Add kustomize basics

kustomize/base/deployment.yaml

+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deployment
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: app
+  template:
+    metadata:
+      labels:
+        app: app
+    spec:
+      containers:
+        - name: webserver
+          imagePullPolicy: Always
+          resources: {}
+          ports:
+            - name: http
+              containerPort: 80

kustomize/base/ingress.yaml

+---
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: ingress
+spec:
+  rules:
+    - host: HOST
+      http:
+        paths:
+          - backend:
+              serviceName: service-http
+              servicePort: 80
+            path: /PATH
+  tls:

kustomize/base/kustomization.yaml

+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+resources:
+  - deployment.yaml
+  - service.yaml
+  - ingress.yaml

kustomize/base/service.yaml

+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: service-http
+spec:
+  ports:
+    - name: http
+      port: 80
+  selector:
+    app: app

kustomize/overlays/staging/deployment.yaml

+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deployment
+spec:
+  template:
+    spec:
+      containers:
+        - name: webserver
+          image: WEBSERVER
+          ports:
+            - name: http
+              containerPort: 80

kustomize/overlays/staging/ingress.yaml

+---
+apiVersion: extensions/v1beta1
+kind: Ingress
+metadata:
+  name: ingress
+  annotations:
+    ingress.kubernetes.io/configuration-snippet: |
+      rewrite ^(/PATH)$ $1/ permanent;
+    ingress.kubernetes.io/rewrite-target: /
+    kubernetes.io/tls-acme: "true"
+spec:
+  rules:
+    - host: HOST
+      http:
+        paths:
+          - backend:
+              serviceName: service-http
+              servicePort: 80
+            path: /PATH
+  tls:
+    - hosts:
+        - kommul-dev.eurac.edu
+      secretName: kommul-dev.eurac.edu-NAME-tls

kustomize/overlays/staging/kustomization.yaml

+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+bases:
+  - ../../base
+
+patchesStrategicMerge:
+  - deployment.yaml
+  - ingress.yaml
+
+namePrefix: merlin-platform-
+# nameSuffix: -v1
+commonLabels:
+  variant: staging
+  org: commul
+  app: merlin-webpage
+commonAnnotations:
+  note: merlin-platform-note
+namespace: kommul-dev
+
+images:
+  - name: WEBSERVER
+    newName: gitlab.inf.unibz.it:4567/commul/merlin-platform/www/master:445bc35dde4520cab61a36c793c7c5a626f43e62
+
+patchesJSON6902:
+  - target:
+      group: extensions
+      version: v1beta1
+      kind: Ingress
+      name: ingress
+    patch: |-
+      - op: replace
+        path: /metadata/annotations/ingress.kubernetes.io~1configuration-snippet
+        value: |
+          rewrite ^(/merlin)$ $1/ permanent;
+      - op: replace
+        path: /spec/rules/0/host
+        value: kommul-dev.eurac.edu
+      - op: replace
+        path: /spec/rules/0/http/paths/0/path
+        value: /merlin
+      - op: replace
+        path: /spec/tls/0/secretName
+        value: kommul-dev.eurac.edu-merlin-tls