Add“postgres deploy with k8s”

postgres/README.md

@@ -56,6 +56,43 @@ Docker Hub.
 <!-- Optional -->
 ### Deploy with Kubernetes
 
+This image can also be deployed on a Kubernetes cluster, such as [minikube](https://kubernetes.io/docs/setup/learning-environment/minikube/).The following example YAML files are provided in the repository as reference for Kubernetes deployment:
+
+- [`postgres-deployment.yaml`](https://github.com/clearlinux/dockerfiles/blob/master/postgres/postgres-deployment.yaml): example using default configuration with secret to create a basic postgres service.
+- [`postgres-deployment-conf.yaml`](https://github.com/clearlinux/dockerfiles/blob/master/postgres/postgres-deployment-conf.yaml): example using your own custom configuration with secret to create  postgres service.
+
+
+
+Steps to deploy Postgres on a Kubernetes cluster:
+
+1. Create secret for postgres service.
+
+   ```
+   kubectl create secret generic postgres-config \
+   --from-literal=POSTGRES_DB=<your-postgres-db> \
+   --from-literal=POSTGRES_PASSWORD=<your-postgres-pwd> \
+   --from-literal=POSTGRES_USER=<your-postgres-user>
+   ```
+
+2. If you want to deploy `postgres-deployment.yaml` 
+
+   ```
+   kubectl create -f postgres-deployment.yaml
+   ```
+
+   Or if you want to deploy `postgres-deployment-conf.yaml` 
+
+   ```
+   kubectl create -f postgres-deployment-conf.yaml
+   ```
+
+3. Install PostgreSQL bundle and connect to the service, where 30001 is the port number defined in your service.
+
+   ```
+   swupd bundle-add postgresql
+   psql -h<nodeIP> -U<your-postgres-user> --password -p30001 <your-postgres-db>
+   ```
+
 <!-- Required -->
 ## Build and modify:
 

postgres/postgres-deployment-conf.yaml

@@ -0,0 +1,51 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: postgres
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+        - name: postgres
+          image: docker.io/clearlinux/postgres
+          imagePullPolicy: "IfNotPresent"
+          ports:
+            - containerPort: 5432
+          # customize your conf here
+          args: ["-c", "max_connections=666", "-c", "shared_buffers=1GB"]
+          env:
+            - name: POSTGRES_DB
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-config
+                  key: POSTGRES_DB
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-config
+                  key: POSTGRES_PASSWORD
+            - name: POSTGRES_USER
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-config
+                  key: POSTGRES_USER
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+  labels:
+    app: postgres
+spec:
+  type: NodePort
+  ports:
+   - port: 5432
+     targetPort: 5432
+     nodePort: 30001
+  selector:
+   app: postgres

postgres/postgres-deployment.yaml

@@ -0,0 +1,50 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: postgres
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: postgres
+    spec:
+      containers:
+        - name: postgres
+          image: docker.io/clearlinux/postgres
+          imagePullPolicy: "IfNotPresent"
+          ports:
+            - containerPort: 5432
+          env:
+            - name: POSTGRES_DB
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-config
+                  key: POSTGRES_DB
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-config
+                  key: POSTGRES_PASSWORD
+            - name: POSTGRES_USER
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-config
+                  key: POSTGRES_USER
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: postgres
+  labels:
+    app: postgres
+spec:
+  type: NodePort
+  ports:
+   - port: 5432
+     targetPort: 5432
+     nodePort: 30001
+  selector:
+   app: postgres
+