Kubernetes Nginx Ingress和Socket.io连接问题

Question

我的react应用程序与nodejs socket.io应用程序聊天时遇到问题。

然而，我已经缩小了范围，认为这是一个入口错误配置。端口转发socket.io nodejs pod并通过127.0.0.1:3020与react连接工作正常。

Socket.io部署文件

apiVersion: apps/v1
kind: Deployment
metadata:
name: websockettest-deployment
spec:
replicas: 1
selector:
matchLabels:
component: websockettest
template:
metadata:
labels:
component: websockettest
spec:
containers:
- name: websockettest
image: websockettest
imagePullPolicy: IfNotPresent
ports:
- containerPort: 3020

套接字IO服务配置

apiVersion: v1
kind: Service
metadata:
name: websockettest-cluster-ip-service
spec:
type: ClusterIP
selector:
component: websockettest
ports:
- port: 3020
targetPort: 3020

入口配置

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ingress-service
annotations:
kubernetes.io/ingress.class: nginx
nginx.org/websocket-services: websockettest-cluster-ip-service
spec:
rules:
- http:
paths:
- path: /websockettest/?(.*)
backend:
serviceName: websockettest-cluster-ip-service
servicePort: 3020

Nodejs Socket.io

const http = require('http');
const express = require('express');
var app = express();
var server = http.createServer(app);
var io = require('socket.io')(server);
io.set("transports", ["websocket"]);
io.on('connection', function (socket) {
console.log('connected socket!');
socket.on('greet', function (data) {
console.log(data);
socket.emit('respond', { hello: 'Hello' });
});
socket.on('disconnect', function () {
console.log('Socket disconnected');
});
});
const port = process.env.PORT || 3020;
server.listen(port, () => {
console.log(`Server is up on port ${port}`);
});

React Socket.io客户端

// Various Attempts:
// websockettest
// websockettest-cluster-ip-service
// http://192.168.64.11:3020
// :3020/websockettest
// 127.0.0.1:3020 - port forwarding works
const socket = io('192.168.64.11/websockettest', {
'reconnection': false, 
transports: ['websocket']
});

Answer 1

Socket.io有一个用于websocket通信的特定路径。因此，kubernetes入口需要配置为支持"/socket.io"。此外，node.js中间件还需要为套接字端点提供自定义命名空间。

入口ws服务.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ingress-ws-service
annotations:
nginx.ingress.kubernetes.io/use-regex: "true"
nginx.org/websocket-services: "websockettest-cluster-ip-service"
spec:
rules:
- http:
paths:
- path: /websockettest/.*
backend:
serviceName: websockettest-cluster-ip-service
servicePort: 3020
- path: /socket.io/.*
backend:
serviceName: websockettest-cluster-ip-service
servicePort: 3020

Nodejs Socket.io

const http = require('http');
const express = require('express');
var app = express();
var server = http.createServer(app);
var io = require('socket.io')(server);
const nsp = io.of("/websockettest");
nsp.on('connection', function (socket) {
console.log('connected socket!');
socket.on('greet', function (data) {
console.log(data);
nsp.emit('respond', { hello: 'Hello' });
});
socket.on('disconnect', function () {
console.log('Socket disconnected');
});
});
const port = process.env.PORT || 3020;
server.listen(port, () => {
console.log(`Server is up on port ${port}`);
});

React客户端

const socket = io('/websockettest', {
'reconnection': true, 
transports: ['websocket']
});

Answer 2

将此nginx入口，在网络负载均衡器中工作以连接websocket