Multiple Jenkins Nodes in Pipeline - jenkins

Question

Currently we have a jenkins pipeline with 4 stages. Setup, Build, Deploy, Teardown. Deploy and Teardown prompt for manual user input. Because of this, we don`t want manual user input to take up an executor. So, we want to use agent none. However, when resuming, there is no guarentee we get the same jenkins workspace. Stash/unstash says it uses alot of resources, so if you have large files not to use it. Is there a way to get the exact slave, and when resuming, run back on that same slave?
I have something like this now I also tried agent gcp at top level, and putting agent none in manual input
pipeline {
agent none
environment {
userInput = false
}
stages {
stage('Setup') {
agent { node { label 'gcp' } }
steps {
deleteDir()
dir('pipelines') {
checkout scm
}
dir('deployment_pipelines'){
git branch: __deployment_scripts_code_branch, credentialsId: 'jenkins', url: __deployment_scripts_code_repo
}
dir('gcp_template_core'){
git branch: __gcp_template_code_branch, credentialsId: 'jenkins', url: __gcp_template_code_repo
}
dir('control_repo'){
git branch: _control_repo_branch, credentialsId: 'jenkins', url: _control_repo
}
// Copy core templates to the project
sh('bash deployment_pipelines/deployment/setup.sh gcp_template_core/gcp_foundation/ control_repo')
}
}
stage('Build') {
agent { node { label 'gcp' } }
steps {
sh('printenv') //TODO: Remove. Debug only
sh('python deployment_pipelines/deployment/build.py control_repo --env ${_env_type_long}')
}
}
stage('Deploy') {
agent { node { label 'gcp' } }
steps {
sh('python deployment_pipelines/deployment/deploy.py control_repo --env ${_env_type_short}')
}
}
stage('Release') {
steps {
agent none
script {
sh('python deployment_pipelines/deployment/set_manual_approvers.py deployment_pipelines/config/production-release-approvers.yaml -o approver.txt')
def approvers = readFile('approver.txt')
try {
userInput = input(
message: 'Do you want to proceed with Release?',
submitter: approvers)
} catch(err) { // input false
//def user = err.getCauses()[0].getUser() //need script approval for getUser()
userInput = false
// echo "Aborted by [${user}]"
}
agent { node { label 'gcp' } }
if(userInput)
{
sh("echo 'Do Release'")
}
}
}
}
stage('Teardown'){
agent { node { label 'gcp' } }
steps {
script {
def approvers = readFile('approver.txt')
try {
userInput = input(
message: 'Do you want to proceed with Teardown?',
submitter: approvers)
} catch(err) { // input false
//def user = err.getCauses()[0].getUser() //need script approval for getUser()
userInput = false
// echo "Aborted by [${user}]"
}
if(userInput)
{
sh("echo 'Do Teardown'")
}
}
}
}
}
post {
always {
echo 'DO TEARDOWN REGARDLESS'
}
}
}

Answer 1

agent none should be above step block in stage('Release'). You can refer https://jenkins.io/doc/book/pipeline/syntax/#agent for syntax and flow