VMware Windows Service Stop

VMware Windows Service Stop simulates a service stop scenario on Windows OS based VMware VM.

• It checks the performance of the application running on the VMware Windows VMs under service stop conditions.

Use cases

• VMware Windows Service Stop determines the resilience of an application when a service stop scenario is simulated on a VMware Windows virtual machine.
• VMware Windows Service Stop simulates the situation of service stop for services running on the application, which degrades their performance.
• It also helps verify the application's ability to handle service failures and its failover mechanisms.

Prerequisites

• 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.

• Run the fault with a user possessing admin rights, preferably the built-in Administrator, to guarantee permissions for memory stress testing. See how to enable the built-in Administrator in Windows.

• 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

Mandatory tunables

Tunable	Description	Notes
VM_NAME	Name of the target VM.	For example, win-vm-1
VM_USER_NAME	Username of the target VM.	For example, vm-user.
VM_PASSWORD	User password for the target VM.	For example, 1234. Note: You can take the password from secret as well.
SERVICE_NAMES	Comma separated list of service names to stop.	For example, service1,service2. For more information, go to service names.

Optional tunables

Tunable	Description	Notes
FORCE	If set to "enable", the service will be forcefully stopped.	Default: enable. For more information, go to force.
SELF_HEALING_SERVICE	If set to "enable", the service will be restarted after chaos injection.	Default: disable. For more information, go to self-healing service.
TOTAL_CHAOS_DURATION	Duration that you specify, through which chaos is injected into the target resource (in seconds).	Default: 60 s. For more information, go to duration of the chaos.
RAMP_TIME	Period to wait before and after injecting chaos (in seconds).	Default: 0 s. For more information, go to ramp time.
SEQUENCE	Sequence of chaos execution for multiple instances.	Default: parallel. Supports serial and parallel sequence. For more information, go to sequence of chaos execution.
DEFAULT_HEALTH_CHECK	Determines if you wish to run the default health check which is present inside the fault.	Default: 'true'. For more information, go to default health check.

Service names

The SERVICE_NAMES environment variable specifies the service names to stop on the target Windows VM.

Use the following example to specify service names:

apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-service-stop
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # Service names to stop
        - name: SERVICE_NAMES 
          value: 'service1,service2'

Force

The FORCE environment variable specifies whether the service should be forcefully stopped.

Use the following example to enable forceful stopping:

apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-service-stop
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # Enable forceful stopping
        - name: FORCE 
          value: 'enable'

Self-healing service

The SELF_HEALING_SERVICE environment variable specifies whether the service should be restarted after chaos injection.

Use the following example to enable self healing service:

apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-service-stop
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # Enable self healing service
        - name: SELF_HEALING_SERVICE 
          value: 'enable'