docker not found with docker:dind + google/cloud-sdk - docker

Question

I'm getting the error docker: command not found while running the following CI script inside gitlab-ci. This error is happening during before_script for the deploy phase.
services:
- docker:dind
stages:
- build
- test
- deploy
before_script:
- docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
build:
stage: build
image: docker:latest
script:
- docker info
- docker version
- docker build --pull -t $SERVICE_NAME:$CI_COMMIT_REF_NAME .
- docker image list
- docker tag $SERVICE_NAME:$CI_COMMIT_REF_NAME $CI_REGISTRY_IMAGE/$SERVICE_NAME:$CI_COMMIT_REF_NAME
- docker push $CI_REGISTRY_IMAGE/$SERVICE_NAME:$CI_COMMIT_REF_NAME
test:
image: docker:latest
stage: test
script:
- docker pull $CI_REGISTRY_IMAGE/$SERVICE_NAME:$CI_COMMIT_REF_NAME
- docker image list
- docker run $CI_REGISTRY_IMAGE/$SERVICE_NAME:$CI_COMMIT_REF_NAME npm test
deploy:
image: google/cloud-sdk
stage: deploy
environment: Production
script:
- echo $DEPLOY_KEY_FILE_PRODUCTION > /tmp/GCLOUD_KEYFILE.json
- gcloud auth activate-service-account --key-file /tmp/GCLOUD_KEYFILE.json
- rm /tmp/GCLOUD_KEYFILE.json
- gcloud info
- gcloud components list
only:
- master
I'm a bit confused, because I'm runing docker-in-docker (docker:dind) as a service so the docker command should be made available to all stages (if I understand this correctly), however it's clearly not.
Is it due to an interaction with google/cloud-sdk ?

Answer 1

You probably misunderstood what services mean. From the doc,
The services keyword defines just another docker image that is run during your job and is linked to the docker image that the image keyword defines.
What you need is a custom docker executor that uses dind image and preinstalled with gcloud sdk. You can build such an image with this Dockerfile:
FROM docker:latest
RUN apk add --no-cache \
bash \
build-base \
curl \
git \
libffi-dev \
openssh \
openssl-dev \
python \
py-pip \
python-dev
RUN pip install docker-compose fabric
RUN curl https://sdk.cloud.google.com | bash -s -- --disable-prompts

Answer 2

The question was asked almost 5 years ago, I am unsure if by that time the image google/cloud-sdk shipped without docker binaries, I can't think of anything else for a docker: command not found error more than it was not available in the standard location. Anyways, today 2022 google/cloud-sdk comes with docker and it can interact with the docker service, and since I ended up here several times after running into problems trying to use docker:dind and google/cloud-sdk, I will add the following:
Is possible to use docker from the google/cloud-sdk image, there is no need to create a custom image for your Gitlab CI. The problem is that docker in google/cloud-sdk tries to connect to the socket in /var/run/docker.sock as is presented in the logs:
$ docker build -t gcr.io/$GCP_PROJECT_ID/test:$CI_COMMIT_SHORT_SHA .
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
Anyways you can also checks in your logs of the service docker:dind that docker listens in a socket (not reachable from the job container) and a tcp port (reachable via the hostname docker). So, you just need to use the tcp port in your docker commands, either by setting the env variable DOCKER_HOST or adding a -H tcp://docker:2375 as in
$ docker -H tcp://docker:2375 build -t gcr.io/$GCP_PROJECT_ID/test:$CI_COMMIT_SHORT_SHA .
Step 1/8 : FROM python:latest

Answer 3

You forgot to inform the image tag at the top.
image: docker:latest
services:
- docker:dind
...
Works for me! :)
See: https://docs.gitlab.com/ce/ci/docker/using_docker_build.html