Simulate GCP Faults

This document describes how to use Chaos Mesh to inject faults into GCP Pod. Chaos Dashboard and YAML files are provided to create GCPChaos experiments.

GCPChaos introduction

GCPChaos is a fault type in Chaos Mesh. By creating a GCPChaos experiment, you can simulate fault scenarios of the specified GCP instance. Currently, GCPChaos supports the following fault types:

• Node Stop: stops the specified GCP instance.
• Node Reset: reboots the specified GCP instance.
• Disk Loss: uninstalls the storage volume from the specified GCP instance.

Secret file

To easily connect to the GCP cluster, you can create a Kubernetes Secret file to store the authentication information in advance.

Below is a sample secret file:

apiVersion: v1
kind: Secret
metadata:
  name: cloud-key-secret
  namespace: chaos-testing
type: Opaque
stringData:
  service_account: your-gcp-service-account-base64-encode

• name defines the name of kubernetes secret.
• namespace defines the namespace of kubernetes secret.
• service_account stores the service account key of your GCP cluster. Remember to complete Base64 encoding for your GCP service account key. To learn more about service account key, see Creating and managing service account keys.

Create experiments using Chaos Dashboard

note

Before you create an experiment using Chaos Dashboard, make sure the following requirements are met:

1. Chaos Dashboard is installed.

2. Chaos Dashboard can be accessed using kubectl port-forward command:

   kubectl port-forward -n chaos-testing svc/chaos-dashboard 2333:2333

   Then you can access the dashboard via http://localhost:2333 in your browser.

1. Open Chaos Dashboard, and click NEW EXPERIMENT on the page to create a new experiment:

   

2. In the Choose a Target area, choose GCP fault and select a specific behavior, such as STOP NODE:

   

3. Fill out the experiment information, and specify the experiment scope and the scheduled experiment duration:

   

   

4. Submit the experiment information.

Create experiments using YAML file

A node-stop configuration example

1. Write the experiment configuration to the gcpchaos-node-stop.yaml， as shown below:

   apiVersion: chaos-mesh.org/v1alpha1
   kind: GCPChaos
   metadata:
     name: node-stop-example
     namespace: chaos-testing
   spec:
     action: node-stop
     secretName: 'cloud-key-secret'
     project: 'your-project-id-id'
     zone: 'your-zone'
     instance: 'your-instance-name'
     duration: '5m'

   Based on this configuration example, Chaos Mesh will inject the node-stop fault into the specified GCP instance so that the GCP instance will be unavailable in 5 minutes.

   For more information about stopping GCP instances, refer to Stop GCP instance.

2. After the configuration file is prepared, use kubectl to create an experiment:

   kubectl apply -f gcpchaos-node-stop.yaml

A node-reset configuration example

1. Write the experiment configuration to the gcpchaos-node-reset.yaml, as shown below:

   apiVersion: chaos-mesh.org/v1alpha1
   kind: GCPChaos
   metadata:
     name: node-reset-example
     namespace: chaos-testing
   spec:
     action: node-reset
     secretName: 'cloud-key-secret'
     project: 'your-project-id'
     zone: 'your-zone'
     instance: 'your-instance-name'
     duration: '5m'

   Based on this configuration example, Chaos Mesh will inject node-reset fault into the specified GCP instance so that the GCP instance will be reset.

   For more information about resetting GCP instances, refer to Resetting a GCP instance.

2. After the configuration file is prepared, use kubectl to create an experiment:

   kubectl apply -f gcpchaos-node-reset.yaml

A disk-loss configuration example

1. Write the experiment configuration to the gcpchaos-disk-loss.yaml, as shown below:

   apiVersion: chaos-mesh.org/v1alpha1
   kind: GCPChaos
   metadata:
     name: disk-loss-example
     namespace: chaos-testing
   spec:
     action: disk-loss
     secretName: 'cloud-key-secret'
     project: 'your-project-id'
     zone: 'your-zone'
     instance: 'your-instance-name'
     deviceNames: ['disk-name']
     duration: '5m'

   Based on this configuration example, Chaos Mesh will inject a disk-loss fault into the specified GCP instance so that the GCP instance is detached from the specified storage volume within 5 minutes.

   For more information about detaching GCP instances, refer to Detach GCP storage.

2. After the configuration file is prepared, use kubectl to create an experiment:

   kubectl apply -f gcpchaos-disk-loss.yaml

Field description

The following table shows the fields in the YAML configuration file.

Parameter	Type	Descpription	Default value	Required	Example
action	string	Indicates the specific type of faults. The available fault types include node-stop, node-reset, and disk-loss.	node-stop	Yes	node-stop
mode	string	Indicates the mode of the experiment. The mode options include one (selecting a Pod at random), all (selecting all eligible Pods), fixed (selecting a specified number of eligible Pods), fixed-percent (selecting a specified percentage of the eligible Pods), and random-max-percent (selecting the maximum percentage of the eligible Pods).	None	Yes	one
value	string	Provides parameters for the mode configuration, depending on mode. For example, when mode is set to fixed-percent, value specifies the percentage of pods.	None	No	1
secretName	string	Indicates the name of the Kubernetes secret that stores the GCP authentication information.	None	No	cloud-key-secret
project	string	Indicates the ID of GCP project.	None	Yes	real-testing-project
zone	string	Indicates the region of GCP instance.	None	Yes	us-central1-a
instance	string	Indicates the name of GCP instance.	None	Yes	gke-xxx-cluster--default-pool-xxx-yyy
deviceNames	[]string	This is a required field when the action is disk-loss. This field specifies the machine disk ID.	None	no	["your-disk-id"]
duration	string	Indicates the duration of the experiment.	None	Yes	30s