VMware Windows network loss

VMware Windows network loss simulates a network loss scenario on Windows OS based VMware VM. It checks the performance of the application running on the VMware Windows VMs under network loss conditions.

Use cases

VMware Windows network loss:

• Determines the resilience of an application when a network loss scenario is simulated on a VMware Windows virtual machine.
• Simulates the situation of network loss for processes running on the application, which degrades their performance.
• Helps verify the application's ability to handle network 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.

• Verify clumsy is installed on the VM, as it's essential for this experiment.

• 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 engine 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.

Optional tunables

Tunable	Description	Notes
DESTINATION_HOSTS	Comma-separated list of destination hosts to induce loss.	For example, github.com,harness.io. For more information, go to destination hosts.
DESTINATION_IPS	Comma-separated list of destination IPs to induce loss.	For example, 10.0.0.1,10.0.0.2. For more information, go to destination IPs.
NETWORK_PACKET_LOSS_PERCENTAGE	Percentage of network packets to lose.	Default: 100. For more information, go to network packet loss percentage.
PATH_OF_CLUMSY	Path of the Clumsy tool in the VM.	For example, C:\Program Files\Clumsy\. For more information, go to path of Clumsy.
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.

Destination hosts

The DESTINATION_HOSTS environment variable specifies the destination hosts to induce loss on the target Windows VM.

Use the following example to specify destination hosts:

apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-network-loss
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # Destination hosts to induce loss
        - name: DESTINATION_HOSTS
          value: 'github.com'

Destination IPs

The DESTINATION_IPS environment variable specifies the destination IPs to induce loss on the target Windows VM.

Use the following example to specify destination IPs:

apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-network-loss
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # Destination IPs to induce loss
        - name: DESTINATION_IPS
          value: '10.0.0.1,10.0.0.2'

Network packet loss percentage

The NETWORK_PACKET_LOSS_PERCENTAGE environment variable specifies the percentage of network packets to lose.

Use the following example to specify network packet loss percentage:

apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-network-loss
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # Percentage of network packets to lose
        - name: NETWORK_PACKET_LOSS_PERCENTAGE
          value: '100'

Path of Clumsy

The PATH_OF_CLUMSY environment variable specifies the path of the Clumsy tool in the VM.

Use the following example to specify the path of Clumsy:

apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-network-loss
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # Path of the Clumsy tool in the VM
        - name: PATH_OF_CLUMSY
          value: 'C:\\Program Files\\Clumsy\\'