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K8S多域入口

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0

Fooman · 技术社区 · 7 年前

我想复制一个 Name based virtual hosting 一次部署两个Docker映像。不幸的是,由于端口冲突,我只能运行1:

2019/03/19 20:37:52 [ERR] Error starting server: listen tcp :5678: bind: address already in use

在同一部署中,是否确实不可能在同一端口上侦听两个映像?还是我在别的地方出了错?

最小示例改编自 here

# set up ingress
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/mandatory.yaml

# set up load balancer
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/provider/cloud-generic.yaml

# spin up two containers in one deployment, same container port
kubectl apply -f test.yaml

test.yaml :

apiVersion: v1
kind: Service
metadata:
  name: echo1
spec:
  ports:
    - port: 80
      targetPort: 5678
  selector:
    app: echo1
---
apiVersion: v1
kind: Service
metadata:
  name: echo2
spec:
  ports:
    - port: 80
      targetPort: 5678
  selector:
    app: echo2
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: echo12
spec:
  selector:
    matchLabels:
      app: echo12
  replicas: 1
  template:
    metadata:
      labels:
        app: echo12
    spec:
      containers:
        - name: echo1
          image: hashicorp/http-echo
          args:
            - "-text=echo1"
          ports:
            - containerPort: 5678
        - name: echo2
          image: hashicorp/http-echo
          args:
            - "-text=echo2"
          ports:
            - containerPort: 5678
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: echo-ingress
spec:
  rules:
    - host: echo1.example.com
      http:
        paths:
          - backend:
              serviceName: echo1
              servicePort: 80
    - host: echo2.example.com
      http:
        paths:
          - backend:
              serviceName: echo2
              servicePort: 80

更新: 如果我添加一个单独的部署,它就会工作。这是通过设计还是有任何方法可以在一个部署中实现这一点(原因:我希望能够一次重置所有已部署的域)?

0 回复 | 直到 7 年前

1

2

Frank Yucheng Gu 7 年前

问题1 :在一个部署的一个POD中创建两个不同的服务后端。这不是吊舱的设计目的。如果您想要公开多个服务,那么应该有一个POD(至少)来支持每个服务。通过允许您定义复制和活跃选项,部署围绕POD进行。在您的案例中,您应该有一个部署(它创建一个或多个将响应一个echo请求的pods)用于对应的服务。

问题2 :您的服务没有正确链接到后端。服务显然是想选择一个标签 app=echo 或 app=echo2 . 在您的部署中, app=echo12 . 因此,服务根本找不到任何活动端点。

要解决上述问题,请尝试以下操作:

apiVersion: v1
kind: Service
metadata:
  name: echo1
spec:
  ports:
    - port: 80
      targetPort: 5678
  selector:
    app: echo1
---
apiVersion: v1
kind: Service
metadata:
  name: echo2
spec:
  ports:
    - port: 80
      targetPort: 5678
  selector:
    app: echo2
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: echo1
spec:
  selector:
    matchLabels:
      app: echo1
  replicas: 1
  template:
    metadata:
      labels:
        app: echo1
    spec:
      containers:
        - name: echo1
          image: hashicorp/http-echo
          args:
            - "-text=echo1"
          ports:
            - containerPort: 5678
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: echo2
spec:
  selector:
    matchLabels:
      app: echo2
  replicas: 1
  template:
    metadata:
      labels:
        app: echo2
    spec:
      containers:
        - name: echo2
          image: hashicorp/http-echo
          args:
            - "-text=echo2"
          ports:
            - containerPort: 5678
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: echo-ingress
spec:
  rules:
    - host: echo1.example.com
      http:
        paths:
          - backend:
              serviceName: echo1
              servicePort: 80
    - host: echo2.example.com
      http:
        paths:
          - backend:
              serviceName: echo2
              servicePort: 80

我已经在自己的集群中测试了上面的内容,并验证了它是否正常工作(当然是使用不同的入口URL)。希望这有帮助!