[CentOS] Why not use yum mirrorlist= instead of baseurl= in CentOS-Base.repo

William Warren hescominsoon at emmanuelcomputerconsulting.com
Thu Oct 13 22:03:19 UTC 2005


yum falls over when confronted with a transparent squid proxy.

Les Mikesell wrote:
> On Thu, 2005-10-13 at 15:30, Adam Gibson wrote:
> 
>>Currently the default yum configuration references mirror.centos.org. 
>>When yum looks up the IP address it finds several but it will only try 
>>one and fail if that server is down or does not have the headers for 
>>whatever reason.
> 
> 
> If yum were to retry using the alternate IP addresses, this wouldn't
> be an issue.  Windows Internet Explorer manages this trick nicely, so it
> can't be that difficult...
> 
> 
>>If yum were to reference a mirrorlist it would skip servers that fail 
>>and keep trying them all until it finds one that works or exhausts all 
>>the mirrors.  Centos would host a file on their web server for each 
>>repository that has a list of mirror baseurls.
> 
> 
> If you have more than one machine behind a proxy, they will randomly
> pick servers from the mirrorlist and use different URL's, so you
> not only don't save the bandwidth by re-using the cached copy, you
> duplicate the copies in the cache.  (Fedora already does it that
> way).
> 
> 
>>I created a test script to generate mirrorlists from the 
>>mirror.centos.org DNS lookup and changed yum to reference the local 
>>files that were generated as a mirrorlist= and it worked.
> 
> 
> Now run a bunch of machine updates through the same squid proxy
> and see what happens.  How about fixing yum to understand what
> multiple A records in DNS is all about? 
> 

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