Oracle linux root password

The Oracle DBA’s

since you have created instance on oracle cloud, it requires you private .ppk key file to login

from putty you can login on your instance by directly providing that private key.

and on Linux/Unix defult user is «opc».

since during creation of instance it will not ask you for root password.

You dont need any password to connect to root.

to connect to root type below command as opc user.

[opc@sts ~]$ sudo su
[root@sts opc]#

by this you will login as root.

Now change your password

[root@sts opc]# passwd
Changing password for user root.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
[root@sts opc]#

Thanks & Regards
Nikhil Kumar.

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1. Reboot Linux. When boot menu appears, press a key to stop it from booting any further. You should see something like this:
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5. Type “ /usr/sbin/reboot –f ” to reboot.
6. After waiting a few minutes for the reboot to finish, you should be able to log in as root with your new password!

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How to reset Root user password from boot on Oracle Linux 8.5

To Reset Root Password From Boot On Oracle Linux 8.5

Introduction:

Grub is the boot menu. It allows you to choose between multiple operating systems if you have more than one installed. Additionally, Grub can be used for troubleshooting. It can be used to modify boot arguments or to boot from an older kernel. In this tutorial, I’ll show you how to reset the root password in Oracle Linux 8.5.

Procedure:

Step 1: Restart the linux machine by using the below command

Step 2: While turning on the power button, at the grub boot menu press the

“e” key to edit the first boot entry as shown in the below image 

Step 3: From the grub options, go to the line that starts with “ linux” as shown in the below image

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Step 5: Now the initrampfs prompt with a root shell will appear at this stage, the root file system is mounted in read only mode to /sysroot and it must be remounted with read/write (rw) permission, so enter “ mount -o remount,rw /sysroot” as shown in the below image

Step 6: once the file system is remounted, change it to chroot jail so that /sysroot is used as the root of the file system.this can be done by running “ chroot /sysroot”

From here the root password can be reset with “ passwd” command as shown in the below image 

Step 7: Now we can reboot but, as centos 7 uses SELINUX enforcing mode by default we have to fix the context of the /etc/shadow file so create “ touch /.autorelabel” as shown in the below image

Step 8: Now Select Not listed and Enter username as root and Enter the password as shown in the below image

Conclusion:

We have reached the end of this article. In this guide, we have walked you through the steps required to reset root password from boot on oracle linux 8.5 on Oracle Linux 8.5. Your feedback is much welcome.

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