You can certainly attach a new EBS boot volume to an EBS-backed instance.
You can certainly attach a new EBS boot volume to an EBS-backed instance: Stop the instance (NOT terminate). Snapshot its' boot volume. Create a new volume from the snapshot.
Detach the original boot volume, and attach your new one. Start the instance. However, in your case, you don't know why the instance failed, so how do you know that a new boot volume created from a snapshot of the failed one will work?
Did you try rebooting the instance? It sounds as though the OS might have panicked/bluescreened (you don't mention which OS is installed) or possibly just the SSH session daemon died, in which case a simple reboot might be all that is needed.
Thanks for the answer. Rebooted the instance and it worked. But by that time, we launched a new instance after building from scratch which took 4 hrs, and I deleted the old instance.
OS is Ubuntu. We will follow what you suggested in the future. Many thanks.
– Manoj Ranaweera Aug 22 at 18:42 Glad to help. Please accept my answer if it met your requirement, as this improves both of our reputations on the site. – Jonners Aug 23 at 8:54.
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