安装出错，上传不了文件

linux中lrzsz 报错安装不了
是什么原因啊

 rootac                                Instal
 已加载插件:fastestmirror
 Determining fastest mirrors
 Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was
 One of the configured repositories failed（未知），
 and yum doesn't have enough cached data to continue.At this point the only
      1.Contact theupstream for therepository and get them to fixthe problem.
      2.Reconfigure the baseur1/etc.for the repository，to point to a working
         upstream. This is most often useful if you are using a newer
         packages for the previous distribution release sti11 work）.
      3.Run the command with the repository temporarily disabled
         wi11 then just ignore the repository unti1 you permanently enable it
          againoruse                  -enablerepo for temporary usage:
              yum-config-manager --disable<repoid>
          or
              subscription-managerrepos                                  --disable=<repo1d>
      5.Configure the failing repository to be skipped，if it is unavailable.
         Note that yum wi11 try to contact the repo.whenit runs most commands，
          compromise:
              yum-config-manager--save-                                  -setopt=<repoid>.skip_if_unavailable=true
 annot        f1ng                                         ase///×8662

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