ReplicaSetNoPrimary MongooseServerSelectionError when connecting from inside a Docker container

[ghettosamson]

Environment: MacOS
Issue:
I have a NodeJS application that I want to run inside a Docker container to connect to the replica set using mongoose 5.10.6. I start my replica set with run-rs --dbpath ./data --keep. When I run my application outside of a Docker container node server I connect successfully {"message":"Mongoose successfully connected to mongodb://localhost:27017,localhost:27018,localhost:27019/my-app-dev?replicaSet=rs","level":"info","service”:"my-ap" However, when I run the application inside of a Docker container, I get the following error

info: Mongoose disconnected from mongodb://host.docker.internal:27017,host.docker.internal:27018,host.docker.internal:27019/my-app-dev?replicaSet=rs {"service":"my-app"}
error: Error connecting to the database connect ECONNREFUSED 127.0.0.1:27017 {"service":"my-app","reason":{"type":"ReplicaSetNoPrimary","setName":"rs","maxSetVersion":1,"maxElectionId":"7fffffff0000000000000079","servers":{},"stale":false,"compatible":true,"compatibilityError":null,"logicalSessionTimeoutMinutes":null,"heartbeatFrequencyMS":10000,"localThresholdMS":15,"commonWireVersion":7},"stack":"MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017\n    at NativeConnection.Connection.openUri (/src/node_modules/mongoose/lib/connection.js:800:32)\n    at /src/node_modules/mongoose/lib/index.js:341:10\n    at /src/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:5\n    at new Promise (<anonymous>)\n    at promiseOrCallback (/src/node_modules/mongoose/lib/helpers/promiseOrCallback.js:30:10)\n    at Mongoose.connect (/src/node_modules/mongoose/lib/index.js:340:10)\n    at Object.<anonymous> (/src/index.js:46:21)\n    at Module._compile (internal/modules/cjs/loader.js:1138:30)\n    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)\n    at Module.load (internal/modules/cjs/loader.js:986:32)\n    at Function.Module._load (internal/modules/cjs/loader.js:879:14)\n    at Module.require (internal/modules/cjs/loader.js:1026:19)\n    at require (internal/modules/cjs/helpers.js:72:18)\n    at Object.<anonymous> (/src/server.js:3:13)\n    at Module._compile (internal/modules/cjs/loader.js:1138:30)\n    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1158:10)"}

Here is my Dockerfile

FROM node:12-alpine

LABEL maintainer="***" version="0.0.1"

WORKDIR /src

# Alpine image does not come with bash
RUN apk add --no-cache bash

COPY package.json /src/
RUN npm install
COPY . /src

EXPOSE 3000

CMD [ "npm", "start"]

[mexin]

I think your problem is because you are only opening port 3000, can you try changing EXPOSE 3000 to EXPOSE 3000 27017 27018 27019 see if that does the trick.

[ghettosamson]

I updated the run command to bind ports 27017, 27018, 27019 and also the EXPOSE directive in the Dockerfile but I still get the connection refused.

[mexin]

I got mine running, try the following when you run the container:
docker run -ti -p 27017-27019:27017-27019 --network="host" --name mongo-runrs YOURIMAGEID
If you don't define --network="host" then you won't be able to connect to the container using localhost.

Hope this helps.

[ghettosamson]

I still get the same error. Note that when we use "host" network mode the published ports are discarded.

docker run -it -p 27017-27019 --network="host" --name my-api --env-file RS.env my-api
WARNING: Published ports are discarded when using host network mode

> [email protected] start /src
> node --inspect server

Debugger listening on ws://127.0.0.1:9229/fe5f0b84-faa4-40eb-bb0f-037ccb27f3fd
For help, see: https://nodejs.org/en/docs/inspector
debug: Mongoose connecting to mongodb://localhost:27017,localhost:27018,localhost:27019/my-db?replicaSet=rs with options  {"useCreateIndex":true,"useNewUrlParser":true,"useUnifiedTopology":true,"useFindAndModify":false,"timestamp":"2020-10-27T12:06:34.295Z"}
info: Request logging set to: false {"timestamp":"2020-10-27T12:06:34.414Z"}
info: MY API Express app starting on port 3000 with log level silly {"timestamp":"2020-10-27T12:06:34.415Z"}
error: UnhandledRejection Error: connect ECONNREFUSED 127.0.0.1:27017 {"timestamp":"2020-10-27T12:07:04.311Z"}
error: connect ECONNREFUSED 127.0.0.1:27017 {"reason":{"type":"ReplicaSetNoPrimary","setName":"rs","maxSetVersion":1,"maxElectionId":"7fffffff00000000000000a5","servers":{},"stale":false,"compatible":true,"compatibilityError":null,"logicalSessionTimeoutMinutes":null,"heartbeatFrequencyMS":10000,"localThresholdMS":15,"commonWireVersion":7}}

[anasanzari]

I'm facing the same issue, where client is disconnected arbitrarily saying MongooseServerSelectionError: connection timeout.