Digital ocean mongo DB docker compose thorws "MongoServerError: Authentication failed." - node.js

Question

Wrapping up a docker tutorial. When it comes to docker containers on my laptop, it works fine no Mongo DB issue.
But ever since I put it on digital ocean(Ubuntu 20.04 LTS x64, 2GB memory, 10GB disk) the issue occured below:
MongoServerError: Authentication failed.
at Connection.onMessage (/app/node_modules/mongodb/lib/cmap/connection.js:207:30)
at MessageStream.<anonymous> (/app/node_modules/mongodb/lib/cmap/connection.js:60:60)
at MessageStream.emit (node:events:513:28)
at processIncomingData (/app/node_modules/mongodb/lib/cmap/message_stream.js:132:20)
at MessageStream._write (/app/node_modules/mongodb/lib/cmap/message_stream.js:33:9)
at writeOrBuffer (node:internal/streams/writable:392:12)
at _write (node:internal/streams/writable:333:10)
at Writable.write (node:internal/streams/writable:337:10)
at Socket.ondata (node:internal/streams/readable:766:22)
at Socket.emit (node:events:513:28) {
ok: 0,
code: 18,
codeName: 'AuthenticationFailed',
connectionGeneration: 0,
[Symbol(errorLabels)]: Set(2) { 'HandshakeError', 'ResetPool' }
codes:
package.json
"dependencies": {
"bcryptjs": "^2.4.3",
"connect-redis": "^6.1.3",
"cors": "^2.8.5",
"express": "^4.18.2",
"express-session": "^1.17.3",
"mongoose": "^6.7.2",
"redis": "^4.5.0"
},
index.js
const {
MONGO_USER,
MONGO_PASSWORD,
MONGO_IP,
MONGO_PORT,
REDIS_URL,
REDIS_PORT,
SESSION_SECRET,
} = require("./config/config");
let redisClient = redis.createClient({
legacyMode: true,
socket: {
host: REDIS_URL,
port: REDIS_PORT,
},
});
redisClient
.connect()
.then(() => console.log("redis connected"))
.catch((e) => console.error("redis error", e));
const postRouter = require("./routes/postRoutes");
const userRouter = require("./routes/userRoutes");
const app = express();
const connectWithRetry = () => {
mongoose
.connect(
`mongodb://${MONGO_USER}:${MONGO_PASSWORD}#${MONGO_IP}:${MONGO_PORT}/?authSource=admin`
)
.then(() => console.log("successfully connected to DB"))
.catch((e) => {
console.error(e);
setTimeout(connectWithRetry, 5000);
});
};
connectWithRetry();
app.enable("trust proxy");
app.use(cors({}));
...
docker-compose.yml
version: "3"
services:
nginx:
image: nginx:stable-alpine
ports:
- "3000:80"
volumes:
- ./nginx/default.conf:/etc/nginx/conf.d/default.conf:ro
depends_on:
- node-app
node-app:
build: .
environment:
- PORT=3000
depends_on:
- mongo
mongo:
image: mongo
environment:
- MONGO_INITDB_ROOT_USERNAME=snap
- MONGO_INITDB_ROOT_PASSWORD=mypassword
volumes:
- mongo-db:/data/db
redis:
image: redis
volumes:
mongo-db:
docker-compose.prod.yml
version: "3"
services:
nginx:
ports:
- "80:80"
node-app:
build:
context: .
args:
NODE_ENV: production
environment:
- NODE_ENV=production
- MONGO_USER=${MONGO_USER}
- MONGO_PASSWORD=${MONGO_PASSWORD}
- SESSION_SECRET=${SESSION_SECRET}
command: node index.js
mongo:
environment:
- MONGO_INITDB_ROOT_USERNAME=${MONGO_INITDB_ROOT_USERNAME}
- MONGO_INITDB_ROOT_PASSWORD=${MONGO_INITDB_ROOT_PASSWORD}
The environment variables stored in .env file which located in the root directory of Ubuntu droplet. I tried hard coding the mongo uri instead of using environment variables but got the same result so pretty sure it may not be a cause.
Here's a log of db users below:
use admin
switched to db admin
admin> db.system.users.find()
[
{
_id: 'admin.snap',
userId: new UUID("4e79e245-894e-4d9a-9d76-802c970d9129"),
user: 'snap',
db: 'admin',
...
},
roles: [ { role: 'root', db: 'admin' } ]
},
{
_id: 'admin.admin',
userId: new UUID("0a8a471e-0e70-4e1c-b9ed-d99ede9ad0bd"),
user: 'admin',
db: 'admin',
...
},
roles: [ { role: 'root', db: 'admin' } ]
},
{
_id: 'test.snap',
userId: new UUID("4282b24f-9b15-4956-865f-ef9b206a499d"),
user: 'snap',
db: 'test',
...
roles: [ { role: 'readWrite', db: 'test' } ]
}
]
Thanks for your help.