How can I troubleshoot and resolve the particular issue of “instance reachability check failed”?

126    Asked by Daminidas in AWS , Asked on Feb 14, 2024

 I am a cloud engineer and I am responsible for troubleshooting the issues related to the connectivity within an AWS environment. While going through the process I received an alert message which is indicating that an “instance reachability check failed” for one of the EC2 Instances in my infrastructure. How can I troubleshoot and resolve this particular issue? 

In the context of AWS, you can troubleshoot and resolve the issue of “Instance reachability check failed”:-

Verifying Instance status

You should start by checking the status of the affected EC2 instances in the management console related to AWS or you can also use the command line interface of AWS:-

 Aws ec2 describe-instance-status –instance-id

Checking system logs

You can try to review the system log of the instance for the task of identifying any underlying issues or even errors:-

Aws ec2 get-console-output –instance-id

Checking security group rules

Try to ensure that the security group that is associated with the Instance allows inbound and outbound traffic necessary for its operations. You can then verify and update the security group rules by using the AWS management console or the command line interface of AWS.

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