Jenkins using docker agent with environment declarative pipeline

Question

I would like to install maven and npm via docker agent using Jenkins declarative pipeline. But When I would like to use below script Jenkins throws an error as below. It might be using agent none but how can I use node with docker agent via declarative pipeline jenkins.

ERROR: Attempted to execute a step that requires a node context while ‘agent none’ was specified. Be sure to specify your own ‘node { ... }’ blocks when using ‘agent none’.

I try to set agent any but this time I received an error "Still waiting to schedule task Waiting for next available executor"

 pipeline {
    agent none
    // environment{

            proxy = https://
    //      stable_revision = sh(script: 'curl -H "Authorization: Basic $base64encoded" 
    // }

    stages {
        stage('Build') {
            agent {
                docker { image 'maven:3-alpine'}
            }
            steps {
                sh 'mvn --version'       
                echo "$apigeeUsername"
                echo "Stable Revision: ${env.stable_revision}"   
            }
        }
        stage('Test') {
            agent { docker { image 'maven:3-alpine' image 'node:8.12.0' } }
            environment {
                 HOME = '.'
                 }
            steps {
                script{
                    try{
                        sh 'npm install'
                        sh 'node --version'
                        //sh 'npm test/unit/*.js'                
                    }catch(e){
                        throw e
                    }        
                }
            }
        }
        // stage('Policy-Code Analysis') {
        //     steps{
        //         sh "npm install -g apigeelint"
        //         sh "apigelint -s wiservice_api_v1/apiproxy/ -f codeframe.js"
        //     }
        // }
         stage('Promotion'){
            steps{
                timeout(time: 2, unit: 'DAYS') {
                input 'Do you want to Approve?'
                }
            }
        }
        stage('Deployment'){
            steps{
                 sh "mvn -f wiservice_api_v1/pom.xml install -Ptest -Dusername=${apigeeUsername} -Dpassword=${apigeePassword} -Dapigee.config.options=update"
                 //sh "mvn apigee-enterprise:install -Ptest -Dusername=${apigeeUsername} -Dpassword=${apigeePassword} " 
            }
        }
    }
}

Michael Kemmerzell Michael Kemmerzell · Accepted Answer · 2019-12-13T11:11:19

Basically your error message tells you everything you need to know:

ERROR: Attempted to execute a step that requires a node context while ‘agent none’ was specified. Be sure to specify your own ‘node { ... }’ blocks when using ‘agent none’.

so what is the issue here? You use agent none for your pipeline which means you do not specify a specific agent for all stages. An agent executes a specific stage. If a stage has no agent it can't be executed and this is your issue here.

The following 2 stage have no agent which means no docker-container / server or whatever where it can be executed.

     stage('Promotion'){
        steps{
            timeout(time: 2, unit: 'DAYS') {
            input 'Do you want to Approve?'
            }
        }
    }
    stage('Deployment'){
        steps{
             sh "mvn -f wiservice_api_v1/pom.xml install -Ptest -Dusername=${apigeeUsername} -Dpassword=${apigeePassword} -Dapigee.config.options=update"
             //sh "mvn apigee-enterprise:install -Ptest -Dusername=${apigeeUsername} -Dpassword=${apigeePassword} " 
        }
    }

so you have to add agent { ... } to both stage seperately or use a global agent like following and remove the agent from your stages:

 pipeline {
    agent {
        docker { image 'maven:3-alpine'}
    } ...

For further information see guide to set up master and agent machines or distributed jenkins builds or the official documentation.

Jenkins using docker agent with environment declarative pipeline

2 Answers