Kernel 3.16 is delivered by default with debian8. It is actually the only one you have with a fresh install.
You add Kernel backports if you need a higher version of the kernel.
There must be something else preventing you from installing docker.
My bad. Did not see the OMV 2.x Tag the first time.
Just forget what I wrote.
lol no worries. i guess maybe i should look into upgrading to 3. i read before that the best way is to do a fresh install, but the only thing im worried about in the upgrade is messing up my RAID setup
edit: i think im just going to upgrade this weekend