On centos 5 yum is complaining with the error:
debroglie/primary_db | 64 kB 00:00
http://centos.debroglie.net/RPMS/5/repodata/primary.sqlite.bz2: [Errno -3] Error performing checksum
The server is now on centos 6 and createrepo is using a hash that centos 5 does not understand by default. I fixed the problem now (createrepo -d -s sha1). If you still have an error try: “yum clean all” first.