CentOS yum install出現問題，Could not open/read file:///mnt/cdrom/repodata/repomd.xml

[root@host-10-0-0-9 ~]# yum install httpd  Loaded plugins: fastestmirror, security  Loading mirror speeds from cached hostfile  file:///mnt/cdrom/repodata/repomd.xml: [Errno 14] Could not open/read fi

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