出現如圖問題，通過查詢，常見問題是
1、修改DNS
2、CentOS-Base.repo源有問題，或者是缺少該文件
3、重新掛載鏡像
通過重新掛載鏡像，然后再執行
yum clean all
yum makecache
執行結果如下圖：
yum makecache時出現file:///mnt/repodata/repomd.xml: [Errno 14] curl#37 - "Couldn't open file /mnt/repodata/repomd.xml"
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yum install 報錯[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml
yum install 報錯[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml
yum install 報錯[Errno 14] curl#37 - Couldn't open file /mnt/repodata/repomd.xml
Couldn't open file /mnt/iso/repodata/repomd.xml
yum install 報錯 Couldn't open file /mnt/cdrom/repodata/repomd.xml
redhat 7.6 部署禪道 yum [Errno 14] curl#37 - "Couldn't open file /mnt/repodata/repomd.
Couldn't open file /xxx/repodata/repomd.xml
yum 報錯 [Errno 14] Could not open/read file:///media/iso/repodata/repomd.xml
yum的/repodata/repomd.xml的錯誤淺析
Mongodb安裝報錯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