Symfony2 Permissions - Nabbed of a page to ensure I can find the damn thing.

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Install and enable ACL

First you need to install ACL, preferrably through your package manager; aptitude on Ubuntu, pacman on Arch, yum on Fedora, etc:

$ sudo aptitude install acl
Then you edit your /etc/fstab to enable ACL for your partition. Simply add acl to the list of options.

/dev/sda1 / ext4 rw,auto,acl 0 1
Then lastly remount the partition to have the new options take effect.

$ sudo mount -o remount /
Linux file permissions

With ACL enabled for your partition, we can now solve our problem using three ingenious Linux tricks.

First we change the ownership of our directories, so that they are owned by our www-data group.

$ sudo chown -R :www-data app/cache app/logs
Then we set a sticky guid on them. This ensures that new files and directories are automatically owned by the same group as their parent.

$ sudo chmod g+s app/cache app/logs
Per default new files and directories are not writable by their group owner and so the last piece of our puzzle is to use the previously enabled ACL to change that.

$ sudo setfacl -dR -m g::rwX app/cache app/logs