Can not access replicaset mongodb(docker) from host - node.js

Question

I have my nodejs code running on my host machine(MACOS) and which is trying to connect to the mongodb replicaset which is running in the docker.
version: "3"
services:
redis_master:
image: redis:2.8
volumes:
- "/Users/hiteshbaldaniya/docker-redis/master:/data/"
ports:
- "6379:6379"
networks:
- database
mongodb_primary:
build:
context: ./
dockerfile: DockerfileDB
command: mongod --replSet "hdbrs" --dbpath "/data/27017/" --port 27017
ports:
- "27017:27017"
volumes:
- "/Users/hiteshbaldaniya/docker-mongodb/:/data/"
networks:
- database
mongodb_secondary1:
build:
context: ./
dockerfile: DockerfileDB
command: mongod --replSet "hdbrs" --dbpath "/data/27018/" --port 27018
ports:
- "27018:27018"
volumes:
- "/Users/hiteshbaldaniya/docker-mongodb/:/data/"
networks:
- database
mongodb_secondary2:
build:
context: ./
dockerfile: DockerfileDB
command: mongod --replSet "hdbrs" --dbpath "/data/27019/" --port 27019
ports:
- "27019:27019"
volumes:
- "/Users/hiteshbaldaniya/docker-mongodb/:/data/"
networks:
- database
hdb_nginx:
build:
context: ./nginx/
dockerfile: DockerfileNginx.dev
ports:
- "8081:80"
volumes:
- "/Users/hiteshbaldaniya/logs/docker-nginx/:/var/log/nginx/"
networks:
- backend
networks:
backend:
driver: bridge
database:
driver: bridge
All 3 ports are open on my host machine and I tried using telnet and I am able to connect to all the ports as well.
My nodejs application using mongodb-node-driver and using following configuration.
module.exports = {
servers: [{
host: 'localhost',
port: 27017,
},
{
host: 'localhost',
port: 27018,
},
{
host: 'localhost',
port: 27019,
},
],
database: 'mydatabase',
options: {
"raw": false,
"poolSize": 5,
"readPreference": "primaryPreferred",
"w": 1,
"wtimeout": 12000,
"replicaSet": "hdbrs"
}
};
While connecting to mongodb my application throws following error can someone help me over here?
{ MongoNetworkError: failed to connect to server [mongodb_primary:27017] on first connect [MongoNetworkError: getaddrinfo ENOTFOUND mongodb_primary mongodb_primary:27017]
at Pool.<anonymous> (/Users/hiteshbaldaniya/Applications/contentstack-migration/node_modules/mongodb-core/lib/topologies/server.js:505:11)
at Pool.emit (events.js:198:13)
at Connection.<anonymous> (/Users/hiteshbaldaniya/Applications/contentstack-migration/node_modules/mongodb-core/lib/connection/pool.js:329:12)
at Object.onceWrapper (events.js:286:20)
at Connection.emit (events.js:198:13)
at Socket.<anonymous> (/Users/hiteshbaldaniya/Applications/contentstack-migration/node_modules/mongodb-core/lib/connection/connection.js:245:50)
at Object.onceWrapper (events.js:286:20)
at Socket.emit (events.js:198:13)
at emitErrorNT (internal/streams/destroy.js:91:8)
at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
name: 'MongoNetworkError',
message:
'failed to connect to server [mongodb_primary:27017] on first connect [MongoNetworkError: getaddrinfo ENOTFOUND mongodb_primary mongodb_primary:27017]' }
thanks,

Answer 1

I was able to figure out solution. By adding the host entries in my /etc/hosts file.
127.0.0.1 mongodb_primary
127.0.0.1 mongodb_secondary1
127.0.0.1 mongodb_secondary2
I am still not sure what is wrong with localhost while connecting to mongodb running inside docker from host machine, I would still need to understand the behaviour of this.
Just for the node I have also tried adding the --bind_ip_all in command line during command for mongodb run.
Do let me know if someone know it. thanks