我使用Kubernetes设置了我的Gitlab示例来部署，并使用Kubernetes集群执行CI。Kubernetes由Gitlab管理，所以我自己并没有接触过Kubernetes。Gitlab安装了四个可用包：Helm Tiller Ingress、Cert-Manager、Prometheus和GitLab Runner。
我使用以下教程在准系统服务器上安装了Kubernetes集群：https://vitux.com/install-and-deploy-kubernetes-on-ubuntu/。服务器的操作系统是Ubuntu 18.04 minimum。我发现Gitlab无法在Kubernetes 1.16版本上安装Helm Tiller，所以我在服务器上安装了Kubernetes 1.15.5-00版本。

问题：

我有一个项目，我想构建一个Docker镜像。我尝试使用dind服务来构建docker镜像，并使用部署在kubernetes平台上的gitlab runner。
生成过程失败，输出如下：

Running with gitlab-runner 12.1.0 (de7731dd)
  on runner-gitlab-runner-699dc9bcc8-sgmcw -YPHFGCL
Using Kubernetes namespace: gitlab-managed-apps
Using Kubernetes executor with image docker:stable ...
Waiting for pod gitlab-managed-apps/runner--yphfgcl-project-97-concurrent-0qj6sn to be running, status is Pending
Waiting for pod gitlab-managed-apps/runner--yphfgcl-project-97-concurrent-0qj6sn to be running, status is Pending
Waiting for pod gitlab-managed-apps/runner--yphfgcl-project-97-concurrent-0qj6sn to be running, status is Pending
Running on runner--yphfgcl-project-97-concurrent-0qj6sn via runner-gitlab-runner-699dc9bcc8-sgmcw...
Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/sadion/ci-test/.git/
Created fresh repository.
From https://git.sadion.net/sadion/ci-test
 * [new branch]      master     -> origin/master
Checking out d179001c as master...

Skipping Git submodules setup
$ docker --version
Docker version 19.03.4, build 9013bf583a
$ docker build -t $TEST_NAME .
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
ERROR: Job failed: command terminated with exit code 1

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源文件：

我使用的Dockerfile非常简单，也是有效的，因为我可以在本地机器上构建镜像：

FROM httpd:2.4
COPY ./index.html /usr/local/apache2/htdocs/

型
我使用的.gitlab-ci.yml文件是：

image: docker:stable

variables:
  TEST_NAME: local/test

services:
  - docker:dind

stages:
  - build

before_script:
  - docker info

build_docker_image:
  stage: build
  before_script:
    - docker --version
  script:
    - docker build -t $TEST_NAME .
  tags:
    - build
    - kubernetes

型

尝试导出DOCKER_HOST

我还尝试导出DOCKER_HOST变量。但是，配置后，我得到了相同的错误：

image: docker:stable

variables:
  TEST_NAME: local/test
  DOCKER_HOST: tcp://localhost:2375

services:
  - docker:dind

stages:
  - build

before_script:
  - docker info

build_docker_image:
  stage: build
  before_script:
    - docker --version
  script:
    - docker build -t $TEST_NAME .
  tags:
    - build
    - kubernetes

型
runner的输出是：

Running with gitlab-runner 12.1.0 (de7731dd)
  on runner-gitlab-runner-699dc9bcc8-sgmcw -YPHFGCL
Using Kubernetes namespace: gitlab-managed-apps
Using Kubernetes executor with image docker:stable ...
Waiting for pod gitlab-managed-apps/runner--yphfgcl-project-97-concurrent-042nmk to be running, status is Pending
Waiting for pod gitlab-managed-apps/runner--yphfgcl-project-97-concurrent-042nmk to be running, status is Pending
Waiting for pod gitlab-managed-apps/runner--yphfgcl-project-97-concurrent-042nmk to be running, status is Pending
Running on runner--yphfgcl-project-97-concurrent-042nmk via runner-gitlab-runner-699dc9bcc8-sgmcw...
Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/sadion/ci-test/.git/
Created fresh repository.
From https://git.sadion.net/sadion/ci-test
 * [new branch]      master     -> origin/master
Checking out 57b6be1d as master...

Skipping Git submodules setup
$ docker --version
Docker version 19.03.4, build 9013bf583a
$ docker build -t $TEST_NAME .
Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?
ERROR: Job failed: command terminated with exit code 1

型