> > 
> > Is it "too hard" to provide a solution for the OP and for myself? How come
> > RHEL/SL/CentOS-8 does not come preinstalled with a package
> > to "boot an SL3/SL4/SL5/RHEL6/RHEL7 VM image now!". (Yes, we still have
> > hardware that required an m68k crosscompiler that runs on SL4. We even have
> > a physical machine for this, a dual 500 MHz Pentium-II tower).
> 
> Yes it's kind of sad. However, containers have been mentioned in this thread already, and they do scratch a lot of those itches in a very elegant and cheap way.
> 

If you know the magic incantation to boot old SL/RHEL images (tarballs or rsync's)
in a container on RHEL 7 or 8 or on Ubuntu LTS 20.04, or if you can point me to such incantations,
I would greatly appreciate it!

I am sure I am capable of figuring it out myself, this task has been roughly
in the middle of my to-do list for the last 2-3 years.

Thanks in advance!

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada