Web Application on Kubernetes

The Kubernetes Application template creates an infrastructure as code project in your favorite language that deploys a web application to an existing cluster with Pulumi. It uses Pulumi’s Native Kubernetes Provider to create a new namespace in an existing Kubernetes cluster and a new deployment to host the application. It also exposes the application as a service that’s reachable from outside your cluster. The template generates a complete infrastructure as code program, including sample application code, to give you a working project out of the box that you can customize easily and extend to suit your needs.

An architecture diagram of the Pulumi Kubernetes Application template

Using this template

To use this template to deploy a web application to a Kubernetes cluster, make sure you’ve already provisioned a Kubernetes cluster, installed Pulumi and kubectl, and configured your kubeconfig file. Then create a new project using the template in your language of choice:

$ mkdir my-k8s-app && cd my-k8s-app
$ pulumi new webapp-kubernetes-typescript
$ mkdir my-k8s-app && cd my-k8s-app
$ pulumi new webapp-kubernetes-python
$ mkdir my-k8s-app && cd my-k8s-app
$ pulumi new webapp-kubernetes-go
$ mkdir my-k8s-app && cd my-k8s-app
$ pulumi new webapp-kubernetes-csharp
$ mkdir my-k8s-app && cd my-k8s-app
$ pulumi new webapp-kubernetes-yaml

Follow the prompts to complete the new-project wizard. When it’s done, you’ll have a complete Pulumi project that’s ready to deploy and configured with the most common settings. Feel free to inspect the code in index.js index.ts __main__.py main.go Program.cs Program.fs Program.vb App.java Pulumi.yaml for a closer look.

Deploying the project

The template requires no additional configuration. By default, it will install Nginx. Once the new project is created, you can deploy it immediately with pulumi up:

$ pulumi up

When the deployment completes, Pulumi exports the following stack output values:

deploymentName
The name of your new Kubernetes Deployment.
serviceName
The name of your new Kubernetes Service.

Output values like these are useful in many ways, most commonly as inputs for other stacks or related cloud resources.

Customizing the project

Projects created with the Kubernetes Application template expose the following configuration settings:

namespace
The name of the namespace to be created in your existing cluster. Defaults to default.
replicas
The number of replicated Pods to be created in your new Deployment. Defaults to 1.

All of these settings are optional and may be adjusted either by editing the stack configuration file directly (by default, Pulumi.dev.yaml) or by changing their values with pulumi config set as shown below.

$ pulumi config set someProp ../some/value
$ pulumi up

Tidying up

You can cleanly destroy the stack and all of its infrastructure with pulumi destroy:

$ pulumi destroy

Learn more

Congratulations! You’re now well on your way to managing a production-grade Kubernetes application with Pulumi — and there’s lots more you can do from here: