feat: refactor to terraform module to deploy weather server appplication

DockerfileWeather

@@ -43,7 +43,7 @@ RUN make build-weather \
     GOBUILDFLAGS="-a -tags netgo -installsuffix netgo" \
     LDFLAGS="-w -s -d"
 
-FROM scratch
+FROM alpine
 
 USER appuser:appuser
 
@@ -52,7 +52,7 @@ COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=builder /etc/passwd /etc/passwd
 COPY --from=builder /etc/group /etc/group
 COPY --from=builder --chown=appuser:appuser /data/bin/* /go/bin/weather
-COPY --from=builder --chown=appuser:appuser /data/certs/out/weather* /go
+COPY --from=builder --chown=appuser:appuser /data/certs/out/weather* /go/certs/out/
 
 WORKDIR /go
 ENTRYPOINT ["/go/bin/weather"]

Makefile

@@ -52,9 +52,9 @@ get-root-ca:
 docker: docker-build-poller docker-build-weather docker-push
 
 docker-build-poller:
-	docker build -t docker.registry:5000/weather/poller:$(POLLER_VERSION) -f DockerfilePoller .
+	docker build --force-rm -t docker.registry:5000/weather/poller:$(POLLER_VERSION) -f DockerfilePoller .
 docker-build-weather:
-	docker build -t docker.registry:5000/weather/server:$(WEATHER_VERSION) -f DockerfileWeather .
+	docker build --force-rm -t docker.registry:5000/weather/server:$(WEATHER_VERSION) -f DockerfileWeather .
 
 docker-push:
 	docker push docker.registry:5000/weather/poller:$(POLLER_VERSION)

manifests/application/application.tf

@@ -1,13 +1,22 @@
+locals {
+  application_name_prefixed = format("%s-application", var.application_name)
+}
 resource "kubernetes_deployment" "application" {
   metadata {
-    name = "poller-application"
+    name = local.application_name_prefixed
     labels = {
       app = local.service_match_label
-      env = local.environment
+      env = var.environment
     }
-    namespace = kubernetes_namespace.application_namespace.id
+    namespace = var.kubernetes_namespace.id
   }
   spec {
+    dynamic strategy {
+      for_each = var.expose_application ? [1] : []
+      content {
+        type = "Recreate"
+      }
+    }
     replicas = 1
     revision_history_limit = 0
     selector {
@@ -19,14 +28,14 @@ resource "kubernetes_deployment" "application" {
       metadata {
         labels = {
           app = local.deployment_match_label
-          env = local.environment
+          env = var.environment
         }
       }
       spec {
         volume {
           name = local.config_volume_name
           config_map {
-            name = kubernetes_config_map.weather_config.metadata.0.name
+            name = var.kubernetes_config_map.name
           }
         }
         volume {
@@ -36,9 +45,9 @@ resource "kubernetes_deployment" "application" {
           }
         }
         container {
-          image = format("%s:%s", var.application_image_tag, var.application_version)
+          image = var.application_image
-          name  = "poller-application"
+          name  = local.application_name_prefixed
-          args = ["-filename", "/conf/config.hcl", "-logLevel", "info", "-logOutput", "/logs/weather.log", "-check-interval", "1h"]
+          args = var.application_args
           volume_mount {
             mount_path = "/conf"
             name = local.config_volume_name
@@ -57,6 +66,28 @@ resource "kubernetes_deployment" "application" {
               memory = "50Mi"
             }
           }
+          dynamic port {
+            for_each = var.expose_application ? [1] : []
+            content {
+              container_port = 8080
+              host_port = 8080
+            }
+          }
+
+          dynamic liveness_probe {
+            for_each = var.expose_application ? [1] : []
+            content {
+              http_get {
+                path = "/api/health"
+                port = 8080
+                scheme = "HTTPS"
+                http_header {
+                  name  = "X-Custom-Header"
+                  value = "kube-liveness-probe"
+                }
+              }
+            }
+          }
         }
       }
     }
@@ -70,8 +101,8 @@ resource "kubernetes_deployment" "application" {
 
 resource "kubernetes_persistent_volume_claim" "log_volume_claim" {
   metadata {
-    namespace = kubernetes_namespace.application_namespace.id
+    namespace = var.kubernetes_namespace.id
-    name = "log-weather-pvc"
+    name = format("log-%s-pvc", var.application_name)
   }
   spec {
     storage_class_name = "dx30-nfs"

manifests/application/variables.tf

@@ -0,0 +1,37 @@
+variable "kubernetes_namespace" {
+  description = "kubernetes namespace containing deployed resource"
+  type = object({
+    id: string
+  })
+}
+variable "kubernetes_config_map" {
+  description = "kubernetes config map use to configure deployed application"
+  type = object({
+    name: string
+  })
+}
+
+variable "environment" {
+  description = "application environment"
+}
+variable "application_name" {
+  description = "prefix name of application to deploy"
+}
+variable "application_image" {
+  description = "docker registry image/version to deploy"
+}
+variable "application_args" {
+  description = "args list to specify at application container"
+  type = list(string)
+  default = []
+}
+variable "expose_application" {
+  default = false
+  type = bool
+}
+locals {
+  config_volume_name = format("config-%s-volume", var.application_name)
+  log_volume_name = format("log-%s-volume", var.application_name)
+  service_match_label = format("%s-service", var.application_name)
+  deployment_match_label = format("%s-deployment", var.application_name)
+}

manifests/common.tf

@@ -21,3 +21,24 @@ s3 {
 EOF
   }
 }
+
+// deploy poller application
+module "poller_application" {
+  source = "./application"
+  environment = var.environment
+  application_name = "poller"
+  kubernetes_namespace = kubernetes_namespace.application_namespace
+  application_image = format("docker.registry/weather/poller:%s", var.poller_version)
+  kubernetes_config_map = kubernetes_config_map.weather_config.metadata.0
+  application_args = ["-filename", "/conf/config.hcl", "-logLevel", "info", "-logOutput", "/logs/weather.log", "-check-interval", "1h"]
+}
+// deploy weather server application
+module "weather_server_application" {
+  source = "./application"
+  environment = var.environment
+  application_name = "weather-server"
+  kubernetes_namespace = kubernetes_namespace.application_namespace
+  application_image = format("docker.registry/weather/server:%s", var.poller_version)
+  kubernetes_config_map = kubernetes_config_map.weather_config.metadata.0
+  expose_application = true
+}

manifests/variables.tf

@@ -1,8 +1,14 @@
+variable "environment" {
+  default = "prod"
+}
+
 variable "openweather_secret" {
   description = "open weather api secret"
+  sensitive = true
 }
 variable "S3_key_secret" {
   description = "S3 backend key secret"
+  sensitive = true
 }
 variable "S3_endpoint" {
   default = "s3.localdomain"
@@ -16,18 +22,12 @@ variable "S3_key_id" {
   default = "antoine"
   description = "S3 backend key id"
 }
-variable "application_image_tag" {
+
-  default = "docker.registry/weather/poller"
+variable "poller_version" {
-  description = "container tag deployed"
-}
-variable "application_version" {
   default = "latest"
-  description = "container tag version deployed"
+  description = "poller container version"
 }
-locals {
+variable "weather_version" {
-  service_match_label = "weather-service"
+  default = "latest"
-  deployment_match_label = "poller-deployment"
+  description = "poller container version"
-  environment = "prod"
-  config_volume_name = "config-weather-volume"
-  log_volume_name ="log-weather-volume"
 }