within the pipeline to get me a list or array of all the workers that exist. I was leafing through documentation and posts online and I have not found a solution that works. If possible I'd like to do this without any additional Jenkins Plugins.
pipeline {
agent any
stages {
stage('Cleanup jenkins-cpu-worker1') {
agent {
node {
label 'jenkins-cpu-worker1'
}
}
steps {
sh "docker container prune -f"
sh "docker image prune -f"
sh '''docker images | awk '{print $1 ":" $2}' | xargs docker image rm || true'''
sh "docker network prune -f"
sh "docker volume prune -f"
}
}
stage('Cleanup jenkins-cpu-worker2') {
agent {
node {
label 'jenkins-cpu-worker2'
}
}
steps {
sh "docker container prune -f"
sh "docker image prune -f"
sh '''docker images | awk '{print $1 ":" $2}' | xargs docker image rm || true'''
sh "docker network prune -f"
sh "docker volume prune -f"
}
}

Answer 1

Here is an improved version of your Pipeline. This will dynamically get all the active agents, and run your cleanup task in parallel.
pipeline {
agent any
stages {
stage('CleanupWorkers') {
steps {
script {
echo "Something"
parallel parallelJobs()
}
}
}
}
}
def parallelJobs() {
jobs = [:]
for (def nodeName in getAllNodes()) {
jobs[nodeName] = getStage(nodeName)
}
return jobs
}
def getStage(def nodeName){
return {
stage("Cleaning $nodeName") {
node(nodeName){
sh'''
echo "Srating cleaning"
docker container prune -f
docker image prune -f
docker images | awk '{print $1 ":" $2}' | xargs docker image rm || true
docker network prune -f
docker volume prune -f
'''
}
}
}
}
def getAllNodes() {
def nodeNames = []
def jenkinsNodes = Jenkins.instance.getNodes().each { node ->
// Ignore offline agents
if (!node.getComputer().isOffline()){
nodeNames.add(node.getNodeName())
}
}
return nodeNames
}