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OCI Instance Migrated From Intel to AMD Shape Does Not Boot Successfully

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edited Nov 17, 2022 1:56PM in Linux

Applies to:  

Oracle Cloud Infrastructure - Version N/A and later 

Linux X86-64


Symptoms 

Ubuntu based 20.04 custom image instance is working correctly using Intel based OCI shapes.

After migrating the instance to an AMD based E3.Flex/E4.Flex shape, the instance is not reachable via SSH.

Boot messages show that a needed network driver module is needed but not available.


Cause 

The custom image used in the instance does not support AMD based shapes.


Solution 

  • In this case the image being used was found to be an appliance for OCSBC (Oracle Communications Session Border Controller).
  • It was seen that after changing the instance properties to Paravirtualized Networking and Paravirtualized Boot  Volume, the instance was able to boot successfully.
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