EC2 instance Status Check failed and server stopped working

in flag

I am using an AWS EC2 instance (t3.xlarge) running on Ubuntu server 18.04.6 LTS, which was working fine. But suddenly I encountered an error where the instance status check failed "Instance reachability check failed" and I was not able to connect to my instance through ssh and the website attached to this server also stopped working. I don't see any storage or Ram issue during this time.

I had to force stop and start the instance from the AWS EC2 Console to fix this issue.

Later after connecting to the server, I checked the syslog where some of the services were killed as shown in below image around the same time when the instance status check failed.

enter image description here

I would like to know what is the route cause or trigger for this issue and the steps I can take to avoid such issues in the future.

Please comment if more information is required.

Your help in solving this issue is much appreciated.

Thanks in advance.

Edit 1: Adding the output of dmesg -T click here

Abhishek A avatar
cn flag
What is the output of `dmesg -T`?
Surya H avatar
in flag
@AbhishekA thanks for your response, I have edited the question and added the output of dmesg -T
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