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df -h|grep sr0umount dev/sr0echo "/dev/sr0 /mnt iso9660 defaults 0 0" >> /etc/fstabcat/etc/yum.repos.d/rhel7.repo[rhel7-source]name=rhel7-sourcebaseurl=file:///mntenabled=1pgpcheck=0tty 控制台终端pts
umount /dev/sr01、 固定的可以联网IP地址 systemctl status NetworkManager systemctl restart NetworkManager ifconfig nmtui-
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