[gentoo-user] which mirror does emerge --sync chose? and why?

[gentoo-user] which mirror does emerge --sync chose? and why?

[Sven Köhler]

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Hi,

"emerge --sync" should sync with rsync.gentoo.org, to which many IP
adresses (5 at the moment).

Here's what host says:
# host rsync.gentoo.org
rsync.gentoo.org has address 129.79.6.73
rsync.gentoo.org has address 134.68.220.73
rsync.gentoo.org has address 134.68.220.74
rsync.gentoo.org has address 140.211.166.165
rsync.gentoo.org has address 64.127.121.98

The order of the adresses is random, when i rerun the command above. So
i _would_ expect, that "emerge --sync" randomly choses on the the mirrors.

But that is not true, and actually, on all my machines, "emerge --sync"
uses always the 64.x.x.x mirror, and on the machine of a friend, it used
always 129.x.x.x mirror - well, "always" is not true, but i run "emerge
--sync" over and over again, and it did never try to use another one.


So the thing is, that from my friend's DSL-connection, the server
129.x.x.x was unreachable, while the others were reachable. So we had to
change the server manually in /etc/make.conf - but i don't understand,
why "emerge --sync" used the one it was using, and why it didn't switch
to one of the other ones.


Thanks,
  Sven



BTW: Merry Christmas!


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Re: [gentoo-user] which mirror does emerge --sync chose? and why?

[Mick]

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On Sunday 24 December 2006 21:57, Sven Köhler wrote:
> Hi,
>
> "emerge --sync" should sync with rsync.gentoo.org, to which many IP
> adresses (5 at the moment).
>
> Here's what host says:
> # host rsync.gentoo.org
> rsync.gentoo.org has address 129.79.6.73
> rsync.gentoo.org has address 134.68.220.73
> rsync.gentoo.org has address 134.68.220.74
> rsync.gentoo.org has address 140.211.166.165
> rsync.gentoo.org has address 64.127.121.98
>
> The order of the adresses is random, when i rerun the command above. So
> i _would_ expect, that "emerge --sync" randomly choses on the the mirrors.
>
> But that is not true, and actually, on all my machines, "emerge --sync"
> uses always the 64.x.x.x mirror, and on the machine of a friend, it used
> always 129.x.x.x mirror - well, "always" is not true, but i run "emerge
> --sync" over and over again, and it did never try to use another one.
>
> So the thing is, that from my friend's DSL-connection, the server
> 129.x.x.x was unreachable, while the others were reachable. So we had to
> change the server manually in /etc/make.conf - but i don't understand,
> why "emerge --sync" used the one it was using, and why it didn't switch
> to one of the other ones.

I do not understand/know how the choice of mirrors work either.  I noticed 
that when I rsync from home I always hit the same mirror (first time).  When 
I rsync from work (using the same laptop) I always hit a different specific 
mirror (again first time).

> BTW: Merry Christmas!

Merry Christmas to all Gentooists!  :)
-- 
Regards,
Mick

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[gentoo-user] Re: which mirror does emerge --sync chose? and why?

[Sven Köhler]

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> I do not understand/know how the choice of mirrors work either.  I noticed 
> that when I rsync from home I always hit the same mirror (first time).  When 
> I rsync from work (using the same laptop) I always hit a different specific 
> mirror (again first time).

it's not portage!
it's rsync!!!

execute "rsync rsync.gentoo.org::" for a few times. I always see the
banner message of owl.gentoo.org, and no other.

That is STRANGE!



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Re: [gentoo-user] Re: which mirror does emerge --sync chose? and why?

[Dan]

On Tue, 26 Dec 2006 23:50:14 +0100
Sven Köhler <skoehler@upb.de> wrote:

> > I do not understand/know how the choice of mirrors work either.  I
> > noticed that when I rsync from home I always hit the same mirror
> > (first time).  When I rsync from work (using the same laptop) I
> > always hit a different specific mirror (again first time).
> 
> it's not portage!
> it's rsync!!!
> 
> execute "rsync rsync.gentoo.org::" for a few times. I always see the
> banner message of owl.gentoo.org, and no other.
> 
> That is STRANGE!
> 
> 


i think it's not strange at all.  i'm sure rsync uses mechanisms to find
the closest server, and it's no surprise that this would be the same all
the time, and different from the point of view of different networks.

-- 
gentoo-user@gentoo.org mailing list

[gentoo-user] Re: which mirror does emerge --sync chose? and why?

[Sven Köhler]

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>>> I do not understand/know how the choice of mirrors work either.  I
>>> noticed that when I rsync from home I always hit the same mirror
>>> (first time).  When I rsync from work (using the same laptop) I
>>> always hit a different specific mirror (again first time).
>> it's not portage!
>> it's rsync!!!
>>
>> execute "rsync rsync.gentoo.org::" for a few times. I always see the
>> banner message of owl.gentoo.org, and no other.
>>
>> That is STRANGE!
> 
> i think it's not strange at all.  i'm sure rsync uses mechanisms to find
> the closest server, and it's no surprise that this would be the same all
> the time, and different from the point of view of different networks.

Then, rsync behaves kind of stupid, because if rsync always uses the
same server, and the server doesn't work, then the sync will not work.

But rsync could chose a different server, well, the second-best server,
if the best server has failed. But it didn't do that :-(

Well, but any discussion about that would be off-topic.


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Re: [gentoo-user] Re: which mirror does emerge --sync chose? and why?

[Neil Bothwick]

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On Tue, 26 Dec 2006 23:50:14 +0100, Sven Köhler wrote:

> execute "rsync rsync.gentoo.org::" for a few times. I always see the
> banner message of owl.gentoo.org, and no other.
> 
> That is STRANGE!

The resolver is caching the result of looking up rsync.gentoo.org. Until
that expires, which depends on the TTL setting on the DNS server, you
will always get the same IP address for rsync.gentoo.org.


-- 
Neil Bothwick

Captain, I believe there's an energy source in the liver of the cloud.

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