AWS instance intermittently unresponsive behavior

Question

I am running a Debian 12 instance on EC2 & it constantly stops responding after a couple of minutes. I cannot SSH into it or get console access & the only way to access it again is to reboot it. The instance is supposed to be running 3CX which it does with no issue & it reported no installation problems. The whole setup is standard with default values.

Riku_Kobayashi · Accepted Answer

Hello.

If the EC2 instance setup is the default, the instance type will be a small size such as "t2.micro".  
If this happens, the CPU and memory will be considerably smaller, which may result in unstable operation depending on the application being run.  
https://aws.amazon.com/ec2/instance-types/?nc1=h_ls

I recommend checking the system log to see if any errors are output.  
Also, consider moving to a larger instance type in some cases.

ZedSD · Answer

Upgrading to t2.small solved the issue. It was probably a memory requirement I suspect since using more available memory will revert to swap space & that will likely be limited in the case of a virtual machine due to it falling back to yet more memory on the host required to perform the operation -- which won't happen on AWS it seems as this appears to be a hard limit in my experience. Logs included no information about this for the same reason as above. It would be nice if AWS would just advertise this directly instead of having instances fail cryptically with no notification.

AWS instance intermittently unresponsive behavior

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