How to use post steps with Jenkins pipeline on multiple agents?

Question

When using the Jenkins pipeline where each stage runs on a different agent, it is good practice to use agent none at the beginning:

pipeline {
          


        

Answer 1

wrap the step that does the mailing in a node step:

post {
  always {
    node('awesome_node_label') {
      step([$class: 'Mailer', notifyEveryUnstableBuild: true, recipients: "test@test.com", sendToIndividuals: true])
    }
  }
}

Answer 2

I know this is old but I stumbled on this looking for something related. If you want to run the post step on any node, you can use

    post {
      always {
        node(null) {
          step([$class: 'Mailer', notifyEveryUnstableBuild: true, recipients: "test@test.com", sendToIndividuals: true])
        }
      }
    }

https://jenkins.io/doc/pipeline/steps/workflow-durable-task-step/#node-allocate-node Says that the label may be left blank. Many times in a declarative pipeline if something is left blank this results in an error. To work around this, setting it to null will often work.