EC2 instance - reachability failed

Hello,

You can create an Amazon Image (AMI) or a EBS Snapshot of your EBS volumes, you don't need access to the OS, you can create the Backup from the AWS EC2 Console Web Page or using the command line (CLI).

Also, if your EC2 is not an Instance Store based you can simple Stop the EC2 and then Start it up, sometimes this simple process remediates the access to your EC2 as long as the issue was with the underlying host or a transitory issue with your OS.

Kind regards.

If you have created a snapshot of the instance before now, you can try recovering from that https://docs.aws.amazon.com/prescriptive-guidance/latest/backup-recovery/restore.html#instance-from-snapshot

If you don't have a snapshot you can try creating one now, and then following the same process to create a new AMI and create a new instance from it (though with the proviso that you are creating a new instance from an image of an instance that is impaired, so don't be surprised if it doesn't work first time and you have to fiddle with things).

Other documentation that may help here:

Creating snapshots https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-creating-snapshot.html

Creating backups with snapshots https://docs.aws.amazon.com/prescriptive-guidance/latest/backup-recovery/new-ebs-volume-backups.html

Creating an AMI https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/creating-an-ami-ebs.html

Backup and recovery with snapshots https://docs.aws.amazon.com/prescriptive-guidance/latest/backup-recovery/ec2-backup.html