Inconsistent MongoDB Connection Behavior with Docker Compose Configuration about charts HOT 2 CLOSED

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I found a solution to my problem. Here are the details:

Environment variables in the .env file:

# MONGO
MONGO_HOST=127.0.0.1
MONGO_PORT=3001
MONGO_DB_NAME=MyApp
MONGO_USER=admin
MONGO_PASSWORD=password
MONGO_SECONDARY_KEY=X5ZxqCt4cQrQ3Zfr2zRBFk8R0eakYBaH

# MONGO EXPRESS
MONGO_EXPRESS_PORT=8080
MONGO_EXPRESS_AUTH_USERNAME=admin
MONGO_EXPRESS_AUTH_PASSWORD=password

Here's a sample of the Node.js connection code where I've added &directConnection=true to the mongodb url that fix the problem.

import mongoose from "mongoose"
import dotenv from "dotenv"

dotenv.config()

export const db_connect = async () => {
  console.log("Connecting to MongoDB...")

  const db = await mongoose.connect(
    `mongodb://${process.env.MONGO_USER}:${process.env.MONGO_PASSWORD}@${process.env.MONGO_HOST}:${process.env.MONGO_PORT}/${process.env.MONGO_DB_NAME}?authSource=admin&directConnection=true`
  )

  console.log("Connected to MongoDB")
}

db_connect()

Here's the complete Docker Compose file:

version: "3.9"

services:
  mongodb:
    image: bitnami/mongodb:latest
    ports:
      - "${MONGO_PORT}:${MONGO_PORT}"
    environment:
      MONGODB_ADVERTISED_HOSTNAME: ${MONGO_HOST}
      MONGODB_ADVERTISED_PORT_NUMBER: ${MONGO_PORT}
      MONGODB_PORT_NUMBER: ${MONGO_PORT}
      MONGODB_ROOT_USER: ${MONGO_USER}
      MONGODB_ROOT_PASSWORD: ${MONGO_PASSWORD}
      MONGODB_REPLICA_SET_MODE: primary
      MONGODB_REPLICA_SET_KEY: ${MONGO_SECONDARY_KEY}
    volumes:
      - ./database:/bitnami/mongodb

  mongo-express:
    image: mongo-express:latest
    ports:
      - "8081:8081"
    environment:
      ME_CONFIG_MONGODB_URL: mongodb://${MONGO_USER}:${MONGO_PASSWORD}@mongodb:${MONGO_PORT}
      ME_CONFIG_BASICAUTH_USERNAME: ${MONGO_EXPRESS_AUTH_USERNAME}
      ME_CONFIG_BASICAUTH_PASSWORD: ${MONGO_EXPRESS_AUTH_PASSWORD}
    depends_on:
      - mongodb
    restart: unless-stopped

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