On Tue, Jun 2, 2020 at 3:22 PM Alfredo Moralejo Alonso <amoralej@redhat.com> wrote:
On Tue, Jun 2, 2020 at 4:06 PM David Ivey <david.j.ivey@gmail.com> wrote:
For me, Stein still had a lot of issues with python3 when I tried to use it, but I had tried the upgrade shortly after Stein had released so those issues may have been resolved by now. I ended up reverting back to Rocky and python2.7, My first real stable build with python3 was with the Train release on Ubuntu18.04, so I skipped the Stein release.
Someone can correct me if I am wrong, but last I checked, CentOS 7 did not have the python3 packages in RDO. So if using CentOS 7; RDO does not have Ussuri and the latest release there is Train with python2.7. If using CentOS 8 and the Ussuri release; RDO released the python3 packages last week.
CentOS 7 has some limited python3 support but at RDO we didn't do any release with python3 on CentOS 7.
In RDO you have python3 packages for CentOS 8 for both Train and Ussuri.
I have not tried Ussuri on CentOS 8 yet.
David
On Tue, Jun 2, 2020 at 8:25 AM Sean McGinnis <sean.mcginnis@gmx.com> wrote:
On 6/2/20 6:34 AM, Neil Jerram wrote:
Does anyone know the most recent OpenStack version that _can't_ easily be run with Python 3? I think the full answer to this may have to consider distro packaging, as well as the underlying code support.
For example, I was just looking at switching an existing Queens setup, on Ubuntu Bionic, and it can't practically be done because all of the scripts - e.g. /usr/bin/nova-compute - have a hashbang line that says "python2".
So IIUC Queens is a no for Python 3, at least in the Ubuntu packaging.
Do you know if this is equally true for later versions than Queens? Or alternatively, if something systematic was done to address this problem in later releases? E.g. is there a global USE_PYTHON3 switch somewhere, or was the packaging for later releases changed to hardcode "python3" instead of "python2"? If so, when did that happen?
Stein was the release where we had a cycle goal to get everyone using Python 3:
https://governance.openstack.org/tc/goals/selected/stein/python3-first.html
Part of the completion criteria for that goal was that all projects should, at a minimum, be running py3.6 unit tests. So a couple of caveats there - unit tests don't always identify issues that you can run in to actually running full functionality, and not every project was able to complete the cycle goal completely. Most did though.
So I think Stein likely should work for you, but of course Train or Ussuri will have had more time to identify any missed issues and the like.
I hope this helps.
Sean
Many thanks Sean, David and Alfredo. So, IIUC, with RDO and CentOS 8 it sounds like Train and Ussuri should be good. Stein should also be fine code-wise, but responses so far don't mention available packaging for that. Also if anyone can point to information about Debian/Ubuntu packaging for these releases with Python 3, that would be great. Best wishes, Neil