kubernetes - 如何通过Kubernetes服务(如网关API)路由到特定的Pod

Question

我在Windows的“Docker table 面”上运行Kubernetes。

我有一个具有3个副本的部署的LoadBalancer服务。
我想通过某种方式(例如通过URL路径: :8090/pod1)访问SPECIFIC pod。

有什么办法可以实现这个用例？

deployment.yaml:

apiVersion: v1
kind: Service
metadata:
  name: my-service1
  labels:
    app: stream
spec:
  ports:
  - port: 8090
    targetPort: 8090
    name: port8090
  selector:
    app: stream
  # clusterIP: None
  type: LoadBalancer
---
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: stream-deployment
  labels:
    app: stream
spec:
  replicas: 3
  selector:
    matchLabels:
      app: stream
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: stream
    spec:
      containers:
      - image: stream-server-mock:latest
        name: stream-server-mock
        imagePullPolicy: Never
        env:
        - name: STREAMER_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        - name: STREAMER_ADDRESS
          value: stream-server-mock:8090
        ports:
        - containerPort: 8090

我的最终目标是实现 pods 的水平自动缩放。

应用程序的设计和工作方式(无kubernetes):

There are 3 components : REST-Server, Stream-Server (3 instances locally on different JVM on different ports), and RabbitMQ.

1 - The client sends a request to "REST-Server" for a stream url.
2 - The REST-Server puts in the RabbitMQ queue.
3 - One of the Stream-Server picks it up and populates its IP and sends back to REST-Server through RabbitMQ.
4 - The client receives the IP and establishes a direct WS connection using the IP.

我面临的问题是:

1 - When the client requests for a stream IP, one of the pods (lets say POD1) picks it up and sends its URL (which is service URL, comes through LoadBalancer Service).
2 - Next time when the client tries to connect (WebSocket Connection) using the Service IP, it wont be the same pod which accepted the request.

它应该是接受请求的同一pod，并且必须可由客户端访问。

Answer 1

如果不需要使用部署，则可以使用StatefulSets。

对于副本3，您将有3个名为

流部署-0

流部署1

流部署2

您可以通过 $(podname).$(service name).$(namespace).svc.cluster.local访问每个 pods

有关详细信息，请检查 this

您可能还需要设置一个入口，以从集群外部指向每个 pods 。