[Solved] You have this GitLab CI job configuration: build: image: docker:latest script: - docker build -t myapp . services: - docker:dind The job fails with error: Cannot connect to the Docker daemon.... | Docker

Docker - in CI/CD

You have this GitLab CI job configuration:

build:
  image: docker:latest
  script:
    - docker build -t myapp .
  services:
    - docker:dind

The job fails with error: Cannot connect to the Docker daemon. What is the most likely fix?

A

Add <code>variables:
  DOCKER_HOST: tcp://docker:2375</code> to the job

BChange image to <code>docker:dind</code>

CRemove the services section

DAdd <code>docker login</code> before build

Step-by-Step Solution

Solution:

Step 1: Identify cause of Docker daemon connection error
The error means the Docker client inside the job cannot reach the Docker daemon running in the docker:dind service container.
Step 2: Fix connection by setting DOCKER_HOST variable
Setting DOCKER_HOST: tcp://docker:2375 tells the Docker client to connect to the dind service over TCP, enabling communication.
Final Answer:
Add variables: DOCKER_HOST: tcp://docker:2375 to the job -> Option A
Quick Check:
Set DOCKER_HOST to connect client to dind daemon [OK]

Quick Trick: Set DOCKER_HOST to tcp://docker:2375 to fix connection [OK]

Common Mistakes:

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