[mirrorbrain] Content Delivery Network is in production

For the last couple of week, we have been working with Peter Pöml to
set up mirrorbrain as the content deliver network for Sugar Labs.
There are a number advantages for using a content delivery network.

1. Usability -  We can  remove the mirror information from
http://wiki.sugarlabs.org/go/Sugar_on_a_Stick/Strawberry#Download_locations
.  All a _user_ has to worry about is the single
http://download.sugarlabs.org location , redirection to individual
mirrors is invisible to the user.

2. Scalability - Rather that increasing the bandwidth or throughput on
a primary sl.org machine we can distribute the load across a system of
mirrors.  Mirrors are a very well understood concept in free software
delivery.  Mirrorbrain is used by both opensuse and open office with
loads 2 orders of magnitutide above Sugar Labs' loads.

3. Locality - Mirrorbrain uses geoip for to determine the physical
location of downloader and mirrors.  Mirrorbrain can determine the
most appropriate mirror for a given download.

Any traffic going through htp://download.sugarlabs.org (including
activity bundles) will be served through the content delivery network.

david

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