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+[#]: collector: (lujun9972)
+[#]: translator: ( )
+[#]: reviewer: ( )
+[#]: publisher: ( )
+[#]: url: ( )
+[#]: subject: (Three Ways To Reset And Change Forgotten Root Password on RHEL 7/CentOS 7 Systems)
+[#]: via: (https://www.2daygeek.com/linux-reset-change-forgotten-root-password-in-rhel-7-centos-7/)
+[#]: author: (Prakash Subramanian https://www.2daygeek.com/author/prakash/)
+
+Three Ways To Reset And Change Forgotten Root Password on RHEL 7/CentOS 7 Systems
+======
+
+If you are forget to remember your root password for RHEL 7 and CentOS 7 systems and want to reset the forgotten root password?
+
+If so, don’t worry we are here to help you out on this.
+
+Navigate to the following link if you want to **[reset forgotten root password on RHEL 6/CentOS 6][1]**.
+
+This is generally happens when you use different password in vast environment or if you are not maintaining the proper inventory.
+
+Whatever it is. No issues, we will help you through this article.
+
+It can be done in many ways but we are going to show you the best three methods which we tried many times for our clients.
+
+In Linux servers there are three different users are available. These are, Normal User, System User and Super User.
+
+As everyone knows the Root user is known as super user in Linux and Administrator is in Windows.
+
+We can’t perform any major activity without root password so, make sure you should have the right root password when you perform any major tasks.
+
+If you don’t know or don’t have it, try to reset using one of the below method.
+
+  * Reset Forgotten Root Password By Booting into Single User Mode using `rd.break`
+  * Reset Forgotten Root Password By Booting into Single User Mode using `init=/bin/bash`
+  * Reset Forgotten Root Password By Booting into Rescue Mode
+
+
+
+### Method-1: Reset Forgotten Root Password By Booting into Single User Mode
+
+Just follow the below procedure to reset the forgotten root password in RHEL 7/CentOS 7 systems.
+
+To do so, reboot your system and follow the instructions carefully.
+
+**`Step-1:`** Reboot your system and interrupt at the boot menu by hitting **`e`** key to modify the kernel arguments.
+![][3]
+
+**`Step-2:`** In the GRUB options, find `linux16` word and add the `rd.break` word in the end of the file then press `Ctrl+x` or `F10` to boot into single user mode.
+![][4]
+
+**`Step-3:`** At this point of time, your root filesystem will be mounted in Read only (RO) mode to /sysroot. Run the below command to confirm this.
+
+```
+# mount | grep root
+```
+
+![][5]
+
+**`Step-4:`** Based on the above output, i can say that i’m in single user mode and my root file system is mounted in read only mode.
+
+It won’t allow you to make any changes on your system until you mount the root filesystem with Read and write (RW) mode to /sysroot. To do so, use the following command.
+
+```
+# mount -o remount,rw /sysroot
+```
+
+![][6]
+
+**`Step-5:`** Currently your file systems are mounted as a temporary partition. Now, your command prompt shows **switch_root:/#**.
+
+Run the following command to get into a chroot jail so that /sysroot is used as the root of the file system.
+
+```
+# chroot /sysroot
+```
+
+![][7]
+
+**`Step-6:`** Now you can able to reset the root password with help of `passwd` command.
+
+```
+# echo "CentOS7$#123" | passwd --stdin root
+```
+
+![][8]
+
+**`Step-7:`** By default CentOS 7/RHEL 7 use SELinux in enforcing mode, so create a following hidden file which will automatically perform a relabel of all files on next boot.
+
+It allow us to fix the context of the **/etc/shadow** file.
+
+```
+# touch /.autorelabel
+```
+
+![][9]
+
+**`Step-8:`** Issue `exit` twice to exit from the chroot jail environment and reboot the system.
+![][10]
+
+**`Step-9:`** Now you can login to your system with your new password.
+![][11]
+
+### Method-2: Reset Forgotten Root Password By Booting into Single User Mode
+
+Alternatively we can use the below procedure to reset the forgotten root password in RHEL 7/CentOS 7 systems.
+
+**`Step-1:`** Reboot your system and interrupt at the boot menu by hitting **`e`** key to modify the kernel arguments.
+![][3]
+
+**`Step-2:`** In the GRUB options, find `rhgb quiet` word and replace with the `init=/bin/bash` or `init=/bin/sh` word then press `Ctrl+x` or `F10` to boot into single user mode.
+
+Screenshot for **`init=/bin/bash`**.
+![][12]
+
+Screenshot for **`init=/bin/sh`**.
+![][13]
+
+**`Step-3:`** At this point of time, your root system will be mounted in Read only mode to /. Run the below command to confirm this.
+
+```
+# mount | grep root
+```
+
+![][14]
+
+**`Step-4:`** Based on the above ouput, i can say that i’m in single user mode and my root file system is mounted in read only (RO) mode.
+
+It won’t allow you to make any changes on your system until you mount the root file system with Read and write (RW) mode. To do so, use the following command.
+
+```
+# mount -o remount,rw /
+```
+
+![][15]
+
+**`Step-5:`** Now you can able to reset the root password with help of `passwd` command.
+
+```
+# echo "RHEL7$#123" | passwd --stdin root
+```
+
+![][16]
+
+**`Step-6:`** By default CentOS 7/RHEL 7 use SELinux in enforcing mode, so create a following hidden file which will automatically perform a relabel of all files on next boot.
+
+It allow us to fix the context of the **/etc/shadow** file.
+
+```
+# touch /.autorelabel
+```
+
+![][17]
+
+**`Step-7:`** Finally `Reboot` the system.
+
+```
+# exec /sbin/init 6
+```
+
+![][18]
+
+**`Step-9:`** Now you can login to your system with your new password.
+![][11]
+
+### Method-3: Reset Forgotten Root Password By Booting into Rescue Mode
+
+Alternatively, we can reset the forgotten Root password for RHEL 7 and CentOS 7 systems using Rescue mode.
+
+**`Step-1:`** Insert the bootable media through USB or DVD drive which is compatible for you and reboot your system. It will take to you to the below screen.
+
+Hit `Troubleshooting` to launch the `Rescue` mode.
+![][19]
+
+**`Step-2:`** Choose `Rescue a CentOS system` and hit `Enter` button.
+![][20]
+
+**`Step-3:`** Here choose `1` and the rescue environment will now attempt to find your Linux installation and mount it under the directory `/mnt/sysimage`.
+![][21]
+
+**`Step-4:`** Simple hit `Enter` to get a shell.
+![][22]
+
+**`Step-5:`** Run the following command to get into a chroot jail so that /mnt/sysimage is used as the root of the file system.
+
+```
+# chroot /mnt/sysimage
+```
+
+![][23]
+
+**`Step-6:`** Now you can able to reset the root password with help of **passwd** command.
+
+```
+# echo "RHEL7$#123" | passwd --stdin root
+```
+
+![][24]
+
+**`Step-7:`** By default CentOS 7/RHEL 7 use SELinux in enforcing mode, so create a following hidden file which will automatically perform a relabel of all files on next boot.
+It allow us to fix the context of the /etc/shadow file.
+
+```
+# touch /.autorelabel
+```
+
+![][25]
+
+**`Step-8:`** Remove the bootable media then initiate the reboot.
+
+**`Step-9:`** Issue `exit` twice to exit from the chroot jail environment and reboot the system.
+![][26]
+
+**`Step-10:`** Now you can login to your system with your new password.
+![][11]
+
+--------------------------------------------------------------------------------
+
+via: https://www.2daygeek.com/linux-reset-change-forgotten-root-password-in-rhel-7-centos-7/
+
+作者：[Prakash Subramanian][a]
+选题：[lujun9972][b]
+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://www.2daygeek.com/author/prakash/
+[b]: https://github.com/lujun9972
+[1]: https://www.2daygeek.com/linux-reset-change-forgotten-root-password-in-rhel-6-centos-6/
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