Auto Build Dockerfile error

Running with gitlab-ci-multi-runner 9.5.1 (96b34cc)
  on localhost.localdomain (7943c9b6)
Using Docker executor with image docker:git ...
Starting service docker:dind ...
Pulling docker image docker:dind ...
Using docker image docker:dind ID=sha256:b12c0db765b447f4f912cffc2a372466b4af1c9c9b1c57aea364df5ee61afc0c for docker service...
Waiting for services to be up and running...
Using docker image sha256:5bd90141f634f8edec7b3d2ed2924cd668fe590556b689c1a6495821d2ff45b5 for predefined container...
Pulling docker image docker:git ...
Using docker image docker:git ID=sha256:4d76de70e898910d9fcb67a1153d9446a5e576fa9c36c6b5d0a8ccd82cb92142 for build container...
Running on runner-7943c9b6-project-77-concurrent-0 via localhost.localdomain...
Fetching changes...
HEAD is now at 5d8e240 Delete .gitlab-ci.yml
Checking out 5d8e2409 as master...
Skipping Git submodules setup
$ # Auto DevOps variables and functions # collapsed multi-line command
$ setup_docker
$ build
Building Dockerfile-based application...
time="2017-10-27T08:27:31Z" level=error msg="failed to dial gRPC: cannot connect to the Docker daemon. Is 'docker daemon' running on this host?: dial unix /var/run/docker.sock: connect: no such file or directory"
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
ERROR: Job failed: exit code 1

我启用了 Auto DevOps 功能用来自动构建 Docker 镜像 提示找不到 /var/run/docker.sock 我已经注意到文档里面关于selinux的描述，检查了selinux 日志，并没有错误

The following are machine translation

I enabled the Auto DevOps feature to automatically build Docker mirroring The hint could not find/var/run/docker. Sock I have noticed the description of the SELinux in the document, checked the SELinux log, and no error