Add dev/stg/prod environments with per-env values, configmaps and secrets

- Move env-specific config into environments/<env>/{values,configmap,secret}.yaml
  for both nginx-chart and mysql-chart (dev, stg, prod)
- Make templates env-agnostic: resource names come from values
  (configMap.name, secret.name)
- nginx deployment mounts env ConfigMap and loads env Secret via envFrom
- mysql statefulset reads DB config from ConfigMap, passwords from Secret
- Remove mysql-chart/templates/secret.yaml (secrets are now per-env manifests)
- Add README with layout and deploy commands

nginx-chart/environments/dev/configmap.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: nginx-config-dev
+  namespace: dev
+  labels:
+    app: nginx
+    env: dev
+data:
+  default.conf: |
+    server {
+        listen 80;
+        server_name nginx.dev.local;
+
+        location / {
+            return 200 "nginx DEV environment\n";
+            add_header Content-Type text/plain;
+        }
+    }

nginx-chart/environments/dev/secret.yaml

@@ -0,0 +1,31 @@
+# ---------------------------------------------------------------------------
+# Registry pull secret used by the nginx Deployment (imagePullSecrets).
+# Replace the credentials with the real registry values, or regenerate with:
+#   kubectl create secret docker-registry harbor-secret \
+#     --docker-server=imageregistry.gen-itech.com \
+#     --docker-username=demo --docker-password=demo123 \
+#     -n dev --dry-run=client -o yaml
+# ---------------------------------------------------------------------------
+apiVersion: v1
+kind: Secret
+metadata:
+  name: harbor-secret
+  namespace: dev
+type: kubernetes.io/dockerconfigjson
+stringData:
+  .dockerconfigjson: |
+    {"auths":{"imageregistry.gen-itech.com":{"username":"demo","password":"demo123","auth":"ZGVtbzpkZW1vMTIz"}}}
+
+---
+# ---------------------------------------------------------------------------
+# Application secret for the nginx container (loaded via envFrom).
+# ---------------------------------------------------------------------------
+apiVersion: v1
+kind: Secret
+metadata:
+  name: nginx-secret-dev
+  namespace: dev
+type: Opaque
+stringData:
+  APP_ENV: dev
+  APP_SECRET: change-me-dev

nginx-chart/environments/dev/values.yaml

@@ -0,0 +1,16 @@
+# DEV environment overrides for nginx-chart
+namespace: dev
+
+replicaCount: 1
+
+image:
+  tag: "39"
+
+ingress:
+  host: nginx.dev.local
+
+configMap:
+  name: nginx-config-dev
+
+secret:
+  name: nginx-secret-dev

nginx-chart/environments/prod/configmap.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: nginx-config-prod
+  namespace: prod
+  labels:
+    app: nginx
+    env: prod
+data:
+  default.conf: |
+    server {
+        listen 80;
+        server_name nginx.prod.local;
+
+        location / {
+            return 200 "nginx PROD environment\n";
+            add_header Content-Type text/plain;
+        }
+    }

nginx-chart/environments/prod/secret.yaml

@@ -0,0 +1,31 @@
+# ---------------------------------------------------------------------------
+# Registry pull secret used by the nginx Deployment (imagePullSecrets).
+# Replace the credentials with the real registry values, or regenerate with:
+#   kubectl create secret docker-registry harbor-secret \
+#     --docker-server=imageregistry.gen-itech.com \
+#     --docker-username=demo --docker-password=demo123 \
+#     -n prod --dry-run=client -o yaml
+# ---------------------------------------------------------------------------
+apiVersion: v1
+kind: Secret
+metadata:
+  name: harbor-secret
+  namespace: prod
+type: kubernetes.io/dockerconfigjson
+stringData:
+  .dockerconfigjson: |
+    {"auths":{"imageregistry.gen-itech.com":{"username":"demo","password":"demo123","auth":"ZGVtbzpkZW1vMTIz"}}}
+
+---
+# ---------------------------------------------------------------------------
+# Application secret for the nginx container (loaded via envFrom).
+# ---------------------------------------------------------------------------
+apiVersion: v1
+kind: Secret
+metadata:
+  name: nginx-secret-prod
+  namespace: prod
+type: Opaque
+stringData:
+  APP_ENV: prod
+  APP_SECRET: change-me-prod

nginx-chart/environments/prod/values.yaml

@@ -0,0 +1,16 @@
+# PROD environment overrides for nginx-chart
+namespace: prod
+
+replicaCount: 3
+
+image:
+  tag: "39"
+
+ingress:
+  host: nginx.prod.local
+
+configMap:
+  name: nginx-config-prod
+
+secret:
+  name: nginx-secret-prod

nginx-chart/environments/stg/configmap.yaml

@@ -0,0 +1,19 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: nginx-config-stg
+  namespace: stg
+  labels:
+    app: nginx
+    env: stg
+data:
+  default.conf: |
+    server {
+        listen 80;
+        server_name nginx.stg.local;
+
+        location / {
+            return 200 "nginx STG environment\n";
+            add_header Content-Type text/plain;
+        }
+    }

nginx-chart/environments/stg/secret.yaml

@@ -0,0 +1,31 @@
+# ---------------------------------------------------------------------------
+# Registry pull secret used by the nginx Deployment (imagePullSecrets).
+# Replace the credentials with the real registry values, or regenerate with:
+#   kubectl create secret docker-registry harbor-secret \
+#     --docker-server=imageregistry.gen-itech.com \
+#     --docker-username=demo --docker-password=demo123 \
+#     -n stg --dry-run=client -o yaml
+# ---------------------------------------------------------------------------
+apiVersion: v1
+kind: Secret
+metadata:
+  name: harbor-secret
+  namespace: stg
+type: kubernetes.io/dockerconfigjson
+stringData:
+  .dockerconfigjson: |
+    {"auths":{"imageregistry.gen-itech.com":{"username":"demo","password":"demo123","auth":"ZGVtbzpkZW1vMTIz"}}}
+
+---
+# ---------------------------------------------------------------------------
+# Application secret for the nginx container (loaded via envFrom).
+# ---------------------------------------------------------------------------
+apiVersion: v1
+kind: Secret
+metadata:
+  name: nginx-secret-stg
+  namespace: stg
+type: Opaque
+stringData:
+  APP_ENV: stg
+  APP_SECRET: change-me-stg

nginx-chart/environments/stg/values.yaml

@@ -0,0 +1,16 @@
+# STG (staging) environment overrides for nginx-chart
+namespace: stg
+
+replicaCount: 2
+
+image:
+  tag: "39"
+
+ingress:
+  host: nginx.stg.local
+
+configMap:
+  name: nginx-config-stg
+
+secret:
+  name: nginx-secret-stg

nginx-chart/templates/deployment.yaml

@@ -18,9 +18,21 @@ spec:
         app: nginx
     spec:
       imagePullSecrets:
-      - name: harbor-secret
+      - name: {{ .Values.imagePullSecrets }}
       containers:
         - name: nginx
           image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
           ports:
-            - containerPort: 80
+            - containerPort: 80
+          envFrom:
+            - secretRef:
+                name: {{ .Values.secret.name }}
+          volumeMounts:
+            - name: nginx-config
+              mountPath: /etc/nginx/conf.d/default.conf
+              subPath: default.conf
+      volumes:
+        - name: nginx-config
+          configMap:
+            name: {{ .Values.configMap.name }}

nginx-chart/values.yaml

@@ -1,13 +1,38 @@
+# Base (default) values for nginx-chart.
+#
+# Environment-specific overrides live in environments/<env>/values.yaml and are
+# merged on top of this file at deploy time:
+#
+#   helm upgrade --install nginx ./nginx-chart -n <namespace> --create-namespace \
+#     -f nginx-chart/environments/<env>/values.yaml
+#
+# Available environments: dev, stg, prod
+
 replicaCount: 1
-namespace: "dev"
+
+namespace: dev
+
 image:
   repository: imageregistry.gen-itech.com/demo/applicationtest
   tag: "39"
   pullPolicy: IfNotPresent
+
+# Name of the docker-registry pull secret (created by environments/<env>/secret.yaml)
+imagePullSecrets: harbor-secret
+
 service:
   type: ClusterIP
   port: 80
+
 ingress:
   enabled: true
   className: traefik
   host: nginx.demo.local
+
+# Names of the ConfigMap / Secret created by environments/<env>/configmap.yaml
+# and environments/<env>/secret.yaml
+configMap:
+  name: nginx-config-dev
+
+secret:
+  name: nginx-secret-dev