Read-only File System Error in Linux

I was moving the content of CentOS boot drive to a new hard drive. CentOS has MBR partition with xfs file system. It worked great, boot fine, but when I tried to do yum install, it barked that it can't do the install because the file system is read-only.

After a decent amount of research, I found out that the problem lies on the /etc/fstab. Because it is new hard drive, the UUID is different and grub2-mkconfig used the new UUID to configure the grub.cfg. However, when it is booted, it checked the /etc/fstab and found the discrepancy. Once I changed the /etc/fstab to reflect the new UUID, the error went away.

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