gitlab-ci docker-in-docker access to insecure registry

Question

When configuring a gitlab-ci for building docker images and pushing them to my gitlab's insecure registry, I encountered several errors. My gitlab-ci.yaml is laid out below:

stages:
  - build
  - deploy

variables:
  GIT_SUBMODULE_STRATEGY: recursive
  CONTAINER_IMAGE: XXX:$CI_COMMIT_REF_NAME

# The insecure-registry flag 
services:
  - docker:dind

build_container:
  image: docker:latest
  stage: build
  before_script:
    - echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" "$CI_REGISTRY" --password-stdin

  script:
    - docker build --pull -t $CONTAINER_IMAGE .
    - docker push $CONTAINER_IMAGE

The first error was:

  $ docker login -u gitlab-ci-token -p $CI_JOB_TOKEN myregistry.gitlab.com
  WARNING! Using --password via the CLI is insecure. Use --password-stdin.
  Warning: failed to get default registry endpoint from daemon (Cannot connect 
  to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon 
  running?). Using system default: https://index.docker.io/v1/
  Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the 
  docker daemon running?

This was resolved by updating the login command to

echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" myregistry.gitlab.com --password-stdin

Unfortunately after updating, I encountered another error:

$ echo "$CI_REGISTRY_PASSWORD" | docker login -u "$CI_REGISTRY_USER" myregistry.gitlab.com --password-stdin
Error response from daemon: Get https://myregistry.gitlab.com/v2/: dial tcp XX.XX.XXX.XXX:443: getsockopt: connection refused

How Can I resolve this?

Answer 1

Like any other docker installation, it is necessary to instruct the docker daemon to allow connections to insecure registries. In order to do this in the context of the docker-in-docker service, one must pass this configuration to the service. This can be done by updating your gitlab-ci.yaml to specify the service as:

services:
  - name: docker:dind
    command: ["--insecure-registry=myregistry.gitlab.com"]