Mongodb Replica Set with docker

Recently, I came across a problem with mongodb replica set where I was not able to connect to replicaSet using the replicaSet url. Probably many of you have already overcome this problem. But for some reason, I could not find a solution that exactly worked for me. In the process, I managed to find a solution that worked for me. Documenting here if it helps anyone else. I was using docker to setup the cluster. The steps to setup a mongodb replicaSet are quite straight forward

1. Setup 3 mongo servers. (primary, secondary and the arbiter). In this docker setup, 3 containers are running an instance of mongo server each.

version: "3.8"

services:
  mongo-1-2:
    container_name: "mongo-1-2"
    image: mongo:5.0
    ports:
      - "27022:27022"
    command: mongod --replSet rs1 --port 27022 --bind_ip_all
    restart: always
    networks:
      - mongors-network

  mongo-1-3:
    container_name: "mongo-1-3"
    image: mongo:5.0
    ports:
      - "27023:27023"
    command: mongod --replSet rs1 --port 27023 --bind_ip_all
    restart: always
    networks:
      - mongors-network

  mongo-1-1:
    container_name: "mongo-1-1"
    image: mongo:5.0
    ports:
      - "27021:27021"
    command: mongod --replSet rs1 --port 27021 --bind_ip_all
    links:
      - mongo-1-2:mongo-1-2
      - mongo-1-3:mongo-1-3
    restart: always
    networks:
      - mongors-network

  mongo-rs1-setup:
    container_name: "mongo-rs1-setup"
    image: mongo:5.0
    depends_on:
      - "mongo-1-1"
      - "mongo-1-2"
      - "mongo-1-3"
    links:
      - mongo-1-1:mongo-1-1
      - mongo-1-2:mongo-1-2
      - mongo-1-3:mongo-1-3
    volumes:
      - ./scripts:/scripts
    environment:
      - MONGO1=mongo-1-1
      - MONGO2=mongo-1-2
      - MONGO3=mongo-1-3
      - RS=rs1
    entrypoint: ["/scripts/cluster-setup.sh"]

networks:
  mongors-network:
    driver: bridge

2. Run rs.initiate with your replicaset config. I am running that through a bash script here. This script runs inside docker on the same mongo servers container network

#!/bin/bash 

mongodb1=host.docker.internal
mongodb2=host.docker.internal
mongodb3=host.docker.internal

port1=27021
port2=27022
port3=27023

echo ${mongodb1}:${port1}
echo ${mongodb2}:${port2}
echo ${mongodb3}:${port3}

port=${PORT:-27017}

echo "Waiting for startup.."
until mongosh --host…