@iain0404 Welcome to the Rockstor community.
Re:
Well done. any comments on how we could improve this process would be welcome given you are now among the increasing number of successful self-builders. And please done be shy in chipping in to help others who have struggled with our current instructions in this area. This all helps to see where our docs on this can be improved.
You are likely experiencing an upstream issue first reported by @Emmanuel_perez and confirmed by @sanderweel with docker on systems with IPv6 disabled. See the following forum post by @sanderweel for details.
This has now been fixed upstream and we are awaiting it’s appearance in Leap 15.2/15.2 which is used in the new Rockstor 4 “Built on openSUSE” variant.
However for the time being you could following the work-around (downgrade docker) presented by @sanderweel and confirmed again by @Emmanuel_perez with an @Flox investigation there after.
Bit of a pain this one but at least an upstream fix is in the process of filtering it’s way down to our upstream (Leap 15.2/15.2).
Hope that helps.