I had an EC2 instance with an EBS root volume attached. I detached the volume and terminated the instance. Then I created a new instance (different instance type, same AMI - Deep Learning Ubuntu 18.04). Now I'm trying to attach this old volume to this new instance as a root volume.
Although it seems pretty straightforward e.g. like in this question, it doesn't work for me.
When I use /dev/sda1 device for attaching the instance boots but I cannot ssh to it ending with port 22: connection refused although the port 22 was allowed when launching the instance.
When I use /dev/sda I end up with not being able to attach the volume (Not a valid device name).
I tried /dev/xvda but the instance won't start saying missing root volume.
I also tried reassigning elastic IP address after attaching the new volume. No change.
Does anyone have any other suggestion about what to try? I was thinking about maybe there is not ssh daemon running in this volume but how can I start it if I cannot connect to the machine. So maybe something else to try?
