title: Permission denied when mounting Docker volume in OSX
body: <p>I'm at my wit's end with this, so hopefully you folks can help me. In OSX 10.11.2 with docker-machine, I've got a docker-compose file that should build a local Dockerfile and attach a MySQL container to it. The MySQL container should mount a local folder where I'm storing my database data, so if the container or VM comes down, I can just restart it without data loss. Problem is, when I run it, it throws a permissions error:</p>
  
  <pre><code>db_1  | 2015-12-23 19:17:59 7facaa89b740  InnoDB: Operating system error number 13 in a file operation.
  db_1  | InnoDB: The error means mysqld does not have the access rights to
  db_1  | InnoDB: the directory.
  </code></pre>
  
  <p>I've tried every permutation I can think of to get this to work. I was reading around and it may have something to do with how docker-machine handles permissions with OSX, but the documentation for docker-machine says that it mounts the <code>/Users</code> folder, so that shouldn't be an issue.</p>
  
  <p>Here's the <code>docker-compose.yml</code>:</p>
  
  <pre><code>web:
    build: .
    ports:
      - "3000:3000"
    links:
      - db
  db:
    image: mysql:5.6
    ports:
      - "3306:3306"
    volumes:
      - /Users/me/Development/mysql-data:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: mypass
  </code></pre>
  
  <p>Any ideas? I can't help but think it's something really simple. Any help would be most appreciated!</p>
  
  <p><strong>Edit:</strong></p>
  
  <ul>
  <li>Host - <code>drwxr-xr-x   7 me  staff   238 Dec 23 12:10 mysql-data/</code></li>
  <li>VM   - <code>drwxr-xr-x    1 docker   staff          238 Dec 23 20:10 mysql-data/</code></li>
  </ul>
  
  <p>As to the container, it won't run with the volume mounted. Without the <code>-v</code> mount, it is:</p>
  
  <ul>
  <li>Container - <code>drwxr-xr-x  4 mysql mysql 4096 Dec 24 00:37 mysql</code></li>
  </ul>