wrong logic behind country mirror url's ?

[Mike Burgener]

Hi all,

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

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

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

kind regards

Mike



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[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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