wrong logic behind country mirror url's ?

[Haw Loeung]

On Thu, Sep 17, 2020 at 08:21:20AM +0200, Mike Burgener wrote:
> I think there is some wrong logic behind the setup of for example
> ch.archive.ubuntu.com or de.archive.ubuntu.com
>
> lookup of the dns-entries result in the following:
>
> host ch.archive.ubuntu.com
> ch.archive.ubuntu.com is an alias for mirror.init7.net.
> mirror.init7.net has address 109.202.202.202
> mirror.init7.net has IPv6 address 2001:1620::1620
>
> host de.archive.ubuntu.com
> de.archive.ubuntu.com is an alias for ubuntu.mirror.tudos.de.
> ubuntu.mirror.tudos.de has address 141.30.62.24
> ubuntu.mirror.tudos.de has address 141.30.62.25
> ubuntu.mirror.tudos.de has address 141.30.62.22
> ubuntu.mirror.tudos.de has address 141.30.62.26
> ubuntu.mirror.tudos.de has address 141.30.62.23
>
> in my understanding this makes no sense, as this may result in the
> following.
>
> a) for example ubuntu.mirror.tudeos.de may get too much traffic and get
> overloaded

Yes, that's why we usually pick mirrors with more bandwidth to handle
or be the ccTLD mirror.


> b) it is against the "idea of mirroring" as the intention is to distribute
> traffic

There are plans and designs being worked out on how better to
distribute the traffic amongst mirrors.


> c) if ubuntu.mirror.tudos.de is offline de.archive.ubuntu.com is offline
>
> shouldn't there be multiple ip's of the country-mirrors behind for example
> de.archive.ubuntu.com

Unfortunately, you cannot have more than one CNAME, it's a violation
of the specifications for DNS. So we're left with one or having a
system to automatically update A/AAAA records for ccTLDs.


Regards,

Haw
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