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Pulumi Kubernetes Operator

This page details how to use the Pulumi Kubernetes Operator to manage deploying Stacks based on commits to specific Git branches.

Overview

The Pulumi Kubernetes Operator is an extension pattern that enables Kuberentes users to create a Stack as a first-class API resource, and use the StackController to drive the updates of the Stack until success.

Deploying Pulumi Stacks in Kubernetes provides the capability to build out CI/CD and automation systems into your clusters, creating native support to manage your infrastructure alonside your Kubernetes workloads.

To work with the operator, we’ll need to follow these steps.

Deploy the Pulumi Kubernetes Operator

The operator is composed of:

  • A ServiceAccount for identity,
  • A Role and RoleBinding to the ServiceAccount for RBAC, and
  • A Deployment to manage the controller.

To create the operator, choose an installation preference using Pulumi with a supported programming language or kubectl with YAML.

When launched, the operator invokes the StackController to manages updates to Stack CustomResources created, updated, or deleted in Kubernetes.

These updates are run in the form of reconcilation loops that attempt to update a Stack until success is reached for the Git commit SHA provided, also known as the desired state.

Create a Stack CustomResource

The Stack CustomResource (CR) encapsulates a Pulumi project that creates any set of infrastructure resources such as cloud VMs, object storage, Kubernetes clusters, or Kubernetes workloads through API resources.

The Stack uses an existing Git repo, and checks out a specific Git commit SHA of the repo to deploy a pulumi up.

In the example below, we’re creating a Stack for an existing Pulumi project that provisions a simple NGINX Deployment in Kubernetes.

When the Stack is processed and deployed by the operator, NGINX will be created in the same cluster as the operator. This is because the NGINX Pulumi program does not explicitly use a Kubernetes Provider resource, and the Operator makes its ServiceAccount credentials available to Stacks that rely on the default, ambient kubeconfig credentials.

The role permissions for the operator can be adjusted to control what in-cluster API resources are allowed.

Choose your preferred language below, or check out Create Pulumi Stacks using kubectl.

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

// Get the Pulumi API token.
const pulumiConfig = new pulumi.Config();
const pulumiAccessToken = pulumiConfig.requireSecret("pulumiAccessToken")

// Create the API token as a Kubernetes Secret.
const accessToken = new kx.Secret("accesstoken", {
    stringData: { accessToken: pulumiAccessToken },
});

// Create an NGINX deployment in-cluster.
const mystack = new k8s.apiextensions.CustomResource("my-stack", {
    apiVersion: 'pulumi.com/v1alpha1',
    kind: 'Stack',
    spec: {
        accessTokenSecret: accessToken.metadata.name,
        stack: "<YOUR_ORG>/nginx/dev",
        initOnCreate: true,
        projectRepo: "https://github.com/metral/pulumi-nginx",
        commit: "2b0889718d3e63feeb6079ccd5e4488d8601e353",
        destroyOnFinalize: true,
    }
});
import pulumi
from pulumi_kubernetes import core, apiextensions

# Get the Pulumi API token.
pulumi_config = pulumi.Config()
pulumi_access_token = pulumi_config.require_secret("pulumiAccessToken")

# Create the API token as a Kubernetes Secret.
access_token = core.v1.Secret("accesstoken", string_data={ "access_token": pulumi_access_token })

# Create an NGINX deployment in-cluster.
my_stack = apiextensions.CustomResource("my-stack",
    api_version="pulumi.com/v1alpha1",
    kind="Stack",
    spec={
        "access_token_secret": access_token.metadata["name"],
        "stack": "<YOUR_ORG>/nginx/dev",
        "init_on_create": True,
        "project_repo": "https://github.com/metral/pulumi-nginx",
        "commit": "2b0889718d3e63feeb6079ccd5e4488d8601e353",
        "destroy_on_finalize": True,
    }
)
using Pulumi;
using Pulumi.Kubernetes.ApiExtensions;
using Pulumi.Kubernetes.Core.V1;
using Pulumi.Kubernetes.Types.Inputs.Core.V1;

class StackArgs : CustomResourceArgs
{
    [Input("spec")]
    public Input<StackSpecArgs>? Spec { get; set; }

    public StackArgs() : base("pulumi.com/v1alpha1", "Stack")
    {
    }
}

class StackSpecArgs : ResourceArgs
{
    [Input("accessTokenSecret")]
    public Input<string>? AccessTokenSecret { get; set; }

    [Input("stack")]
    public Input<string>? Stack { get; set; }

    [Input("initOnCreate")]
    public Input<bool>? InitOnCreate { get; set; }

    [Input("projectRepo")]
    public Input<string>? ProjectRepo { get; set; }

    [Input("commit")]
    public Input<string>? Commit { get; set; }

    [Input("destroyOnFinalize")]
    public Input<bool>? DestroyOnFinalize { get; set; }
}

class MyStack : Stack
{
    public MyStack()
    {
        // Get the Pulumi API token.
        var config = new Config();
        var pulumiAccessToken = config.RequireSecret("pulumiAccessToken");

        // Create the API token as a Kubernetes Secret.
        var accessToken = new Secret("accesstoken", new SecretArgs
        {
            StringData =
            {
                {"accessToken", pulumiAccessToken}
            }
        });

        // Create an NGINX deployment in-cluster.
        var myStack = new Pulumi.Kubernetes.ApiExtensions.CustomResource("nginx", new StackArgs
        {
            Spec = new StackSpecArgs
            {
                AccessTokenSecret = accessToken.Metadata.Apply(m => m.Name),
                Stack = "<YOUR_ORG>/nginx/dev",
                InitOnCreate = true,
                ProjectRepo = "https://github.com/metral/pulumi-nginx",
                Commit = "2b0889718d3e63feeb6079ccd5e4488d8601e353",
                DestroyOnFinalize = true,
            }
        });
    }
}
package main

import (
    "github.com/pulumi/pulumi-kubernetes/sdk/v2/go/kubernetes"
    apiextensions "github.com/pulumi/pulumi-kubernetes/sdk/v2/go/kubernetes/apiextensions"
    corev1 "github.com/pulumi/pulumi-kubernetes/sdk/v2/go/kubernetes/core/v1"
    metav1 "github.com/pulumi/pulumi-kubernetes/sdk/v2/go/kubernetes/meta/v1"
    "github.com/pulumi/pulumi/sdk/v2/go/pulumi"
    "github.com/pulumi/pulumi/sdk/v2/go/pulumi/config"
)

func main() {
    pulumi.Run(func(ctx *pulumi.Context) error {
        // Get the Pulumi API token.
        c := config.New(ctx, "")
        pulumiAccessToken := c.Require("pulumiAccessToken")

        // Create the API token as a Kubernetes Secret.
        accessToken, err := corev1.NewSecret(ctx, "accesstoken", &corev1.SecretArgs{
            StringData: pulumi.StringMap{"accessToken": pulumi.String(pulumiAccessToken)},
        })
        if err != nil {
            return err
        }

        // Create an NGINX deployment in-cluster.
        _, err = apiextensions.NewCustomResource(ctx, "my-stack", &apiextensions.CustomResourceArgs{
            ApiVersion: pulumi.String("pulumi.com/v1alpha1"),
            Kind:       pulumi.String("Stack"),
            OtherFields: kubernetes.UntypedArgs{
                "spec": map[string]interface{}{
                    "accessTokenSecret": accessToken.Metadata.Name(),
                    "stack":             "<YOUR_ORG>/nginx/dev",
                    "initOnCreate":      true,
                    "projectRepo":       "https://github.com/metral/pulumi-nginx",
                    "commit":            "2b0889718d3e63feeb6079ccd5e4488d8601e353",
                    "destroyOnFinalize": true,
                },
            },
        }, pulumi.DependsOn([]pulumi.Resource{accessToken}))
        return err
    })
}

Stack Settings

Stack CustomResources provide the following properties to configure the Stack update run:

  • The first is the access token secret (PULUMI_ACCESS_TOKEN), which is required to authenticate with pulumi.com to perform the update. You can create a new Pulumi access token specifically for your CI/CD job on your Pulumi Account page.
  • Environment variables for the Stack that are sourced from Kubernetes ConfigMaps and/or Secrets. Examples include cloud provider credentials and other application settings.
  • Pulumi Stack configs and secrets that can complement or override settings in the repo for use within the Stack.
  • Project repo settings like the repo URL, the commit to deploy, and a repo access token for private repos or rate-limiting.
  • Lifecyle control such as creating the stack if it does not exist, issuing a refresh before the update, and destroying the Stack’s resources and stack itself upon deletion of the CR.

Extended Examples

Check out how to manage a Kubernetes Blue/Green Deployment, or how to create AWS S3 buckets using the Operator and a Stack CR.

You can watch a demo below for a complete walkthrough.

Concurrency

When using the operator to continuously deploy your Pulumi stacks, you may run into a problem. What happens if multiple reconciliation loops run for the same commit in succession?

Operators, by definition, will invoke a reconciliation loop for the creation, update, or deletion of a Stack CR.

To avoid conflicting resource updates or corrupting resource state, Pulumi only runs one update at a time per stack. By default, the operator checks for updates already in progress, and will not spawn another reconciliation loop if one is already running.

You can optionally choose to retry on update conflicts by using the RetryOnUpdateConflict field in the Stack.

Note: This is only recommended if you are sure that the stack updates are idempotent, and if you are willing to accept retry loops until all spawned retries succeed. This will also create a more populated, and randomized activity timeline for the stack in the Pulumi Service.

Check out troubleshooting for more details, or open a new issue in GitHub.