Apache and passenger behave differently on Docker mac vs ubuntu

Question

I'm experiencing some issues with containers running apache2 + passenger phusion + rails app when I deploy them on mac or linux. I use the same image (based on ubuntu:14.04) pulled from the docker hub and the same run command

docker run -it -p 80:80 -p 443:443 -e RAILS_ENV=development --link pg my-image-name

On OSX 10.10.5, running docker 1.9.1, build a34a1d5 everything works fine. On my production server ubuntu 14.04.3 LTS, running the same docker version, I get the following error

AH00035: access to / denied (filesystem path '/home/app/app') because search permissions are missing on a component of the path

Permissions are set with chmod 775 -R /home/app. Here is passenger and apache version + configuration

Server version: Apache/2.4.7 (Ubuntu)
Server built:   Oct 14 2015 14:20:21
Phusion Passenger 5.0.22
<VirtualHost *:80>
    ServerName www.my-app.com
    DocumentRoot /home/app/app/public
    PassengerRuby /usr/bin/ruby
    RailsEnv development
    ErrorLog "/home/app/app/log/apache_error_log"
    CustomLog "/home/app/app/log/apache_access_log" common
    <Directory /home/app/app/public>
       AllowOverride all
       Options -MultiViews +FollowSymLinks +Indexes
       Require all granted
       Order allow,deny
       allow from all
    </Directory>
</VirtualHost>

Any idea why I'm getting two different behaviours between OS X and Ubuntu running the same container?

Thanks

Answer 1

As commented in issue 16741 :

I think I've seen a similar issue, which was related to the aufs driver.

Fixed by using "devicemapper" instead of "aufs" thanks to this post:
" Switching Docker from aufs to devicemapper "

changed /etc/default/docker to enable device mapper:
(save the images first)

# Use DOCKER_OPTS to modify the daemon startup options.
DOCKER_OPTS="--storage-driver=devicemapper"

The OP Alberto Sabaini confirms it works:

I thought that Ubuntu LTS would be using device mapper as default, but by typing docker info | grep Storage docker info | grep Storage , I get Storage Driver: aufs in both mac and Ubuntu.
The weird part is that my image spin fine on mac with aufs and on Ubuntu on device mapper.