centos7 password reset two kinds of way

entos7 / rhel7 single-user mode and reset passwords manner changed greatly, GRUB b by the guide into a guiding ctrl + x.

There are major rd.break and reset the password init in two ways.

rd.break method:

1, when activated, the interface is started, the respective start, kernel name by "e";

2, after entering, to find a place linux16 beginning, press "end" key to finally enter rd.break, press ctrl + x to enter;

3, the command input into the mount, to find the root / sysroot /, and not write, only ro = readonly authority;

4, mount -o remount, rw / sysroot /, remount, then mount, have found that r, w authority;

5, chroot / sysroot / change the root;

(1) echo "123" | passwd -stdin root change the root password to 123, or enter the passwd root, interactive modification;

(2) There is a first cp, then modify / etc / shadow file

6, touch /.autorelabel sentence is to take effect selinux

7, ctrl + d exit

8, then reboot

So far, password changes are complete

The second method

init method:

1. Start the system, and the screen display at start GRUB2 press e to enter edit mode.

2. In linux16 / linux / linuxefi add the following parameters where the end of the line: init = / bin / sh, and ro to the RW (Step 4 thus omitted)

3. Press Ctrl + x to boot shell.

4. Mount the file system as writable mode: mount -o remount, rw /

5. Run passwd, follow the prompts to change the root password. Or perform echo "123" | passwd root --stdin (123 is the password, you can set yourself)

6. How to enable the system before the selinux, you must run the following command, otherwise the system will not boot properly: touch /.autorelabel (the middle with spaces)

7. Run the command exec / sbin / init to start normally.