title: Cannot connect to the daemon docker in a docker image of docker
body: <p>I am trying to build CI with gitlab, I go from a docker image of docker, and i didn't have any problem with my front repository, but now with the back withe the same gitlab-ci configuration file, i have this daemon error.</p>
  
  <p>Here is the output of the build :</p>
  
  <pre><code>[0KRunning with gitlab-ci-multi-runner 1.10.4 (b32125f)[0;m
  [0;m[0KUsing Docker executor with image docker:1.13.1 ...
  [0;m[0KPulling docker image docker:1.13.1 ...
  [0;mRunning on runner-4e4528ca-project-1649638-concurrent-0 via runner-4e4528ca-machine-1487688057-7c0f1e46-digital-ocean-4gb...
  [32;1mCloning repository...[0;m
  Cloning into '/builds/***/formation-back'...
  [32;1mChecking out af7cbcae as docker...[0;m
  [32;1mSkipping Git submodules setup[0;m
  [32;1m$ docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com[0;m
  Warning: failed to get default registry endpoint from daemon (Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?). Using system default: https://index.docker.io/v1/
  Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
  [31;1mERROR: Build failed: exit code 1
  [0;m
  </code></pre>
  
  <p>Here is my .gitlab-ci.yml :</p>
  
  <pre><code>image: docker:1.13.1
  
  stages:
    - build
    - test
    - deploy
  
  variables:
    BUILD_IMG: $CI_REGISTRY_IMAGE:$CI_BUILD_REF
    TEST_IMG: $CI_REGISTRY_IMAGE:$CI_BUILD_REF_NAME
    RELEASE_IMG: $CI_REGISTRY_IMAGE:latest
    AWS_STAGING_ENV: "***"
    AWS_PROD_ENV: "***"
    DOCKERRUN: Dockerrun.aws.json
    DEPLOY_ARCHIVE: ${AWS_APP}-${CI_BUILD_REF}.zip
  
  before_script:
    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com
    - .ci/before_script
  
  build:
    stage: build
    script:
    - docker build --pull -t $BUILD_IMG .
    - docker push $BUILD_IMG
  
  test:
    stage: test
    script:
    - docker pull $BUILD_IMG
    - docker run --rm $BUILD_IMG npm run test
    - docker tag $BUILD_IMG $TEST_IMG
    - docker push $TEST_IMG
  
  deploy:staging:
    stage: deploy
    environment: Staging
    variables:
      DOCKER_IMG: ${CI_REGISTRY_IMAGE}:${CI_BUILD_REF}
    script:
    - ./.ci/create-deploy-archive $DOCKER_IMG $AWS_BUCKET $DOCKERRUN $DEPLOY_ARCHIVE
    - ./.ci/aws-deploy $DEPLOY_ARCHIVE $CI_BUILD_REF $AWS_STAGING_ENV
    artifacts:
      paths:
      - $DEPLOY_ARCHIVE
    except:
    - production
  
  deploy:production:
    stage: deploy
    environment: Production
    variables:
      DOCKER_IMG: ${CI_REGISTRY_IMAGE}:latest
    script:
    - .ci/push-new-image $TEST_IMG $RELEASE_IMG
    - .ci/create-deploy-archive $DOCKER_IMG $AWS_BUCKET $DOCKERRUN $DEPLOY_ARCHIVE
    - .ci/aws-deploy $DEPLOY_ARCHIVE $CI_BUILD_REF $AWS_PROD_ENV
    artifacts:
      paths:
      - $DEPLOY_ARCHIVE
    only:
    - production
    when: manual
  </code></pre>
  
  <p>Here is my config.toml file :</p>
  
  <pre><code>concurrent = 1
  check_interval = 0
  
  [[runners]]
    name = "***"
    url = "https://gitlab.com/ci"
    token = "750c63cba1c269d789bdb33c42b726"
    executor = "docker"
    [runners.docker]
      tls_verify = false
      image = "alpine:3.5"
      privileged = true
      disable_cache = false
      volumes = ["/cache", "/var/run/docker.sock:/var/run/docker.sock"]
    [runners.cache]
  </code></pre>
  
  <p>Here is docker info :</p>
  
  <pre><code>DEBU[0771] Calling GET /v1.24/info
  Containers: 1
   Running: 1
   Paused: 0
   Stopped: 0
  Images: 1
  Server Version: 1.12.6
  Storage Driver: devicemapper
   Pool Name: docker-202:1-395267-pool
   Pool Blocksize: 65.54 kB
   Base Device Size: 10.74 GB
   Backing Filesystem: xfs
   Data file: /dev/loop0
   Metadata file: /dev/loop1
   Data Space Used: 519 MB
   Data Space Total: 107.4 GB
   Data Space Available: 6.569 GB
   Metadata Space Used: 1.397 MB
   Metadata Space Total: 2.147 GB
   Metadata Space Available: 2.146 GB
   Thin Pool Minimum Free Space: 10.74 GB
   Udev Sync Supported: true
   Deferred Removal Enabled: false
   Deferred Deletion Enabled: false
   Deferred Deleted Device Count: 0
   Data loop file: /var/lib/docker/devicemapper/devicemapper/data
   WARNING: Usage of loopback devices is strongly discouraged for production use. Use `--storage-opt dm.thinpooldev` to specify a custom block storage device.
   Metadata loop file: /var/lib/docker/devicemapper/devicemapper/metadata
   Library Version: 1.02.93-RHEL7 (2015-01-28)
  Logging Driver: json-file
  Cgroup Driver: cgroupfs
  Plugins:
   Volume: local
   Network: bridge overlay null host
  Swarm: inactive
  Runtimes: runc
  Default Runtime: runc
  Security Options:
  Kernel Version: 4.4.44-39.55.amzn1.x86_64
  Operating System: Amazon Linux AMI 2016.09
  OSType: linux
  Architecture: x86_64
  CPUs: 1
  Total Memory: 995.2 MiB
  Name: ip-172-31-30-143
  ID: D6DU:OBWL:R3HK:DSZK:EOYC:5EHS:NU4I:4M3T:H5PL:JWLH:CIPD:I7VW
  Docker Root Dir: /var/lib/docker
  Debug Mode (client): false
  Debug Mode (server): true
   File Descriptors: 20
   Goroutines: 27
   System Time: 2017-02-22T11:16:19.042666914Z
   EventsListeners: 0
  Registry: https://index.docker.io/v1/
  Insecure Registries:
   127.0.0.0/8
  </code></pre>