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GitLab CI with docker and dind "mount: permission denied (are you root?)"

Hello!

I'm using gitlab-ci-multi-runner and I'm having a problem with docker and dind. Here's my gitlab CI YML file.

image: docker:latest

before_script:
  - apk add --no-cache python
  - docker --version

services:
  - docker:dind

docker:
  script:
    - cd docker/ && python build.py

I'm using the latest version of gitlab-ci-multi-runner

Version:      1.4.1
Git revision: fae8f18
Git branch:   1-4-stable
GO version:   go1.6.3
Built:        Mon, 25 Jul 2016 16:25:59 +0000
OS/Arch:      linux/amd64

But I've the following error message:

Running with gitlab-ci-multi-runner 1.4.1 (fae8f18)
Using Docker executor with image docker:latest ...
Pulling docker image docker:dind ...
Starting service docker:dind ...
Waiting for services to be up and running...

*** WARNING: Service runner-33015abb-project-89-concurrent-0-docker probably didn't start properly.

service runner-33015abb-project-89-concurrent-0-docker did timeout

2016-07-29T14:00:58.552656022Z mount: permission denied (are you root?)
2016-07-29T14:00:58.553653511Z Could not mount /sys/kernel/security.
2016-07-29T14:00:58.553662603Z AppArmor detection and --privileged mode might break.
2016-07-29T14:00:58.555400820Z mount: permission denied (are you root?)

*********

Pulling docker image docker:latest ...

I've found this following ticket with the same issue (https://gitlab.com/gitlab-com/support-forum/issues/795) but upgraded to the latest version didn't work for me.

Do you have an idea of the issue?

Thanks!