Redhat7 cracking (resetting) root password

Crack （ Reset ）root password

Reset the system root The account password is thuctive, Make sure you can use root Sign in .

1. Turn it on （ Or restart ） appear grub Press any key during the menu to terminate the startup process , Edit in memory GRUB Loaded entries ,
After the kernel has just mounted all the file systems , But in handing over control to systemd Before terminating the startup process .

2. Press e Key edit GRUB Current entry , find Linux This business , Press End Key to end of line , take rd.break Append to end of line ,
Then press Ctrl+x Boot system , If there is something selected by the yellow box in the following figure , Please be sure to delete .

3. Reset root password
①mount -o remount,rw /sysroot/
②chroot /sysroot
③echo “thuctive”|passwd --stdin root
④touch /.autorelabel
⑤ exit
⑥exit

And then we'll go into SELinux The interface of automatic re tagging ,
The time depends on the number of system files and the performance of the machine , Be sure to restart after it finishes typing the label .

4. It's over SELinux label , Normal startup to login interface , Use new password thuctive Login successful .