[CentOS] Starting a Local CentOS Mirror

Jason Pyeron jpyeron at pdinc.us
Thu Jun 26 22:09:26 UTC 2008

> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Art Age Software
> Sent: Thursday, June 26, 2008 6:03 PM
> To: centos at centos.org
> Subject: [CentOS] Starting a Local CentOS Mirror
> Hi all,
> I would like to set up a local CentOS mirror, as suggested by 
> others on this list, to cut down on bandwidth usage, etc. I 
> have read a couple HowTos and it seems pretty 
> straight-forward, but I do have some questions.
> 1) How should I change my entries in /etc/yum.repos.d? 
> Specifically, should I replace CentOS-Base.repo with my own 
> .repo file?

I don't like fidling with files that are provided by rpms, so we use a local DNS
override on the mirrors.centos.org, et al

Then we provide yum & up2date with the mirror list to choose from (1 entry our
local mirror)

> 2) Is there a way to configure yum to prefer the local repo, 
> but use an external mirror if the local is not available?

See above and update your returned list based on prefences.

> 3) What is the best practice around keeping the local repo 
> updated? A once-a-day cron job to rsync from an external 
> mirror? 

Every ~17 hours I think we do it. We also use locks to prevent more than one
from running at a time. If it fails it will try again, and delay 2x and try
again, repeat...

> If this is the correct approach, is there a way to 
> rsync from a "mirror list" so that updates won't fail if a 
> particular mirror happens to be unavailable when the cron job runs?

Hmm, don't know, might be a good idea.

> Thanks in advance for any guidance you can provide. I want to 
> be sure I get this right!

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