GitLab CI with Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the Docker image used in the GitLab CI job.

Docker

image: [1]

Drag options to blanks, or click blank then click option'

Adocker:latest

Bubuntu:20.04

Cpython:3.12

Dnode:latest

Attempts:

3 left

💡 Hint

Common Mistakes

Using an image without Docker installed, so Docker commands fail.

Choosing an unrelated image like node or python when Docker is needed.

The image keyword in GitLab CI specifies the Docker image to use for the job. Using docker:latest allows Docker commands inside the job.

2fill in blank

medium

Complete the code to enable Docker commands in the GitLab CI job by specifying the service.

Docker

services:
  - [1]

Drag options to blanks, or click blank then click option'

Apostgres:latest

Bdocker:latest

Cubuntu:20.04

Ddocker:dind

Attempts:

3 left

💡 Hint

Common Mistakes

Using the main Docker image as a service instead of the Docker-in-Docker service.

Using unrelated services like Postgres.

The docker:dind service runs Docker-in-Docker, allowing Docker commands to run inside the CI job.

3fill in blank

hard

Fix the error in the GitLab CI job to allow Docker commands by setting the correct variable.

Docker

variables:
  [1]: "/certs"

Drag options to blanks, or click blank then click option'

ADOCKER_DRIVER

BDOCKER_HOST

CDOCKER_TLS_CERTDIR

DDOCKER_TLS_VERIFY

Attempts:

3 left

💡 Hint

Common Mistakes

Setting unrelated Docker environment variables that do not enable TLS certs.

Omitting this variable causing Docker commands to fail.

Setting DOCKER_TLS_CERTDIR to "/certs" enables TLS certificates for secure Docker daemon communication in GitLab CI.

4fill in blank

hard

Fill both blanks to define a job that builds a Docker image and pushes it to a registry.

Docker

build_image:
  stage: build
  script:
    - docker build -t [1] .
    - docker push [2]

Drag options to blanks, or click blank then click option'

Amyregistry/myimage:latest

Bmyregistry/myimage:stable

Dmyregistry/myimage:dev

Attempts:

3 left

💡 Hint

Common Mistakes

Using different tags for build and push causing push to fail.

Using invalid image tags.

Both build and push commands must use the same image tag to ensure the correct image is pushed.

5fill in blank

hard

Fill all three blanks to define a GitLab CI job that logs in to Docker registry, builds, and pushes an image.

Docker

deploy:
  stage: deploy
  script:
    - echo $[1] | docker login -u $[2] --password-stdin $CI_REGISTRY
    - docker build -t [3] .
    - docker push [3]

Drag options to blanks, or click blank then click option'

A$CI_REGISTRY_PASSWORD

B$CI_REGISTRY_USER

Cmyregistry/myapp:prod

D$CI_REGISTRY_TOKEN

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up username and password variables.

Using different tags for build and push.

Forgetting to pipe the password to docker login.

The job uses $CI_REGISTRY_PASSWORD to login, $CI_REGISTRY_USER as username, and tags the image consistently for build and push.