ingres and refactoring

README.md

@@ -15,22 +15,34 @@ Powered with cutting edge *Foretold Termination™* technology (saves time on co
 
 ## Installation and usage
 
-**Installation example with kind:**
+**kind cluster [with ingress preparation](https://kind.sigs.k8s.io/docs/user/ingress/#using-ingress):**
 ```
 # cluster creation with `kind`
 kind create cluster --config=./kind.yaml
 
+# ingress NGINX controller
+kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/kind/deploy.yaml
+
+# wait until is ready to process requests running
+kubectl wait --namespace ingress-nginx \
+  --for=condition=ready pod \
+  --selector=app.kubernetes.io/component=controller \
+  --timeout=90s
+```
+
+**k8-calc installation:**
+```
 # installation
 helm install k8-calc k8-calc/
 
 # verification -- should output "69"
-curl http://localhost:30000/
+curl localhost/k8_calc
 ```
 
 **For different calculation *simply* do:**
 + run `kubectl edit configmap calculateme-configmap`
 + change `calculateme: 60+9` line, save and exit text editor
-+ check `http://localhost:30000/`
++ check `localhost/k8_calc`
 
 **To remove everything:**
 + run `kind delete cluster`

TODO.md

@@ -0,0 +1,3 @@
+- [x] Ingres
+- [ ] Argo CI/CD
+- [ ] Terraform configs for AWS/GCP/Azure

k8-calc/Chart.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: v2
 name: k8_calc
 description: https://github.com/banderlog/k8s_calc

k8-calc/templates/bc-deployment.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -17,20 +18,20 @@ spec:
         app: bc
     spec:
       containers:
-      - name: bc
-        image: busybox
-        env:
-        - name: INPUT
-          valueFrom:
-            configMapKeyRef:
-              name: calculateme-configmap
-              key: calculateme
-        command: ['sh']
-        args: ["-c", "echo ${INPUT} | bc -l > '/tmp/index.html'"]
-        volumeMounts:
-        - mountPath: /tmp
-          name: exch-vol
+        - name: bc
+          image: busybox
+          env:
+            - name: INPUT
+              valueFrom:
+                configMapKeyRef:
+                  name: calculateme-configmap
+                  key: calculateme
+          command: ['sh']
+          args: ["-c", "echo ${INPUT} | bc -l > '/tmp/index.html'"]
+          volumeMounts:
+            - mountPath: /tmp
+              name: exch-vol
       volumes:
-      - name: exch-vol
-        persistentVolumeClaim:
-          claimName: exch-vol
+        - name: exch-vol
+          persistentVolumeClaim:
+            claimName: exch-vol

k8-calc/templates/calc-vars.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: v1
 kind: ConfigMap
 metadata:

k8-calc/templates/exch-vol-persistentvolumeclaim.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
@@ -7,7 +8,7 @@ metadata:
   name: exch-vol
 spec:
   accessModes:
-  - ReadWriteOnce
+    - ReadWriteOnce
   resources:
     requests:
       storage: 1Mi

k8-calc/templates/http-output-deployment.yaml

@@ -1,3 +1,4 @@
+---
 apiVersion: apps/v1
 kind: Deployment
 metadata:
@@ -15,26 +16,25 @@ spec:
         app: output
     spec:
       containers:
-      - name: output
-        image: nginx
-        volumeMounts:
-        - mountPath: /usr/share/nginx/html/
-          name: exch-vol
+        - name: output
+          image: nginx
+          volumeMounts:
+            - mountPath: /usr/share/nginx/html/
+              name: exch-vol
       volumes:
-      - name: exch-vol
-        persistentVolumeClaim:
-          claimName: exch-vol
+        - name: exch-vol
+          persistentVolumeClaim:
+            claimName: exch-vol
 ---
 apiVersion: v1
 kind: Service
 metadata:
   name: output-service
 spec:
-  type: NodePort
   selector:
     app: output
   ports:
-  - protocol: TCP
-    port: 80
-    targetPort: 80
-    nodePort: 32000
+    # Default port used by the image (for Pod)
+    - targetPort: 80
+      # port on the Service
+      port: 5678

k8-calc/templates/ingres.yaml

@@ -0,0 +1,19 @@
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: minimal-ingress
+  annotations:
+    # overcome the exposed URL in the backend service
+    nginx.ingress.kubernetes.io/rewrite-target: "/"
+spec:
+  rules:
+    - http:
+        paths:
+          - pathType: Prefix
+            path: "/k8_calc"
+            backend:
+              service:
+                name: output-service
+                port:
+                  number: 5678

kind.yaml

@@ -1,13 +1,19 @@
-# for proper NodePort mapping
-# kind create cluster --config=./kind.yaml
-# https://stackoverflow.com/questions/62432961/how-to-use-nodeport-with-kind
-apiVersion: kind.x-k8s.io/v1alpha4
+# from https://kind.sigs.k8s.io/docs/user/ingress/
+---
 kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
 nodes:
-- role: control-plane
-  extraPortMappings:
-  - containerPort: 32000
-    hostPort: 30000
-    listenAddress: "0.0.0.0" # Optional, defaults to "0.0.0.0"
-    protocol: tcp # Optional, defaults to tcp
-- role: worker
+  - role: control-plane
+    kubeadmConfigPatches:
+      - |
+        kind: InitConfiguration
+        nodeRegistration:
+          kubeletExtraArgs:
+            node-labels: "ingress-ready=true"
+    extraPortMappings:
+      - containerPort: 80
+        hostPort: 80
+        protocol: TCP
+      - containerPort: 443
+        hostPort: 443
+        protocol: TCP