document/TranslateProject
2
0
Fork 0
mirror of https://github.com/LCTT/TranslateProject.git synced 2025-02-25 00:50:15 +08:00
Code Issues Packages Projects Releases Wiki Activity

20170211-10 选题

Browse Source
This commit is contained in:
Ezio 2017-02-11 15:49:38 +08:00 committed by GitHub
parent b853387719
commit 6fcb79ad1a
1 changed files with 104 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

104
sources/tech/20160908 How to reset the root password in RHEL7CentOS7Scientific Linux 7- based systems.md Normal file
View File

@ -0,0 +1,104 @@
### How to reset the root password in RHEL7/CentOS7/Scientific Linux 7- based systems
Contents
* * [1. Objective][9]
* [2. Requirements][10]
* [3. Difficulty][11]
* [4. Instructions][12]
* [4.1. Boot into the minimal mode][1]
* [4.2. Interrupt the boot process][2]
* [4.3. Remount the system so that it can read and write][3]
* [4.4. Make /sysroot your root][4]
* [4.5. Change the root password][5]
* [4.6. Load SELinux policy][6]
* [4.7. Set context type on /etc/shadow file][7]
* [4.8. Exit & reboot][8]
### Objective
Resetting the root password in RHEL7/CentOS7/Scientific Linux 7
### Requirements
RHEL7 / CentOS7 / Scientific Linux 7
### Difficulty
MODERATE
### Instructions
Things have changed in the RHEL7 world and so has the preferred way of resetting the root password. Although the old way of interrupting the boot process (init=/bin/bash) still works, it is no longer bulletproof and recommended. 'Systemd' uses 'rd.break' to interrupt the boot. Let's have a quick walk through the whole procedure. 
### Boot into the minimal mode
Reboot the system and press `e` while being on the kernel list page, before the autoboot starts the system automatically. You get into the edit mode.
### Interrupt the boot process
In the kernel string - at the end of the line starting `linux 16 /vmlinuz- ect` type `rd.break`. Then Ctrl+X to reboot. The system boots into the initial ram drive and it's mounted on /sysroot In this mode you are not required to type the password.
### Remount the system so that it can read and write
```
switch_root:/# mount -o remount,rw /sysroot/
```
### Make /sysroot your root
```
switch_root:/# chroot /sysroot
```
The command line will change slightly.
### Change the root password
```
sh-4.2# passwd
```
### Load SELinux policy
```
sh-4.2# load_policy -i
```
### Set context type on /etc/shadow file
```
sh-4.2# chcon -t shadow_t /etc/shadow
```
Note: You could bypass the last 2 steps by creating an autorelabel file instead, but autorelabeling might take a long time.
```
sh-4.2# touch /.autorelabel
```
For that reason, and despite it is easier, it should be regarded as the 'lazy option', and is not recommended.
### Exit & reboot
Exit & reboot and log in with your new root password.
--------------------------------------------------------------------------------
via: https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems
作者：[Rado Folwarczny][a]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
[a]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems
[1]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-1-boot-into-the-minimal-mode
[2]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-2-interrupt-the-boot-process
[3]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-3-remount-the-system-so-that-it-can-read-and-write
[4]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-4-make-sysroot-your-root
[5]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-5-change-the-root-password
[6]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-6-load-selinux-policy
[7]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-7-set-context-type-on-etc-shadow-file
[8]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-8-exit-reboot
[9]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h1-objective
[10]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h2-requirements
[11]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h3-difficulty
[12]:https://linuxconfig.org/how-to-reset-the-root-password-in-rhel7-centos7-scientific-linux-7-based-systems#h4-instructions