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  1. Jenkins
  2. JENKINS-52724

Building an image with a custom registry overwrites environment variables

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    • Docker Commons Plugin 1.15

      We are using a Jenkinsfile-based pipeline to build an image using a private docker registry. The corporate proxy has been configured in the docker config, which is then passed via environment variables (HTTP(S)_PROXY). It seems that specifying a private docker registry overwrites the proxy settings, supplied by the docker daemon, resulting in the following error message:

      fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/main/x86_64/APKINDEX.tar.gz
[91mERROR: http://dl-cdn.alpinelinux.org/alpine/v3.8/main: DNS lookup error
WARNING: Ignoring APKINDEX.adfa7ceb.tar.gz: No such file or directory

      The issue can be reproduced with the following simple Jenkinsfile (in order to test it you would need access to a private docker registry and be behind a corporate proxy):
       

      node('docker') {
    stage("first") {
        sh 'echo FROM alpine > Dockerfile'
        sh 'echo RUN printenv >> Dockerfile'
        sh 'echo RUN apk add bash >> Dockerfile'
        
        //docker.withRegistry('https://registry.hub.docker.com') {
        docker.withRegistry('https://artifactory-url-here', 'credentials-id-here') {
            docker.build('test')
        }
    }
}

      This is the output when using docker hub:

      HOSTNAME=f85fb49b6a51
SHLVL=1
HOME=/root
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/

      And this is the output when using a private docker registry:

      HOSTNAME=b2c35a88bf3e
SHLVL=1
HOME=/root
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
PWD=/
NO_PROXY=xxxxx
HTTPS_PROXY=xxxxxx
HTTP_PROXY=xxxxxx

            Unassigned Unassigned
            kvalev Krassimir Valev
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              Created:
              Updated:
              Resolved: