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Testing the Instana Agent Operator with Kind

One of the main features of the instana-agent-operator is to do leader election. In order to test this manually, we need a Kubernetes cluster where we can destroy nodes, so that we can observe if a new leader is elected in that case.

This page describes how to set up a local Kubernetes cluster with Kind and test the instana-agent-operator in that cluster.

Kind (Kubernetes in Docker) will set up a local cluster where all nodes and the master run in Docker containers.

Set up a local Kubernetes Cluster with Kind

Install kind (a single executable that can be downloaded from the Github release page) and run the following commands to create the cluster:

./e2e-testing/with-kind/create-cluster.sh

You should see a cluster with one control-pane and two worker nodes up and running.

This script will also do the following:

  • Build the instana/instana-agent-operator Docker image locally and load it into the local Kind cluster
  • Pull the latest instana/agent Docker image locally and load it into the local Kind cluster

Install the Operator

Follow the steps described in Install Operator Manually.

Instead of using the instana-agent-operator.yaml file directly from the latest GitHub release, download that latest instana-agent-operator.yaml file locally, and change the imagePullPolicy for the Deployment from Always to IfNotPresent. This will ensure that it uses the locally built instana/instana-agent-operator image.

Expected result

kubectl -n instana-agent get pods

This should show one instance of the instana-agent-operator (see the number of replicas configured in olm/operator-resources/instana-agent-operator.yaml), and two instances of instana-agent (one on each worker node in the cluster).

Delete a node

Delete one of the worker nodes that is running the instana-agent leader pod. The operator should reassign leadership to another agent pod. You should see the reassignment if you tail the logs for the operator pod.

Clean up

./e2e-testing/with-kind/delete-cluster.sh