Recover Ec2 Key Pair

30.12.2019
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We need to follow the following steps in order to recover the SSH key pair:

Steps:

  1. Launch new ec2 Machine(Recovery Machine)
  2. Stop(ShutDown) the first machine(Web server) and Detach the root volume.
  3. Attach the volume with the recovery machine.
  4. Mount the block device and copy the SSH key contents.
  5. Release the volume from the recovery machine.
  6. Reattach the Volume with the first machine(Web server) and log in with new ssh recovery key.

1. Launch new ec2 Machine

Launch a new ec2 machine as a recovery machine but make sure it should have the same VPC network ID as the Web Server machine.

2. ShutDown the first machine and Detach the root volume

Now you need to stop the first machine (Web Server) so you can detach the root volume, otherwise, you are not allowed to detach the root volume while the machine is in running state. The screenshots below show how to find out associated root volume (a) and how to detach the root volume (b)?
ec2
(a)
ec2-2
(b)

3. Attach the volume with a recovery machine

Now, we have detached the root volume from the Web Server machine. Again from the same location go to the “Actions” showing in the screenshot (b). Attach the volume with Recovery Machine, as shown in the following screenshot(c).
ec2-3
(c)

4. Mount the block device and copy the SSH key contents

SSH to new recovery machine with your new key pair (RecoverKey.pem) and switch to root user from ec2-user. Run the following command to view the block devices and confirm your attached volume in the O/P list. Check my O/P below.

[root@ip-172-31-10-78 ~]# lsblk 
NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
xvda    202:0    0   8G  0 disk 
└─xvda1 202:1    0   8G  0 part /
xvdm    202:192  0   8G  0 disk 
└─xvdm1 202:193  0   8G  0 part    <- New Attached Volume
[root@ip-172-31-10-78 ~]# 

5. Release the volume from the recovery machine

Before using the newly attached volume you have to mount this volume with Recovery machine file structure, Please run the following command:

:~# mount /dev/xvdm1 /mnt 

Now copy the SSH key and unmount the volume from the current file structure.

:~# cat /home/ec2-user/.ssh/authorized_keys > /mnt/home/ec2-user/.ssh/authorized_keys 

:~# umount /dev/xvdm1 /mnt 

6. Reattach the Volume with the first machine and login with a new ssh recovery key

Now detach the volume from the recovery machine and reattach the volume with the “Web Server” machine again, Check the below screenshot.
key pair
Now start the Web Server machine, you would be able to access your web server machine with a new Recovery key.

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