Concourse Can't Connect to Docker Repository

问题

I'm new to concourse and trying to set it up in my environment. I'm running Ubuntu 18.04 on Virtualbox 6.1.4 r136177 on Windows machine. I managed to get the node running and concourse worker set up, and I was able to access my concourse dashboard successfully. The problem occurred when I was trying to run a simple hello world pipeline as outlined on this page : https://concourse-ci.org/hello-world-example.html

The error says :

[31mERRO [0m[0004] check failed: get remote image: Get https://index.docker.io/v2/: dial tcp: lookup index.docker.io on [::1]:53: read udp [::1]:55989->[::1]:53: read: connection refused

Googling for similar error indicates that virtualbox might not be able to connect to docker repository. So I proceed with installing docker to my system and run the following command :

sudo docker run hello-world

But this this time docker successfully pulled the image. So I think it is not an issue with my virtualbox. Have anyone experienced the same issue and found a solution?

UPDATES

The following question inspire me to build my own registry : How to use a local docker image as resource in concourse-docker

I have configured my local docker registry, and have verified that it does work by pulling my image from my own registry. So I configured a simple concourse pipeline to use my registry by modifying the hello world example :

---
jobs:
  - name: job
    public: true
    plan:
      - task: simple-task
        config:
          platform: linux
          image_resource:
            type: docker-image
            source:
              repository: 127.0.0.1:5000/busybox
              tag: latest
              insecure_registries: [ "127.0.0.1:5000" ]
          run:
            path: echo
            args: ["Hello, world!"]

But then I run into the following error :

resource script '/opt/resource/check []' failed: exit status 1

stderr:
failed to ping registry: 2 error(s) occurred:

* ping https: Get https://127.0.0.1:5000/v2: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers
* ping http: Get http://127.0.0.1:5000/v2: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers

回答1:

That 127.0.0.1 is likely referring to the IP of the check container, not the machine where Concourse is running as a worker (unless you have houdini as the container strategy). Try getting the actual IP of the machine running docker and try that.

来源：https://stackoverflow.com/questions/60860860/concourse-cant-connect-to-docker-repository

标签

Docker

continuous-integration

concourse