Question

我想在Cloud Foundry上部署Node.JS应用程序。我按照以下步骤操作：

在package.json

中添加引擎部分

{
  "name": "vsapc",
  "version": "1.0.0",
  "description": "Application Name",
  "main": "server/app.js",
  "scripts": {
    "start": "node server/app.js",
    "backup": "node backup.js",
    "restore": "node restore.js",
    "seed": "node server/seed/Seed.js",
    "postinstall": "node install.js"
  },
  "directories": {
    "test": "test"
  },
  "dependencies": {
    "bcrypt-nodejs": "0.0.3",
    "body-parser": "^1.15.2",
  "cfenv": "^1.0.3",
    "express": "^4.14.0",
    "jsonwebtoken": "^7.1.9",
    "mongodb": "^2.2.5",
    "mongoose": "^4.6.3",
    "mongoose-seed": "^0.3.1",
    "morgan": "^1.7.0",
    "promise": "^7.1.1",
    "prompt": "^1.0.0",
    "winston": "^2.2.0",
    "winston-daily-rotate-file": "^1.4.0"
  },
  "engines": {
  "node": "6.11.*",
  "npm": "5.*"
  },
  "author": "",
  "license": "ISC"
}

我创建了manifest.yml

---
applications:
- name: Policy_Studio
  memory: 2048MB

  env:
    NODE_ENV: production

我使用以下内容连接install.js：

const vcapServices = JSON.parse(process.env.VCAP_SERVICES);
            let mongoUrl = '';
            mongoUrl = vcapServices.mongodb[0].credentials.uri;

            mongoose.connect(mongoUrl,{useMongoClient: true}, function (err){
              if (err) {
                  console.log("Database connection responded with: " + err.message);
                  console.log("Is your server.config.json up to date?");
                  process.exit(1);
                  return
              }
              console.log("Connected to database.");

以及app.js中的以下内容：

Server.prototype.connectDatabase = function (url) {
          mongoose.Promise = Promise;
          const vcapServices = JSON.parse(process.env.VCAP_SERVICES);
          let mongoUrl = '';
          mongoUrl = vcapServices.mongodb[0].credentials.uri;
          mongoose.connect(mongoUrl,{useMongoClient: true});
          mongoose.connection.on("error", function (err) {
              log.error(err)
          });
          mongoose.connection.once("openUri", function () {
              log.info("Connected to DB")
          })
      };

通过命令行连接到SCAPP并使用cf push
由于我没有云上的MongoDB，我有一个错误
我在云上构建MOngoDB服务并通过Web GUI直接绑定应用
点击gui i点击我的应用的停用按钮
我有错误

Database connection responded with: failed to connect to server 
[2xtorvw9ys7tg9pc.service.consul:49642] on first connect [MongoError: 
connect ECONNREFUSED 10.98.250.54:49642]

我在清单中添加了服务mongoDB，并推送了我的应用程序
与第9点
我尝试更改install.js

感谢您的帮助

Answer 1

虽然解析VCAP_SERVICES似乎有效（你得到一个包含主机名和端口的URL），但我强烈建议将其中一个现有库用于进一步的项目： https://www.npmjs.com/package/cfenv

仍然请解析您的mongo凭据正常工作（cf e ${app_name}，查找VCAP_SERVICES，手动比较）

如果您想使用独立代码测试您的服务，这里有一个示例应用程序，我很快就会一起测试绑定到它的所有mongodb服务：

的package.json：

{
  "name": "mongo-tester",
  "version": "1.0.0",
  "description": "tests all mongodbs via VCAP_SERVICES",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Michael Erne",
  "license": "MIT",
  "dependencies": {
    "async": "^2.5.0",
    "cfenv": "^1.0.4",
    "lodash": "^4.17.4",
    "mongodb": "^2.2.31"
  }
}

server.js：

var cfenv = require('cfenv'),
    _ = require('lodash'),
    http = require('http'),
    async = require('async'),
    MongoClient = require('mongodb').MongoClient


var appEnv = cfenv.getAppEnv();

http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Return something for CF Health Check\n');
}).listen(appEnv.port);

var services = _.values(appEnv.getServices());
var mongodbs = _.filter(services, { label: 'mongodb' });

async.eachLimit(mongodbs, 1, function (m, callback) {
  MongoClient.connect(m.credentials.database_uri, function (err, db) {
    if (err) {
      return callback(err);
    }
    db.collection("debug").insertOne({"test": true}, function(err, res) {
      if (err) return callback(err);
      console.log("document inserted successfully into " + m.credentials.database_uri);
      db.close();
      return callback(null);
    });
  });
}, function (err) {
    if (err) {
      console.log(err.stack || err);
      console.log('---> mongodb connection failed <---');
      return;
    }
    console.log('---> connection to all BOUND mongodb successful <---');
});

如果它可以连接到任何绑定的mongodb服务，它应该在其日志中打印如下内容：

document inserted successfully into mongodb://xxx:yyy@zzz.service.consul:1337/databaseName
---> connection to all BOUND mongodb successful <---

如果失败并出现类似错误，则服务实例似乎已损坏（报告错误的URL /端口）。在这种情况下，我只是重新创建服务实例，然后再试一次。

Answer 2

最后我们找到了问题。云代工厂不允许在安装后阶段访问MongoDB服务。所以我们将它改为预启动并且有效。谢谢你的帮助

Cloud Foundry MongoDB错误ECONNREFUSED

2 个答案: