fix: Update virtual_machine.py example #2376
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phoracek
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WalkthroughThe changes modify the process of creating and managing a Virtual Machine (VM) in the example. The context manager approach for VM instantiation has been replaced with a direct assignment to a variable Changes
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🧹 Nitpick comments (1)
examples/virtual_machine.py (1)
6-38: Consider adding error handling and documentation.While the example is much improved, consider enhancing it further with:
- Error handling for potential failures during VM operations
- Comments explaining key configuration options
- Making hardcoded values like VM name and namespace more generic or explaining their significance
-# Define a VM +# Define a VM with a basic CirrOS image and minimal resources vm = VirtualMachine( name="vm-example5", namespace="phoracek", body={ "spec": { - "runStrategy": "Halted", + "runStrategy": "Halted", # Start in halted state to allow explicit start "template": { "spec": { "domain": { "devices": { "disks": [{"name": "disk0", "disk": {"bus": "virtio"}}] }, "resources": {"requests": {"memory": "64Mi"}}, }, "volumes": [ { "name": "disk0", "containerDisk": { "image": "kubevirt/cirros-container-disk-demo" }, } ], }, }, } }, ) # VM operations -vm.create() -vm.start() -vm.vmi.wait_until_running(timeout=180) +try: + vm.create() + vm.start() + vm.vmi.wait_until_running(timeout=180) + # Example continues with stop operation +except Exception as e: + print(f"Error during VM operations: {e}") + # Cleanup resources if needed
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🔇 Additional comments (3)
examples/virtual_machine.py (3)
1-5: Good addition of Kubernetes configuration loading.Adding the explicit import and loading of Kubernetes configuration is a good practice as it ensures the example works correctly by having proper access to the cluster. This makes the example more self-contained and functional.
6-33: Excellent improvement to VM definition with detailed specification.The new approach of directly instantiating the VM with a detailed specification using the
bodyparameter is much clearer and more instructive than the previous context manager approach. This provides a complete example of VM configuration including:
- Run strategy configuration
- Domain specification with devices and resources
- Volume configuration with container disk image
This makes the example much more valuable for users trying to understand how to properly configure VMs.
36-38: Good explicit VM lifecycle management.The explicit calls to
create(),start(), and waiting for the VM to be running with a timeout provide a clear demonstration of VM lifecycle management. This approach is more transparent than using a context manager and shows users the exact sequence of operations required.
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🧹 Nitpick comments (1)
examples/virtual_machine.py (1)
1-40: Consider adding error handling and cleanup.While the example effectively demonstrates VM creation and basic operations, it could be further improved with:
- Error handling for potential failures during VM creation or operations
- Cleanup code to delete the VM after the example completes
- Additional comments explaining key configuration choices
from kubernetes import config from ocp_resources.virtual_machine import VirtualMachine +import time config.load_kube_config() # Define a VM vm = VirtualMachine( name="vm-example", namespace="namespace-example", body={ "spec": { "runStrategy": "Halted", "template": { "spec": { "domain": { "devices": { "disks": [{"name": "disk0", "disk": {"bus": "virtio"}}] }, "resources": {"requests": {"memory": "64Mi"}}, }, "volumes": [ { "name": "disk0", "containerDisk": { "image": "kubevirt/cirros-container-disk-demo" }, } ], }, }, } }, ) # VM operations +try: vm.create() vm.start() vm.vmi.wait_until_running(timeout=180) -vm.stop() + vm.stop() + + # Your additional operations with the VM would go here + + # Uncomment to clean up the VM + # print("Cleaning up VM...") + # vm.delete() + # vm.wait_for_delete() +except Exception as e: + print(f"An error occurred: {e}") +finally: + # Ensure VM is stopped even if an exception occurs + if vm.exists: + vm.stop()
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🔇 Additional comments (3)
examples/virtual_machine.py (3)
1-5: Configuration setup improves example usability.Adding the explicit Kubernetes configuration loading makes the example self-contained and immediately executable for users. This is an essential improvement for demonstration purposes.
6-33: Clear VM definition with comprehensive configuration.The direct VM instantiation with a detailed body parameter provides a more explicit and practical example than the previous context manager approach. The configuration includes all essential elements for a functional VM:
- Appropriate runStrategy
- Domain configuration with device specifications
- Resource requirements
- Container disk volume definition
This approach makes it easier for users to understand the required structure and adapt it to their needs.
36-38: VM lifecycle operations are now explicit and robust.The explicit calls to
create()andstart()followed by waiting for the VM to be running provide a clearer demonstration of VM lifecycle management than the previous approach. The timeout value of 180 seconds is reasonable for this example.
phoracek
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/retest conventional-title |
The original example did not work. This patch replaces it with one that does, using the body attribute to provide a clear self-contained example. Signed-off-by: Petr Horacek <phoracek@redhat.com>
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🧹 Nitpick comments (1)
examples/virtual_machine.py (1)
32-35: Consider adding cleanup example for completeness.While the example now effectively demonstrates creating, starting, and stopping a VM, it might be beneficial to also show how to clean up resources by deleting the VM when done.
vm.create() vm.start() vm.vmi.wait_until_running(timeout=180) vm.stop() + +# Clean up resources when done +vm.delete() +vm.wait_until_deleted()
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🔇 Additional comments (3)
examples/virtual_machine.py (3)
1-5: Good addition of explicit Kubernetes configuration.The addition of
config.load_kube_config()is essential for a functional example as it ensures the Kubernetes client is properly configured before attempting to interact with the cluster.
6-29: Well-structured VM definition with comprehensive body parameter.The detailed
bodyparameter effectively demonstrates how to configure a VM with proper specifications including:
- Run strategy set to "Halted" (VM won't start automatically upon creation)
- Domain specifications with device configuration
- Resource requirements for memory
- Volume definitions using a container disk image
This provides a much clearer, functional example compared to the previous implementation.
32-34: Clear demonstration of VM lifecycle operations.The explicit calls to
create(),start(), and waiting for the VM instance to be running provide a clear, step-by-step demonstration of the VM lifecycle management, which is more instructive than the previous context manager approach.
Short description:
The original example did not work. This patch replaces it with one that does, using the body attribute to provide a clear self-contained example.
More details:
What this PR does / why we need it:
Old example does not work, this one does.
Which issue(s) this PR fixes:
Special notes for reviewer:
Bug:
Summary by CodeRabbit
New Features
Refactor