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Docker Compose – Redis container refusing connection to Node container

No matter what I try I can’t seem to get my node app to connect to redis between containers within the same docker-compose yml config. I’ve seen a lot of similar questions but none of the answers seem to work.

I’m using official images in both cases, not building my own

I am putting “redis” as my host and setting it as hostname in my docker compose YML config

const client = redis.createClient({ host: "redis" });

in my redis.conf I am using bind 0.0.0.0

This what the console is printing out:

 Redis connection to redis:6379 failed - getaddrinfo ENOTFOUND redis redis:6379

 Error: connect ECONNREFUSED 127.0.0.1:6379
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1107:14)
  errno: 'ECONNREFUSED',
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
port: 6379 
}

This is my docker-compose.yml

version: '3'
services:
  server:
    image: "node:10-alpine"
    working_dir: /usr/src/app
    user: "node"
    command: "npm start"
    volumes:
      - .:/usr/src/app
    ports:
      - '3000:3000'
      - '3001:3001'
      - '9229:9229' # Node debugging port
    environment:
      - IS_DOCKER=1
      - NODE_ENV=DEVELOPMENT
    depends_on:
      - db

  db:
    image: "redis:5.0-alpine"
    expose:
      - '6379'
    volumes:
      - ./redis.conf:/usr/local/etc/redis/redis.conf
      - redis-data:/data
    command:
      - redis-server
      - /usr/local/etc/redis/redis.conf
    hostname: redis

volumes:
  redis-data:

UPDATE

Here’s my redis.conf, it’s not much. 

bind 0.0.0.0
appendonly yes
appendfilename "my_app.aof"
appendfsync always

UPDATE 2

Things I’ve noticed and tried

  • in my original setup, when I run docker inspect I can see they are both joined to the same network. when I exec…/bin/bash into the redis container I can successfully ping the server container but when I’m in the server container it can not ping the redis one.

  • network_mode: bridge -adding that to both containers does not work

I did get one baby step closer by trying out this: 

server:
   network_mode: host
redis:
   network_mode: service:host

I’m on a Mac and in order to get host mode to work you need to do that. It does work in the sense that my server successfully connects to the redis container. However, hitting localhost:3000 does not work even though I’m forwarding the ports

Tags:

2

Answers


  1. 0 
    version: '3'
services:
  server:
    image: "node:10-alpine"
    #network_mode: bridge
    #links is necessary if you use network_mode: bridge
    #links: [redis]
    networks:
      - default
    working_dir: /usr/src/app
    user: "node"
    command: "npm start"
    volumes:
      - .:/usr/src/app
    ports:
      - '3000:3000'
      - '3001:3001'
      - '9229:9229' # Node debugging port
    environment:
      - IS_DOCKER=1
      - NODE_ENV=DEVELOPMENT
    depends_on:
      - redis

  redis:
    image: "redis:5.0-alpine"
    #container_name: redis
    #network_mode: bridge
    networks:
      - default
    expose:
      - '6379'
    volumes:
      - ./redis.conf:/usr/local/etc/redis/redis.conf
      - redis-data:/data
    command:
      - redis-server
      - /usr/local/etc/redis/redis.conf

volumes:
  redis-data:

networks:
  default:

    Rename the container to the hostname you want to use: redis in your case instead of db.
    To make it accessible over the docker network you will have to put them on the same network like above or use network_mode: bridge and links: [redis] instead.

    Try this to test your network:
    docker ps to get the current container id or running name from the server container
    docker exec -it id/name /bin/sh
    Now you have a shell inside server and should be able to resolve redis via:
    ping redis or nc -zv redis 6379

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  2. 0

    For those who still getting this error
    i found that in new versions of redis – 4 and up
    you need to configure the client like this:

    const client = createClient({
  socket: {
    host: host,
     port: process.env.REDIS_PORT,
   },
});

    it solved my problem

    then in docker compose file you don’t need to specify ports

    version: "3.4"
services:
  redis-server:
    image: "redis:latest"
    restart: always
  api:
    depends_on:
      - redis-server
    restart: always
    build: .
    ports:
      - "5000:5000"
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