具有多个容器的 pod 上具有多个公开端口的单个服务

Question

我已经让多个容器在同一个 pod 中工作。

 kubectl apply  -f myymlpod.yml

kubectl expose pod mypod --name=myname-pod --port 8855 --type=NodePort

然后我可以测试 "expose"

minikube service list

..

|-------------|-------------------------|-----------------------------|
|  NAMESPACE  |          NAME           |             URL             |
|-------------|-------------------------|-----------------------------|
| default     | kubernetes              | No node port                |
| default     | myname-pod              | http://192.168.99.100:30036 |
| kube-system | kube-dns                | No node port                |
| kube-system | kubernetes-dashboard    | No node port                |
|-------------|-------------------------|-----------------------------|

现在，我的 myymlpod.yml 中有多个容器。一个容器在 8855 上有一项服务运行，在 8877 上有一个服务。

下面的文章~提示~我需要做什么。

https://www.mirantis.com/blog/multi-container-pods-and-container-communication-in-kubernetes/

Exposing multiple containers in a Pod

While this example shows how to use a single container to access other containers in the pod, it’s quite common for several containers in a Pod to listen on different ports — all of which need to be exposed. To make this happen, you can either create a single service with multiple exposed ports, or you can create a single service for every poirt you’re trying to expose.

"create a single service with multiple exposed ports"

我找不到关于如何实际执行此操作的任何信息，公开多个端口。

如何在单个服务上公开多个端口？

谢谢。

追加：

K8Containers.yml（下）

apiVersion: v1
kind: Pod
metadata:
  name: mypodkindmetadataname
  labels:
    example: mylabelname

spec:

  containers:

  - name: containername-springbootfrontend
    image: mydocker.com/webfrontendspringboot:latest 
    resources:
      limits:
        memory: "800Mi"
        cpu: "800m" 
      requests:
        memory: "612Mi"
        cpu: "400m"
    ports:
      - containerPort: 8877


  - name: containername-businessservicesspringboot
    image: mydocker.com/businessservicesspringboot:latest
    resources:
      limits:
        memory: "800Mi"
        cpu: "800m" 
      requests:
        memory: "613Mi"
        cpu: "400m" 
    ports:
      - containerPort: 8855

kubectl apply  -f K8containers.yml
pod "mypodkindmetadataname" created

kubectl get pods
NAME                    READY     STATUS    RESTARTS   AGE
mypodkindmetadataname   2/2       Running   0          11s

k8services.yml（下）

apiVersion: v1
kind: Service
metadata: 
  name: myymlservice
  labels: 
    name: myservicemetadatalabel
spec: 
  type: NodePort
  ports:
  - name: myrestservice-servicekind-port-name
    port: 8857
    targetPort: 8855
  - name: myfrontend-servicekind-port-name
    port: 8879
    targetPort: 8877
  selector: 
    name: mypodkindmetadataname

.......

kubectl apply  -f K8services.yml
service "myymlservice" created

.......

 minikube service myymlservice --url
http://192.168.99.100:30784
http://192.168.99.100:31751

.......

 kubectl describe service myymlservice


Name:                     myymlservice
Namespace:                default
Labels:                   name=myservicemetadatalabel
Annotations:              kubectl.kubernetes.io/last-applied-configuration={"apiVersion":"v1","kind":"Service","metadata":{"annotations":{},"labels":{"name":"myservicemetadatalabel"},"name":"myymlservice","namespace":"default"...
Selector:                 name=mypodkindmetadataname
Type:                     NodePort
IP:                       10.107.75.205
Port:                     myrestservice-servicekind-port-name  8857/TCP
TargetPort:               8855/TCP
NodePort:                 myrestservice-servicekind-port-name  30784/TCP
Endpoints:                <none>
Port:                     myfrontend-servicekind-port-name  8879/TCP
TargetPort:               8877/TCP
NodePort:                 myfrontend-servicekind-port-name  31751/TCP
Endpoints:                <none>
Session Affinity:         None
External Traffic Policy:  Cluster
Events:                   <none>

.....

不幸的是，当我尝试调用 "exposed" 项时它仍然无法正常工作。

打电话

http://192.168.99.100:30784/myrestmethod

不起作用

并打电话

http://192.168.99.100:31751

或

http://192.168.99.100:31751/index.html

不起作用

有人看到我遗漏了什么。

APPEND（正在处理）

选择器在 "name" 上不匹配，它在标签上匹配。

k8containers.yml（部分在顶部）

apiVersion: v1
kind: Pod
metadata:
  name: mypodkindmetadataname
  labels:
    myexamplelabelone: mylabelonevalue
    myexamplelabeltwo: mylabeltwovalue

spec:

  containers:

  # Main application container
  - name: containername-springbootfrontend
    image: mydocker.com/webfrontendspringboot:latest 
    resources:
      limits:
        memory: "800Mi"
        cpu: "800m" 
      requests:
        memory: "612Mi"
        cpu: "400m"
    ports:
      - containerPort: 8877


  - name: containername-businessservicesspringboot
    image: mydocker.com/businessservicesspringboot:latest
    resources:
      limits:
        memory: "800Mi"
        cpu: "800m" 
      requests:
        memory: "613Mi"
        cpu: "400m" 
    ports:
      - containerPort: 8855

k8services.yml

apiVersion: v1
kind: Service
metadata: 
  name: myymlservice
  labels: 
    name: myservicemetadatalabel
spec: 
  type: NodePort
  ports:
  - name: myrestservice-servicekind-port-name
    port: 8857
    targetPort: 8855
  - name: myfrontend-servicekind-port-name
    port: 8879
    targetPort: 8877
  selector: 
    myexamplelabelone: mylabelonevalue
    myexamplelabeltwo: mylabeltwovalue

Answer 1

是的，您可以创建一个打开多个端口的单一服务或指向容器端口的服务端口连接。

kind: Service
apiVersion: v1
metadata:
  name: mymlservice
spec:
  selector:
    app: mymlapp
  ports:
  - name: servicename-1
    port: 4444
    targetPort: 8855
  - name: servicename-2
    port: 80
    targetPort: 8877

目标端口在何处连接到您的容器端口。

具有多个容器的 pod 上具有多个公开端口的单个服务

single service with multiple exposed ports on a pod with multiple containers

docker

kubernetes

kubernetes-pod

Exposing multiple containers in a Pod