[FIXED] HTTP proxy in Jenkinsfile causes docker pull to fail with "Proxy Authentication Required"

Issue

Here is my Jenkinsfile for a sample python app, Build a Python app with PyInstaller

pipeline {
    agent none
    environment {
        HTTP_PROXY = "http://${CORPORATE_PROXY}:${PORT}"
        HTTPS_PROXY = "http://${CORPORATE_PROXY}:${PORT}"
        NO_PROXY = "${NO_PROXY}"
    }
    stages {
        stage('Build') {
            agent {
                docker {
                    image 'python:2-alpine'
                }
            }
            steps {
                sh 'python -m py_compile sources/add2vals.py sources/calc.py'
                stash(name: 'compiled-results', includes: 'sources/*.py*')
            }
        }
    }
}

This works off of VPN, I am trying to make it work behind proxy. I have tried to configure Jenkins proxy here too 'Manage Jenkins->Manage Plugins->Advanced->HTTP Proxy Config' and Validated the same to SUCCESS.

I get following error when I check Build logs

+ docker pull python:2-alpine

error during connect: Post "https://docker:2376/v1.24/images/create?fromImage=python&tag=2-alpine": Proxy Authentication Required

script returned exit code 1

I tried using docker args - no go, I tried to pull this image separately behind proxy - works.

I feel maybe it has to do something with sending credentials to build stage of jenkins pipeline. please advise on how do I add credentials/how do I address this error?

Solution

included proxy under manage credentials and did Jenkins restart, Double check proxy setup and validate external website to show "Success" message to fix the issue.

To restart Jenkins: http://localhost:8080/restart

Answered By - MAK