From b22c9755d3afe380804a4a90977452547c893ebe Mon Sep 17 00:00:00 2001
From: Angelos Kolaitis <angelos.kolaitis@canonical.com>
Date: Wed, 30 Nov 2022 19:48:31 +0200
Subject: [PATCH] Add GCP cluster template

---
 README.md                           |  31 +++++++++
 templates/cluster-template-gcp.rc   |  15 ++++
 templates/cluster-template-gcp.yaml | 103 ++++++++++++++++++++++++++++
 3 files changed, 149 insertions(+)
 create mode 100644 templates/cluster-template-gcp.rc
 create mode 100644 templates/cluster-template-gcp.yaml

diff --git a/README.md b/README.md
index 950ae94..6ced325 100644
--- a/README.md
+++ b/README.md
@@ -225,6 +225,37 @@ microk8s kubectl apply -f cluster-azure.yaml
 
 > **Note**: Make sure you have the secret to include the password of the Service Principal identity. This secret will be referenced by the AzureClusterIdentity used by the AzureCluster.
 
+#### GCP
+
+> *NOTE*: Ensure that you have properly deployed the GCP infrastructure provider prior to executing the commands below. See [Initialization for common providers](https://cluster-api.sigs.k8s.io/user/quick-start.html#initialization-for-common-providers)
+
+Prior to generate a cluster template, you need to create a VM image for use in the cluster. The MicroK8s provider works with any stock Ubuntu image. Use the Ubuntu 22.04 LTS image with:
+
+```bash
+gcloud compute images create ubuntu-2204 --source-image-project ubuntu-os-cloud --source-image-family ubuntu-2204-lts
+```
+
+Make note of the name of the image `ubuntu-2204`, which we then feed into the cluster template.
+
+Generate a cluster template with:
+
+```bash
+# review list of variables needed for the cluster template
+clusterctl generate cluster microk8s-gcp --from ./templates/cluster-template-gcp.yaml --list-variables
+
+# set environment variables (edit the file as needed before sourcing it)
+source ./templates/cluster-template-gcp.rc
+
+# generate the cluster
+clusterctl generate cluster microk8s-gcp --from ./templates/cluster-template-gcp.yaml > cluster-gcp.yaml
+```
+
+Then, deploy the cluster with:
+
+```bash
+microk8s kubectl apply -f cluster-gcp.yaml
+```
+
 ## Development
 
 The two MicroK8s CAPI providers, the bootstrap and control plane, serve distinct purposes:
diff --git a/templates/cluster-template-gcp.rc b/templates/cluster-template-gcp.rc
new file mode 100644
index 0000000..af882d6
--- /dev/null
+++ b/templates/cluster-template-gcp.rc
@@ -0,0 +1,15 @@
+# Kubernetes cluster configuration
+export KUBERNETES_VERSION=1.25.0
+export CONTROL_PLANE_MACHINE_COUNT=1
+export WORKER_MACHINE_COUNT=1
+
+# GCP configuration
+export GCP_REGION="europe-west"
+export GCP_NETWORK_NAME="default"
+export GCP_PROJECT="my-gcp-project-name"
+
+# GCP machine configuration
+export GCP_PUBLIC_IP=true              # set to false if you have configured a cloud NAT
+export GCP_CONTROL_PLANE_MACHINE_TYPE=n1-standard-2
+export GCP_NODE_MACHINE_TYPE=n1-standard-2
+export IMAGE_ID=projects/$GCP_PROJECT/global/images/ubuntu-2204
diff --git a/templates/cluster-template-gcp.yaml b/templates/cluster-template-gcp.yaml
new file mode 100644
index 0000000..d8dc212
--- /dev/null
+++ b/templates/cluster-template-gcp.yaml
@@ -0,0 +1,103 @@
+# Based on https://github.com/kubernetes-sigs/cluster-api-provider-aws/releases/download/v1.5.0/cluster-template.yaml
+---
+apiVersion: cluster.x-k8s.io/v1beta1
+kind: Cluster
+metadata:
+  name: ${CLUSTER_NAME}
+spec:
+  clusterNetwork:
+    apiServerPort: 6443
+  infrastructureRef:
+    apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+    kind: GCPCluster
+    name: ${CLUSTER_NAME}
+  controlPlaneRef:
+    kind: MicroK8sControlPlane
+    apiVersion: controlplane.cluster.x-k8s.io/v1beta1
+    name: ${CLUSTER_NAME}-control-plane
+---
+apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+kind: GCPCluster
+metadata:
+  name: ${CLUSTER_NAME}
+spec:
+  project: "${GCP_PROJECT}"
+  region: "${GCP_REGION}"
+  network:
+    name: "${GCP_NETWORK_NAME}"
+---
+apiVersion: controlplane.cluster.x-k8s.io/v1beta1
+kind: MicroK8sControlPlane
+metadata:
+  name: "${CLUSTER_NAME}-control-plane"
+spec:
+  controlPlaneConfig:
+    initConfiguration:
+      joinTokenTTLInSecs: 900000
+      IPinIP: true
+      addons:
+        - dns
+        - ingress
+    clusterConfiguration:
+      portCompatibilityRemap: true
+  machineTemplate:
+    infrastructureTemplate:
+      apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+      kind: GCPMachineTemplate
+      name: "${CLUSTER_NAME}-control-plane"
+  replicas: ${CONTROL_PLANE_MACHINE_COUNT:=1}
+  version: "v${KUBERNETES_VERSION}"
+---
+apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+kind: GCPMachineTemplate
+metadata:
+  name: ${CLUSTER_NAME}-control-plane
+spec:
+  template:
+    spec:
+      instanceType: "${GCP_CONTROL_PLANE_MACHINE_TYPE}"
+      image: "${IMAGE_ID}"
+      publicIP: ${GCP_PUBLIC_IP}
+---
+apiVersion: cluster.x-k8s.io/v1beta1
+kind: MachineDeployment
+metadata:
+  name: "${CLUSTER_NAME}-md-0"
+spec:
+  clusterName: "${CLUSTER_NAME}"
+  replicas: ${WORKER_MACHINE_COUNT:=1}
+  selector:
+    matchLabels:
+  template:
+    spec:
+      clusterName: "${CLUSTER_NAME}"
+      version: "${KUBERNETES_VERSION}"
+      bootstrap:
+        configRef:
+          name: "${CLUSTER_NAME}-md-0"
+          apiVersion: bootstrap.cluster.x-k8s.io/v1beta1
+          kind: MicroK8sConfigTemplate
+      infrastructureRef:
+        name: "${CLUSTER_NAME}-md-0"
+        apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+        kind: GCPMachineTemplate
+---
+apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+kind: GCPMachineTemplate
+metadata:
+  name: ${CLUSTER_NAME}-md-0
+spec:
+  template:
+    spec:
+      instanceType: "${GCP_NODE_MACHINE_TYPE}"
+      image: "${IMAGE_ID}"
+---
+apiVersion: bootstrap.cluster.x-k8s.io/v1beta1
+kind: MicroK8sConfigTemplate
+metadata:
+  name: "${CLUSTER_NAME}-md-0"
+spec:
+  template:
+    spec:
+      clusterConfiguration:
+        portCompatibilityRemap: true