[root@apocalypse ~]# yum update
Setting up Update Process
Setting up repositories
Cannot open/read repomd.xml file for repository: kbs-CentOS-Extras
failure: repodata/repomd.xml from kbs-CentOS-Extras: [Errno 256] No more mirrors to try.
Error: failure: repodata/repomd.xml from kbs-CentOS-Extras: [Errno 256] No more mirrors to try.