How to reset EC2 server user account password

Steps to Reset the EC2 User Password

Stop the EC2 Instance:

Go to the AWS Management Console.

Navigate to the EC2 Dashboard.

Select the instance you need to reset the password for.

Click on the Instance State drop-down and select Stop.

Detach the Root Volume:

Once the instance is stopped, select the instance.

In the Description tab, note the Root device value (e.g., /dev/sda1).

Go to the Elastic Block Store > Volumes.

Find the root volume attached to your instance (using the Root device value noted).

Select the volume and click Actions > Detach Volume.

Attach the Root Volume to a Temporary Instance:

Launch a temporary EC2 instance in the same availability zone.

Once the instance is running, go back to the Volumes section.

Select the detached root volume and click Actions > Attach Volume.

Attach the volume to the temporary instance, use a different device name (e.g., /dev/sdf).

Modify the Password on the Temporary Instance:

Connect to the temporary instance via SSH using your key pair.

Mount the attached volume:

sudo mkdir /mnt/tempvol
sudo mount /dev/xvdf1 /mnt/tempvol

Change the root to the mounted volume

sudo chroot /mnt/tempvol

Reset the password for the desired user

passwd username

Unmount the Volume and Reattach It:

exit

Unmount the volume

sudo umount /mnt/tempvol

Go back to the AWS Management Console.

Detach the volume from the temporary instance.

Reattach the volume to the original instance as the root volume (/dev/sda1).

Restart the Original Instance:

Go back to the EC2 Dashboard.

Select your original instance.

Click on Instance State and select Start.

Connect to the Original Instance:

Once the instance is running, connect via SSH using your key pair.

Verify that you can log in with the new password.

Connect to Your EC2 Instance via SSH:

Use SSH to connect to your EC2 instance using the SSH key pair you have associated with the instance:

ssh -i /path/to/your/key.pem ec2-user@your-instance-public-dns

Reset the Password:

sudo passwd username

Follow the Prompts:

You will be prompted to enter a new password. Type and confirm the new password as instructed. No need to enter the current password since you are using sudo. Verify the New Password:

Once the password is successfully changed, you can test it by disconnecting from the instance (exit command) and then reconnecting with the new password to ensure it works. Optional: Disable Password Authentication (Recommended for Security):

For improved security, after resetting the password, consider disabling password authentication and using SSH key pairs exclusively for authentication. To do this, edit the SSH daemon configuration file (/etc/ssh/sshd_config) and set PasswordAuthentication no. Then, restart the SSH service (sudo systemctl restart sshd).

Hi

Reset Password using AWS Management Console (if applicable):

This method only works if:

• You have access to the AWS Management Console with IAM user credentials that have administrator access to the EC2 instance.
• You haven't disabled password login for the user (usually ec2-user for Amazon Linux or Ubuntu AMIs).

Here's how to proceed:

• Login to the AWS Management Console.
• Navigate to the EC2 service.
• Select the instance you want to access.
• Click on "Actions" and then select "Instance Settings" -> "Get System Log".
• Look for logs related to password resets. These might contain a temporary password for the user.
• Once you have the temporary password, connect to the EC2 instance using SSH and the temporary password.
• After gaining access, use the passwd command to set a new, strong password for the user.

For More Reset Passwords please follow the link:

https://docs.aws.amazon.com/systems-manager/latest/userguide/managed-instances-password-reset.html