jenkins pipeline parallel post task to clear up docker containers - docker

Question

If I'm running parallel tasks across multiple agents, instead of having a post action on each job, how can I have it on the parallel stage itself? The issue with having them all on each stage is that if the stage is sharing an agent with another stage, docker system prune -f -a can interfere with the other stage.
I am trying to ensure the cache is clear on the build agent, so it's always pulling the latest fresh from Artifactory. Plus cleaning up after the build to make sure nothing is left dangling.
For example
stage("Docker stuff"){
parallel{
stage(foo){
agent{label "docker"}
steps{...}
}
stage(bar){
agent{label "docker"}
steps{...}
}
stage(foobar){
agent{label "docker"}
steps{...}
}
}
post{
always{
sh "docker image prune -f"
sh "docker volume prune -f"
sh "docker container prune -f"
sh "docker system prune -a -f"
sh "docker builder prune -a -f"
}
}
}
The issue with the above is that the post actions run only on the agent selected to manage the parallel stages, not the agents actually doing the running.
The issue with the below is the post actions can interfere with other stages.
stage("Docker stuff"){
parallel{
stage(foo){
agent{label "docker"}
steps{
script{
def dockerImage = _dockerImage("docker-local/foo-image")
docker.withRegistry( "https://artifactory-dev.company.com/", "svc_bar") {
dockerImage.push()
dockerImage.push("latest")
}
}
}
post{
always{
echo "========always========"
sh "docker image prune -f"
sh "docker volume prune -f"
sh "docker container prune -f"
sh "docker system prune -a -f"
sh "docker builder prune -a -f"
}
}
}
stage(bar){
agent{label "docker"}
steps{...}
post{...}
}
stage(foobar){
agent{label "docker"}
steps{...}
post{...}
}
}
}

Answer 1

stage(''){
steps {
script {
timeout(time: 24, unit: 'HOURS') {
try {
parallel(
a: {
},
b: {
},
c: {
}
)
}catch (any){
//currentBuild.result = 'FAILURE'
}finally{
}
}
}
}
}
post {
always {
}
}
It seems to me that you cannot perform certain actions in docker at the same time, in different nodes I do not see a problem