Why I can't pull a image to dependency proxy from GitLab?

Question

I've tried pull a image to dependency proxy from GitLab, I've read the documentation https://docs.gitlab.com/14.10/ee/user/packages/dependency_proxy/

# .gitlab-ci.yml
image: docker:19.03.12

variables:
  DOCKER_HOST: tcp://docker:2375
  DOCKER_TLS_CERTDIR: ""

services:
  - docker:19.03.12-dind

build:
  image: docker:19.03.12
  before_script:
    - docker login -u $TOKEN_USERNAME -p $TOKEN_PASSWORD $CI_DEPENDENCY_PROXY_SERVER
  script:
    -  docker pull ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/php:7-fpm-alpine3.15

I've used a token created in my group but in console show that error

Error response from daemon: unauthorized: authentication required

Answer 1

Are $TOKEN_USERNAME and $TOKEN_PASSWORD defined? The documentation says to use the predefined variables $CI_DEPENDENCY_PROXY_USER and $CI_DEPENDENCY_PROXY_PASSWORD.

docker login -u $CI_DEPENDENCY_PROXY_USER -p $CI_DEPENDENCY_PROXY_PASSWORD $CI_DEPENDENCY_PROXY_SERVER