What is the difference between single user mode and rescue mode in CentOS?

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Rescue mode is typically running off of a ramdisk with fewer commands available. It’s not a full copy of your installed OS; it boots cleanly so that you can trust the utilities. That could be from a DVD, USB device, or from a different grub menu from a known good kernel + initrd image. Most likely it’s...
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Rescue mode is typically running off of a ramdisk with fewer commands available. It’s not a full copy of your installed OS; it boots cleanly so that you can trust the utilities. That could be from a DVD, USB device, or from a different grub menu from a known good kernel + initrd image. Most likely it’s from a boot disk. You use this when something is so messed up that you can’t get the OS to boot at all. Single user mode boots from your normal installation but skips all of the things that make the OS boot into multiuser. So, no X, no network services to speak of (like nfsd or samba), potentially no network connectivity at all. You’ll have access to the full suite of utilities, all filesystems, drivers, and can manually start any applications. You’d typically use this for filesystem corruption on critical mount points, forgotten passwords you need to break, or problems with graphical drivers that cause X not to start correctly. Full link: https://www.quora.com/What-is-the-difference-between-single-user-mode-and-rescue-mode-in-CentOS read less
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