LNMP安装失败，求大神帮忙解答解答，该如何处理

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已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
file:///mnt/cdrom/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /mnt/cdrom/repodata/repomd.xml"
正在尝试其它镜像。


One of the configured repositories failed (CentOS-7 - Media),
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. Run the command with the repository temporarily disabled
            yum --disablerepo=c7-media ...

     4. Disable the repository permanently, 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 c7-media
        or
            subscription-manager repos --disable=c7-media

     5. 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=c7-media.skip_if_unavailable=true

failure: repodata/repomd.xml from c7-media: [Errno 256] No more mirrors to try.

安装要求上就明确说明了必须要设置网络源或者完整的本地源，源都不能正常工作是装不了的