System reachability check passed Instance reachability failed!

Question

Hi,  
  
I rebooted my instance and it's now - "instance unreachable".  
I have tried stopping it and starting but nothing has worked though instance is running with network ip.  
  
On dashboard:  
Instance i-00c2cf7dbb42ddb32  
AMI ID - amazon linux 2 - amzn2-ami-hvm-2.0.20180810-x86_64-gp2 (ami-0cf31d971a3ca20d6)  
Instance state - running  
Status shows (1/2 checks passed):  
_System reachability check passed_   
_Instance reachability check failed._  
My security group has got the following ports open 22, 80,8080,5901 none reachable.  
The system was working fine until reboot / stop-start. Snapshot is still login prompt!   
Network is up. Public ip is up.   
  
Can anyone find what's gone wrong?  
  
Edited by: awsnodeuser on Mar 4, 2019 6:51 AM

Answer

FWIW, this appears to be the problem I ran into:  
https://bugs.launchpad.net/ubuntu/_source/cloud-init/_bug/1802073

Answer

Hi There,  
I checked your instance and saw it was terminated.  
Also, I checked the console logs and saw that the instance was unable to bring up network interface eth0  
I believe there was some config issue with network inside the instance.  
  
In cases on instance level status check failure, it is always requested to check logs inside the instance to get to understand onto what happened. You can refer to more information on the instance check failure as follows:  
        Types of Status Checks: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/monitoring-system-instance-status-check.html#types-of-instance-status-checks  
  
Hope this helped.  
If you have other concerns, reach out to us and we will be happy to help.  
  
Have a nice day !!  
  
Edited by: SatyamSinha-AWS on Mar 4, 2019 11:10 PM

Answer

Thanks for the reply.  
I took the following steps to restore:  
1. Created a snapshot ( under left pane Elastic Block Store )  
2. Stopped the running instance.  
3. In Actions dropdown of Instance clicked on Launch more like this and selected default options  
4. Under left pane Elastic Block Store clicked on Volumes and then Actions dropdown to Create volume.  
5. In Actions dropdown of Instance clicked on Manage IPs then after seeing only private IP is allocated, clicked Allocate an Elastic IP and selected ipv4 amazon pool.  
6. Under Network and Security -> Elastic Ip on left pane associated this new ip to ami id.  
7.Terminated the old instance  
8. Deleted old volume  
9. Retained snapshot  
  
Edited by: awsnodeuser on Mar 4, 2019 11:38 PM  
  
Edited by: awsnodeuser on Mar 4, 2019 11:39 PM

Answer

I'm having the same issue with an Ubuntu 18.04 instance. The only thing that has worked is to stop the instance, then create an AMI from the stopped instance, then launch a new instance. But after shutting the new instance down, the next start has the exact same problem!  
  
Instance i-01168826c4a0b014e  
  
- Tim

System reachability check passed Instance reachability failed!

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