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Chaos faults for Azure

Introduction​

Azure faults disrupt the resources running on a Azure cluster. They can be categorized into different types depending on the target resource.

Azure disk loss

Azure disk loss

Azure disk loss detaches the virtual disk from an Azure instance.

disk loss
Azure instance CPU hog

Azure instance CPU hog

Azure instance CPU hog disrupts the state of infrastructure resources. It induces stress on the Azure instance using the Azure `Run` command. The Azure `Run` command is executed using the in-built bash scripts within the fault. It utilizes excess amounts of CPU on the Azure instance using the bash script for a specific duration.

CPU hog
Azure instance IO stress

Azure instance IO stress

Azure instance I/O stress disrupts the state of infra resources. This fault induces stress on the Azure instance using the Azure `Run` command. The Azure `Run` command is executed using the in-built bash scripts within the fault. It causes I/O stress on the Azure Instance using the bash script for a specific duration.

I/O stress
Azure instance memory hog

Azure instance memory hog

Azure instance memory hog disrupts the state of infrastructure resources. It induces stress on the Azure Instance using the Azure `Run` command. The Azure `Run` command is executed using the in-built bash scripts within the fault. It utilizes memory in excess on the Azure Instance using the bash script for a specific duration.

memory hog
Azure instance stop

Azure instance stop

Azure instance stop powers off from an Azure instance for a specific duration. It checks the performance of the application or process running on the instance.

azure
Azure web app access restrict

Azure web app access restrict

Azure web app access restrict causes a split brain condition by restricting the access to an application service instance. This fault checks if the requests have been serviced and recovery is automated after the restrictions have been lifted. It checks the performance of the application (or process) running on the instance.

restrict access

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Azure disk loss​

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Azure disk loss detaches the virtual disk from an Azure instance.

  • After a specific duration, the virtual disk is re-attached to the instance.
  • This fault checks the performance of the application (or process) running on the instance.
Use cases
  • Determines the resilience of an application to unexpected disk detachment.
  • Determines how quickly the Azure instance recovers from such failures.
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Azure instance CPU hog​

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Azure instance CPU hog disrupts the state of infrastructure resources.

  • It induces stress on the Azure instance using the Azure Run command. The Azure Run command is executed using the in-built bash scripts within the fault.
  • It utilizes excess amounts of CPU on the Azure instance using the bash script for a specific duration.
Use cases
  • Determines the resilience of an Azure instance and the application deployed on the instance during unexpected excessive utilization of the CPU resources.
  • Determines how Azure scales the CPU resources to maintain the application when it is under stress.
  • Causes CPU stress on the Azure instance(s).
  • Simulates the situation of lack of CPU for processes running on the application, which degrades their performance.
  • Verifies metrics-based horizontal pod autoscaling.
  • Verifies vertical autoscale, that is, demand based CPU addition.
  • Facilitates the scalability of nodes based on growth beyond budgeted pods.
  • Verifies the autopilot functionality of cloud managed clusters.
  • Verifies multi-tenant load issues. When the load on one container increases, the fault checks for any downtime in other containers.
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[object Object]

Azure instance IO stress​

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Azure instance I/O stress disrupts the state of infra resources.

  • This fault induces stress on the Azure instance using the Azure Run command. The Azure Run command is executed using the in-built bash scripts within the fault.
  • It causes I/O stress on the Azure Instance using the bash script for a specific duration.
Use cases
  • Determines the resilience of an Azure instance when unexpected stress is applied on the I/O sources.
  • Determines how Azure scales the resources to maintain the application under stress.
  • Simulates slower disk operations by the application.
  • Simulates noisy neighbour problems by hogging the disk bandwidth.
  • Verifies the disk performance on increasing I/O threads and varying I/O block sizes.
  • Checks whether or not the application functions under high disk latency conditions.
  • Checks whether or not the application functions under high I/O traffic, and large I/O blocks.
  • Checks if other services monopolize the I/O disks during stress.
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[object Object]

Azure instance memory hog​

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Azure instance memory hog disrupts the state of infrastructure resources.

  • It induces stress on the Azure Instance using the Azure Run command. The Azure Run command is executed using the in-built bash scripts within the fault.
  • It utilizes memory in excess on the Azure Instance using the bash script for a specific duration.
Fault usage
  • Determines the resilience of an Azure instance when memory resources are unexpectedly utilized in excess.
  • Determines how Azure scales the memory to maintain the application when resources are consumed heavily.
  • Simulates the situation of memory leaks in the deployment of microservices.
  • Simulates a slowed application caused by lack of memory.
  • Simulates noisy neighbour problems due to hogging.
  • Verifies pod priority and QoS setting for eviction purposes.
  • Verifies application restarts on OOM (out of memory) kills.
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Azure instance stop​

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Azure instance stop powers off from an Azure instance during a specific duration. It checks the performance of the application or process running on the instance.

Use cases
  • Determines the resilience of an application to unexpected power off of the Azure instances.
  • Determines how the application handles the requests and how quickly it recovers from such failures.
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Azure web app access restrict​

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Azure web app access restrict causes a split brain condition by restricting the access to an application service instance.

  • This fault checks if the requests have been serviced and recovery is automated after the restrictions have been lifted.
  • It checks the performance of the application (or process) running on the instance.
Use cases
Azure web app access restrict determines the resilience of an application when access to a specific application service instance is restricted.
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[object Object]

Azure web app stop​

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Azure web app stop shuts down the application. It checks whether the requests have been re-routed to another instance on the application service.

Use cases
  • Determines the resilience of a web application to unplanned halts (or stops).
  • Determines the resilience based on how quickly and efficiently the application recovers from the failure by re-routing the traffic to a different instance on the same application service.
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