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Delegate-Driven Agentless Fault Injection

This topic describes how you can use a Harness Delegate along with an agentless chaos execution model to execute a chaos fault on Kubernetes.

Before you begin, review the following:​

Install Delegate in your Infrastructure​

Step 1: Set up your target cluster​

a. In this step, set up your cluster (where Harness CE executes chaos experiments) with a dedicated namespace for Harness, and go to Centralized Delegate to perform the following steps.

  • Create a dedicated Namespace.
  • Create a service account in the dedicated namespace.
  • Create K8s RBACs and Role binding for Chaos runner pods.
  • Create a cluster role and cluster role binding for conducting service discovery and executing chaos experiments.
  • Create a K8s connector with cluster URL and service account token as authentication method.
  • Create an Infrastructure using the K8s connector.

Step 2: Set Up a Discovery agent​

b. Create a Discovery Agent.

Step 3: Harness Discovers Services​

The discovery agent may take some time to discover the microservices in your Kubernetes cluster.

If the microservices in your system are communicating with each other, the agent will discover the connectivity between these microservices. Otherwise, no connectivity is discovered.

However, you can manually create network experiments and tag them to the relevant application map.

c. Once the services are discovered, the output appears similar to this.

services discovered

Step 4: Create Application Map​

d. Create an application map from the discovery agent.

Step 5: Harness Auto-Creates Experiments​

e. Go to Application Map in Project Settings, and select the application map that you created earlier. It would look similar to the image below.

output

f. In the above screen, click Chaos Experiments and choose one of OnlyFew, Moderate and Maximum to auto-create experiments. These options describes the number of chaos experiments that would be automatically created.

options

g. Based on the option you select, Harness auto-creates the experiments for each discovered service that was selected in the application map. Refresh the page to see the auto-created experiments.

auto-create

Troubleshooting​