CDROM 저장소는 캐시를 만들 수 없습니다.

내 CentOS 7.2:

/dev/sr0내 컴퓨터에 가상 CDROM()을 설치 했습니다 /mnt/cdrom.

mount명령을 사용하여 설치 목록을 확인했는데 여기에는 다음 정보가 포함되어 있습니다 .

...
/dev/sr0 on /mnt/cdrom type iso9660 (ro,relatime)
...

하지만 ls /mnt/cdrom내부에 repo 데이터가 있을 때:

[root@localhost cdrom]# ls
CentOS_BuildTag  GPL       LiveOS    RPM-GPG-KEY-CentOS-7
EFI              images    Packages  RPM-GPG-KEY-CentOS-Testing-7
EULA             isolinux  repodata  TRANS.TBL

로컬 저장소를 만들었습니다.

vi /etc/yum.repos.d/redhat_cdrom.repo

여기에 다음 구성을 추가합니다.

[redhat_cdrom]
name=red hat cdrom yum source
baseurl=file:///mnt/cdrom/
gpgcheck=0
enable=1

하지만 yum 저장소를 캐시하면 다음과 같습니다.

[root@localhost cdrom]# yum clean all
[root@localhost cdrom]# yum makecache


Loaded plugins: fastestmirror
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
14: curl#6 - "Could not resolve host: mirrorlist.centos.org; Unknown error"


 One of the configured repositories failed (Unknown),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Disable the repository, so yum won't use it by default. Yum will then
        just ignore the repository until you permanently enable it again or use
        --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>

     4. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64