How do I configure Alertmanager for Kubernetes alert routing and notification?

In this guide, we will configure Alertmanager for Kubernetes to handle alert routing and notification. Alertmanager is a component of the Prometheus ecosystem that manages alerts by deduplicating, grouping, and routing them to various receivers, such as email, Slack, or other messaging platforms.

We will deploy Alertmanager using Pulumi, set up a configuration for routing alerts, and create a Kubernetes Secret to store the Alertmanager configuration.

Key Points:

Deploy Alertmanager on Kubernetes using Pulumi.
Configure alert routing and notification.
Store Alertmanager configuration in a Kubernetes Secret.

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

// Define the Alertmanager configuration
const alertmanagerConfig = `
global:
  resolve_timeout: 5m

route:
  receiver: 'default'

receivers:
  - name: 'default'
    email_configs:
    - to: 'your-email@example.com'
      from: 'alertmanager@example.com'
      smarthost: 'smtp.example.com:587'
      auth_username: 'alertmanager@example.com'
      auth_password: 'your-email-password'
`;

// Create a Kubernetes Secret to store the Alertmanager configuration
const alertmanagerSecret = new k8s.core.v1.Secret("alertmanager-secret", {
    metadata: {
        name: "alertmanager-config",
        namespace: "monitoring",
    },
    stringData: {
        "alertmanager.yaml": alertmanagerConfig,
    },
});

// Deploy Alertmanager using a Kubernetes Deployment
const alertmanagerDeployment = new k8s.apps.v1.Deployment("alertmanager-deployment", {
    metadata: {
        name: "alertmanager",
        namespace: "monitoring",
    },
    spec: {
        replicas: 1,
        selector: {
            matchLabels: {
                app: "alertmanager",
            },
        },
        template: {
            metadata: {
                labels: {
                    app: "alertmanager",
                },
            },
            spec: {
                containers: [
                    {
                        name: "alertmanager",
                        image: "prom/alertmanager:v0.21.0",
                        args: [
                            "--config.file=/etc/alertmanager/alertmanager.yaml",
                        ],
                        volumeMounts: [
                            {
                                name: "config-volume",
                                mountPath: "/etc/alertmanager",
                            },
                        ],
                    },
                ],
                volumes: [
                    {
                        name: "config-volume",
                        secret: {
                            secretName: "alertmanager-config",
                        },
                    },
                ],
            },
        },
    },
});

// Expose Alertmanager using a Kubernetes Service
const alertmanagerService = new k8s.core.v1.Service("alertmanager-service", {
    metadata: {
        name: "alertmanager",
        namespace: "monitoring",
    },
    spec: {
        selector: {
            app: "alertmanager",
        },
        ports: [
            {
                port: 9093,
                targetPort: 9093,
            },
        ],
    },
});

export const alertmanagerUrl = pulumi.interpolate`http://${alertmanagerService.metadata.name}.${alertmanagerService.metadata.namespace}.svc.cluster.local:9093`;

Conclusion

In this guide, we deployed Alertmanager on Kubernetes using Pulumi, configured it for alert routing and notification, and created a Kubernetes Secret to store the configuration. This setup ensures that alerts are routed to the specified email address for notification.

Key points covered:

Deploying Alertmanager on Kubernetes.
Configuring alert routing and notification.
Storing Alertmanager configuration in a Kubernetes Secret.

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