NGINX Ingress 未到达 Service(clusterIP)

问题描述

我正在尝试在 Kubernetes 集群中部署一个节点 js 应用程序。我已经为此创建了 deplyment 和 service(clusterIp) 并在 Nginx 入口配置文件中添加了一个角色，但似乎 Nginx 无法访问该服务。

NodeJs 应用程序：

'use strict';

const express = require('express');

// Constants
const PORT = 5678;
const HOST = '0.0.0.0';

// App
const app = express();
app.get('/',(req,res) => {
  console.log("request received");
  res.send('Hello World');
});

app.listen(PORT,HOST);
console.log(`Running on http://${HOST}:${PORT}`);

Dockerfile：

FROM node:14

# Create app directory
workdir /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
copY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm ci --only=production

# Bundle app source
copY . .

EXPOSE 5678
CMD [ "node","server.js" ]

部署：

apiVersion: apps/v1
kind: Deployment
Metadata:
  name: apple-app-deployment
  labels:
    app: apple
spec:
  replicas: 2
  selector:
    matchLabels:
      app: apple
  template:
    Metadata:
      labels:
        app: apple
    spec:
      containers:
      - name: apple-app
        image: anudcker/node-web-appp:1
        ports:
        - containerPort: 5678

服务：

kind: Service
apiVersion: v1
Metadata:
  name: apple-service
spec:
  selector:
    app: apple
  ports:
    - port: 5678 # Default port for image
      targetPort: 5678

入口：

apiVersion: networking.k8s.io/v1
kind: Ingress
Metadata:
  name: example-ingress
  annotations:
    # kubernetes.io/ingress.class: azure/application-gateway
    ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - http:
      paths:
        - path: /apple
          pathType: Prefix
          backend:
            service:
                name: apple-service
                port:
                    number: 5678

现在每当我尝试通过点击 /apple 来访问服务时，我都会收到响应 Cannot GET /apple 来自 Nginx 入口。我在 Nginx 入口控制器 pod 中发现了波纹管日志。

10.244.1.1 - - [07/May/2021:06:22:29 +0000] "GET /apple HTTP/1.1" 404 144 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML,like Gecko) Chrome/79.0.3945.117 Safari/537.36" 465 0.004 [demo-apple-service-5678] [] 10.244.0.24:5678 144 0.004 404 5a5bdf8f61d59b665218be0a18a6ab4c

有什么想法吗？

解决方法

问题是您使用的是 rewrite-target 的 networking.k8s.io/v1beta1 和 apiVersion: networking.k8s.io/v1。

您需要将注释更新为新注释：

nginx.ingress.kubernetes.io/rewrite-target: /