How do I manage Kubernetes Ingress for ClickHouse?

In this guide, we will set up a Kubernetes Ingress resource for ClickHouse using Pulumi. ClickHouse is a fast open-source columnar database management system. We will define a Kubernetes Ingress resource to expose ClickHouse services to the outside world.

Key Points

Define a Kubernetes namespace for ClickHouse.
Deploy a ClickHouse StatefulSet and Service.
Create an Ingress resource to route traffic to the ClickHouse service.

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

// Define the namespace
const namespace = new k8s.core.v1.Namespace("clickhouse-ns", {
    metadata: {
        name: "clickhouse-ns",
    },
});

// Deploy ClickHouse StatefulSet
const clickhouseStatefulSet = new k8s.apps.v1.StatefulSet("clickhouse", {
    metadata: {
        namespace: namespace.metadata.name,
        name: "clickhouse",
    },
    spec: {
        serviceName: "clickhouse",
        replicas: 1,
        selector: {
            matchLabels: {
                app: "clickhouse",
            },
        },
        template: {
            metadata: {
                labels: {
                    app: "clickhouse",
                },
            },
            spec: {
                containers: [{
                    name: "clickhouse",
                    image: "yandex/clickhouse-server:latest",
                    ports: [{
                        containerPort: 8123,
                        name: "http",
                    }],
                    volumeMounts: [{
                        name: "clickhouse-storage",
                        mountPath: "/var/lib/clickhouse",
                    }],
                }],
            },
        },
        volumeClaimTemplates: [{
            metadata: {
                name: "clickhouse-storage",
            },
            spec: {
                accessModes: ["ReadWriteOnce"],
                resources: {
                    requests: {
                        storage: "10Gi",
                    },
                },
            },
        }],
    },
});

// Create a Service for ClickHouse
const clickhouseService = new k8s.core.v1.Service("clickhouse", {
    metadata: {
        namespace: namespace.metadata.name,
        name: "clickhouse",
    },
    spec: {
        ports: [{
            port: 8123,
            targetPort: "http",
            protocol: "TCP",
        }],
        selector: {
            app: "clickhouse",
        },
    },
});

// Define Ingress to expose ClickHouse service
const clickhouseIngress = new k8s.networking.v1.Ingress("clickhouse-ingress", {
    metadata: {
        namespace: namespace.metadata.name,
        name: "clickhouse-ingress",
        annotations: {
            "nginx.ingress.kubernetes.io/rewrite-target": "/",
        },
    },
    spec: {
        rules: [{
            host: "clickhouse.example.com",
            http: {
                paths: [{
                    path: "/",
                    pathType: "Prefix",
                    backend: {
                        service: {
                            name: clickhouseService.metadata.name,
                            port: {
                                number: 8123,
                            },
                        },
                    },
                }],
            },
        }],
    },
});

// Export the Ingress URL
export const ingressUrl = clickhouseIngress.metadata.name.apply(name => `http://${name}.example.com`);

Summary

In this guide, we created a Kubernetes namespace, deployed a ClickHouse StatefulSet and Service, and set up an Ingress resource to expose the ClickHouse service. The Ingress resource routes HTTP traffic to the ClickHouse service, making it accessible via a specified host.

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