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yum makecache生成缓存时报错One of the configured ...

执行操作：

yum makecache

报错内容：

Loading mirror speeds from cached hostfile
 * base: mirror.lzu.edu.cn
 * extras: mirror.lzu.edu.cn
 * updates: mirror.lzu.edu.cn
centos/filelists_db            FAILED                                          
file:///mnt/repodata/ce678501a07f940dbe16d3e4fcb495050fd48ec429c5e8ea955e681594f90934-filelists.sqlite.bz2: [Errno 14] curl#37 - "Couldnt open file /mnt/repodata/ce678501a07f940dbe16d3e4fcb495050fd48ec429c5e8ea955e681594f90934-filelists.sqlite.bz2"
正在尝试其它镜像。
centos/other_db                FAILED                                          
file:///mnt/repodata/281832be789b989fe8c543f9de47992c0b1de080a4c7f7971a587cfa64d58f86-other.sqlite.bz2: [Errno 14] curl#37 - "Couldnt open file /mnt/repodata/281832be789b989fe8c543f9de47992c0b1de080a4c7f7971a587cfa64d58f86-other.sqlite.bz2"
正在尝试其它镜像。
file:///mnt/repodata/ce678501a07f940dbe16d3e4fcb495050fd48ec429c5e8ea955e681594f90934-filelists.sqlite.bz2: [Errno 14] curl#37 - "Couldnt open file /mnt/repodata/ce678501a07f940dbe16d3e4fcb495050fd48ec429c5e8ea955e681594f90934-filelists.sqlite.bz2"
正在尝试其它镜像。


 One of the configured repositories failed (this is centos.repo),
 and yum doesnt 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=centos ...

     4. Disable the repository permanently, so yum wont 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 centos
        or
            subscription-manager repos --disable=centos

     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=centos.skip_if_unavailable=true

failure: repodata/ce678501a07f940dbe16d3e4fcb495050fd48ec429c5e8ea955e681594f90934-filelists.sqlite.bz2 from centos: [Errno 256] No more mirrors to try.
file:///mnt/repodata/ce678501a07f940dbe16d3e4fcb495050fd48ec429c5e8ea955e681594f90934-filelists.sqlite.bz2: [Errno 14] curl#37 - "Couldnt open file /mnt/repodata/ce678501a07f940dbe16d3e4fcb495050fd48ec429c5e8ea955e681594f90934-filelists.sqlite.bz2"

解决方案：

ping网络没有问题

ping www.baidu.com
PING www.a.shifen.com (220.181.38.150) 56(84) bytes of data.
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=1 ttl=50 time=21.3 ms
64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=2 ttl=50 time=21.8 ms
^C

查看是不是yum源问题

vim /etc/yum.repos.d/centos.repo

yum源已配置没有问题 ，若未配置则需创建centos.repo

查看sro是否挂载

df -h

挂载失败，手动挂载

mount /dev/cdrom /mnt

再次测试，问题解决

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