CREATE-KUBERNETES-DEPLOYMENT.MD

Create the Kubernetes Deployment for our Docker Image

Write the Deployment Specification

The deployment.yaml is where you specify the Docker Image for your application along with other specs

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  labels:
    app: daytrader-gateway
  name: daytrader-gateway
  namespace: default
spec:
  replicas: 1
  selector:
    matchLabels:
      app: daytrader-gateway
  template:
    metadata:
      labels:
        app: daytrader-gateway
    spec:
      containers:
      - name: daytrader-gateway
        image: dhvines/daytrader-gateway:4.0.18
        imagePullPolicy: Always
        ports:
        - containerPort: 2443
          protocol: TCP
        readinessProbe:  
          httpGet:
            path: /health
            scheme: HTTPS
            port: 2443
          initialDelaySeconds: 30
          periodSeconds: 30
          timeoutSeconds: 10
        livenessProbe:  
          httpGet:
            path: /health
            scheme: HTTPS
            port: 2443
          initialDelaySeconds: 30
          periodSeconds: 30
          timeoutSeconds: 10
          failureThreshold: 4
        env:
        - name: ACCOUNTS_SERVICE_ROUTE
          value: https://daytrader-accounts
        - name: GATEWAY_SERVICE_ROUTE
          value: https://daytrader-gateway
        - name: PORTFOLIOS_SERVICE_ROUTE
          value: https://daytrader-portfolios
        - name: QUOTES_SERVICE_ROUTE
          value: https://daytrader-quotes
        - name: GET_HOSTS_FROM
          value: dns

Create the Deloyment Resource

1. $ kubectl apply -f deployment.yaml

   This command creates a Deployment resource, which creates the ReplicaSet, which then creates the Pods

2. $ kubectl get pods

   NAME	READY	STATUS	RESTARTS	AGE
   daytrader-gateway-xxxxxxxxx-xxxxx	1/1	Running	0	6m

   Wait until you see READY 1/1 and STATUS Running

3. Review the pods (application) logs

   $ kubectl logs daytrader-gateway-xxxxxxxxx-xxxxx -f

   You should see Tomcat started on port(s): 2443 (https)

Test the Deployment Connection

1. $ kubectl port-forward daytrader-gateway-xxxxxxxxx-xxxxx 8888:2443

   This command forwards local port 8888 to port 2443 of your pod

   You should see Forwarding from 127.0.0.1:8888 -> 2443

2. $ curl -k https://127.0.0.1:8888/health

   You should see {"status":"UP"}