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Redis – Unable to connect to Postgres database with Docker

I am running rails + Redis + Postgres with docker and I have managed to finally get everything working the only thing i can’t figure out is the database. it seems that no matter what I put for host/username/password I always end up with connection refused

here is my setup:

docker-compose.yml

version: '3.4'

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile
    depends_on:
      - database
      - redis
    ports:
      - "3000:3000"
    volumes:
      - .:/app
      - gem_cache:/usr/local/bundle/gems
    env_file: .env
    environment:
      RAILS_ENV: development

  database:
    image: postgres:12.1
    volumes:
      - db_data:/var/lib/postgresql/data
      - ./init.sql:/docker-entrypoint-initdb.d/init.sql
    environment:
      POSTGRES_USER: baopals
      POSTGRES_PASSWORD: baopals

  redis:
    image: redis:5.0.7

volumes:
  gem_cache:
  db_data:

networks:
  default:
    external:
      name: baopals-network

Dockerfile

FROM ruby:2.5.1-alpine

ENV BUNDLER_VERSION=1.16.1

RUN apk add --update --no-cache 
      binutils-gold 
      build-base 
      curl 
      file 
      g++ 
      gcc 
      git 
      less 
      libstdc++ 
      libffi-dev 
      libc-dev 
      linux-headers 
      libxml2-dev 
      libxslt-dev 
      libgcrypt-dev 
      make 
      netcat-openbsd 
      openssl 
      pkgconfig 
      postgresql-dev 
      python 
      tzdata 
      nodejs

RUN gem install bundler -v 1.16.1

WORKDIR /app

ADD vendor/gems/active_elastic_job-2.0.1 /app/vendor/gems/active_elastic_job-2.0.1

COPY Gemfile Gemfile.lock ./

RUN bundle config build.nokogiri --use-system-libraries

RUN bundle check || bundle install

COPY . ./

ENTRYPOINT ["./entrypoints/docker-entrypoint.sh"]

.env

DB_NAME=baopals_development
DB_USER=baopals
DB_PASSWORD=baopals
DB_HOST=localhost
REDIS_HOST=redis

database.yml

default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>

development:
  <<: *default
  database: baopals_development
  username: baopals
  password: baopals
  host: localhost
  port: 5432

and finally here is the error I end up with

app_1       | PG::ConnectionBad (could not connect to server: Connection refused
app_1       |   Is the server running on host "localhost" (127.0.0.1) and accepting
app_1       |   TCP/IP connections on port 5432?
app_1       | could not connect to server: Address not available
app_1       |   Is the server running on host "localhost" (::1) and accepting
app_1       |   TCP/IP connections on port 5432?

I am new with docker so im not sure if im just missing something obvious here

Tags:

2

Answers


  1. 0

    With Docker Compose, services (containers) automatically get a hostname identical to the service name. In your case the hostname for your Postgres service is database instead of localhost.

    See https://docs.docker.com/compose/networking/

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  2. 0

    When you want to connect to PostgreSQL server via docker then you have to start docker container you made for postgresql like this way
    sudo docker start mysql-55-container

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