> yum update
> Loaded plugins: refresh-packagekit
> Could not retrieve mirrorlist
> http://mirrors.fedoraproject.org/mirrorlist?repo=rawhide&arch=i386
> error was
> [Errno 4] IOError: <urlopen error (-2, 'Name or
> service not known')>
> Error: Cannot retrieve repository metadata (repomd.xml) for
> repository:
> rawhide. Please verify its path and try again


Try again, this time please do a
# yum clean all
# yum clean metadata

then run
# yum update

I encounter this once in a while, but after doing the above at least one time, the updates come in.

It worked after I tried a few more times.  I didn't even do the "yum clean".
The first two times it didn't work.  The third time it did. 

Thanks,
                David