Centos7 - yum install downloadonly - 저장소에 대한 유효한 기본 URL을 찾을 수 없습니다: centosplus/$releasever/x86_64

virt-viewerCentos 7에 대한 모든 종속성이 포함된 패키지를 다운로드 하려고 합니다 . 대신 yum을 사용합니다Yum 다운로더:

yum install --installroot=/tmp/ --downloadonly --downloaddir virt-viewer virt-viewer

실수:

Loaded plugins: fastestmirror, langpacks


 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: centosplus/$releasever/x86_64

나는 성공하지 못한 채 저장소에서 echo 7 > /etc/yum/vars/releasever주석 처리를 제거하거나 시도하지 않았습니다.baseurletc/yum.repos/

편집: yum update둘 다 yum downloader작동하므로 DNS 확인 중이라고 생각합니다.