1. Stop the instance that you can’t log in to. 

Stop the instance that you can’t connect to. In the Oracle Cloud Infrastructure Console, go to the details page for the instance and click Stop.

2. Detach the boot volume.

Detach the boot volume. In the Boot Volume section, click the Actions icon and choose Detach. 

3. Attach the boot volume to a running Linux instance.

Attach the boot volume to another Linux instance by going to Block Storage >> Boot Volumes >> Boot Volumes Details.  Click  Attach to Instance in Attached Instances. 

Select the iSCSI, Select Instance and click in Attach

Run the iSCSI commands to attach the device and make it visible to the local operating system.

Your boot-volume should appear as /dev/sdb3.

4. Fix the authorized_keys file.

Make /dev/sdb3, which is the root (/) partition where you can recover the opc SSH key file, available to the local operating system using “mount” command.

sudo mount  /dev/sdb3 /mnt

5. Fix the opc SSH key by editing the /mnt/home/opc/.ssh/authorized_keys file and adding your SSH key public file.

sudo vi /mnt/home/opc/.ssh/authorized_keys

After you add or change the SSH public key you need to use, save, and exit it.

6. Run umount /mnt.

sudo umount /mnt

7. Detach the iSCSI boot volume by running the detach iSCSI commands.

Unmount the device and detach it by running the iSCSI commands

Ensure that the /dev/sdb disk is no longer available or visible through the SSH connection, and then detach it.

Click in Continue Detachment

Click in Detach

8. Reattach the boot volume to the instance where you wanted to recover the SSH key, wait for it to become operational.

Click in Attach Boot Volume

After the boot volume is attached, start the Compute Instance.

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Disclaimer: “The postings on this site are my own and do not necessarily represent my current employer positions, strategies, or opinions. The information here was edited to be useful for general purpose, specific data, and identifications was removed to allow reaching a generic audience and to be useful.”