On Tue, Jun 22, 2021 at 11:58 AM Martin Verges <martin.verges@croit.io> wrote:
There is no "should be", there is no one answer to that, other than 42. Containers have been there before Docker, but Docker made them popular, exactly for the same reason as why Ceph wants to use them: ship a known good version (CI tests) of the software with all dependencies, that can be run "as is" on any supported platform.
So ship it tested for container software XXX and run it on YYY. How will that benefit me as a user? There are differences when running a docker container, lxc, nspawn, podman, kubernetes and whatever. So you trade error A for error B. There are even problems with containers if you don't use version X from docker. That's what the past told us, why should it be better in the future with even more container environments. Have you tried running rancher on debian in the past? It breaks apart due to iptables or other stuff.
Rook is based on kubernetes, and cephadm on podman or docker. These are well-defined runtimes. Yes, some have bugs, but our experience so far has been a big improvement over the complexity of managing package dependencies across even just a handful of distros. (Podman has been the only real culprit here, tbh, but I give them a partial pass as the tool is relatively new.)