出现如图问题，通过查询，常见问题是
1、修改DNS
2、CentOS-Base.repo源有问题，或者是缺少该文件
3、重新挂载镜像
通过重新挂载镜像，然后再执行
yum clean all
yum makecache
执行结果如下图：
yum makecache时出现file:///mnt/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /mnt/repodata/repomd.xml"
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yum install 报错[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml
yum install 报错[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml
yum install 报错[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml
Couldn't open file /mnt/iso/repodata/repomd.xml
yum install 报错 Couldn't open file /mnt/cdrom/repodata/repomd.xml
redhat 7.6 部署禅道 yum [Errno 14] curl#37 - "Couldn't open file /mnt/repodata/repomd.
Couldn't open file /xxx/repodata/repomd.xml
yum 报错 [Errno 14] Could not open/read file:///media/iso/repodata/repomd.xml
yum的/repodata/repomd.xml的错误浅析
Mongodb安装报错https://repo.mongodb.org/yum/redhat/#releasever/mongodb-org/4.0/x86_64/repodata/repomd.xml: [Errno -1] Error importing repomd.xml for mongodb-org-4.0: Damaged repomd.xml file