AWS Elastic Beanstalk / NodeJS / Nginx 错误：不断收到 502 bad gateway

Question

我已经多次部署了我的网络应用程序，并且运行良好。

但自昨天部署以来，每当我尝试获取我的网站时，我都会不断收到 502 Bad Gateway。

我从 AWS elastic beanstalk 中终止了我的应用程序并重新创建，但仍然收到 502 bad gateway。

这是我的 nodejs.log：

Error: ENOENT: no such file or directory, open '/var/app/current/config/awsconfig.json'
    at Error (native)
    at Object.fs.openSync (fs.js:642:18)
    at Object.fs.readFileSync (fs.js:510:33)
    at Object.readFileSync (/var/app/current/node_modules/aws-sdk/lib/util.js:97:26)
    at Config.loadFromPath (/var/app/current/node_modules/aws-sdk/lib/config.js:409:39)
    at Object.<anonymous> (/var/app/current/server.js:14:12)
    at Module._compile (module.js:577:32)
    at Object.Module._extensions..js (module.js:586:10)
    at Module.load (module.js:494:32)
    at tryModuleLoad (module.js:453:12)
fs.js:642
  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);

这是我 server.js 中与 nodejs 错误日志相关的部分：

const express = require("express");
const path = require("path");
const fs = require("fs");
const template = require("./public/template");
const bodyParser = require("body-parser");
const _ = require("lodash");
const uuidv1 = require("uuid/v1");

const AWS = require("aws-sdk");
const multer = require("multer");
const multerS3 = require("multer-s3");

// Image Upload
AWS.config.loadFromPath(path.join(__dirname, "/config/awsconfig.json"));
const s3 = new AWS.S3();
const upload = multer({
  storage: multerS3({
    s3,
    bucket: "hackingdeal",
    key: (req, file, cb) => {
      cb(null, new Date().valueOf() + path.extname(file.originalname));
    },
    acl: "public-read-write"
  })
});

仅供参考，“server.js”文件位于根目录（“./server.js”），awsconfig.json 位于“./config/awsconfig.json”

我创建了一个 .gitignore 来忽略“config/awsconfig.json”。 我还创建了一个 .ebignore，但我没有包含“config/awsconfig.json”，因此我的弹性 beanstalk 可以找到并读取“config/awsconfig.json”文件。

这是我的 nginx/error.log：

2018/10/20 23:32:05 [error] 8103#0: *96 connect() failed (111: Connection refused) while connecting to upstream, client: 110.12.50.169, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8081/", host: "hackingdeal-env.4wgwkb9tdv.ap-northeast-2.elasticbeanstalk.com"
2018/10/20 23:32:05 [error] 8103#0: *96 connect() failed (111: Connection refused) while connecting to upstream, client: 110.12.50.169, server: , request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:8081/favicon.ico", host: "hackingdeal-env.4wgwkb9tdv.ap-northeast-2.elasticbeanstalk.com", referrer: "http://hackingdeal-env.4wgwkb9tdv.ap-northeast-2.elasticbeanstalk.com/"
2018/10/20 23:48:00 [error] 12936#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 110.12.50.169, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8081/", host: "hackingdeal.com"
2018/10/20 23:48:01 [error] 12936#0: *1 connect() failed (111: Connection refused) while connecting to upstream, client: 110.12.50.169, server: , request: "GET /favicon.ico HTTP/1.1", upstream: "http://127.0.0.1:8081/favicon.ico", host: "hackingdeal.com", referrer: "http://hackingdeal.com/"

hackingdeal.com 是我的网站。我使用 Route53 服务将该域连接到我的 Elastic Beanstalk，并设置了别名。

问题是， 我的应用程序在 localhost 上成功运行。

当我使用图像上传语句部署“server.js”后，我的应用程序立即成功运行（使用 AWS S3 和 multer/multerS3 的东西：参见上面的代码块”

但从昨天开始，它一直返回 502 bad gateway。

我完全迷失了，我不知道从哪里开始，或者在哪里找到我的问题。 请帮忙..

Answer 1

我必须阅读日志才能更好地了解您的问题，但您似乎尝试从此处的文件 /config/awsconfig.json 加载配置

// Image Upload
AWS.config.loadFromPath(path.join(__dirname, "/config/awsconfig.json"));
const s3 = new AWS.S3();
const upload = multer({
  storage: multerS3({
    s3,
    bucket: "hackingdeal",
    key: (req, file, cb) => {
      cb(null, new Date().valueOf() + path.extname(file.originalname));
    },
    acl: "public-read-write"
  })
});

因此，您必须将此文件上传到您的 ELB。其实这就是nodejs.log登录的问题