EC2 Linux Instance Reachability Check Failed

Hello.

If there is a problem with Instance status check, it may be caused by insufficient OS specifications such as memory or CPU usage, or OS settings.
Please check the document below for troubleshooting instructions.
https://repost.aws/knowledge-center/ec2-linux-status-check-failure

• Failure to boot the operating system (OS)
• Failure to correctly mount the volumes
• Exhausted CPU and memory
• Kernel panic
• Network failure

It may be a good idea to check the EC2 system log by following the steps in the document below.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/troubleshoot-unreachable-instance.html#instance-console-console-output

Hello,

Generally if the instance status check fails, it means there is some issue with the instance configuration or resource crunch. A quick way to overcome this is to perform a reboot and see if the instance comes up. If not have a look at the console logs for any of the errors in the below documentation.

• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstances.html

We reboot the instance and the problem is gone. We will continue monitor the issue and see if it comes back. Thank you for the quick response.