Linux system root user forgot password solution

Linux system root user forgot password solution

First, centos6 root user forgot password solution

1 , Grub unencrypted (known grub password) root password recovery method:

(1) Restart the system, press any key at the system wait time to enter a display interface

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Figure A

(2) Press "E" key in the interface shown in figure one to enter the two interface

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Figure II

(3) Select the second item in the interface shown in Figure two, and press "E" to enter the interface shown in Figure three.

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Might

(4) In the interface shown in figure three quite after adding the parameters of single or number 1, press ENTER to return to the interface shown in Figure two, select the second item, press "B" into the system, at this time, enter the system does not need a password, enter the system input passwd directly for the root user set password, four shows, After setting the password restart.

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Figure Four

Second, centos7 root user forgot password solution

1 , in the Boot Grub menu interface, press "E" to enter the editing interface, shown in five

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Figure Five

2 Press "↓" to find the penultimate row ro (six), change the RO to RW init=/sysroot/bin/sh, and then press CTRL+X to start the system to enter single user mode

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Figure Six

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Figure Seven

3 , enter Chroot/sysroot as shown in single-user mode eight, and then use the passwd root command to make the password more

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Figure Eight

4 , if you have previously enabled SELinux, you must run touch/.autorelabel, as shown in nine otherwise, the system is not functioning properly, and rebooting the system after the operation is complete.

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Figure Nine

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Linux system root user forgot password solution