[Devel] Re: "virt" modules and discrepancies vs Rocky

On Fri, 13 May 2022 at 08:12, Nux nux@li.nux.ro wrote:

Thanks both.

This is what I saw in that particular Rocky installation: https://pastebin.com/raw/bKnFMM9a

But I'll do a fresh comparison between all clones as soon as I get some time and try to get to the bottom of it.

OK, that is weird. It is showing each past 'version' like it was completely different. I am wondering if there is some sort of dnf config option in play here. It might be possible to set up dnf to not see each version in a stream as different enough so you could 'hard swap' between them versus let them update continuously.. something like RHEL/Alma config: compare stream and update to newer version of any release your system: compare stream:version and only update if forced with a swap.

I would check with Oracle and see how they are doing things also.

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Nux www.nux.ro

On 2022-05-13 13:03, Stephen John Smoogen wrote:

On Fri, 13 May 2022 at 06:18, Nux nux@li.nux.ro wrote:

Hello,

We've just been bit by some libvirt updates in our project (Apache Cloudstack) which basically broke basic functionality on AlmaLinux 8.4. I expected the same problem to happen on RockyLinux 8.4, however turns out the libvirt on this one was an older version and not even "yum update" changed this. On closer investigation I noticed Rocky actually ships 5 "virt" modules, according to "yum module info virt", my Alma test box only ships one, which is also very up to date.

No actual complaints here, but can someone explain to me why the discrepancy? Didn't use EL8 much, but expected all "clones" to be more or less identical, but turns out there are differences that matter.

Hmm I do not know what is going on with the Rocky side of things, but I am guessing there might have been a mismatch on how to build module 'versions' as module 'streams'. Let us look at perl and virt as examples. RHEL offers 4 perl streams with different lifetimes and support leveles ( https://access.redhat.com/support/policy/updates/rhel-app-streams-life-cycle ) and only one virt stream.

[root@vector-8 ~]# dnf module list perl
Updating Subscription Management repositories.
Last metadata expiration check: 1:11:06 ago on Fri 13 May 2022 06:44:03
EDT.
Red Hat Enterprise Linux 8 for x86_64 - AppStream (RPMs)
Name  Stream       Profiles             Summary

perl  5.24         common [d], minimal  Practical Extraction and Report
Language
perl  5.26 [d][e]  common [d], minimal  Practical Extraction and Report
Language
perl  5.30         common [d], minimal  Practical Extraction and Report
Language
perl  5.32         common [d], minimal  Practical Extraction and Report
Language

Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled
[root@vector-8 ~]# dnf module list virt
Updating Subscription Management repositories.
Last metadata expiration check: 1:11:20 ago on Fri 13 May 2022 06:44:03
EDT.
Red Hat Enterprise Linux 8 for x86_64 - AppStream (RPMs)
Name         Stream              Profiles           Summary

virt         rhel [d][e]         common [d]         Virtualization module


Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled

The virt module has had multiple versions over its lifetime with RHEL-8. The EPEL build system accidently keeps a list of them due to grobisplitter putting them into trees when they are first seen.

2019-09-19 virt:rhel:8000020190618154454:f8e95b4e:x86_64/
2019-11-07 virt:rhel:8000020190828150510:f8e95b4e:x86_64/
2019-12-18 virt:rhel:8010020190916153839:cdc1202b:x86_64/
2020-01-30 virt:rhel:8010020191202185848:c27ad7f8:x86_64/
2020-04-08 virt:rhel:8010020191216093608:c27ad7f8:x86_64/
2020-04-29 virt:rhel:8010020200304114113:c27ad7f8:x86_64/
2020-07-01 virt:rhel:8020020200316135718:6a468ee4:x86_64/
2020-09-30 virt:rhel:8020020200601195459:4cda2c84:x86_64/
2020-11-03 virt:rhel:8020020200909224913:4cda2c84:x86_64/
2020-12-16 virt:rhel:8030020200909014558:30b713e6:x86_64/
2021-02-17 virt:rhel:8030020201123162111:229f0a1c:x86_64/
2021-03-04 virt:rhel:8030020210205201602:229f0a1c:x86_64/
2021-05-21 virt:rhel:8030020210210212009:229f0a1c:x86_64/
2021-08-11 virt:rhel:8040020210317013608:9f9e2e7e:x86_64/
2021-11-10 virt:rhel:8040020210721215855:522a0ee4:x86_64/
2021-12-22 virt:rhel:8050020211001230723:b4937e53:x86_64/
2022-02-02 virt:rhel:8050020211203195115:c5368500:x86_64/
2022-03-16 virt:rhel:8050020220113125354:c5368500:x86_64/
2022-04-27 virt:rhel:8050020220208234339:c5368500:x86_64/
2022-05-11 virt:rhel:8050020220322234807:c5368500:x86_64/
2022-05-11 virt:rhel:8060020220408104655:d63f516d:x86_64/

To a user you should see only one module stream which is virt:rhel. It should then continuously get updated when the 'version' of the module is updated and all the packages in this 'pseudo-repository' are updated en-mass. I do not know how Rocky has split things up and it could be for multiple reasons like they are offering alternative streams or their tooling at one point split things in different ways than RHEL does.

-- Stephen J Smoogen. Let us be kind to one another, for most of us are fighting a hard battle. -- Ian MacClaren

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