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T3 is a Nitro-based instance type, T2 is not https://docs.aws.amazon.com/ec2/latest/instancetypes/ec2-nitro-instances.html#nitro-instance-types
I think it would be advisable to read the knowledge document Why is my Linux instance not booting after I changed its type to a Nitro-based instance type? and follow the recommended steps.
This also a good third-party explainer https://www.continuent.com/resources/blog/how-convert-aws-instance-family-t2-t3-enhanced-networking-amazon-linux-1
Also, when the instance is up and 2/2 checks passed and you're not able to SSH into it, are you able to connect using AWS Systems Manager Session Manager? https://docs.aws.amazon.com/systems-manager/latest/userguide/session-manager-prerequisites.html
Hi, Please check the below steps and share the status if it doesn't work properly.
- Please check the inbound ssh port, 22, is opened properly.
- Check the DNS is solved at the client.
$ dig <EC2 endpoint>
- EC2 is deployed in a public subnet.
Hi,
Some other folks had similar issues in the past and fixed them: https://repost.aws/questions/QUG_Q2Tu0cQemkhTMoISVLtQ/convert-a-t2-instance-to-t3
Best,
Didier
Thanks for all the assistance! It appears the issue was related to an EBS volume. I had created and attached an EBS volume to the instance when it was a t2 instance, where the volume was mounted as /dev/xvdf. However, when changing the instance type to t3, the device name for the EBS volume changed, causing the fstab to fail and the instance to enter emergency mode.
Hello Hyp,
Thank you for your assistance and response.
I have checked all the suggestions you provided, and everything appears to be working correctly. Moreover, I also considered that there might be an issue with the SSH client on the machine. To test this, I attempted to connect via the 'Serial Console' and 'Instance Connect' methods, but both attempts failed.