gitlab-runner on windows in docker fails to run with wrong OSType error

Question

I have a gitlab-runner on a Windows Server with enabled Hyper-V.

With the docker API exposed to the network I'm able to run linux docker containers and even docker itself with docker:latest.

e:\>docker run -ti --rm -e DOCKER_HOST=tcp://10.99.0.12:2375 --name test docker:latest

/ # docker ps
CONTAINER ID ....
xxxxx docker:latest ... Up 10 seconds

/ # docker run -ti --rm busybox uname -a
Linux 42342423 4.14.35 ... 

So that seems to be all correct.

When I now want to run a docker-compose up -d in my deploy stage, I'll get an error from gitlab-runner

Running with gitlab-runner 12.10.0 (c553af1a)
   on Staging Runner
Preparing the "docker" executor
 ERROR: Removing network for build
 ERROR: Job failed: executor requires OSType=linux, but Docker Engine supports only OSType=windows

I maybe could run gitlab-runner directly on the host machine, but rather have everything in the repository and only need to have docker installed.

Answer 1

I've run into this recently. You have to go into Docker on your Windows host and select the "Switch to Linux containers..." option.

Related:

• Gitlab CI - ERROR: Job failed: executor requires OSType=linux, but Docker Engine supports only OSType=windows

Answer 2

For everyone coming across this with the same problem.

Gitlab doesn't want to implement LCOW at the moment so it's not possible with docker-executor.

More info: https://gitlab.com/gitlab-org/gitlab-runner/-/issues/4373