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[Gordon Messmer]

On 12/3/21 09:39, Cantor, Scott wrote:
> On 12/3/21, 12:06 PM, "users on behalf of Gordon Messmer" <users-bounces at shibboleth.net on behalf of gordon at dragonsdawn.net> wrote:
>
>>     To rephrase: CentOS Stream won't get any changes that the same major
>>     release of RHEL does not.  CentOS Stream 8 is no more a moving target
>>     than RHEL 8, it'll just get some packages before RHEL 8 does.  On either
>>     system, the stability of the interface has the same guarantee.
> That guarantee itself is zero.


The good news is that CentOS Stream is actually a *major* improvement 
over the status quo on this point.

In the past, CentOS bugs were sometimes accepted by Red Hat, but this 
was mostly on a case-by-case best-effort understanding.  If an RHEL 
update changed any of the interfaces outlined in the guarantee 
(https://access.redhat.com/articles/rhel8-abi-compatibility), then Red 
Hat would fix that, but that guarantee was made to their customers.

It is now the official policy of Red Hat that bugs in CentOS Stream are 
bugs in RHEL.  If any Stream user reports a change that breaks an 
interface listed in the compatibility guarantee, the bug report will be 
treated as any report from an RHEL customer would.

This is one of the changes that came with Stream that I'm most excited 
about.


> I suspect the issues with Ubuntu support are a more practical issue


As the risk of steering toward trivia:  Ubuntu's release cadence is 
basically indistinguishable from CentOS Stream.  Ubuntu LTS does have 
point releases, but they're mostly just a roll-up of updates.  Except 
for the "hardware enablement stack", they are not demarcation points for 
updates.


> As a practical matter, I think the packages will keep coming for now and I also would imagine that the Rocky and CentOS packages for a particular major version will be interchangeable and work 99% of the time across any of the different patch levels of all 3.


Yes, I'd expect any application that uses the interfaces outlined in the 
compatibility guide to work on any of those releases.