VMware Windows Blackhole Chaos

VMware Windows Blackhole Chaos simulates a network blackhole scenario on Windows OS based VMware VM.

• It checks the performance of the application running on the VMware Windows VMs under network blackhole conditions.

Use cases

• VMware Windows Blackhole Chaos determines the resilience of an application when a network blackhole scenario is simulated on a VMware Windows virtual machine.
• VMware Windows Blackhole Chaos simulates the situation of network isolation for processes running on the application, which degrades their performance.
• It also 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.
• Ensure the firewall is active and permissions to modify its rules are granted. Consider using the built-in Administrator user. Learn how to enable it in Windows.
• 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

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 block.	For example, github.com,harness.io. For more information, go to destination hosts.
IP_ADDRESSES	Comma separated list of IP addresses to block.	For example, 10.0.0.1,10.0.0.2. For more information, go to IP addresses.
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 parallel and serial 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 block 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-blackhole-chaos
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # Destination hosts to block
        - name: DESTINATION_HOSTS 
          value: 'github.com'

IP addresses

The IP_ADDRESSES environment variable specifies the IP addresses to block on the target Windows VM.

Use the following example to specify IP addresses:

apiVersion: litmuschaos.io/v1alpha1
kind: ChaosEngine
metadata:
  name: engine-nginx
spec:
  engineState: "active"
  chaosServiceAccount: litmus-admin
  experiments:
  - name: vmware-windows-blackhole-chaos
    spec:
      components:
        env:
        # Name of the VM
        - name: VM_NAME
          value: 'test-vm-01'
       # IP addresses to block
        - name: IP_ADDRESSES 
          value: '10.0.0.1,10.0.0.2'