如何在kubernetes中使用运行在本地主机上的服务器的端口

Question

我是Kubernetes和kubectl的新手。我基本上是在我的本地主机上运行一个GRPC服务器。我想在我的mac上使用kubectl在kubernetes上运行的spring启动应用程序中使用这个端点。如果我在application.yml中设置以下配置并在kubernetes中运行，它将无法工作。如果我在IDE中运行，也可以使用相同的配置。

grpc:
  client:
    local-server:
      address: static://localhost:6565
      negotiationType: PLAINTEXT

我看到一些人建议使用port-forward，但情况正好相反(当我想从localhost使用kubernetes中已经存在的端口时，它就像tomcat服务器从localhost上的浏览器运行在kubernetes中一样)。

apiVersion: apps/v1
kind: Deployment
metadata: 
  name: testspringconfigvol
  labels:
    app: testspring
spec:
  replicas: 1
  selector:
    matchLabels:
      app: testspringconfigvol
  template:
    metadata:
      labels:
        app: testspringconfigvol
    spec:
      initContainers:
      # taken from https://gist.github.com/tallclair/849601a16cebeee581ef2be50c351841
      # This container clones the desired git repo to the EmptyDir volume.
      - name: git-config
        image: alpine/git # Any image with git will do
        args:
          - clone
          - --single-branch
          - --
          - https://github.com/username/fakeconfig
          - /repo # Put it in the volume
        securityContext:
          runAsUser: 1 # Any non-root user will do. Match to the workload.
          allowPrivilegeEscalation: false
          readOnlyRootFilesystem: true
        volumeMounts:
        - mountPath: /repo
          name: git-config
      containers:
      - name: testspringconfigvol-cont
        image: username/testspring
        ports:
        - containerPort: 8080
        volumeMounts:  
        - mountPath: /usr/local/lib/config/
          name: git-config
      volumes:
        - name: git-config
          emptyDir: {}

简单来说，我需要的是：

端口在我的本地主机中有一些服务器：localhost:6565，localhost:6566，我需要在我的kubernetes中访问这些端口。那么我应该在application.yml配置中设置什么呢？是相同的localhost:6565，localhost:6566还是how-to-get-this-ip:6565，how-to-get-this-ip:6566。

Answer 1

我们可以使用minikube命令minikube ssh "route -n | grep ^0.0.0.0 | awk '{ print \$2 }'"获取vmware主机ip。对我来说，它是Mac上的10.0.2.2。如果在Docker for mac上使用Kubernetes，那么它是host.docker.internal。

通过使用这些命令，我设法从kubernetes连接到主机上运行的服务。

Answer 2

1)在您的application.properties定义中

 server.port=8000

2)创建Dockerfile

# Start with a base image containing Java runtime (mine java 8)
FROM openjdk:8u212-jdk-slim
# Add Maintainer Info
LABEL maintainer="vaquar.khan@gmail.com"
# Add a volume pointing to /tmp
VOLUME /tmp
# Make port 8080 available to the world outside this container
EXPOSE 8080
# The application's jar file (when packaged)
ARG JAR_FILE=target/codestatebkend-0.0.1-SNAPSHOT.jar
# Add the application's jar to the container
ADD ${JAR_FILE} codestatebkend.jar
# Run the jar file 
ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/codestatebkend.jar"]

3)确保docker工作正常

       docker run --rm -p 8080:8080 

4)

• https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/

使用以下命令查找实例名称

 kubectl get pods 

然后

  kubectl port-forward <pod-name> 8080:8080

有用的链接：

• https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/#forward-a-local-port-to-a-port-on-the-pod
• https://kubernetes.io/docs/tasks/administer-cluster/access-cluster-services/#manually-constructing-apiserver-proxy-urls
• https://kubernetes.io/docs/tasks/access-application-cluster/port-forward-access-application-cluster/
• https://developer.okta.com/blog/2019/05/22/java-microservices-spring-boot-spring-cloud