如何使用訊息佇列、Spring Boot和Kubernetes擴充套件微服務

@Component
public class QueueService implements MessageListener {
private static final Logger LOGGER = LoggerFactory.getLogger(QueueService.class);
@Autowired
  private JmsTemplate jmsTemplate;
  public void send(String destination, String message) {
    LOGGER.info("sending message='{}' to destination='{}'", message, destination);
    jmsTemplate.convertAndSend(destination, message);
  }
@Override
  public void onMessage(Message message) {
    if (message instanceof ActiveMQTextMessage) {
      ActiveMQTextMessage textMessage = (ActiveMQTextMessage) message;
      try {
        LOGGER.info("Processing task " + textMessage.getText());
        Thread.sleep(5000);
        LOGGER.info("Completed task " + textMessage.getText());
      } catch (InterruptedException e) {
        e.printStackTrace();
      } catch (JMSException e) {
        e.printStackTrace();
      }
    } else {
      LOGGER.error("Message is not a text message " + message.toString());
    }
  }
}

@SpringBootApplication
@EnableJms
public class SpringBootApplication implements JmsListenerConfigurer {
  @Autowired
  private QueueService queueService;
public static void main(String[] args) {
    SpringApplication.run(SpringBootApplication.class, args);
  }
@Override
  public void configureJmsListeners(JmsListenerEndpointRegistrar registrar) {
    SimpleJmsListenerEndpoint endpoint = new SimpleJmsListenerEndpoint();
    endpoint.setId("myId");
    endpoint.setDestination("queueName");
    endpoint.setMessageListener(queueService);
    registrar.registerEndpoint(endpoint);
  }
}

minikube start \
  --memory 8096 \
  --extra-config=controller-manager.horizontal-pod-autoscaler-upscale-delay=1m \
  --extra-config=controller-manager.horizontal-pod-autoscaler-downscale-delay=2m \
  --extra-config=controller-manager.horizontal-pod-autoscaler-sync-period=10s

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: queue
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: queue
    spec:
      containers:
      - name: web
        image: webcenter/activemq:5.14.3
        imagePullPolicy: IfNotPresent
        ports:
          - containerPort: 61616
        resources:
          limits:
            memory: 512Mi

apiVersion: v1
kind: Service
metadata:
  name: queue
spec:
  ports:
  - port: 61616 
    targetPort: 61616
  selector:
    app: queue

kubectl create -f activemq-deployment.yaml
kubectl create -f activemq-service.yaml

kubectl get pods -l=app=queue

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: frontend
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: frontend
        image: spring-boot-hpa
        imagePullPolicy: IfNotPresent
        env:
        - name: ACTIVEMQ_BROKER_URL
          value: "tcp://queue:61616"
        - name: STORE_ENABLED
          value: "true"
        - name: WORKER_ENABLED
          value: "false"
        ports:
        - containerPort: 8080
        livenessProbe:
          initialDelaySeconds: 5
          periodSeconds: 5
          httpGet:
            path: /health
            port: 8080
        resources:
          limits:
            memory: 512Mi

apiVersion: v1
kind: Service
metadata:
  name: frontend
spec:
  ports:
  - nodePort: 32000
    port: 80
    targetPort: 8080
  selector:
    app: frontend
  type: NodePort

kubectl create -f fe-deployment.yaml
kubectl create -f fe-service.yaml

kubectl get pods -l=app=frontend

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: backend
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: backend
      annotations:
        prometheus.io/scrape: 'true'
    spec:
      containers:
      - name: backend
        image: spring-boot-hpa
        imagePullPolicy: IfNotPresent
        env:
        - name: ACTIVEMQ_BROKER_URL
          value: "tcp://queue:61616"
        - name: STORE_ENABLED
          value: "false"
        - name: WORKER_ENABLED
          value: "true"
        ports:
        - containerPort: 8080
        livenessProbe:
          initialDelaySeconds: 5
          periodSeconds: 5
          httpGet:
            path: /health
            port: 8080
        resources:
          limits:
            memory: 512Mi

apiVersion: v1
kind: Service
metadata:
  name: backend
  spec:
    ports:
    - nodePort: 31000
      port: 80
      targetPort: 8080
    selector:
      app: backend
    type: NodePort

kubectl create -f backend-deployment.yaml
kubectl create -f backend-service.yaml

kubectl get pods -l=app=backend

# HELP messages Number of messages in the queue
# TYPE messages gauge
messages 0

kubectl create -f ./metrics-server
kubectl create -f ./namespaces.yaml
kubectl create -f ./prometheus
kubectl create -f ./custom-metrics-api

kubectl get --raw "/apis/custom.metrics.k8s.io/v1beta1/namespaces/default/pods/*/messages" | jq .

apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
  name: spring-boot-hpa
spec:
  scaleTargetRef:
    apiVersion: extensions/v1beta1
    kind: Deployment
    name: backend 
  minReplicas: 1
  maxReplicas: 10
  metrics:
  - type: Pods
    pods:
      metricName: messages
      targetAverageValue: 10