Node can't connect to Redis via Docker Compose - node.js

Question

I'm running a React app on Node and Redis via docker compose:
version: "3"
services:
webapp:
build: ./
ports:
- "127.0.0.1:3000:9090"
depends_on:
- redis
command:
npm run start
nginx:
build: ./nginx
ports:
- "80:80"
environment:
- NGINX_HOST=127.0.0.1
- NGINX_PORT=80
command:
service nginx start
redis:
image: redis
ports:
- "6379:6379"
volumes:
- ./data:/data
Docker file:
FROM node:alpine
WORKDIR /usr/src/app
COPY package.json ./
RUN npm install
COPY . .
EXPOSE 9090
RUN npm run build_prod
Server.js:
const redisClient = RedisClient.createClient(6379,'redis');
I get a Redis connection refused error when I run docker-compose up --build:
redis_1 | 1:M 15 Nov 13:55:19.865 * Ready to accept connections
webapp_1 |
webapp_1 | > web.globalmap.fatmap.com#0.0.1 start /usr/src/app
webapp_1 | > node ./build/server.js
webapp_1 |
webapp_1 | events.js:193
webapp_1 | throw er; // Unhandled 'error' event
webapp_1 | ^
webapp_1 |
webapp_1 | Error: Redis connection to 127.0.0.1:6379 failed - connect ECONNREFUSED 127.0.0.1:6379
webapp_1 | at Object._errnoException (util.js:1031:13)
webapp_1 | at _exceptionWithHostPort (util.js:1052:20)
webapp_1 | at TCPConnectWrap.afterConnect [as oncomplete]
I would like to know how to get docker to link both containers correctly.

Answer 1

Looks like redis does not resolve to the correct IP address.
Try a redis URI when creating the client.
// [redis:]//[[user][:password#]][host][:port][/db-number][?db=db-number[&password=bar[&option=value]]]
const redisClient = RedisClient.createClient('redis://redis:6379');
Provide the username, password, and db number if appropriate.

Answer 2

This solved my issue with node not being able to connect to redis using docker-compose.yml
const redis_client = redis.createClient({host: 'redis'});
then inside of my docker-compose.yml file i have the following
version: '3'
services:
redis:
image: redis
socket:
container_name: socket
build:
context: .
dockerfile: Dockerfile
depends_on:
- redis
links:
- redis
source: https://github.com/docker-library/redis/issues/45

Answer 3

I haven't found any issues using process.env. to access the environment variable of docker.
I have declared the variable in the docker-compose.yml file.
version: '3.7'
services:
api:
build: .
container_name: api-framework
depends_on:
- redis
ports:
- 8080:6002
networks:
- fronted
- backend
environment:
redis_server_addr: redis
redis:
container_name: my-redis
image: "redis:5"
ports:
- 6379
networks:
- backend
Then, the configuration file has the following line.
redis_host: process.env.redis_server_addr
It works for me.