无法使用 Kubernetes 执行程序访问 gitlab 运行程序中的 docker 守护进程

Question

我使用 Kubernetes 设置我的 Gitlab 实例以进行部署，并使用 Kubernetes 集群执行我的 CI。 Kubernetes 是由 Gitlab 管理的，所以我从来没有亲自接触过 kubernetes。 Gitlab 安装四个可用的包：Helm Tiller Ingress、Cert-Manager、Prometheus 和 GitLab Runner。

我使用来自https://vitux.com/install-and-deploy-kubernetes-on-ubuntu/ 的教程在准系统服务器上安装了 Kubernetes 集群。服务器的操作系统是 Ubuntu 18.04 最小。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，我想在其中构建一个 docker 映像。我尝试使用 dind 服务通过部署在 kubernetes 平台上的 gitlab 运行器构建 docker 映像。

构建过程失败，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

源文件：

我使用的 Dockerfile 非常简单并且有效，因为我能够在本地机器上构建映像：

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

我正在使用的.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

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同样的错误：

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

跑步者的输出是：

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

Answer 1

所以我找到了解决方案。我认为问题在于我没有指定证书目录。通过将目录更改为""，它开始工作。

image: docker:stable

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

services:
  - docker:dind

before_script:
  - docker info

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