Thanks for the comments. I had /var directory that contained files from an
old Fedora 7 installation and I think that yum did read the $release
variable, as well as package information, from some file in /var. I fixed
the problem the easy way and reinstalled the whole system (with having a
clean /var directory). Now everything works perfectly.
I should had figured this out before posting to the mailing-list, sorry.

Sami

On Sat, Apr 25, 2009 at 8:10 PM, D Tucny <d...@tucny.com> wrote:

> 2009/4/26 Sam Piippo <sampii...@gmail.com>
>
> After installing clean Centos 5.3 and updating with "yum update" yum starts
>> to fail. I get the following error message
>>
>>
>> YumRepo Error: All mirror URLs are not using ftp, http[s] or file.
>>  Eg. 7 is not a valid release or hasnt been released yet/
>> removing mirrorlist with no valid mirrors:
>> //var/cache/yum/base/mirrorlist.txt
>>
>> It looks like the $releasever variable has value 7. Why does this happen
>> and how do I fix this?
>>
>
> Check that distroverpkg in /etc/yum.conf is redhat-release, if it is, check
> that centos-release is the only package providing redhat-release by running
> rpm -q --whatprovides redhat-release, you should see
>
> centos-release-5-3.el5.centos.1
>
> which shows a single package and the version is 5, this is what yum uses to
> determine releasever... Do you have another package installed that also
> provides redhat-release?
>
> d
>
>
>
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