当尝试yum update在 Centos6上使用时，我收到此错误：“错误：找不到 repo 的有效 baseurl：centos-sclo-rh。” 有什么办法可以摆脱这种错误状态吗？
[root@4206-yv3 ~]$ yum update
Loaded plugins: fastestmirror
Setting up Update Process
Determining fastest mirrors
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
Could not retrieve mirrorlist http://mirrorlist.centos.org?arch=x86_64&release=6&repo=sclo-rh error was
14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"
Error: Cannot find a valid baseurl for repo: centos-sclo-rh
[root@4206-yv3 ~]$
centos ×1