REDHAT7 Single-User mode change Password

REDHAT7 uses GRUB2, which differs from Redhat6.x's approach to single-user access.

First, the Init method

1, Centos7 GRUB2 interface will have two entrances, normal system entrance and rescue mode;

2. Modify GRUB2 Boot

Press "E" on the normal system entrance, will enter the edit mode, search for the RO line, start with linux16;

Change RO to RW; (read-only change to writable)

Remove RHGB quiet (quiet mode no code line swish go, can delete)

Add init=/bin/sh; (or init=/bin/bash, specify shell environment)

Press Ctrl+x to start the system.

3. Change the root password

#passwd #修改密码

#touch/.autorelabel #据说是selinux在重启后更新label

#exec/sbin/init #正常启动init进程

Second, Rd.break method

1, start the time, in the Start screen, the corresponding startup item, the kernel name on the "E";

2, enter, find linux16 beginning place, press "End" key to the last, enter Rd.break, press ctrl+x enter;

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3, enter after the command mount, found root for/sysroot/, and can not write, only ro=readonly permission;

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4, Mount-o remount,rw/sysroot/, re-mount, after Mount, found R,W permission;

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5, chroot/sysroot/change the root;

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The prompt becomes sh-4.2#

(1) Echo Redhat|passwd–stdin root change root password for redhat, or input passwd, interactive modification;

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(2) There is a CP first copy, and then modify the/etc/shadow file

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Online said for SELinux to take effect also need to implement #touch/.autorelabel, measured found not to execute this sentence can also.

6, Ctrl+d exit chroot status.

7. Then execute the #reboot command to restart the server.

REDHAT7 Single-User mode change Password