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-0time="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
