Failed to connect to mongodb

[milkcoke]

mongoose.connect(
  'mongodb://max:secret@goals-mongodb:27017/course-goals?authSource=admin',
)

Already set mongodb -e

FAILED TO CONNECT TO MONGODB
2023-04-25T22:59:36.462919176Z MongoError: Authentication failed.
2023-04-25T22:59:36.462946325Z at MessageStream.messageHandler (/app/node_modules/mongodb/lib/cmap/connection.js:299:20)
2023-04-25T22:59:36.462950245Z at MessageStream.emit (node:events:511:28)
2023-04-25T22:59:36.462952535Z at processIncomingData (/app/node_modules/mongodb/lib/cmap/message_stream.js:144:12)
2023-04-25T22:59:36.462954835Z at MessageStream._write (/app/node_modules/mongodb/lib/cmap/message_stream.js:42:5)
2023-04-25T22:59:36.462957235Z at writeOrBuffer (node:internal/streams/writable:399:12)
2023-04-25T22:59:36.462959355Z at _write (node:internal/streams/writable:340:10)
2023-04-25T22:59:36.462961415Z at Writable.write (node:internal/streams/writable:344:10)
2023-04-25T22:59:36.462963505Z at Socket.ondata (node:internal/streams/readable:774:22)
2023-04-25T22:59:36.462965535Z at Socket.emit (node:events:511:28)
2023-04-25T22:59:36.462967545Z at addChunk (node:internal/streams/readable:332:12)
2023-04-25T22:59:36.462969555Z at readableAddChunk (node:internal/streams/readable:305:9)
2023-04-25T22:59:36.462971595Z at Readable.push (node:internal/streams/readable:242:10)
2023-04-25T22:59:36.462978035Z at TCP.onStreamRead (node:internal/stream_base_commons:190:23) {
2023-04-25T22:59:36.462980295Z ok: 0,
2023-04-25T22:59:36.462982335Z code: 18,
2023-04-25T22:59:36.462984375Z codeName: 'AuthenticationFailed'
2023-04-25T22:59:36.462986405Z }

[milkcoke]

Default docker volume directory path is /var/lib/docker.

[milkcoke]

Default bridge network

# run docker container with `default bridge network`
$ docker run -it --name goals-mongodb --rm -v mongo-data:/data/db mongodb

$  docker container ls
CONTAINER ID   IMAGE          COMMAND                  CREATED          STATUS          PORTS       NAMES
969e474a667e   e09d4dc87e74   "docker-entrypoint.s…"   11 minutes ago   Up 11 minutes   27017/tcp   goals-mongodb

I tried to nodejs backend application using container name

(async ()=>{
  try {
    await mongoose.connect(
        'mongodb://max:secret@goals-mongodb:27017/course-goals?authSource=admin',
        {
          useNewUrlParser: true,
          useUnifiedTopology: true,
        },
    );

    console.log('Success to connect mongoDB')
  } catch (e) {
// error occurs: ENOTFOUND `goals-mongodb`
    console.error(e)
  }
})()

Why do error occur?

Differences between user-defined bridges and the default bridge
User-defined bridges provide automatic DNS resolution between containers.
Containers on the default bridge network can only access each other by IP addresses, unless you use the --link option, which is considered legacy. On a user-defined bridge network, containers can resolve each other by name or alias. - Docker docs

How to resolve this?

Use user-defined bridges which provides automatic DNS resolution between containers.

mongodb container

$ docker run -it --name goals-mongodb --rm -v mongo-data:/data/db \
# user defined network
--network goals-network mongodb

nodejs container

$ docker run -it --name goals-backend-node --rm -v node_moduels \
--network goals-network nodejs-app

Success to connect each other.

$ docker container inspect goals-mongodb

mongodb inspect network

    "Networks" : {
      "goals-network" : {
        "IPAMConfig" : null,
        "Links" : null,
        "Aliases" : [ "4f33e3879e54" ],
        "NetworkID" : "30986f5672a94f72f02e7088996e0c3004233173ef6b0614865287a50a9c35e6",
        "EndpointID" : "376017da69d5ef9750a9f532b5dfe70a729bdfe2b3aa41e0736794a433816ab6",
        "Gateway" : "172.19.0.1",
        "IPAddress" : "172.19.0.2",
        "IPPrefixLen" : 16,
        "IPv6Gateway" : "",
        "GlobalIPv6Address" : "",
        "GlobalIPv6PrefixLen" : 0,
        "MacAddress" : "02:42:ac:13:00:02",
        "DriverOpts" : null
      }

nodejs inspect network

$ docker container inspect goals-backend-node

   "Networks" : {
      "goals-network" : {
        "IPAMConfig" : null,
        "Links" : null,
        "Aliases" : [ "beec4b155658" ],
        "NetworkID" : "30986f5672a94f72f02e7088996e0c3004233173ef6b0614865287a50a9c35e6",
        "EndpointID" : "d0f7721f44f3ca710a3bb8a4379e3bec34632de31aa0bbe965db4236cdd97a97",
        "Gateway" : "172.19.0.1",
        "IPAddress" : "172.19.0.3",
        "IPPrefixLen" : 16,
        "IPv6Gateway" : "",
        "GlobalIPv6Address" : "",
        "GlobalIPv6PrefixLen" : 0,
        "MacAddress" : "02:42:ac:13:00:03",
        "DriverOpts" : null
      }