Merge pull request #16 from jugatsu/kubernetes-2

Add full app deployment in the Kubernetes cluster

.gitignore

@@ -9,3 +9,10 @@ build_info.txt
 # python
 *.pyc
 *.pyo
+
+# terraform
+*.tfstate
+*.tfstate.*.backup
+*.tfstate.backup
+*.tfvars
+.terraform/

infra/gke/main.tf

@@ -0,0 +1,47 @@
+// Ensure GKE cluster is present and configured
+resource "google_container_cluster" "cluster" {
+  description        = "GKE Cluster for Reddit-app"
+  enable_legacy_abac = false
+  initial_node_count = "${var.gke_node_count}"
+  min_master_version = "${var.gke_version}"
+  name               = "${var.gke_name}"
+  zone               = "${var.gke_zone}"
+
+  addons_config {
+    kubernetes_dashboard {
+      disabled = "${var.gke_dashboard_disabled}"
+    }
+  }
+
+  node_config {
+    disk_size_gb = "${var.gke_node_size}"
+    image_type   = "${var.gke_node_image}"
+    machine_type = "${var.gke_node_machine_type}"
+
+    oauth_scopes = [
+      "https://www.googleapis.com/auth/compute",
+      "https://www.googleapis.com/auth/devstorage.read_only",
+      "https://www.googleapis.com/auth/logging.write",
+      "https://www.googleapis.com/auth/monitoring",
+    ]
+  }
+
+  // configure kubectl
+  provisioner "local-exec" {
+    command = "gcloud container clusters get-credentials ${var.gke_name} --zone ${var.gke_zone} --project ${var.google_project}"
+  }
+}
+
+// Ensure firewall rule for application access is present and configured
+resource "google_compute_firewall" "firewall" {
+  name        = "gke-reddit-app"
+  description = "Allow access to reddit-app deployed in the Kubernetes"
+  network     = "default"
+
+  allow = {
+    protocol = "tcp"
+    ports    = ["30000-32767"]
+  }
+
+  source_ranges = ["0.0.0.0/0"]
+}

infra/gke/provider.tf

@@ -0,0 +1,12 @@
+// Configure the Google Cloud provider
+provider "google" {
+  version = "~> 1.3.0"
+
+  project = "${var.google_project}"
+  region  = "${var.google_region}"
+}
+
+// Configure the Kubernetes provider
+provider "kubernetes" {
+  version = "~> 1.0.1"
+}

infra/gke/terraform.tfvars.example

@@ -0,0 +1,5 @@
+#################################
+# Google Cloud Provider variables
+#################################
+
+google_project = "YOUR_PROJECT"

infra/gke/variables.tf

@@ -0,0 +1,53 @@
+#################################
+# Google Cloud Provider variables
+#################################
+
+variable "google_project" {
+  description = "The ID of the project"
+}
+
+variable "google_region" {
+  default     = "europe-west1"
+  description = "The region to operate under"
+}
+
+#################################
+# Kubernetes Provider variables
+#################################
+
+variable "gke_dashboard_disabled" {
+  default = true
+}
+
+variable "gke_name" {
+  default     = "cluster-1"
+  description = "The name of GKE cluster"
+}
+
+variable "gke_node_count" {
+  default     = 3
+  description = "The number of nodes in GKE cluster"
+}
+
+variable "gke_version" {
+  default = "1.8.3-gke.0"
+}
+
+variable "gke_zone" {
+  default = "europe-west1-c"
+}
+
+variable "gke_node_size" {
+  default     = 20
+  description = "Size of the disk attached to each node"
+}
+
+variable "gke_node_machine_type" {
+  default     = "n1-standard-1"
+  description = "The name of a Google Compute Engine machine type"
+}
+
+variable "gke_node_image" {
+  default     = "COS"
+  description = "The image type to use for this node"
+}

kubernetes/app/comment.yaml

@@ -0,0 +1,46 @@
+---
+# ------------------- Comment Deployment ------------------- #
+apiVersion: apps/v1beta2
+kind: Deployment
+metadata:
+  name: comment
+  labels:
+    app: reddit
+    component: comment
+spec:
+  selector:
+    matchLabels:
+      app: reddit
+      component: comment
+  replicas: 3
+  template:
+    metadata:
+      name: comment
+      labels:
+        app: reddit
+        component: comment
+    spec:
+      containers:
+      - image: jugatsu/comment:latest
+        name: comment
+        env:
+        - name: COMMENT_DATABASE_HOST
+          value: comment-db
+
+---
+# ------------------- Comment Service ------------------- #
+apiVersion: v1
+kind: Service
+metadata:
+  name: comment
+  labels:
+    app: reddit
+    component: comment
+spec:
+  ports:
+  - port: 9292
+    protocol: TCP
+    targetPort: 9292
+  selector:
+    app: reddit
+    component: comment

kubernetes/app/mongodb.yaml

@@ -0,0 +1,75 @@
+---
+# ------------------- MongoDB Deployment ------------------- #
+apiVersion: apps/v1beta1
+kind: Deployment
+metadata:
+  name: mongo
+  labels:
+    app: reddit
+    component: mongo
+    comment-db: "true"
+    post-db: "true"
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: reddit
+      component: mongo
+  template:
+    metadata:
+      name: mongo
+      labels:
+        app: reddit
+        component: mongo
+        comment-db: "true"
+        post-db: "true"
+    spec:
+      containers:
+      - image: mongo:3.2
+        name: mongo
+        volumeMounts:
+        - name: mongo-persistent-storage
+          mountPath: /data/db
+      volumes:
+      - name: mongo-persistent-storage
+        emptyDir: {}
+
+---
+# ------------------- Mongo-Comment Service ------------------- #
+apiVersion: v1
+kind: Service
+metadata:
+  name: comment-db
+  labels:
+    app: reddit
+    component: mongo
+    comment-db: "true"
+spec:
+  ports:
+  - port: 27017
+    protocol: TCP
+    targetPort: 27017
+  selector:
+    app: reddit
+    component: mongo
+    comment-db: "true"
+
+---
+# ------------------- Mongo-Post Service ------------------- #
+apiVersion: v1
+kind: Service
+metadata:
+  name: post-db
+  labels:
+    app: reddit
+    component: mongo
+    post-db: "true"
+spec:
+  ports:
+  - port: 27017
+    protocol: TCP
+    targetPort: 27017
+  selector:
+    app: reddit
+    component: mongo
+    post-db: "true"

kubernetes/app/post.yaml

@@ -0,0 +1,46 @@
+---
+# ------------------- Post Deployment ------------------- #
+apiVersion: apps/v1beta2
+kind: Deployment
+metadata:
+  name: post
+  labels:
+    app: reddit
+    component: post
+spec:
+  selector:
+    matchLabels:
+      app: reddit
+      component: post
+  replicas: 3
+  template:
+    metadata:
+      name: post
+      labels:
+        app: reddit
+        component: post
+    spec:
+      containers:
+      - image: jugatsu/post:latest
+        name: post
+        env:
+        - name: POST_DATABASE_HOST
+          value: post-db
+
+---
+# ------------------- Post Service ------------------- #
+apiVersion: v1
+kind: Service
+metadata:
+  name: post
+  labels:
+    app: reddit
+    component: post
+spec:
+  ports:
+  - port: 5000
+    protocol: TCP
+    targetPort: 5000
+  selector:
+    app: reddit
+    component: post

kubernetes/app/ui.yaml

@@ -0,0 +1,49 @@
+---
+# ------------------- UI Deployment ------------------- #
+apiVersion: apps/v1beta2
+kind: Deployment
+metadata:
+  name: ui
+  labels:
+    app: reddit
+    component: ui
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: reddit
+      component: ui
+  template:
+    metadata:
+      name: ui
+      labels:
+        app: reddit
+        component: ui
+    spec:
+      containers:
+      - image: jugatsu/ui:latest
+        name: ui
+        env:
+        - name: ENV
+          valueFrom:
+            fieldRef:
+              fieldPath: metadata.namespace
+
+---
+# ------------------- UI Service ------------------- #
+apiVersion: v1
+kind: Service
+metadata:
+  name: ui
+  labels:
+    app: reddit
+    component: ui
+spec:
+  type: NodePort
+  ports:
+  - port: 9292
+    protocol: TCP
+    targetPort: 9292
+  selector:
+    app: reddit
+    component: ui