Cloud Foundry MongoDB Error ECONNREFUSED - node.js

Question

I would like to deploy a Node.JS app on Cloud Foundry.
I follow the following steps:
Add the engines part in the package.json
{
"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"
}
I create the manifest.yml
---
applications:
- name: Policy_Studio
memory: 2048MB
env:
NODE_ENV: production
I used the following to connect in 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.");
and the following in app.js:
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")
})
};
connect by command line to SCAPP and push the app with cf push
As i don't have the MongoDB on the cloud i have an error
I build a MOngoDB service on the cloud and bind directly the app through the web GUI
On the gui i click restage button for my app
I have the error
Database connection responded with: failed to connect to server
[2xtorvw9ys7tg9pc.service.consul:49642] on first connect [MongoError:
connect ECONNREFUSED 10.98.250.54:49642]
I add the service mongoDB in my manifest and cf push my application
Still the same error as in point 9
I tried to change the connection in install.js
Thank you for your help

Answer 1

While your parsing of VCAP_SERVICES appears to work (you get a URL containing a hostname & port), i highly recommend to leverage one of the existing libraries for it for further projects:
https://www.npmjs.com/package/cfenv
Still, please that the parsing of your mongo credentials is properly working (cf e ${app_name}, look for VCAP_SERVICES, manually compare)
If you want to test your service with independent code, here is a sample app i quickly threw together to test all mongodb services bound to it:
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 <---');
});
It should print something like the following in its logs if it can connect to any of the bound mongodb services:
document inserted successfully into mongodb://xxx:yyy#zzz.service.consul:1337/databaseName
---> connection to all BOUND mongodb successful <---
If this fails with similar errors, the service instance seems broken (wrong url/port being reported). I would just recreate the service instance in that case and try again.

Answer 2

Finally we have found the problem. The cloud foundry is not allowing to access the MongoDB service during the postinstall phase. So we changed it to prestart and it worked.
Thank you for your help