How to fix 'ECONNREFUSED' error in my nodejs app using docker? - mysql

Question

I am using Docker container for my node app which is a REST API Server. It use multiple backend (currently mongoDB and mysql). My mongoclient is connecting to the port defined in my docker-compose.yml but my mysql is not configuring to it, throwing ECONNREFUSED error.
Also i like to add In my localhost I have both mongodb and mysql installed on my system.
Below is the code of my Dockerfile and docker-compose.yml
FROM node:8
RUN mkdir -p /home/sharad/eapp
WORKDIR /home/sharad/eapp
COPY package.json /home/sharad/eapp/
RUN npm install
COPY . /home/sharad/eapp
EXPOSE 8016
CMD [ "npm","start" ]
version: '3.1'
services:
server:
image: sharadm20/eyantra-app
restart: always
ports:
- 8016:8016
mongo:
image: mongo
restart: always
environment:
MONGO_INITDB_ROOT_USERNAME: root
MONGO_INITDB_ROOT_PASSWORD: secret
mongo-express:
image: mongo-express
restart: always
ports:
- 8081:8081
links:
- mongo
environment:
ME_CONFIG_MONGODB_ADMINUSERNAME: root
ME_CONFIG_MONGODB_ADMINPASSWORD: secret
ME_CONFIG_MONGODB_ENABLE_ADMIN: 'true'
db:
image: mysql
command: --default-authentication-plugin=mysql_native_password
restart: always
ports:
- "3306:3306"
environment:
MYSQL_ROOT_PASSWORD: secret
adminer:
image: adminer
restart: always
ports:
- 8082:8080
And below is the error which I am encountering:
Unable to connect to the mysql database: { SequelizeConnectionRefusedError: connect ECONNREFUSED 127.0.0.1:3306 }

Answer 1

It worked by changing the Hostname in mysql config to the name similar to docker image name( in my case mysql is called db) so the hostname+port would look like db:3306.
Thanks to Marc Sances for pointing it out.