1. Answers
  2. Deploy Kubernetes AlertmanagerConfig with Pulumi

How do I deploy a Kubernetes monitoring.coreos.com AlertmanagerConfig with Pulumi?

In this guide, we will deploy a Kubernetes AlertmanagerConfig resource using Pulumi. The AlertmanagerConfig resource is part of the Prometheus Operator and is used to configure Alertmanager instances in a Kubernetes cluster. We will define the necessary Kubernetes resources and deploy them using Pulumi.

Steps:

  1. Install Pulumi and Kubernetes Provider: Ensure you have Pulumi installed and the Kubernetes provider configured.
  2. Define the AlertmanagerConfig Resource: Specify the configuration for Alertmanager, including routes, receivers, and other settings.
  3. Deploy the Resource: Use Pulumi to deploy the configuration to your Kubernetes cluster.

Below is the Pulumi program written in TypeScript that accomplishes this.

import * as pulumi from "@pulumi/pulumi";
import * as k8s from "@pulumi/kubernetes";

// Define the namespace for the AlertmanagerConfig
const namespace = new k8s.core.v1.Namespace("monitoring", {
    metadata: {
        name: "monitoring",
    },
});

// Define the AlertmanagerConfig resource
const alertmanagerConfig = new k8s.apiextensions.CustomResource("alertmanagerConfig", {
    apiVersion: "monitoring.coreos.com/v1alpha1",
    kind: "AlertmanagerConfig",
    metadata: {
        name: "example-alertmanagerconfig",
        namespace: namespace.metadata.name,
    },
    spec: {
        route: {
            groupBy: ['alertname'],
            groupWait: '30s',
            groupInterval: '5m',
            repeatInterval: '12h',
            receiver: 'default',
        },
        receivers: [{
            name: 'default',
            emailConfigs: [{
                to: 'example@example.com',
                from: 'alertmanager@example.com',
                smarthost: 'smtp.example.com:587',
                authUsername: 'alertmanager@example.com',
                authPassword: {
                    name: 'alertmanager-smtp-auth',
                    key: 'password',
                },
                authIdentity: 'alertmanager@example.com',
                requireTLS: true,
            }],
        }],
    },
});

// Export the namespace and AlertmanagerConfig metadata
export const namespaceName = namespace.metadata.name;
export const alertmanagerConfigName = alertmanagerConfig.metadata.name;

Key Points

  • Namespace: We first create a Kubernetes namespace named monitoring.
  • AlertmanagerConfig: We define an AlertmanagerConfig resource with a route and a receiver. The receiver is configured to send email notifications.
  • CustomResource: We use the apiextensions.CustomResource to create the AlertmanagerConfig since it is a custom resource provided by the Prometheus Operator.
  • Exported Values: We export the namespace and the AlertmanagerConfig names for reference.

Summary

In this guide, we deployed a Kubernetes AlertmanagerConfig resource using Pulumi. We defined the necessary configuration for Alertmanager, including routes and receivers, and used Pulumi to deploy these resources to a Kubernetes cluster. This setup allows for flexible and scalable alert management within Kubernetes.

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