unable to install Docker cli on a ReadyNAS 628X

Hi

I did a bit of digging via ssh to get it working here on an x86 variant (516)

First up was add a few sources to apt, because Jessie is no more

nano /etc/apt/sources.list
deb http://deb.debian.org/debian/ stretch main non-free contrib
deb https://download.docker.com/linux/debian jessie stable

Then make sure you have the keys to use the repos via

apt update
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <replace-key-here>

Finally

apt install docker-ce docker-cli-rnapp

Gave me docker in the apps part and usable via ssh for most apps, the biggest issue is the discs will never sleep unless you mount an ssd or usb etc as the /apps/docker… path.