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  1. Jenkins
  2. JENKINS-59976

Nested agent try to fetch the image from top defined agent registry instead of docker hub

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      Description

      When you run a nested agent (let's call it 2nd agent) in the pipeline definition, it is being pulled from the 1st agent's (defined on top of pipeline) registry when no registry is specified on the 2nd (which should mean the official docker hub).

      Steps to reproduce:

      1. Run your Jenkins master, and assure the place you're gonna run the pipeline has Docker installed.
      2. Create a pipeline like this:
      ```groovy
      pipeline {
          agent {
              docker 

      {              registryUrl 'https://mirror.gcr.io'             image 'library/docker'             args '-v /var/run/docker.sock:/var/run/docker.sock'         }

          }
          stages {
              stage('Docker on Docker') {
                  agent {
                      docker 

      {                      // Should fetch from docker hub, right? It tries to fetch from the https://mirror.gcr.io instead.                     image 'alpine'                 }

                  }
                  steps 

      {                  sh 'echo hi'             }

              }
          }
      }
      ```
      3. Run, and you'll get something like this:
      ```log
      [Pipeline] {
      [Pipeline] stage
      [Pipeline] { (Docker on Docker)
      [Pipeline] getContext
      [Pipeline] isUnix
      [Pipeline] sh
      + docker inspect -f . alpine

      Error: No such object: alpine
      15:45:40.417159 durable_task_monitor.go:63: exit status 1
      [Pipeline] isUnix
      [Pipeline] sh
      + docker inspect -f . mirror.gcr.io/alpine

      Error: No such object: mirror.gcr.io/alpine
      15:45:40.704922 durable_task_monitor.go:63: exit status 1
      [Pipeline] isUnix
      [Pipeline] sh
      + docker pull mirror.gcr.io/alpine
      Using default tag: latest
      Error response from daemon: manifest for mirror.gcr.io/alpine:latest not found: manifest unknown: Failed to fetch "latest" from request "/v2/alpine/manifests/latest".
      15:45:41.467742 durable_task_monitor.go:63: exit status 1
      ```

      As you can see it tries to pull from mirror.gcr.io instead of the docker hub.

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          felipecassiors Felipe Santos added a comment -

          This is a workaround which can be used for now:

          Specify the registry on the 2nd agent
          agent {
              docker 

          {          registryUrl 'https://docker.io'         image 'alpine'     }

          }

          Show
          felipecassiors Felipe Santos added a comment - This is a workaround which can be used for now: Specify the registry on the 2nd agent agent {     docker  {          registryUrl 'https://docker.io'         image 'alpine'     } }
          Hide
          felipecassiors Felipe Santos added a comment -

          Another workaround is to manually set the default Docker registry URL to https://docker.io under Manage Jenkins -> Configure System > Pipeline Model Definition, despite it says the blank works the same. See attached pic.

          Show
          felipecassiors Felipe Santos added a comment - Another workaround is to manually set the default Docker registry URL to https://docker.io  under Manage Jenkins -> Configure System > Pipeline Model Definition, despite it says the blank works the same. See attached pic.

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            Unassigned Unassigned
            Reporter:
            felipecassiors Felipe Santos
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              Updated: