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I followed the instructions but I always get the result like this. Please help me fix this.

docker-compose up

Creating network "devcontainers-mongodb-replica-set-with-docker_netApplication" with the default driver
Creating mongo1 ... done
Creating mongo3 ... done
Creating mongo2 ... done
Creating mongo-setup ... done
Attaching to mongo1, mongo3, mongo2, mongo-setup
mongo-setup | ********************************************** mongo1
mongo-setup | Waiting for startup..
mongo3 exited with code 1
mongo2 exited with code 1
mongo1 exited with code 1
mongo2 exited with code 1
mongo1 exited with code 1
mongo3 exited with code 1
mongo2 exited with code 1
mongo-setup | done
mongo-setup | SETUP.sh time now: 15:31:39
mongo-setup | MongoDB shell version v4.2.15
mongo-setup | connecting to: mongodb://mongo1:30001/?compressors=disabled&gssapiServiceName=mongodb
mongo-setup | 2021-08-02T15:31:40.675+0000 E QUERY [js] Error: couldn't connect to server mongo1:30001, connection attempt failed: SocketException: Error connecting to mongo1:30001 (172.18.0.2:30001) :: caused by :: Connection refused :
mongo-setup | connect@src/mongo/shell/mongo.js:353:17
mongo-setup | @(connect):2:6
mongo-setup | 2021-08-02T15:31:40.677+0000 F - [main] exception: connect failed
mongo-setup | 2021-08-02T15:31:40.677+0000 E - [main] exiting with code 1
mongo1 exited with code 1
mongo3 exited with code 1
mongo2 exited with code 1

Hi,

I have deployed successfully the 3 nodes,

[root@localhost devcontainers-mongodb-replica-set-with-docker]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                    PORTS                      NAMES
65282c4114d5        mongo:4.2           "docker-entrypoint.s…"   About an hour ago   Up 15 minutes             0.0.0.0:30002->27017/tcp   mongo2
f245429d27dc        mongo:4.2           "docker-entrypoint.s…"   About an hour ago   Up 12 minutes             0.0.0.0:30003->27017/tcp   mongo3
97f391716591        mongo:4.2           "docker-entrypoint.s…"   About an hour ago   Up 12 minutes (healthy)   0.0.0.0:30001->27017/tcp   mongo1

However, if you try to connect using the replicaSet name you cant connect.

This works:
mongo mongodb://pruebauser:prueba123@localhost:30001,localhost:30002,localhost:30003/prueba

And this doesnt work (you specify the replicaSet on connection ?replicaSet=rs0):

[root@localhost devcontainers-mongodb-replica-set-with-docker]# mongo mongodb://pruebauser:prueba123@localhost:30001,localhost:30002,localhost:30003/prueba?replicaSet=rs0
MongoDB shell version v4.2.0
connecting to: mongodb://localhost:30001,localhost:30002,localhost:30003/prueba?compressors=disabled&gssapiServiceName=mongodb&replicaSet=rs0

{"t":{"$date":"2021-03-18T10:18:11.751Z"},"s":"I",  "c":"NETWORK",  "id":4333208, "ctx":"ReplicaSetMonitor-TaskExecutor","msg":"RSM host selection timeout","attr":{"replicaSet":"rs0","error":"FailedToSatisfyReadPreference: Could not find host matching read preference { mode: \"nearest\" } for set rs0"}}
Error: connect failed to replica set rs0/localhost:30001,localhost:30002,localhost:30003 :
connect@src/mongo/shell/mongo.js:374:17
@(connect):2:6
exception: connect failed
exiting with code 1

The env file is the next below:

[root@localhost devcontainers-mongodb-replica-set-with-docker]# cat .env
# MongoDB
MONGO_URL=mongodb://mongodb:27017
MONGO_INITDB_ROOT_USERNAME=admin
MONGO_INITDB_ROOT_PASSWORD=admin123
MONGO_INITDB_DATABASE=prueba
MONGO_INITDB_USERNAME=pruebauser
MONGO_INITDB_PASSWORD=prueba123
MONGO_REPLICA_SET_NAME=rs0