I am using node lambda which is a api server that accepts request from API gateway. The lambda connects to mongo db atlas to pull data from the db and then returns it in the response. For the most part it works fine with no issues but randomly it runs into mongo atlas connection errors:
{
"errorType": "Runtime.UnhandledPromiseRejection",
"errorMessage": "MongooseServerSelectionError: Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/",
"reason": {
"errorType": "MongooseServerSelectionError",
"errorMessage": "Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/",
"message": "Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/",
"reason": {
"type": "ReplicaSetNoPrimary",
"setName": null,
"maxSetVersion": null,
"maxElectionId": null,
"servers": {},
"stale": false,
"compatible": true,
"compatibilityError": null,
"logicalSessionTimeoutMinutes": null,
"heartbeatFrequencyMS": 10000,
"localThresholdMS": 15,
"commonWireVersion": null
},
"stack": [
"MongooseServerSelectionError: Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/",
" at NativeConnection.Connection.openUri (/var/task/node_modules/mongoose/lib/connection.js:846:32)",
" at /var/task/node_modules/mongoose/lib/index.js:351:10",
" at /var/task/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:5",
" at new Promise (<anonymous>)",
" at promiseOrCallback (/var/task/node_modules/mongoose/lib/helpers/promiseOrCallback.js:30:10)",
" at Mongoose._promiseOrCallback (/var/task/node_modules/mongoose/lib/index.js:1149:10)",
" at Mongoose.connect (/var/task/node_modules/mongoose/lib/index.js:350:20)",
" at Object.<anonymous> (/var/task/build/app.js:172:40)",
" at Module._compile (internal/modules/cjs/loader.js:999:30)",
" at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)",
" at Module.load (internal/modules/cjs/loader.js:863:32)",
" at Function.Module._load (internal/modules/cjs/loader.js:708:14)",
" at Module.require (internal/modules/cjs/loader.js:887:19)",
" at require (internal/modules/cjs/helpers.js:74:18)",
" at _tryRequire (/var/runtime/UserFunction.js:75:12)",
" at _loadUserApp (/var/runtime/UserFunction.js:95:12)"
]
},
"promise": {},
"stack": [
"Runtime.UnhandledPromiseRejection: MongooseServerSelectionError: Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you're trying to access the database from an IP that isn't whitelisted. Make sure your current IP address is on your Atlas cluster's IP whitelist: https://docs.atlas.mongodb.com/security-whitelist/",
" at process.<anonymous> (/var/runtime/index.js:35:15)",
" at process.emit (events.js:314:20)",
" at process.EventEmitter.emit (domain.js:483:12)",
" at processPromiseRejections (internal/process/promises.js:209:33)",
" at processTicksAndRejections (internal/process/task_queues.js:98:32)"
]
}
My mongo DB atlas instance allows ip addresses from everywhere: 0.0.0.0.
This is how I am making my mongo connection:
import express from "express";
import serverless from "serverless-http";
import mongoose, { Error } from "mongoose";
import { APIGatewayProxyHandler } from 'aws-lambda';
import { AppSettings } from "./constants/constants";
class App {
public app: express.Application;
public mongoUrl: string = AppSettings.MONGODBURL;
constructor() {
this.setupDBConn();
}
async setupDBConn() {
this.app = express();
}
private async mongoSetup() {
await mongoClient;
console.log('MONGO connection successfully made...');
}
}
const mongoClient = mongoose.connect(AppSettings.MONGODBURL, { useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex: true, useFindAndModify: false });
export const handler: APIGatewayProxyHandler = serverless(new App().app);
I am also using mongoose version 5.12.8
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