[Solved] Given this GitLab CI job snippet, what will be the output of the docker ps command inside the job? job: image: docker:latest services: - docker:dind script: - docker info - docker ps | Docker

Docker - in CI/CD

Given this GitLab CI job snippet, what will be the output of the docker ps command inside the job?

job:
  image: docker:latest
  services:
    - docker:dind
  script:
    - docker info
    - docker ps

AShows an error: Docker daemon not running

BLists running containers inside the dind service (likely empty)

CLists containers on the host machine

DOutputs the Docker version only

Step-by-Step Solution

Solution:

Step 1: Understand the environment of the job
The job uses docker:dind service, which runs a Docker daemon inside the CI environment. The docker ps command connects to this daemon.
Step 2: Predict the output of docker ps
Since the job just started and no containers were run inside the dind daemon, docker ps will list running containers inside the dind environment, which is likely empty.
Final Answer:
Lists running containers inside the dind service (likely empty) -> Option B
Quick Check:
docker ps inside dind = running containers (empty if none) [OK]

Quick Trick: docker ps shows containers inside dind, not host [OK]

Common Mistakes:

Master "in CI/CD" in Docker

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Given this GitLab CI job snippet, what will be the output of the docker ps command inside the job?