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EC2 SOA

Links: 114 AWS SOA Index

Enhanced Networking

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- If you want enhanced networking for lower latency then look for ENA and if you have an HPC cluster then look for EFA. - Enhanced networking is not supported in t2.micro but it is supported in t3.micro (newer generation) - So to leverage enhanced networking we have to leverage newer generation of EC2 instances.

Termination Protection

  • How should the instance react when the shutdown is done from OS.
    • Stops (default)
    • Terminate: CLI attribute is InstanceInitiatedShutdownBehavior
  • The default shutdown behaviour can be changed when creating an EC2 in the advanced section.
    • If it is set to terminate then the EC2 instance will terminate when we issue a shutdown from OS.
    • attachments/Pasted image 20230302090522.jpg
  • This is not applicable when shutting down from AWS console. It only stops the instances.
  • We can enable termination protection (DisableApiTermination) to protect against accidental termination from AWS console or CLI.
    • We CANNOT enable termination protection for spot instances.
We have an instance where shutdown behaviour = terminate and enable terminate protection is ticked. If we shutdown the instance from the OS, what will happen?

The instance will still be terminated since we terminated it from the OS and not the console or CLI. DOUBT: I thought the default behaviour was to be stopped.

Miscellaneous

  • We can change instance type of a running instances ONLY IF they are EBS backed.
    • We first stop the instance, change the instance type and then start the instance.
    • AWS moves it to a new hardware but the instance ID remains the same.
  • If your instance is in an Auto Scaling group, the Amazon EC2 Auto Scaling service marks the stopped instance as unhealthy, and may terminate it and launch a replacement instance.
    • To prevent this, you can suspend the scaling processes for the group while you're resizing your instance.

Last updated: 2023-03-24