[CentOS-devel] Using mirrorlist for Atomic

Anssi Johansson

avij at centosproject.org
Thu Sep 12 18:22:35 UTC 2019

Anssi Johansson kirjoitti 1.2.2019 klo 4.01:
> Anssi Johansson kirjoitti 21.12.2018 klo 22.14:
>> Hi, as mentioned in 
>> https://lists.centos.org/pipermail/centos-devel/2018-September/016949.html 
>> mirrorlist.centos.org has been updated to produce mirror lists for SIG 
>> content as well. Some centos-release-* packages have already been 
>> modified to use mirrorlist.centos.org instead of mirror.centos.org, 
>> but many still point to mirror.centos.org.
>> Most of mirror.centos.org hosts are also used for seeding the 600+ 
>> external mirrors we have. By directing some of their download traffic 
>> to external mirrors we can offer faster sync speeds for those external 
>> mirrors, and for people downloading individual rpms from 
>> mirror.centos.org. Second, most of those external mirrors offer faster 
>> download speeds to end users than what could be achieved by 
>> downloading from mirror.centos.org, so the users will benefit from 
>> this change as well. The better geographical coverage does not hurt 
>> either. mirror.centos.org nodes are donated servers, and it would be 
>> kind to the sponsors to use their bandwidth sparingly.
>> The .repo files should be modified so that the current baseurl line 
>> gets commented out and a mirrorlist entry gets added, like this:
>> mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=storage-gluster-4.1 
>> #baseurl=http://mirror.centos.org/$contentdir/$releasever/storage/$basearch/gluster-4.1/ 
>> Note that mirrorlist.c.o can automatically choose between main and 
>> altarch content based on the arch parameter. The repo names are 
>> constructed from the repository path by stripping away the 
>> architecture and changing any slashes to dashes: sclo/x86_64/rh -> 
>> sclo-rh, sclo/x86_64/sclo -> sclo-sclo, 
>> paas/x86_64/openshift-origin311 -> paas-openshift-origin311, 
>> storage/x86_64/gluster-5 -> storage-gluster-5 etc. You can use 'curl' 
>> to check what mirrorlist outputs for your repository.
>> New repos are added to mirrorlist.centos.org automatically once the 
>> repository hits mirror.centos.org. That script is currently run every 
>> three hours. I guess it could be run more frequently (it's fairly 
>> lightweight), but you should give the external mirrors a few hours to 
>> sync before announcing your release anyway.
>> You can either submit an update to your current centos-release-* file 
>> now, or wait until you need to create a new centos-release-* package 
>> for other reasons such as releasing softwarepackage-(version+1) which 
>> uses different paths. My recommendation would be to submit an update 
>> to your current centos-release-* package, so that you would not need 
>> to worry about this when you eventually need to publish a new one for 
>> other reasons. We released an updated centos-release package for 
>> CentOS AltArch before 7.6.1810 was released for this exact reason, ie. 
>> we didn't need to worry about this change at 7.6.1810 release time.
>> Other people (such as bstinson, arrfab and hughesjr) can probably help 
>> with creating and publishing an updated centos-release-* package, but 
>> the usual tagging procedure to extras will apply. The SIG Guide 
>> https://wiki.centos.org/SIGGuide should have all the needed details 
>> for this (if not, complain to bstinson). It is highly recommended to 
>> actually test your new centos-release-* package from buildlogs before 
>> you ask that package to be signed and pushed to extras.
>> The holiday season is fast approaching so (I) don't expect much 
>> activity regarding these changes in the following days. I'm hoping 
>> that the SIGs would take a look at this in early 2019, though. Thanks 
>> to those SIGs who have already made these changes to their 
>> centos-release-* packages!
>> If you have questions, feel free to ask either here or on 
>> #centos-devel. Thanks for your time!
> I forgot to mention this, but something like this might work for Atomic:
> /etc/ostree/remotes.d/centos-atomic-host.conf
> [remote "centos-atomic-host"]
> url=http://mirror.centos.org/centos/7/atomic/x86_64/repo
> contenturl=mirrorlist=http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=atomic-repo 
> branches=centos-atomic-host/7/x86_64/standard;
> gpg-verify=true
> Retaining the existing 
> "url=http://mirror.centos.org/centos/7/atomic/x86_64/repo" would get the 
> metadata from mirror.c.o, but adding that 
> contenturl=mirrorlist=http://mirrorlist.c.o/?..." after it would make 
> the update process get the biggest chunks of data from external mirrors.
> Please take that centos-atomic-host.conf modification request with a 
> grain of salt, I'm not particularly knowledgeable of Atomic internals, 
> but it seemed to work in my testing. That 
> "contenturl=mirrorlist=http://mirrorlist.centos.org/?..." syntax looked 
> odd, but that's apparently how it's supposed to be.

Would it be possible to get this implemented? It saddens me that Atomic 
gets mirrored worldwide, but the mirrored data does not really get used.

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