Unable to access MongoDB replicaset inside Docker Container from remote client - mongodb

Question

I have setup a mongoDB Replicaset (3-repicas) inside Docker Container. I am able to access the replicateset from host machine but unable to access the mongoDB Replicaset from a remote client.
Reference: https://www.sohamkamani.com/blog/2016/06/30/docker-mongo-replica-set/
Scripts to create mongoDB replicaset:
$ docker run -it -v <host mount path>:/data/db -p 30000:30000 --name mongo0 --net my-mongo-cluster -d mongo --replSet my-mongo-set --port 30000
$ docker run -it -v <host mount path>:/data/db -p 30001:30001 --name mongo1 --net my-mongo-cluster -d mongo --replSet my-mongo-set --port 30001
$ docker run -it -v <host mount path>:/data/db -p 30002:30002 --name mongo2 --net my-mongo-cluster -d mongo --replSet my-mongo-set --port 30002
$docker exec -it mongo1 mongo
> rs.initiate({_id: "my-mongo-set", version: 1, members: [
{ _id: 0, host : "mongo0:30000" },
{ _id: 1, host : "mongo1:30001" },
{ _id: 2, host : "mongo2:30002" }
]});
The above command was successful.
I tried accessing the mongo Replicaset from same host outside docker container:
$ mongo mongodb://<PUBLIC_IP>:30000,<PUBLIC_IP>:30001,<PUBLIC_IP>:30002/?replicaSet=my-mongo-set
my-mongo-set:PRIMARY>
even this worked:
$ mongo mongodb://localhost:30000,localhost:30001,localhost:30002/?replicaSet=my-mongo-set
my-mongo-set:PRIMARY>
my /etc/hosts file:
$ cat /etc/hosts
127.0.0.1 localhost mongo0 mongo1 mongo2
<PUBLIC_IP> <domain> mongo0 mongo1 mongo2
What is not working:
From remote client (shell and MongoDB Compass):
$ mongo mongodb://<PUBLIC_IP>:30000,<PUBLIC_IP>:30001,<PUBLIC_IP>:30002/?replicaSet=my-mongo-set
connecting to: mongodb://<PUBLIC_IP>:30000,<PUBLIC_IP>:30001,<PUBLIC_IP>:30002/?replicaSet=my-mongo-set
2020-06-02T22:56:53.776+0530 I NETWORK [js] Starting new replica set monitor for my-mongo-set/<PUBLIC_IP>:30000,<PUBLIC_IP>:30001,<PUBLIC_IP>:30002
2020-06-02T22:56:53.796+0530 I NETWORK [ReplicaSetMonitor-TaskExecutor] Successfully connected to <PUBLIC_IP>:30000 (1 connections now open to <PUBLIC_IP>:30000 with a 5 second timeout)
2020-06-02T22:56:53.796+0530 I NETWORK [js] Successfully connected to <PUBLIC_IP>:30002 (1 connections now open to <PUBLIC_IP>:30002 with a 5 second timeout)
2020-06-02T22:56:53.805+0530 I NETWORK [ReplicaSetMonitor-TaskExecutor] changing hosts to my-mongo-set/mongo0:30000,mongo1:30001,mongo2:30002 from my-mongo-set/<PUBLIC_IP>:30000,<PUBLIC_IP>:30001,<PUBLIC_IP>:30002
2020-06-02T22:56:54.315+0530 W NETWORK [js] Unable to reach primary for set my-mongo-set
2020-06-02T22:56:54.315+0530 I NETWORK [js] Cannot reach any nodes for set my-mongo-set. Please check network connectivity and the status of the set. This has happened for 1 checks in a row.
2020-06-02T22:56:54.821+0530 W NETWORK [js] Unable to reach primary for set my-mongo-set
2020-06-02T22:56:54.821+0530 I NETWORK [js] Cannot reach any nodes for set my-mongo-set. Please check network connectivity and the status of the set. This has happened for 2 checks in a row.
How to resolve this issue?

Answer 1

This is because from version 3.6 forward, mongod listens only localhost -address, until you tell it otherwise. Check here! or google "mongod bindIp".