通过一个IP(主节点)访问Kubernetes服务

本文介绍了通过一个IP(主节点)访问Kubernetes服务的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个Kubernetes集群安装，在centos 7机器(内部环境)中有一个主节点和两个工作节点.是否可以通过主节点的ip访问将在Kubernetes上安装的所有已部署服务(内置和我的微服务)?

I have a Kubernetes cluster installation with a master node and two worker nodes in centos 7 machine(On premise environment). Is there a way to access all deployed services(Built in and my micro service) that will be installed on Kubernetes through master node's ip?

我用过法兰绒网络.我的服务正在节点端口30011上运行.我可以从辅助节点ip和节点端口[192.23.12.X1:30011和192.23.12.X2:30011]端口访问我的服务，但无法访问同一端口主节点提供服务[192.23.19.21:30011].

I have used flannel network. My service is running on node port 30011. I am able to access my service from worker node ip and node port[192.23.12.X1:30011 and 192.23.12.X2:30011] port but I am not able to access the same service from master node[192.23.19.21:30011].

这是我的部署和服务Yaml文件

Here is my deployment and service yaml file

deployment.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: am-profile
  labels:
    app: am-profile
spec:
  replicas: 1
  selector:
    matchLabels:
      app: am-profile
  template:
    metadata:
      labels:
        app: am-profile
    spec:
      containers:
      - name: am-profile
        image: 192.23.12.160:8083/am-setting:1.0.0
        ports:
        - containerPort: 8081

service.yaml

apiVersion: v1
kind: Service
metadata:
  name: am-profile
  labels:
    app: am-profile
spec:
  type: NodePort
  ports:
   - targetPort: 8081
     port: 8081
     nodePort: 30011
  selector:
     app: am-profile

我想访问此服务，例如 http://master-node:30011/hello .感谢您的帮助.

I want to access this service like http://master-node:30011/hello.Every help is appreciated.

这是IP表保存了

-A KUBE-NODEPORTS -p tcp -m comment --comment "default/subscriber-profile-service:" -m tcp --dport 30002 -j KUBE-MARK-MASQ
-A KUBE-NODEPORTS -p tcp -m comment --comment "default/subscriber-profile-service:" -m tcp --dport 30002 -j KUBE-SVC-IUSISESM6NEI4T53
-A KUBE-SERVICES ! -s 10.244.0.0/16 -d 10.107.113.5/32 -p tcp -m comment --comment "default/subscriber-profile-service: cluster IP" -m tcp --dport 8082 -j KUBE-MARK-MASQ
-A KUBE-SERVICES -d 10.107.113.5/32 -p tcp -m comment --comment "default/subscriber-profile-service: cluster IP" -m tcp --dport 8082 -j KUBE-SVC-IUSISESM6NEI4T53 [r –

推荐答案

如果Kubernetes群集没有网络问题，则可以使用群集的任何节点(包括主节点)访问NodePort服务.

If Kubernetes cluster has no network issues, you are able to access NodePort service using any node of the cluster including master node(s).

默认情况下，kube-proxy窗格创建ip-tables规则以将流量从NodeIP:NodePort转发到特定的pod:port.您可以通过在每个节点上运行以下命令来检查现有的ip-tables规则:

By default, kube-proxy pods create ip-tables rules to forward traffic from NodeIP:NodePort to specific pod:port. You can check existing ip-tables rules by running the following command on each node:

$ sudo iptables-save
# you may need to install iptables package to use this command
# yum -y install iptables

-A KUBE-NODEPORT ... -j KUBE-SVC-... # shows you port number on the node
-A KUBE-SVC-... -j KUBE-SEP-... # shows you destination rules links and balancing
-A KUBE-SEP-... ... -j DNAT --to-destination <pod-ip:port> # shows you destination for traffic that comes to NodePort

如果所有提及的规则均已到位，请检查从主节点到节点的连通性:

If all mentioned rules are in place, check the connectivity from master to node:

master-node$> curl http://<pod-ip>:<port>/path-if-needed/

如果检查失败并出现连接错误，请检查以下内容:

In case that check fails with a connection error, check the following:

是否存在可能会降低流量的自定义防火墙或Firewalld规则?
云VPC安全性是否允许节点之间的流量?
网络解决方案(绒布，印花棉布等)是否已安装且正常工作?
是否已启用SELinux?

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