yum One of the configured repositories failed..._one of the configured repositories failed (未知), an

运行yum时报错:

One of the configured repositories failed (CentOS-2 - Updates),
 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=updates ...

	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 updates
        or
            subscription-manager repos --disable=updates

     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=updates.skip_if_unavailable=true
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这里的中文意思是：有各一个库（我这里是updates）配置失败了，下面每条给的都是建议，我用的是第三条：跳过这库继续执行，比如你要搜索nginx，本来的命令是：yum list |grep nginx
替换成:yum --disablerepo=updates list |grep nginx
如果还是提示有其他库配置失败了，再加个--disablerepo=xxx即可