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VMware Windows CPU hog

VMware Windows CPU hog applies stress on the CPU resources on Windows OS based VMware VM.

  • It checks the performance of the application running on the VMware Windows VMs.

VMware Windows Cpu Hog

Use cases​

  • VMware Windows CPU hog determines the resilience of an application when stress is applied on the CPU resources of a VMware Windows virtual machine.
  • VMware Windows CPU hog simulates the situation of lack of CPU for processes running on the application, which degrades their performance.
  • It also helps verify metrics-based horizontal pod autoscaling as well as vertical autoscale, that is, demand based CPU addition.
  • It verifies the autopilot functionality of cloud managed clusters.
note
  • Kubernetes > 1.16 is required to execute this fault.
  • Execution plane should be connected to vCenter and host vCenter on port 443.
  • VMware tool should be installed on the target VM with remote execution enabled.
  • Adequate vCenter permissions should be provided to access the hosts and the VMs.
  • The VM should be in a healthy state before and after injecting chaos.
  • Kubernetes secret has to be created that has the Vcenter credentials in the CHAOS_NAMESPACE.
  • VM credentials can be passed as secrets or as a chaos enginer environment variable. 
apiVersion: v1
kind: Secret
metadata:
  name: vcenter-secret
  namespace: litmus
type: Opaque
stringData:
    VCENTERSERVER: XXXXXXXXXXX
    VCENTERUSER: XXXXXXXXXXXXX
    VCENTERPASS: XXXXXXXXXXXXX

Fault tunables​

Mandatory fields

Variables Description Notes
VM_NAME Name of the target VM. For example, ubuntu-vm-1

Optional fields

Variables Description Notes
CPU_CORES Number of CPU cores subject to CPU stress. Default: 0. Indicates that all the avaialble CPU resources are consumed. For more information, go to CPU cores.
TOTAL_CHAOS_DURATION Duration that you specify, through which chaos is injected into the target resource (in seconds). Default: 60s. For more information, go to duration of the chaos.
RAMP_TIME Period to wait before and after injecting chaos (in seconds). For example, 30s. For more information, go to ramp time.
SEQUENCE Sequence of chaos execution for multiple instances. Default: parallel. Supports serial sequence as well. For more information, go to sequence of chaos execution.

CPU cores​

The CPU_CORE environment variable applies stress on the target Windows VM for a specific duration. If the variable is set to 0, the fault consumes all the available CPU resources.

Use the following example to specify CPU cores:

# CPU hog in the VMware VM
apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-cpu-hog
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # CPU cores for stress
        - name: CPU_CORES 
          value: '1'