【发布时间】：2019-04-29 21:25:04
【问题描述】：
我的 Heroku 应用程序启动并运行良好，直到我尝试执行与其数据库交互的任何操作，此时我收到“503- 服务不可用”错误。
我已经在我的资源选项卡中安装了 mLab 插件，并在我的设置选项卡的 config vars 部分中添加了正确的 MONGODB_URI 连接字符串，但我不确定这两者是否是多余的。
当我使用 localhost 启动应用程序时，它运行良好，但我注意到它仍在使用我的本地数据库而不是 mLab 数据库。
这是我的 server.js 文件：
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
app.set('port', (process.env.PORT || 5000));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended : true}))
var path = require('path');
app.use(express.static(path.join(__dirname, './dist/public/')));
app.get('*', function(req,res){
res.sendFile(path.join(__dirname, 'dist'));
});
require('./server/config/mongoose.js');
var mongodb = require('mongodb');
var MongoClient = mongodb.MongoClient;
var url = process.env.MONGOLAB_URI;
MongoClient.connect(url, function (err, db) {
if (err) {
console.log('Unable to connect to the mongoDB server. Error:', err);
} else {
console.log('Connection established to', url);
};
var routes_setter = require('./server/config/routes.js');
routes_setter(app);
app.listen(app.get('port'), function(){
console.log('Node app is running on port', app.get('port'))
});
})
这是我的 package.json：
{
"name": "public",
"version": "0.0.0",
"main": "server.js",
"scripts": {
"nodemon": "nodemon server.js",
"ng": "ng",
"start": "node server.js",
"build": "ng build",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e",
"postinstall": "ng build --aot -prod"
},
"repository": {
"type": "git",
"url": "https://github.com/ActionPackedJack/Restaurant-Schedule"
},
"engines": {
"node": "11.2.0",
"npm": "6.4.1"
},
"dependencies": {
"@angular/animations": "^6.0.3",
"@angular/cli": "~6.0.8",
"@angular/common": "^6.0.3",
"@angular/compiler": "^6.0.3",
"@angular/compiler-cli": "^6.0.3",
"@angular/core": "^6.0.3",
"@angular/forms": "^6.0.3",
"@angular/http": "^6.0.3",
"@angular/platform-browser": "^6.0.3",
"@angular/platform-browser-dynamic": "^6.0.3",
"@angular/router": "^6.0.3",
"body-parser": "^1.18.3",
"core-js": "^2.5.4",
"express": "^4.16.4",
"mongodb": "^3.1.10",
"mongoose": "^5.3.12",
"nodemon": "^1.18.6",
"rxjs": "^6.0.0",
"rxjs-compat": "^6.3.3",
"typescript": "~2.7.2",
"zone.js": "^0.8.26"
},
"devDependencies": {
"@angular/cli": "~6.0.8",
"@angular/compiler-cli": "^6.0.3",
"@angular-devkit/build-angular": "~0.6.8",
"@angular/language-service": "^6.0.3",
"@types/jasmine": "~2.8.6",
"@types/jasminewd2": "~2.0.3",
"@types/node": "~8.9.4",
"codelyzer": "~4.2.1",
"typescript": "~2.7.2",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~1.7.1",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.0",
"karma-jasmine": "~1.1.1",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.3.0",
"ts-node": "~5.0.1",
"tslint": "~5.9.1"
}
}
任何建议将不胜感激。非常感谢！
【问题讨论】：
-
你正在尝试连接到 url "process.env.MONGOLAB_URI" 并且你提到你已经设置了 "MONGODB_URI" 环境变量，你能检查一下吗？
-
@Vishal-Lia 哦，不错。虽然解决了这个问题，但推送我的更改并重新启动应用程序仍然会给我 503 错误。我还应该提到，当我在本地运行应用程序时，即使它可以工作，但当我启动它时，它会显示“无法连接到 mongoDB 服务器。错误：URL 格式错误，无法解析”
-
只要确保URL正确，包括mlab db的用户名和密码。
-
是的，它就在那里，将
和 替换为适当的用户名和密码。
标签： node.js angular mongodb heroku mlab