From 92b9e8b368e7e43e6ab795ec059ea731f6c50fc8 Mon Sep 17 00:00:00 2001
From: Ashley Felton <ashley@ropable.com>
Date: Tue, 23 Apr 2024 09:41:16 +0800
Subject: [PATCH] Added Kustomize resources: HorizontalPodAutoscaler for
 deployment workloads.

---
 README.md                                       | 14 ++++++++++----
 kustomize/base/deployment.yaml                  |  1 -
 kustomize/base/deployment_hpa.yaml              | 17 +++++++++++++++++
 kustomize/base/kustomization.yaml               |  1 +
 .../overlays/prod/deployment_hpa_patch.yaml     |  7 +++++++
 kustomize/overlays/prod/kustomization.yaml      |  1 +
 .../overlays/uat/deployment_hpa_patch.yaml      |  7 +++++++
 kustomize/overlays/uat/kustomization.yaml       |  1 +
 8 files changed, 44 insertions(+), 5 deletions(-)
 create mode 100644 kustomize/base/deployment_hpa.yaml
 create mode 100644 kustomize/overlays/prod/deployment_hpa_patch.yaml
 create mode 100644 kustomize/overlays/uat/deployment_hpa_patch.yaml

diff --git a/README.md b/README.md
index 3933b91..d4f3f04 100644
--- a/README.md
+++ b/README.md
@@ -4,12 +4,18 @@ MapProxy service application
 Basic MapProxy service used internally by the Department of Biodiversity,
 Conservation and Attractions.
 
+# Docker image
+
+To build a new Docker image from the `Dockerfile`:
+
+    docker image build -t ghcr.io/dbca-wa/mapproxy .
+
 # Running Docker container
 
-When running this image as a container or workload, remember to provide a
-configuration file at `/app/config/mapproxy.yaml` (this can be a bind-mounted
-local file or a configmap in Kubernetes).
+When running this image as a container, provide a configuration file
+mounted at `/app/config/mapproxy.yaml` (this can be a bind-mounted
+local file or a ConfigMap in Kubernetes).
 
-Example:
+Example using a local bind-mount file:
 
     docker container run -p 8080:8080 -v $PWD/mapproxy.yaml:/app/config/mapproxy.yaml ghcr.io/dbca-wa/mapproxy
diff --git a/kustomize/base/deployment.yaml b/kustomize/base/deployment.yaml
index 077e63a..760cc2c 100644
--- a/kustomize/base/deployment.yaml
+++ b/kustomize/base/deployment.yaml
@@ -3,7 +3,6 @@ kind: Deployment
 metadata:
   name: mapproxy-deployment
 spec:
-  replicas: 2
   strategy:
     type: RollingUpdate
   template:
diff --git a/kustomize/base/deployment_hpa.yaml b/kustomize/base/deployment_hpa.yaml
new file mode 100644
index 0000000..19449ff
--- /dev/null
+++ b/kustomize/base/deployment_hpa.yaml
@@ -0,0 +1,17 @@
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: mapproxy-deployment-hpa
+spec:
+  minReplicas: 1
+  maxReplicas: 3
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+  metrics:
+    - resource:
+        name: cpu
+        target:
+          type: Utilization
+          averageUtilization: 250
+      type: Resource
diff --git a/kustomize/base/kustomization.yaml b/kustomize/base/kustomization.yaml
index eb71186..acf5a05 100644
--- a/kustomize/base/kustomization.yaml
+++ b/kustomize/base/kustomization.yaml
@@ -2,5 +2,6 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
   - deployment.yaml
+  - deployment_hpa.yaml
   - pvc.yaml
   - service.yaml
diff --git a/kustomize/overlays/prod/deployment_hpa_patch.yaml b/kustomize/overlays/prod/deployment_hpa_patch.yaml
new file mode 100644
index 0000000..6ff5f16
--- /dev/null
+++ b/kustomize/overlays/prod/deployment_hpa_patch.yaml
@@ -0,0 +1,7 @@
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: mapproxy-deployment-hpa
+spec:
+  scaleTargetRef:
+    name: mapproxy-deployment-prod
diff --git a/kustomize/overlays/prod/kustomization.yaml b/kustomize/overlays/prod/kustomization.yaml
index fb1c519..a620349 100644
--- a/kustomize/overlays/prod/kustomization.yaml
+++ b/kustomize/overlays/prod/kustomization.yaml
@@ -15,6 +15,7 @@ labels:
       variant: prod
 patches:
   - path: deployment_patch.yaml
+  - path: deployment_hpa_patch.yaml
   - path: service_patch.yaml
 images:
   - name: ghcr.io/dbca-wa/mapproxy
diff --git a/kustomize/overlays/uat/deployment_hpa_patch.yaml b/kustomize/overlays/uat/deployment_hpa_patch.yaml
new file mode 100644
index 0000000..059d4e6
--- /dev/null
+++ b/kustomize/overlays/uat/deployment_hpa_patch.yaml
@@ -0,0 +1,7 @@
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: mapproxy-deployment-hpa
+spec:
+  scaleTargetRef:
+    name: mapproxy-deployment-uat
diff --git a/kustomize/overlays/uat/kustomization.yaml b/kustomize/overlays/uat/kustomization.yaml
index 86ae1b9..8ddd4cc 100644
--- a/kustomize/overlays/uat/kustomization.yaml
+++ b/kustomize/overlays/uat/kustomization.yaml
@@ -11,6 +11,7 @@ labels:
       variant: uat
 patches:
   - path: deployment_patch.yaml
+  - path: deployment_hpa_patch.yaml
   - path: service_patch.yaml
 configMapGenerator:
   - name: mapproxy-configmap