I have set up a simple .gitlab-ci file which should be able to run docker service:
docker:
image: google/cloud-sdk:latest
variables:
DOCKER_DRIVER: overlay2
DOCKER_HOST: tcp://127.0.0.1:2375
services:
- docker:dind
tags:
- docker
script:
- docker pull buster-slim
However it fails as:
https://gitlab.com/knyttl/runnerdemo/-/jobs/932204050
2020-12-25T19:31:04.558361767Z time="2020-12-25T19:31:04.558195638Z" level=info msg="API listen on [::]:2375"
2020-12-25T19:31:04.558522591Z time="2020-12-25T19:31:04.558447616Z" level=info msg="API listen on /var/run/docker.sock"
The service apparently correctly starts, but then it doesn't work:
Cannot connect to the Docker daemon at tcp://127.0.0.1:2375. Is the docker daemon running?
In fact, the only reason why this was not working was:
DOCKER_HOST: tcp://docker:2375
The dind service CAN run within cloud-sdk image, but it needs to be linked as a host.