I can't connect to my EC2 instance.

Question

I checked the connection after creating the instance, But it seems that at some point something went wrong with the instance.

After restarting the instance, It works fine, but I don't know the cause of the problem.

[Problems]
- Cannot connect using PuTTY
- 'ping' to Elastic IP is not responding
- The state of the instance is RUNNING, but failed to check the status of the instance

[Installed on EC2]
- Docker
- Apache + PHP (Container)
- MySQL (Container)

The CPU usage increased on 04/30/2022 03:00, and the instance status check fails after that. 
And there was no traffic at this time.

I checked the logs, no errors are found.

What more should I check?

Answer

I think you should check the utilization of the instance. Whenever the memory/cpu is full, it is possible to make instances inaccessible (because there is no resource left to serve the request).

I can't connect to my EC2 instance.

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