Linux application skills to reset the root password

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RHEL (CentOS 7) Reset the root password

linux operating system, colleges, school is the network operating system, felt very strange, curious, learning a CentOS 7, beginning to understand its powerful rights management, and real understanding to root (root), I feel like it God, omnipotent, but the reason the middle of other disciplines, set aside half a year, suddenly want to toss down my super powers, found the landing do not go in, making for a ghost, my root actually so bad (forgotten) , then refer to some information, reset the root password, I found very interesting, but why, what does it mean? Persevere to find the cause, then we see a lot of materials to find the reason of them. Read on

First, reboot the system, view system version information

Second, the kernel edit mode, edit the kernel, run rescue mode