feature/add manifests for k8s installation

k8s/README.md

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+# Kubernetes
+
+## Setup graph-explorer on kubernetes for tests using kustomize
+
+* Resources that will be created:
+
+* Namespace graph-explorer
+* Deployment (1 pod replica)
+* ClusterIP Service 
+
+
+```bash
+
+kubectl apply -k k8s/manifests/overlays/default
+
+```
+
+## Using port-forward to access the graph-explorer
+
+```bash
+kubectl port-forward svc/graph-explorer 8080:443
+```
+
+* Open the url to access on browser: [https://localhost:8080/explorer](https://localhost:8080/explorer)
+
+## Removing all resources:
+
+```bash
+
+kubectl delete -k k8s/manifests/overlays/default
+
+```

k8s/manifests/base/deployment.yaml

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+kind: Deployment
+apiVersion: apps/v1
+metadata:
+  name: graph-explorer
+  labels:
+    app: graph-explorer
+spec:
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxUnavailable: 20%
+      maxSurge: 50%
+  selector:
+    matchLabels:
+      app: graph-explorer
+  template:
+    metadata:
+      name: graph-explorer
+      labels:
+        app: graph-explorer
+    spec:
+      containers:
+      - name: graph-explorer
+        env:
+        - name: HOST
+          value: localhost
+        image: yros/graph-explorer:latest
+        imagePullPolicy: IfNotPresent
+        readinessProbe:
+          tcpSocket:
+            port: 443
+          initialDelaySeconds: 10
+          failureThreshold: 5
+          timeoutSeconds: 5
+          periodSeconds: 10
+        livenessProbe:
+          tcpSocket:
+            port: 443
+          initialDelaySeconds: 30
+          failureThreshold: 5
+          timeoutSeconds: 10
+          periodSeconds: 30
+        ports:
+        - containerPort: 443
+        resources:
+          requests:
+            cpu: 300m
+            memory: 512Mi
+          limits:
+            cpu: 500m
+            memory: 512Mi
+      terminationGracePeriodSeconds: 30
+      restartPolicy: Always
+      dnsConfig:
+        options:
+        - name: ndots
+          value: "1"
+      dnsPolicy: ClusterFirst

k8s/manifests/base/kustomization.yaml

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

k8s/manifests/base/namespace.yaml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: graph-explorer

k8s/manifests/base/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: graph-explorer
+spec:
+  selector:
+    app: graph-explorer
+  ports:
+  - name: https
+    port: 443
+    targetPort: 443
+    protocol: TCP
+  sessionAffinity: None
+  type: ClusterIP

k8s/manifests/overlays/default/kustomization.yaml

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+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: graph-explorer
+
+resources:
+- ../../base
+
+images:
+- name: yros/graph-explorer
+  newTag: latest