Rails 6 Docker 与 PostgreSQL 连接错误

Question

I'm currently starting with Docker and trying to adapt my first application with a Docker- and a Docker-compose file.

It seems to work fine, until I reach the point where I want to create my database. I set up the environment variables correctly and reflected them in my database.yml file

# .env

POSTGRES_USER='deploy'
POSTGRES_PASSWORD='deploy'
POSTGRES_DB='nkbrf_db'

    # database.yml

    default: &default
      adapter: postgresql
      encoding: unicode
      pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
      username: <%= ENV['POSTGRES_USERNAME'] %>
      password: <%= ENV['POSTGRES_PASSWORD'] %>
      database: <%= ENV['POSTGRES_DB'] %>
      host: db

    development:
      <<: *default

    test:
      <<: *default

production:
  <<: *default

Here's my docker-compose.yml:

version: '3'
services:
    db:
        image: postgres
        volumes:
        - 'postgres:/var/lib/postgresql/data'
        env_file:
            - '.env'
        ports: 
        - "5432"
    web:
        build: .
        command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
        volumes:
            - .:/nkbrfqm
            - bundler_gems:/bundle
        ports:
            - "3000:3000"
        environment:
            RAILS_ENV: development
        depends_on:
            - db
volumes:
    postgres:
    bundler_gems:

It sets up everything correctly but if I try to create my database with

docker-compose run web rake db:create

I get the following error:

PG::ConnectionBad: FATAL: password authentication failed for user "root"

Where does this user "root" come from? Is something wrong with my environment variable settings?

Answer 1

You need to remove single-quote ' in the .env file then you need to remove all containers in the compose file( docker-compose rm ). then execute docker-compose up -d

Example

#.env

POSTGRES_USER=deploy POSTGRES_PASSWORD=deploy POSTGRES_DB=nkbrf_db

Thanks