Redis docker-compose with Nodejs - connect ENOENT - node.js

Question

I am trying to containerize my whole developer workflow using docker-compose. Problem I am facing is with redis contianer. My worker container is unable to connect to redis. I trie different solution from stackoverflow like:
Setting up node with redis using docker-compose
Access redis locally on docker - docker compose
nodejs, redis, npm and docker-compose setup
Docker-compose , anyway to specify a redis.conf file?
How to connect to a Redis container using Docker Compose?
And many others also from github, tried different examples but no luck.
Here is my docker-compose file:
version: "3.6"
services:
redis_db:
# image: bitnami/redis:latest # tried different image also
image: redis
container_name: rme_redis
network_mode: host # tried networks also
# command: ['redis-server', '/redis.conf']
# volumes:
# - ./docker/redis.conf:/redis.conf
# hostname: redis_db
# networks:
# - rme
# environment:
# - ALLOW_EMPTY_PASSWORD=yes
# - REDIS_PASSWORD="redis"
ports:
- 6379:6379
# networks:
# node_net:
# ipv4_address: 172.28.1.4
worker:
build: worker
image: worker
container_name: rme_worker
command: node worker.js
# networks:
# - rme
# network_mode: host
environment:
- REDIS_URL="redis://redis_db:6379" # localhost when netowk_mode is host
volumes:
- ./worker:/app
# links:
# - redis_db
depends_on:
- redis_db
Error I am getting is:
Error: Redis connection to "redis://redis_db:6379" failed - connect ENOENT "redis://redis_db:6379"
at PipeConnectWrap.afterConnect [as oncomplete] (net.js:1141:16) {
errno: -2,
code: 'ENOENT',
syscall: 'connect',
address: '"redis://redis_db:6379"'
}
Operating system: macOS
Docker: Docker Desktop
Edit: Found a solution using host and port in js code
const redisClient = redis.createClient({
host: process.env.REDIS_HOST,
port: parseInt(process.env.REDIS_PORT)
})
# docker-compose.yml
version: "3.6"
services:
redis_db:
image: redis
# only needed to directly access Redis from host
ports:
- 6379:6379
worker:
build: worker
environment:
- REDIS_HOST=redis_db
- REDIS_PORT=6379
depends_on:
- redis_db
If you find solution using redis connection string do share.
Thanks for your help

Answer 1

Setting network_mode: host disables Docker networking for a specific container. It's only necessary in some unusual situations where a container doesn't listen on a fixed port number or where you're trying to use a container to manage the host's network setup.
In your case, since the Redis database is disabling Docker networking, the application container can't reach it by name. Removing all of the network_mode: host options should address this.
Networking in Compose describes the overall network setup. Of note, Compose will create a default network for you, and containers will be reachable using their Compose service names. You shouldn't normally need to specify custom networks: options, explicitly provide a container_name:, set a hostname:, provide archaic links:, or set network_mode:.
You should be able to successfully trim the docker-compose.yml file you show down to:
version: "3.6"
services:
redis_db:
image: redis
# only needed to directly access Redis from host
ports:
- 6379:6379
worker:
build: worker
environment:
- REDIS_URL="redis://redis_db:6379"
# `docker-compose up worker` also starts Redis
# Not strictly needed for networking
depends_on:
- redis_db