title: error with docker build stage of CodeBuild build
body: <p>I am getting the following error from the BUILD stage of my CodeBuild build process:</p>
  
  <p>"Error while executing command: docker build -t ..." Reason: exit status 1</p>
  
  <p>I have a code build service role set up with permissions for ecr, the aws ecr login stage has succeeded, and my buildspec.yml is really simple - pretty much just the standard template. Runtime is the Amazon-managed ubuntu image, standard. </p>
  
  <p>Is there any reason why the Docker build could be failing and anything anyone would suggest to troubleshoot? </p>
  
  <p>Thank you</p>
  
  <p><strong>Full buildspec.yml file:</strong></p>
  
  <pre><code>version: 0.2
  
  phases:
    pre_build:
      commands:
        - echo Logging in to Amazon ECR...
        - $(aws ecr get-login --no-include-email --region eu-west-1)
    build:
      commands:
        - echo Building the Docker image...          
        - docker build -t maxmind:latest .
        - docker tag maxmind:latest 381475286792.dkr.ecr.eu-west-1.amazonaws.com/maxmind:latest      
    post_build:
      commands:
        - echo Build completed on `date`
        - echo Pushing the Docker image...
        - docker push 381475286792.dkr.ecr.eu-west-1.amazonaws.com/maxmind:latest
  </code></pre>
  
  <p><strong>Full error message (BUILD stage):</strong></p>
  
  <pre><code>COMMAND_EXECUTION_ERROR: Error while executing command docker build -t maxmind:latest .. Reason: exit status 1
  </code></pre>
  
  <p><strong>Full error message (POST_BUILD stage):</strong></p>
  
  <pre><code>COMMAND EXECUTION_ERROR: Error while executing command: docker push 381475286792.dkr.ecr.eu-west-1.amazonaws.com/maxmind:latest. Reason: exit status 1
  </code></pre>
  
  <p><strong>Full error message (logstream)</strong>:</p>
  
  <pre><code>[Container] 2020/05/20 09:28:54 Running command docker build -t maxmind:latest .
  Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
  
  [Container] 2020/05/20 09:28:54 Command did not exit successfully docker build -t maxmind:latest . exit status 1
  [Container] 2020/05/20 09:28:54 Phase complete: BUILD State: FAILED
  </code></pre>
  
  <p><strong>Things I have tried</strong></p>
  
  <p>Attached AmazonEC2ContainerRegistryPowerUser policy to the codebuild-service-role created by my build process</p>