1. Answers
  2. Implementing cross-namespace secret sharing in Kubernetes

How do I implement cross-namespace secret sharing in Kubernetes?

In this guide, we will implement cross-namespace secret sharing in Kubernetes using Pulumi. This involves creating a secret in one namespace and then sharing it with another namespace by copying it. This is useful when you need to securely share credentials or other sensitive information between different applications running in separate namespaces.

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

// Define the first namespace where the secret will be created
const namespaceA = new k8s.core.v1.Namespace("namespaceA", {
    metadata: {
        name: "namespace-a",
    },
});

// Define the second namespace where the secret will be copied to
const namespaceB = new k8s.core.v1.Namespace("namespaceB", {
    metadata: {
        name: "namespace-b",
    },
});

// Create a secret in namespace A
const secretA = new k8s.core.v1.Secret("secretA", {
    metadata: {
        name: "my-secret",
        namespace: namespaceA.metadata.name,
    },
    stringData: {
        username: "admin",
        password: "P@ssw0rd",
    },
});

// Copy the secret to namespace B
const secretB = new k8s.core.v1.Secret("secretB", {
    metadata: {
        name: secretA.metadata.name,
        namespace: namespaceB.metadata.name,
    },
    stringData: secretA.stringData,
});

// Export the names of the namespaces and secrets
export const namespaceAName = namespaceA.metadata.name;
export const namespaceBName = namespaceB.metadata.name;
export const secretAName = secretA.metadata.name;
export const secretBName = secretB.metadata.name;

Key Points

  • We created two namespaces: namespace-a and namespace-b.
  • A secret named my-secret was created in namespace-a.
  • The secret was then copied to namespace-b with the same name and data.
  • The program exports the names of the namespaces and secrets for verification.

Summary

In this guide, we demonstrated how to share a secret across namespaces in Kubernetes using Pulumi. We created a secret in one namespace and copied it to another namespace, ensuring secure sharing of sensitive information between different applications.

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