[Osmf-talk] Encouraging the expansion of GeoDNS enabled tile serving?

Joseph Reeves iknowjoseph at gmail.com
Thu Nov 15 15:19:10 UTC 2012


Great, thanks, that all makes much more sense now. Looking forward to
seeing more caches coming online.

Joseph


On 15 November 2012 13:42, Tom Hughes <tom at compton.nu> wrote:

> On 15/11/12 13:28, Joseph Reeves wrote:
>
>  > What sort of documentation? You seem to have already found most of
>> > the relevant stuff.
>>
>> Ok, I didn't know if there was any additional technical documentation or
>> any more usage stats available. Presumably the DNS bit is pretty
>> straightforward, and members of the CDN just mirror the original OSM
>> database.
>>
>
> There's no mirroring as such - the servers just run squid with the primary
> tile server as the upstream server.
>
>
>  I would be interested in how a user's tileserver is determined, however;
>> if I'm physically halfway between Sjöbo and Brisbane is my tileserver
>> decided by a calculated round-trip time to a server, or does it rely on
>> a simple rule such as "you're in India, so your tiles come from Sweeden"?
>>
>
> Basically it is determined by this script:
>
>   http://git.openstreetmap.org/**dns.git/blob/HEAD:/bin/mkgeo<http://git.openstreetmap.org/dns.git/blob/HEAD:/bin/mkgeo>
>
> based on the rules we specify:
>
>   http://git.openstreetmap.org/**dns.git/blob/HEAD:/src/tile.**
> openstreetmap<http://git.openstreetmap.org/dns.git/blob/HEAD:/src/tile.openstreetmap>
>
> So we can restrict a server to only serve specific countries no matter
> what, as we have for example with the Brisbane server.
>
> All else being equal the final determinant is distance.
>
>
> Tom
>
> --
> Tom Hughes (tom at compton.nu)
> http://compton.nu/
>
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