In this, we have created two instances (webserver and appserver) of which one has lost its keypair.

We lost our keypair for the appserver Instance.

Step 1: Stop the appserver Instance ( to detach the volume )

Step 2: Detach the appserver instance volume ( Actions — Detach volume)

Step 3: After Detach, Select the same Volume, go to Actions and Attach Volume.

Step 4: Attach the volume to the instance for which we have the key (webserver instance)

Keep the device name as the default (/dev/sdf).

Click → Attach Volume ( Now the appserver’s detached volume is attached to the webserver )

Step 5: Connect the webserver instance and run the following commands.

sudo su
mkdir -p /var/newkey

#To see all the volume connected
lsblk

xvda — root volume , xvdf — attached volume

#Mount the volume to the folder
mount -o nouuid /dev/xvdf1 /var/newkey

The above command is used to mount a filesystem on the device “**/dev/xvdf1*” to the directory “/var/newkey” with the “nouuid” option. nouuid means not to follow the UUID (universally Unique Identifier).*

#overwrite the authorized keys
cp /home/ubuntu/.ssh/authorized_keys /var/newkey/home/ubuntu/.ssh/authorized_keys

The command is copying the “authorized_keys” file from the original “.ssh” directory to a new location under “/var/newkey/home/ubuntu/.ssh/”

#Finally unmount the volume
umount /var/newkey

Step 6: Stop the webserver instance ( to detach the appserver’s volume)

Volume — Detach Volume (appserver instance volume)

Volume — Attach Volume

Select the appserver instance

Rename to → “/dev/xvda” ,which is referred to the root or primary disk of the system

Step 7: Start the webserver and appserver instances.

Now connect the appserver instance with the webserver’s keypair

Congratulations! You have successfully connected to the instance using the key pair you possess.

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