不需要使用此：
DOCKER_DRIVER: overlay
因为似乎不支持OVERLAY，所以svc-0容器无法启动它：
$ kubectl logs -f `kubectl get pod |awk '/^runner/{print $1}'` -c svc-0
time="2017-03-20T11:19:01.954769661Z" level=warning msg="[!] DON'T BIND ON ANY IP ADDRESS WITHOUT setting -tlsverify IF YOU DON'T KNow WHAT YOU'RE DOING [!]"
time="2017-03-20T11:19:01.955720778Z" level=info msg="libcontainerd: new containerd process, pid: 20"
time="2017-03-20T11:19:02.958659668Z" level=error msg="'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded."
另外，添加export DOCKER_HOST="tcp://localhost:2375"到docker-build：
docker-build:
stage: package
script:
- export DOCKER_HOST="tcp://localhost:2375"
- docker build -t gitlab.my.com/group/app .
- docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN gitlab.my.com/group/app
- docker push gitlab.my.com/group/app
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