CPU spiked and eth0: Failed

Question

I am using t3a.micro ubuntu instance, where in the last 3 months, the same issue has occurred twice. 
The pattern I have seen is, regardless of instance usage CPU suddenly spikes up to 70/80 % stays in the same state for around 3/4 hours. Meanwhile, I get the syslog as eth0: Could not set DHCPv4 address: Connection timed out. and instance status check fails.

We have checked the instance/application usage and it doesn't seem to be a problem. We cannot figure out what is causing the issue. 
Note - A similar issue occurred on a different server as well.

Parthasaradi Challa · Answer

Hello.

To action plan to address the CPU spikes and network issues on your t3a.micro instance please follow below steps it would be resolve.

* **This can resolve temporary issues.** Go to the AWS Management Console, find your instance, and select "Reboot."
* Consider upgrading to a larger instance (EX.t3a.small). This provides more resources to handle CPU spikes.
* Ensure that your security groups and network ACLs allow necessary traffic. Confirm that there are no rules blocking your instance’s network.
* Check the logs in /var/log/syslog for errors related to DHCP and network issues. Look for entries that correlate with the times of the CPU spikes.
* Set up CloudWatch to track CPU usage and network metrics. Look for patterns in usage during spikes.
* Use **top or htop** to identify any processes that might be using CPU resources heavily during spikes.

racitup · Answer

See my answer here, it has likely lost its IP address and needs a network service restart:
https://repost.aws/questions/QUnp_BmYLcRyeTkiSkrGqFvQ

CPU spiked and eth0: Failed

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