You want to build a Docker image and push it to GitLab Container Registry in a GitLab CI job. Which snippet correctly sets up the job with Docker-in-Docker and pushes the image?

hard📝 Workflow Q15 of 15

Docker - in CI/CD

build_and_push:
  image: docker:latest
  services:
    - docker:dind
  variables:
    DOCKER_HOST: tcp://docker:2375
    DOCKER_TLS_CERTDIR: ""
  script:
    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
    - docker build -t $CI_REGISTRY_IMAGE:latest .
    - docker push $CI_REGISTRY_IMAGE:latest

ANo docker login command before push

BMissing DOCKER_HOST variable, so Docker commands fail

CUses docker:dind as image instead of service

DCorrect setup with variables and login before build and push

Step-by-Step Solution

Solution:

Step 1: Check Docker-in-Docker setup
The job uses docker:dind as a service and sets DOCKER_HOST and disables TLS cert dir, which is required for Docker commands to connect properly.
Step 2: Verify login and push steps
The job logs into the GitLab Container Registry using CI variables, then builds and pushes the image with correct tags.
Final Answer:
Correct setup with variables and login before build and push -> Option D
Quick Check:
Proper dind setup + login + build + push = Correct setup with variables and login before build and push [OK]

Quick Trick: Always login before push and set DOCKER_HOST for dind [OK]

Common Mistakes:

Forgetting DOCKER_HOST causes connection errors
Using docker:dind as image instead of service
Skipping docker login before push

Master "in CI/CD" in Docker

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More Docker Quizzes

You want to build a Docker image and push it to GitLab Container Registry in a GitLab CI job. Which snippet correctly sets up the job with Docker-in-Docker and pushes the image?

Step 1: Check Docker-in-Docker setup

Step 2: Verify login and push steps

Final Answer:

Quick Check:

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