[root@ks-server ~]# cd /etc/yum.repos.d/[root@ks-server yum.repos.d]# ls

CentOS-Base.repo       CentOS-Media.repo

CentOS-CR.repo         CentOS-Sources.repo

CentOS-Debuginfo.repo  CentOS-Vault.repo

CentOS-fasttrack.repo

[root@ks-server yum.repos.d]# mkdir bak

[root@ks-server yum.repos.d]# ls

bak                    CentOS-fasttrack.repo

CentOS-Base.repo       CentOS-Media.repo

CentOS-CR.repo         CentOS-Sources.repo

CentOS-Debuginfo.repo  CentOS-Vault.repo

[root@ks-server yum.repos.d]# mv *.repo bak/

[root@ks-server yum.repos.d]# ls

bak

[root@ks-server yum.repos.d]# mount /dev/sr0 /mnt

mount: /dev/sr0 is write-protected, mounting read-only

[root@ks-server yum.repos.d]# ls /mnt

CentOS_BuildTag  LiveOS

EFI              Packages

EULA             repodata

GPL              RPM-GPG-KEY-CentOS-

images           RPM-GPG-KEY-CentOS-Testing-

isolinux         TRANS.TBL

[root@ks-server yum.repos.d]# cat local.repo

[localrepo]

name=localrepo

baseurl=file:///mnt

gpgcheck=

enabled=

[root@ks-server yum.repos.d]# yum clean all

Loaded plugins: fastestmirror, langpacks

Cleaning repos: localrepo

Cleaning up everything

Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned data from disabled or removed repos

Cleaning up list of fastest mirrors

[root@ks-server yum.repos.d]# yum repolist

Loaded plugins: fastestmirror, langpacks

Determining fastest mirrors

localrepo               | 3.6 kB     :

(/): localrepo/group_gz |  kB   :

(/): localrepo/primary_ | 3.1 MB   :

repo id             repo name            status

localrepo           localrepo            ,

repolist: ,