👀 Views: 70 💬 Answers: 1 📅 Created: 2025-08-20

oci python-sdk cloud-computing Python

I've tried everything I can think of but I'm building a feature where I'm trying to attach a block volume to an existing OCI compute instance using the Python SDK, but I keep working with an 'InvalidArgument' behavior... The instance is in a running state, and I have verified that the block volume is in the same availability domain as the instance. Here’s the code snippet I’m using: ```python import oci # Instantiate the compute and volume client compute_client = oci.core.ComputeClient(config) blockstorage_client = oci.core.BlockstorageClient(config) # Retrieve the instance and volume details instance_id = 'your_instance_id' volume_id = 'your_volume_id' try: # Attempt to attach the block volume attach_volume_response = compute_client.attach_volume( instance_id, oci.core.models.AttachVolumeDetails( volume_id=volume_id, attachment_type='iscsi' ) ) print('Volume attached:', attach_volume_response.data) except oci.exceptions.ServiceError as e: print('behavior:', e) ``` When I execute this code, I receive the following behavior message: `ServiceError: InvalidArgument: Invalid argument for attribute 'attachment_type'.` I’ve confirmed that the volume is not already attached to another instance and that the volume ID is correct. Additionally, I’ve double-checked that I have the necessary IAM permissions to attach volumes. I've tried changing the `attachment_type` to both 'iscsi' and 'paravirtualized', but I still get the same behavior. Could the question be related to the specific configuration of the compute instance or the volume? Any help would be appreciated! I'm coming from a different tech stack and learning Python. This is for a CLI tool running on CentOS.