1. Using kubernetes nats with telemetry.istio.io

    TypeScript

    If you're looking to use NATS with Istio's telemetry on a Kubernetes cluster, you will need to do several things:

    1. Set up a Kubernetes cluster with Istio installed, configured to collect telemetry data.
    2. Deploy NATS onto the Kubernetes cluster as an application that runs within the Istio service mesh.
    3. Configure Istio to capture telemetry data from NATS.

    Here is an example of how you can accomplish this using Pulumi with TypeScript:

    import * as k8s from '@pulumi/kubernetes'; // Istio must be installed and running on the Kubernetes cluster. // This usually involves applying several configuration manifests for Istio CRDs, namespace creation, control plane services, // and auto-injection setup. // Assume that Istio is already installed and setup for automatic sidecar injection in the `nats` namespace. // Create a new kubernetes provider for the existing cluster where Istio is installed. const provider = new k8s.Provider('k8s-provider', { // kubeconfig can be sourced from the KUBECONFIG environment variable, or set explicitly. kubeconfig: process.env.KUBECONFIG, }); // Deploy NATS using the Helm Chart within the scope of the Istio service mesh. // Enabling Istio's auto-injection on the namespace or individual pods is crucial for this step. const natsChart = new k8s.helm.v3.Chart('nats', { chart: 'nats', version: '0.7.x', // replace with the desired version fetchOpts: { repo: 'https://nats-io.github.io/k8s/helm/charts/', }, // Namespace must have istio-injection=enabled namespace: 'nats', values: { // Custom NATS values or configurations can be provided here. }, }, { provider }); // Once NATS is up and running, you'll need to establish metrics collection for Istio telemetry. // In this example, it's assumed that the default metrics configuration is sufficient. // If not, you would need to create a ServiceMonitor or PodMonitor resource according to your scraping tool (like Prometheus), // which is beyond the scope of this example. // Export the NATS service URL for use in your applications. export const natsUrl = natsChart.getResourceProperty('v1/Service', 'nats', 'status').apply(status => { const port = status.loadBalancer.ingress[0].port; const ip = status.loadBalancer.ingress[0].ip; return `nats://${ip}:${port}`; });

    Explanation

    • We import the @pulumi/kubernetes module which allows us to interact with our Kubernetes cluster.
    • Since we need Istio, we're assuming Istio is already installed on the cluster. Istio setup typically involves applying CRDs, setting up the control plane, and often enabling automatic sidecar injection for namespaces where we want applications to be part of the service mesh.
    • We create a provider instance to interact with our Kubernetes cluster using configurations such as our kubeconfig.
    • We use Pulumi's Helm chart resource to deploy NATS. The nats helm chart is pulled from the official NATS helm repository and deployed into the nats namespace. We assume that this namespace has been configured for automatic sidecar injection by Istio.
    • We yield the URL of the deployed NATS service via an export, which will be necessary for applications to connect to NATS. The URL format assumes a LoadBalancer type service for NATS, which is common for cloud deployments. Adjust the status access according to your service type (like ClusterIP or NodePort).
    • Istio's telemetry such as logs, metrics, and traces will now automatically cover NATS, as it does with other services within the mesh.

    Please note that monitoring configuration for Istio telemetry may require additional steps if you need customization beyond default settings, such as setting up a Prometheus ServiceMonitor. This setup is specific to the monitoring tools you're using and might involve creating additional Kubernetes resources.

    For further resources on Istio and NATS, you can visit:


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