1. Create a new instance
2. Detach the volume from the old instance
3. Attach the volume to the new instance (/dev/sdf)
4. Change the passwd of ec2-user on the new instance
passwd ec2-user
5. Copy the encrypted password of ec2-user
cat /etc/shadow
6. Mount the old instance’s volume
mkdir /mnt/ebs mount /dev/sdf /mnt/ebs
7. Change the password of the old instance
chmod 777 /mnt/ebs/etc/shadow vim /mnt/ebs/etc/shadow chmod 000 /mnt/ebs/etc/shadow
8. Stop the new instance
9. Detach the old volume from the new instance and then attach it to the old instance (/dev/sda1)
10. Terminate the new instance