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Re: Yum, Proxy Cache Safety, Storage Backend



Warren Togami wrote:
On Wed, 23 Jan 2008 21:28:01 -0600, Les Mikesell <lesmikesell gmail com>
wrote:
Warren Togami wrote:

Yum and Proxy Caches: Current Dangers
=====================================
Users may be using proxy servers in 3 (or more) ways:
Is there a reasonable way to make yum automatically use files cached in
these local proxies when run by multiple users that share the proxy but
don't know about each other?  Picking some random mirror for each will
defeat the caching since they will have different URLs to get the same
file.

http://fedoraproject.org/wiki/Infrastructure/Mirroring/SiteLocalMirrors
This page needs updating, but it sort of describes what you need to do.

Use your Fedora account to login to MirrorManager and add a private mirror
for yourself along with a site-local netblock in CIDR notation so the
mirror master knows to serve to you when yum clients come from your
network.  After a few hours, mirror lists will serve your mirror first,
then random other mirrors in your country/region.

Interesting, but it still requires custom setup for any distro/version that the proxy admin would want to support. What I'd really like to happen is for yum to just always prefer the same URL when working through the same proxy so caching would work by default without needing to be aware of the cache content. This would work automatically if the target was a single site, RRDNS, or geo-ip managed DNS, but you probably can't arrange that for all the repo mirrors. There has to be some clever way to get the same effect even when using a mirrorlist - like making sure the mirrorlist itself is cached and always picking the same entry so any client will use the same URL that the mirrormanger gave to the first one that made a request. Of course you'd need a reasonable retry mechanism to pick something else if this choice fails but I'd guess it would be a big win in bandwidth use and load on the mirrors if it worked most of the time to take advantage of existing local caches with no modifications.

--
   Les Mikesell
    lesmikesell gmail com



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