How to reset root password in Linux

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  1. Restart the Linux machine.
  2. At the Grub boot loader, press e.
  3. Locate that line that begins with linux or linux16. If this line contains "rhgb quiet", remove "rhgb quiet". Add init=/bin/bash to the very end of the line. Note: The linux or linux16 information is in the Grub configuration file.
linux16 /vmlinuz-3.10.0-327.10.1.el7.x86_64 
root=/dev/mapper/centos_lxserve01-root ro 
rd.lvm.lv=centos_lxserve01/swap crashkernel=auto 
rd.lvm.lv=centos_lxserve01/root LANG=en_US.UTF-8 init=/bin/bash
  1. Press ctrl x.

 

You should now have a shell prompt.

By default, the / (root) filesystem is mounted with the ro (read only) permissions. The mount command can be used to see this.

bash-4.2# mount | grep -w "/"
/dev/mapper/centos_lv-root on / type xfs (ro, relatime,attr2, inode64)

 

Remount the / (root) filesystem with rw (read write) permissions.

bash-4.2# mount -o remount,rw /

 

Use the mount command again to confirm that the root filesystem now has rw permissions.

bash-4.2# mount | grep -w "/"
/dev/mapper/centos_lv-root on / type xfs (rw, relatime,attr2, inode64)

 

Use the passwd command to reset root's password.

bash-4.2# passwd
New UNIX password: ********
Retype UNIX password: ********

 

Create the hidden file .autorelabel in the / (root) directory to cause SELinux to automatically relabel the context of the / (root) filesystem.

bash-4.2# touch /.autorelabel

 

Ensure the hidden .autorelabel file was created.

bash-4.2# ls -la /

 

Boot the system.

bash-4.2# exec /sbin/init

 



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