I am currently trying to connect my Node container to my Mongo container using an M1 chip. Many have said that you can't run Mongo 4.9+ on an M1 Mac as there is no support for AVR. I can't say why but on my M1 mongo runs just fine. I can connect to the container via Mongo Compass using mongo://mongo:27017. Additionally if I run my Node app outside of docker I can connect to the Mongo container just fine using the same connection string. But for some reason I cannot connect the containerized node app to the containerized Mongo service.
Dockerfile
FROM node:12
# Create app directory
WORKDIR /usr/src/app
# Copy dependencies
COPY package*.json ./
# Install dependencies
RUN npm install
RUN npm ci --only=production
# Bundle app source
COPY . .
EXPOSE 3000
CMD [ "node", "server.js" ]
docker-compose.yml
version: "2"
services:
web:
build: .
ports:
- "3000:3000"
depends_on:
- mongo
mongo:
image: mongo
ports:
- "27017:27017"
Connection Method
/* Mongoose Connection */
const mongoose = require('mongoose')
mongoose.Promise = global.Promise
mongoose.connect(
'mongodb://mongo:27017',
{ useNewUrlParser: true }
)
mongoose.connection.on('error', console.error.bind(console, 'MongoDB connection
Error:'))
mongoose.set('debug', true)
module.exports = mongoose.connection
server.js
require('dotenv').config();
const express = require('express')
const app = express()
const bodyParser = require('body-parser')
const expressValidator = require('express-validator')
var cookieParser = require('cookie-parser');
const jwt = require('jsonwebtoken');
app.use(cookieParser()); // Add this after you initialize express.
// db
require('./data/reddit-db')
// set db
const exphbs = require('express-handlebars')
// body parser
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: false }))
app.use(expressValidator())
app.engine('handlebars', exphbs({ defaultLayout: 'main' }))
app.set('view engine', 'handlebars')
var checkAuth = (req, res, next) => {
console.log("Checking authentication");
if (typeof req.cookies.nToken === "undefined" || req.cookies.nToken === null) {
req.user = null;
} else {
var token = req.cookies.nToken;
var decodedToken = jwt.decode(token, { complete: true }) || {};
req.user = decodedToken.payload;
}
next();
};
app.use(checkAuth);
// routes
require('./controllers/posts.js')(app)
require('./controllers/comments.js')(app)
require('./controllers/auth.js')(app)
require('./controllers/replies.js')(app)
// Start Server
app.listen(3000, () => {
console.log('Reddit Search listening on port localhost:3000!');
});
module.exports = app
Error
redditjspart2-web-1 | Reddit Search listening on port localhost:3000!
redditjspart2-web-1 | MongoDB connection Error: { MongoNetworkError: failed to connect to server [127.0.0.1:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]
redditjspart2-web-1 | at Pool.<anonymous> (/usr/src/app/node_modules/mongoose/node_modules/mongodb/lib/core/topologies/server.js:438:11)
redditjspart2-web-1 | at Pool.emit (events.js:198:13)
redditjspart2-web-1 | at createConnection (/usr/src/app/node_modules/mongoose/node_modules/mongodb/lib/core/connection/pool.js:561:14)
redditjspart2-web-1 | at connect (/usr/src/app/node_modules/mongoose/node_modules/mongodb/lib/core/connection/pool.js:994:11)
redditjspart2-web-1 | at makeConnection (/usr/src/app/node_modules/mongoose/node_modules/mongodb/lib/core/connection/connect.js:31:7)
redditjspart2-web-1 | at callback (/usr/src/app/node_modules/mongoose/node_modules/mongodb/lib/core/connection/connect.js:264:5)
redditjspart2-web-1 | at Socket.err (/usr/src/app/node_modules/mongoose/node_modules/mongodb/lib/core/connection/connect.js:294:7)
redditjspart2-web-1 | at Object.onceWrapper (events.js:286:20)
redditjspart2-web-1 | at Socket.emit (events.js:198:13)
redditjspart2-web-1 | at emitErrorNT (internal/streams/destroy.js:91:8)
redditjspart2-web-1 | at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
redditjspart2-web-1 | at process._tickCallback (internal/process/next_tick.js:63:19)
redditjspart2-web-1 | name: 'MongoNetworkError',
redditjspart2-web-1 | [Symbol(mongoErrorContextSymbol)]: {} }
What I Have Tried:
- Running the same repo on an intel mac (works flawlessly)
- Changing the connection string IP (mongo, localhost, 127.0.0.1)
- Using a docker network with the bridge driver and using the assigned ip in the connection string
- pinging mongo from inside Node container (this works and all packets are received)
The error says that it's trying to connect to 127.0.0.1:27017 which means it is properly resolving the hostname and mapping it to my localhost. So the Node container is definitely able to find it. This also makes sense because I can still ping the Mongo container from the Node container as I mentioned earlier. Looks like Mongo is just refusing to connect for some reason.
I am really struggling to figure out why this would be the case. The link to my repo is public and you can find it on github here: https://github.com/lukeaparker/reddit.jspart2
Thanks so so much!!
failed to connect to server [127.0.0.1:27017]Somehow your node container tries to connect to itself (127.0.0.1), this is not the right IP of your mongodb container. The name resolution seems not to work. "mongo" should resolve to something else than the subnet 127.0.0.0/8 – Sinkage