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Guides - Deploy a Linode Kubernetes Engine Cluster Using Pulumi

Published

A managed Kubernetes service that enables you to easily control and scale your application’s infrastructure.

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In this Guide

This guide walks you through the steps needed to deploy a Kubernetes cluster using LKE and the popular infrastructure as code (IaC) tool, Pulumi.

Before you Begin

  1. Create a personal access token for Linode’s API v4. Follow the Getting Started with the Linode API to get a token. You will need a token to be able to create Linode resources using Pulumi.

    Note
    Ensure that your token has, at minimum, Read/Write permissions for Compute Instances, Kubernetes, NodeBalancers, and Volumes.

  2. Download and install Pulumi on your local machine.

  3. Create a free Pulumi Cloud account.

  4. Review the Getting Started With Pulumi guide to familiarize yourself with Pulumi concepts if you have not used the tool before. You need to be familiar with Pulumi and one of the supported programming languages. In this guide, TypeScript is used for the code examples.

  5. Install kubectl on your local machine.

Create your Pulumi Infrastructure Code

Create Pulumi infrastructure code that define the resources needed to create a Kubernetes cluster. You can create a minimal Pulumi project containing your resources, a stack which is an instance of your Pulumi program, and the configuration values for your stack. Setting up your Pulumi project in this way allows you to reuse your Pulumi program to deploy more Kubernetes clusters, if desired, by way of additional stacks.

Create your Pulumi project

Pulumi defines the elements of your Linode infrastructure using a regular programming language. Pulumi refers to these infrastructure elements as resources. After you declare your Pulumi infrastructure, you run pulumi up to create resources on the Linode platform. The Linode Provider for Pulumi exposes the Linode resources you need to deploy a Kubernetes cluster using LKE.

  1. Create a new directory for the Pulumi project containing your LKE cluster’s setup. Replace <lke-cluster> with your preferred directory name.

    mkdir <lke-cluster>

  2. In this new folder, create a new Pulumi project using the linode-typescript template:

    pulumi new
Please choose a template (8/220 shown):
[Use arrows to move, type to filter]
  kubernetes-yaml                    A minimal Kubernetes Pulumi YAML program
  linode-go                          A minimal Linode Go Pulumi program
  linode-javascript                  A minimal Linode JavaScript Pulumi program
  linode-python                      A minimal Linode Python Pulumi program
> linode-typescript                  A minimal Linode TypeScript Pulumi program
  linode-yaml                        A minimal Linode Pulumi YAML program
  oci-go                             A minimal OCI Go Pulumi program
  oci-java                           A minimal Java Pulumi program with Maven builds

    After selecting the template, the wizard prompts you for some more information:

    This command walks you through creating a new Pulumi project.

Enter a value or leave blank to accept the (default), and press <ENTER>.
Press ^C at any time to quit.

project name: (lke-cluster) 
project description: (A minimal Linode TypeScript Pulumi program) 
Created project 'lke-cluster'

Please enter your desired stack name.
To create a stack in an organization, use the format <org-name>/<stack-name> (e.g. `acmecorp/dev`).
stack name: (dev)
Created stack 'dev'

linode:token: The token that allows you access to your Linode account: 
Saved config

Installing dependencies...

added 194 packages, and audited 195 packages in 14s

found 0 vulnerabilities
Finished installing dependencies

Your new project is ready to go! ✨

To perform an initial deployment, run `pulumi up`

    Wherever a default value is presented between brackets, you can press the <Enter> key to accept this value. The wizard prompts you to enter the name of the first stack to create, in this case called dev.

  3. Using the text editor of your choice, open the index.ts file and create your cluster’s main configuration. Replace the contents to the file with the following:

    File: lke-cluster/index.ts
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    import * as pulumi from "@pulumi/pulumi";
import * as linode from "@pulumi/linode";

const config = new pulumi.Config()

// Create a Linode Kubernets Engine cluster
const cluster = new linode.LkeCluster("foobar", {
    k8sVersion: config.require('k8s_version'),
    label: config.require('label'),
    region: config.require('region'),
    tags: config.getObject<string[]>('tags'),
    pools: config.requireObject<linode.types.input.LkeClusterPool[]>('pools')
});

// Export some of the cluster's output properties
export const kubeconfig = cluster.kubeconfig;
export const apiEndpoints = cluster.apiEndpoints;
export const status = cluster.status;
export const id = cluster.id;
export const pool = cluster.pools;

    This file contains your cluster’s setup and stack outputs. In this example, you make use of Pulumi’s stack config so that your Pulumi program can be easily reused across different clusters.

    The cluster configuration is set using stack configuration. Each stack can have a different infrastructure configuration. This strategy can help you reuse, share, and version control your Pulumi programs.

    The Pulumi program uses the Linode provider to create a Kubernetes cluster. All arguments within the linode.LkeCluster resource are required, except for tags. The pools argument accepts a list of pool objects. In order to read the configuration for all the pools at once, the Pulumi program makes use of Pulumi’s structured configuration. Structured configuration allows for list values, maps & objects. Finally, stack outputs are defined in order to capture your cluster’s output properties that will be returned to Pulumi after creating your cluster.

    Note

    You do not have to mark any stack output as a secret when the resource output property is already marked as a secret. In the example configuration for the cluster though, the kubeconfig output property is a regular string value. By wrapping it in a pulumi.secret(...), the value is marked as a secret and Pulumi will make sure it is not outputted in clear text.

    See Pulumi’s secrets documentation for more details on the behavior of secrets with Inputs & Outputs.

    Note
    For a full list of linode.LkeCluster input properties, see the Linode Provider Pulumi documentation. You can update the index.ts file to include any additional arguments you would like to use.

Define your Stack Configuration

You need to define the values you would like to use in order to create your Kubernetes cluster. These values are stored as configuration in the stack file. Stack configuration should be the only place that requires updating when reusing the program created in this guide to deploy a new Kubernetes cluster or to add a new node pool to the cluster.

Stack configuration is usually set using the Pulumi CLI using the command pulumi config set.

  1. The Pulumi program for our cluster uses the Config object to retrieve a few named configuration items. You can set values for the (current) dev stack with the following commands:

    pulumi config set label "example-lke-cluster"
pulumi config set k8s_version "1.26"
pulumi config set region "us-west"

    So far, the values for stack configuration are simple strings. Pulumi also supports Structured Configuration, allowing list, map and object values. The commands to set such values are a bit more complex but still fully supported.

    pulumi config set --path 'pools[0].count' 3
pulumi config set --path 'pools[0].type' 'g6-standard-2'

    With the dev stack active as the current stack, the values should be added to the Pulumi.dev.yaml stack configuration file.

    Pulumi uses the values in this file to create a new Kubernetes cluster with one node pool that contains three 4 GB nodes. The cluster is located in the us-west data center (Dallas, Texas, USA). Each node in the cluster’s node pool uses Kubernetes version 1.26 and the cluster is named example-lke-cluster. You can replace any of the values in this file with your own preferred cluster configurations.

Deploy your Kubernetes Cluster

Now that all your Pulumi configuration is ready, you can deploy your Kubernetes cluster.

  1. Ensure that you are in your lke-cluster project directory which should contain your Pulumi program and stack configuration file.

    cd lke-cluster

  2. If you are using the Pulumi Cloud as state backend, run the login command.

    pulumi login

    Or export your Pulumi access token for the Pulumi Cloud to an environment variable.

    export PULUMI_ACCESS_TOKEN=pul-70a141.....40eebd
    Warning
    This last method commits the environment variable to your shell’s history, so take care when using this method.

  3. Preview the updates Pulumi executes before deploying your infrastructure. This command won’t take any actions or make any changes on your Linode account. It provides a report displaying all the resources that is created or modified when the plan is executed.

    pulumi preview

  4. Execute your Pulumi program to deploy your Kubernetes cluster.

    pulumi up

    Pulumi begins to create the resources you’ve defined. This process takes several minutes to complete. After the cluster has been successfully created the output includes a success message and the values that you exposed as stack outputs when creating your index.ts file.

    Updating (team-ce/dev)

View in Browser (Ctrl+O): https://app.pulumi.com/team-ce/lke-cluster/dev/updates/2

    Type                        Name             Status             
    pulumi:pulumi:Stack         lke-cluster-dev                     
+   └─ linode:index:LkeCluster  foobar           created (108s)     


Outputs:
  + apiEndpoints: [
  +     [0]: "https://a16255eb-d29e-4f1f-8224-ffa5ff6e4e52.us-west-1.linodelke.net:443"
  +     [1]: "https://a16255eb-d29e-4f1f-8224-ffa5ff6e4e52.us-west-1.linodelke.net:6443"
  +     [2]: "https://45.79.231.137:443"
  +     [3]: "https://45.79.231.137:6443"
    ]
  + id          : "126299"
  + kubeconfig  : [secret]
  + pool        : [
  +     [0]: {
          + autoscaler: <null>
          + count     : 3
          + id        : 187151
          + nodes     : [
          +     [0]: {
                  + id        : "187151-64e4b5432fab"
                  + instanceId: 48953345
                  + status    : "not_ready"
                }
          +     [1]: {
                  + id        : "187151-64e4b54353f5"
                  + instanceId: 48953348
                  + status    : "not_ready"
                }
          +     [2]: {
                  + id        : "187151-64e4b54376b5"
                  + instanceId: 48953350
                  + status    : "not_ready"
                }
            ]
          + type      : "g6-standard-2"
        }
    ]
  + status      : "ready"

Resources:
    + 1 created
    1 unchanged

Duration: 1m53s

Connect to your LKE Cluster

Now that your Kubernetes cluster is deployed, you can use kubectl to connect to it and begin defining your workload. Access your cluster’s kubeconfig and use it to connect to your cluster with kubectl.

  1. Use Pulumi to access your cluster’s kubeconfig, decode its contents, and save them to a file. Pulumi returns a base64 encoded string (a useful format for automated pipelines) representing your kubeconfig. Replace lke-cluster-config.yaml with your preferred file name.

    export KUBE_VAR=`pulumi stack output kubeconfig --show-secrets` && echo $KUBE_VAR | base64 -di > lke-cluster-config.yaml
    Note

    Depending on your local operating system, to decode the kubeconfig’s base64 format, you may need to replace base64 -di with base64 -D or just base64 -d. To determine which base64 option to use the following command:

    base64 --help

  2. Add the kubeconfig file to your $KUBECONFIG environment variable. This gives kubectl access to your cluster’s kubeconfig file.

    export KUBECONFIG=lke-cluster-config.yaml

  3. Verify that your cluster is selected as kubectl’s current context:

    kubectl config get-contexts

  4. View all nodes in your Kubernetes cluster using kubectl:

    kubectl get nodes

    Your output resembles the following example, but will vary depending on your own cluster’s configurations.

    NAME                            STATUS   ROLES    AGE     VERSION
lke126299-187151-64e4b5432fab   Ready    <none>   4m13s   v1.26.3
lke126299-187151-64e4b54353f5   Ready    <none>   3m44s   v1.26.3
lke126299-187151-64e4b54376b5   Ready    <none>   4m22s   v1.26.3

    Now that you are connected to your LKE cluster, you can begin using kubectl to deploy applications, inspect and manage cluster resources, and view logs.

Destroy your Kubernetes Cluster (optional)

Pulumi includes a destroy command to remove resources managed by Pulumi.

  1. Run the destroy command.

    pulumi destroy

    Pulumi first displays the list of resources & stack outputs that need to be deleted.

    Previewing destroy (team-ce/dev)

View in Browser (Ctrl+O): https://app.pulumi.com/team-ce/lke-cluster/dev/previews/76104ab8-eaf1-4b09-b361-11693a5da0b2

    Type                        Name             Plan
-   pulumi:pulumi:Stack         lke-cluster-dev  delete
-   └─ linode:index:LkeCluster  foobar           delete


Outputs:
  - apiEndpoints: [
  -     [0]: "https://a16255eb-d29e-4f1f-8224-ffa5ff6e4e52.us-west-1.linodelke.net:443"
  -     [1]: "https://a16255eb-d29e-4f1f-8224-ffa5ff6e4e52.us-west-1.linodelke.net:6443"
  -     [2]: "https://45.79.231.137:443"
  -     [3]: "https://45.79.231.137:6443"
    ]
  - id          : "126299"
  - kubeconfig  : [secret]
  - pool        : [
  -     [0]: {
          - autoscaler: <null>
          - count     : 3
          - id        : 187151
          - nodes     : [
          -     [0]: {
                  - id        : "187151-64e4b5432fab"
                  - instanceId: 48953345
                  - status    : "not_ready"
                }
          -     [1]: {
                  - id        : "187151-64e4b54353f5"
                  - instanceId: 48953348
                  - status    : "not_ready"
                }
          -     [2]: {
                  - id        : "187151-64e4b54376b5"
                  - instanceId: 48953350
                  - status    : "not_ready"
                }
            ]
          - type      : "g6-standard-2"
        }
    ]
  - status      : "ready"

Resources:
    - 2 to delete

Do you want to perform this destroy?  [Use arrows to move, type to filter]
  yes
> no
  details

    If you want to continue deleted the cluster, select yes after the preview and press <Enter>. Pulumi now deletes the cluster and the node pool.

More Information

You may wish to consult the following resources for additional information on this topic. While these are provided in the hope that they will be useful, please note that we cannot vouch for the accuracy or timeliness of externally hosted materials.

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