add stateless redis-guestbook example

okteto-redis-guestbook/README.md

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+# okteto-redis-guestbook
+Example of running [redis-guestbook](https://kubernetes.io/docs/tutorials/stateless-application/guestbook/)
+on [okteto-cloud](https://cloud.okteto.com/) using pure terraform
+
+Prerequisites
+* [Terraform > 0.12](https://www.terraform.io/downloads.html)
+* [Okteto Cloud account](https://cloud.okteto.com/#/login)
+
+Steps:
+1. Clone repo: `git clone [email protected]:jhole89/terraform-k8s-example.git`
+2. Change to this directory: `cd okteto-redis-guestbook`
+3. Initialise terraform: `terraform init`
+4. Copy tfvars template: `cp terraform.tfvars.template terraform.tfvars`
+5. Fill in `terraform.tfvars` with Okteto values (found in your `okteto-kube.config` - make sure your
+`okteto-kube.config` is also in your `~/.kube/config`)
+6. Apply terraform plan: `terraform apply --auto-approve` - you should see the following output
+    ```
+    Apply complete! Resources: 6 added, 0 changed, 0 destroyed.
+
+    Outputs:
+
+    frontend_url = https://frontend-jhole89.cloud.okteto.net/
+    ```
+6. The plan outputs the `url` exposed through the kubernetes service. You can now hit the 
+endpoint using any web browser.
+7. Once no longer required you can remove all resources: `terraform destroy --auto-approve`

okteto-redis-guestbook/frontend.tf

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+locals {
+  labels = {
+    app = "guestbook"
+    tier = "frontend"
+  }
+}
+
+resource "kubernetes_deployment" "frontend" {
+  metadata {
+    name = local.labels.tier
+    namespace = var.okteto_cluster_namespace
+    labels = {
+      app = local.labels.app
+    }
+  }
+  spec {
+    selector {
+      match_labels = local.labels
+    }
+    replicas = 3
+    template {
+      metadata {
+        labels = local.labels
+      }
+      spec {
+        container {
+          name = "php-redis"
+          image = "gcr.io/google-samples/gb-frontend:v4"
+          resources {
+            requests {
+              cpu = "100m"
+              memory = "100Mi"
+            }
+          }
+          env {
+            name = "GET_HOSTS_FROM"
+            value = "dns"
+          }
+          port {
+            container_port = 80
+          }
+        }
+      }
+    }
+  }
+}
+
+resource "kubernetes_service" "frontend" {
+  metadata {
+    name = kubernetes_deployment.frontend.metadata[0].name
+    namespace = var.okteto_cluster_namespace
+    labels = kubernetes_deployment.frontend.spec[0].template[0].metadata[0].labels
+  }
+  spec {
+    type = "NodePort"
+    port {
+      port = 80
+    }
+    selector = kubernetes_deployment.frontend.spec[0].template[0].metadata[0].labels
+  }
+}

okteto-redis-guestbook/outputs.tf

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+output "frontend_url" {
+  value = "https://${kubernetes_service.frontend.metadata[0].name}-${var.okteto_cluster_namespace}.cloud.okteto.net/"
+}

okteto-redis-guestbook/provider.tf

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+provider "kubernetes" {
+  config_context_auth_info =  var.okteto_cluser_user
+  config_context_cluster = var.okteto_cluster_name
+}

okteto-redis-guestbook/redis.tf

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+module "master" {
+  source = "./redis"
+
+  namespace = var.okteto_cluster_namespace
+  role = "master"
+  container_port = 6379
+  service_port = 6379
+}
+
+module "slave" {
+  source = "./redis"
+
+  namespace = var.okteto_cluster_namespace
+  role = "slave"
+  replicas = 2
+  container_port = 6379
+  service_port = 6379
+  env = [{
+    name = "GET_HOSTS_FROM"
+    value = "dns"
+  }]
+}

okteto-redis-guestbook/redis/main.tf

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+locals {
+  labels = {
+    app = "redis"
+    tier = "backend"
+    role = var.role
+  }
+}
+
+resource "kubernetes_deployment" "deployment" {
+  metadata {
+    name = "${local.labels.app}-${local.labels.role}"
+    namespace = var.namespace
+    labels = {
+      app = local.labels.app
+    }
+  }
+
+  spec {
+    replicas = 1
+
+    selector {
+      match_labels = local.labels
+    }
+    template {
+      metadata {
+        labels = local.labels
+      }
+      spec {
+        container {
+          name = local.labels.role
+          image = var.role == "master" ? "k8s.gcr.io/redis:e2e" : "gcr.io/google_samples/gb-redisslave:v3"
+          resources {
+            requests {
+              cpu = "100m"
+              memory = "100Mi"
+            }
+          }
+          port {
+            container_port = var.container_port
+          }
+          dynamic env {
+            for_each = var.env
+            content {
+              name = env.value["name"]
+              value = env.value["value"]
+            }
+          }
+        }
+      }
+    }
+  }
+}
+
+resource "kubernetes_service" "service" {
+  metadata {
+    name = kubernetes_deployment.deployment.metadata[0].name
+    namespace = var.namespace
+    labels = kubernetes_deployment.deployment.spec[0].template[0].metadata[0].labels
+  }
+
+  spec {
+    selector = kubernetes_deployment.deployment.metadata[0].labels
+
+    port {
+      port = var.service_port
+      target_port = kubernetes_deployment.deployment.spec[0].template[0].spec[0].container[0].port[0].container_port
+    }
+  }
+}

okteto-redis-guestbook/redis/outputs.tf

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+output "service_endpoint" {
+  value = "https://${kubernetes_service.service.metadata[0].name}-${var.namespace}.cloud.okteto.net/"
+}

okteto-redis-guestbook/redis/variables.tf

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+variable "role" {
+  type = string
+  description = "The node role. Must be one of master | slave"
+  default = "slave"
+}
+
+variable "namespace" {
+  type = string
+  description = "k8s namespace"
+}
+
+variable "replicas" {
+  type = number
+  default = 1
+}
+
+variable "container_port" {
+  type = number
+  description = "The container port"
+}
+
+variable "service_port" {
+  type = number
+  description = "The service port"
+}
+
+variable "env" {
+  type = list(map(string))
+  default = []
+}

okteto-redis-guestbook/terraform.tfvars.template

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+okteto_cluster_name = ""
+okteto_cluser_user = ""
+okteto_cluster_namespace = ""

okteto-redis-guestbook/variables.tf

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+variable "okteto_cluster_name" {}
+variable "okteto_cluser_user" {}
+variable "okteto_cluster_namespace" {}