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controller-runtime Deployment Controller

  • Integrate controller-runtime into project.

  • Add deployment controller that runs business logic on each reconcile event for Deployments in specified namespace.

  • Controller is started alongside the FastHTTP server.

What it does:

  • Uses controller-runtime's manager to run a controller for Deployments.
  • Adds OTEL environment variables to the deployment and creates OTEL collector ConfigMap object. Deployment MUST have label set: app=nodejs

Usage

  1. To compile controller, run:
make build
  1. To start server, run
./k8s-controller --log-level trace --kubeconfig ~/.kube/config server --namespace <namespace> --labelSelectors labelName=labelValue

  1. Create a new deployment or modify existing one by setting app=nodejs label set.

    • E.g.: create a new deployment.
    kubectl create deploy nodejs-app --image=<image> --replicas=1 --labels=app=nodejs -n <namespace>
    • E.g.: Add required label set app=nodejs to existing deployment.
    kubectl label deployment test app=nodejs -n <namespace>

  2. Verify specified namespace, and observe newly added environment variables and annotations for OTEL automatic instrumentation to the deployment and new ConfigMap object done by controller's business logic.

kubectl describe deploy <name> -n <namespace>
kubectl get cm -n <namespace>