That’s unfortunate that it didn’t work.
Have you found instructions to get Docker to a recent release on CentOS7? the risk on the existing docker images (i.e. Rockons), etc. is probably fairly low, since no docker build activity is done with any of these. However, if something does get messed up, you likely do look at a reinstall … your data pools won’t be affected by it, but, it still means that things like HA might not be operable until the system is fixed. So, I would recommend not to do it. If you do, for sure take a settings backup via the Rockstor WebUI and store it on another machine. So, in case you have to re-install (or actually move to the next gen Rockstor), you won’t have to install everything from scratch. Note, though that there was a fix for a failure to re-import nfs shares recently, not sure that problem existed in the CentOS (likely, though).
I would consider attempting to update Rockstor to an built on OpenSUSE version. Do you remember what pool import issues you’ve had? Do you occasionally run a scrub on your current pool? And, before you restore everything (see config backup comment I made), ensure you’re on the latest test channel to begin with, so all shares are restored appropriately.