Hi @flatine69, and welcome to the community.
Thank you for supporting Rockstor’s development! I’ll try to bring some information that will hopefully help.
Thank you as well for using our installer recipe and running Rockstor-4.0.4. Docker (non-CE) was the package used back in our now very old ISO installer on CentOS base, and was updated to Docker-ce later down the road. This means that the only system on which Docker (non-CE) would still be installed would be Rockstor-3.9.1-0. In other words, we now rely (especially in Rockstor 4) on upstream repositories from openSUSE to install docker, which thus installs docker-ce:
# yum info docker
Name : docker
Version : 19.03.11_ce
Release : lp152.1.1
Architecture : x86_64
Size : 143 M
Source : docker-19.03.11_ce-lp152.1.1.src.rpm
Repository : @System
Summary : The Moby-project Linux container runtime
URL : http://www.docker.io
License : Apache-2.0
Description : Docker complements LXC with a high-level API which operates at the process
: level. It runs unix processes with strong guarantees of isolation and
: repeatability across servers.
: Docker is a great building block for automating distributed systems: large-scale
: web deployments, database clusters, continuous deployment systems, private PaaS,
: service-oriented architectures, etc.
Could you verify what is installed on your system?
yum info docker
as welll as Rockstor version just to make sure:
yum info rockstor
This should give us a better idea of what is going on.