[JENKINS-56883] Docker proxy is not set if it matches the host proxy

I found a bug that doesn't let me set the company proxy inside a docker container because it is defined on the host as well.

environment variable on the host:

https_proxy=mycompany.de:8080

 

pipeline {

    agent {

label 'master'

    }

    stages {

stage('Azure Docker Image Build') {

    steps {

withDockerContainer('microsoft/azure-cli') {

    withEnv(['HTTPS_PROXY=mycompany.de:8080']) {

sh 'env'

    }

}

    }

}

    }

}

I think the origin of this bug is this line: https://github.com/jenkinsci/docker-workflow-plugin/blob/648f335899c5229fb8a6e889739db9cfb15de890/src/main/java/org/jenkinsci/plugins/docker/workflow/WithContainerStep.java#L130

Where every enivronment variable that matches the host variables is removed.

Currently the workaround is to explicitly set the environment variable:

withDockerContainer(args: '-e HTTPS_PROXY=mycompany.de:8080', image: 'microsoft/azure-cli') {

    // some block

}

---
Originally reported by xaseron, imported from: Docker proxy is not set if it matches the host proxy

• status: Open
  
• priority: Major
  
• component(s): docker-workflow-plugin
  
• resolution: Unresolved
  
• votes: 1
  
• watchers: 1
  
• imported: 2025-12-07
  

Raw content of original issue

I found a bug that doesn't let me set the company proxy inside a docker container because it is defined on the host as well.


environment variable on the host:



https_proxy=mycompany.de:8080





 



pipeline {

    agent {

        label 'master'

    }

    stages {

        stage('Azure Docker Image Build') {

            steps {

                withDockerContainer('microsoft/azure-cli') {

                    withEnv(['HTTPS_PROXY=mycompany.de:8080']) {

                        sh 'env'

                    }

                }

            }

        }

    }

}





I think the origin of this bug is this line: https://github.com/jenkinsci/docker-workflow-plugin/blob/648f335899c5229fb8a6e889739db9cfb15de890/src/main/java/org/jenkinsci/plugins/docker/workflow/WithContainerStep.java#L130


Where every enivronment variable that matches the host variables is removed.


Currently the workaround is to explicitly set the environment variable:



withDockerContainer(args: '-e HTTPS_PROXY=mycompany.de:8080', image: 'microsoft/azure-cli') {

    // some block

}