terraform-provider-kubectl

Kubernetes "kubectl" Provider

This provider is the best way of managing Kubernetes resources in Terraform, by allowing you to use the thing Kubernetes loves best - yaml!

This core of this provider is the kubectl_manifest resource, allowing free-form yaml to be processed and applied against Kubernetes. This yaml object is then tracked and handles creation, updates and deleted seamlessly - including drift detection!

A set of helpful data resources to process directories of yaml files and inline templating is available.

This terraform-provider-kubectl provider has been used by many large Kubernetes installations to completely manage the lifecycle of Kubernetes resources.

Installation

Terraform 0.13+

The provider can be installed and managed automatically by Terraform. Sample versions.tf file :

terraform {
  required_version = ">= 0.13"

  required_providers {
    kubectl = {
      source  = "bnu0/kubectl"
      version = ">= 1.7.0"
    }
  }
}

Terraform 0.12

Install latest version

The following one-liner script will fetch the latest provider version and download it to your ~/.terraform.d/plugins directory.

$ mkdir -p ~/.terraform.d/plugins && \
      curl -Ls https://api.github.com/repos/bnu0/terraform-provider-kubectl/releases/latest \
      | jq -r ".assets[] | select(.browser_download_url | contains(\"$(uname -s | tr A-Z a-z)\")) | select(.browser_download_url | contains(\"amd64\")) | .browser_download_url" \
      | xargs -n 1 curl -Lo ~/.terraform.d/plugins/terraform-provider-kubectl.zip && \
      pushd ~/.terraform.d/plugins/ && \
      unzip ~/.terraform.d/plugins/terraform-provider-kubectl.zip -d terraform-provider-kubectl-tmp && \
      mv terraform-provider-kubectl-tmp/terraform-provider-kubectl* . && \
      chmod +x terraform-provider-kubectl* && \
      rm -rf terraform-provider-kubectl-tmp && \
      rm -rf terraform-provider-kubectl.zip && \
      popd

Install manually

If you don't want to use the one-liner above, you can download a binary for your system from the release page, then either place it at the root of your Terraform folder or in the Terraform plugin folder on your system.

Quick Start

provider "kubectl" {
  host                   = var.eks_cluster_endpoint
  cluster_ca_certificate = base64decode(var.eks_cluster_ca)
  token                  = data.aws_eks_cluster_auth.main.token
  load_config_file       = false
}

resource "kubectl_manifest" "test" {
    yaml_body = <<YAML
apiVersion: couchbase.com/v1
kind: CouchbaseCluster
metadata:
  name: name-here-cluster
spec:
  baseImage: name-here-image
  version: name-here-image-version
  authSecret: name-here-operator-secret-name
  exposeAdminConsole: true
  adminConsoleServices:
    - data
  cluster:
    dataServiceMemoryQuota: 256
    indexServiceMemoryQuota: 256
    searchServiceMemoryQuota: 256
    eventingServiceMemoryQuota: 256
    analyticsServiceMemoryQuota: 1024
    indexStorageSetting: memory_optimized
    autoFailoverTimeout: 120
    autoFailoverMaxCount: 3
    autoFailoverOnDataDiskIssues: true
    autoFailoverOnDataDiskIssuesTimePeriod: 120
    autoFailoverServerGroup: false
YAML
}

See User Guide for details on installation and all the provided data and resource types.

Development Guide

If you wish to work on the provider, you'll first need Go installed on your machine (version 1.12+ is required). You'll also need to correctly setup a GOPATH, as well as adding $GOPATH/bin to your $PATH.

To compile the provider, run make build. This will build the provider and put the provider binary in the $GOPATH/bin directory.

Building The Provider

$ go get github.com/bnu0/terraform-provider-kubectl

Enter the provider directory and build the provider

$ cd $GOPATH/src/github.com/bnu0/terraform-provider-kubectl
$ make build

Testing

In order to test the provider, you can simply run make test.

$ make test

The provider uses k3s to run integration tests. These tests look for any *.tf files in the _examples folder and run an plan, apply, refresh and plan loop over each file.

Inside each file the string name-here is replaced with a unique name during test execution. This is a simple string replace before the TF is applied to ensure that tests don't fail due to naming clashes.

Each scenario can be placed in a folder, to help others navigate and use the examples, and added to the README.MD.

Note: The test infrastructure doesn't support multi-file TF configurations so ensure your test scenario is in a single file.

In order to run the full suite of Acceptance tests, run make testacc.

Note: Acceptance tests create real resources, and often cost money to run.

$ make testacc

Inspiration

Thanks to the original provider by nabancard and lawrecncegripper on the original base of this provider.