Elixir+docker与postgres的连接被拒绝

Question

postgres-db 2021-02-23 22:46:3.410 UTC[1]日志：数据库系统已准备好接受连接

.环境：

DB_NAME=spiritpay-dev
DB_USER=postgres
DB_HOST=localhost
DB_PASS=12345

Docker-compose：

version: "3.7"
services:
  app:
      restart: on-failure
      environment: 
        DB_USER: postgres
        DB_PASSWORD: 12345
        DB_NAME: spiritpay-dev
        DB_HOST: postgres-db
      build: .
      command: /bin/sh docker-entrypoint.sh
      ports: 
        - "4000:4000"
      depends_on: 
        - postgres-db 
      links:
        - postgres-db
  postgres-db:
      image: "postgres:12"
      restart: always
      container_name: "postgres-db"
      environment: 
        POSTGRES_PASSWORD: ${DB_PASS}
        POSTGRES_USER: ${DB_USER}
        POSTGRES_DB: ${DB_NAME}
      ports: 
        - "5433:5433"

use Mix.Config

# Configure your database
config :spiritpay, Spiritpay.Repo,
  username: "postgres",
  password: "12345",
  database: "spiritpay-dev",
  hostname: "postgres-db",
  port: 5433,
  show_sensitive_data_on_connection_error: true,
  pool_size: 10

# For development, we disable any cache and enable
# debugging and code reloading.
#
# The watchers configuration can be used to run external
# watchers to your application. For example, we use it
# with webpack to recompile .js and .css sources.
config :spiritpay, SpiritpayWeb.Endpoint,
  http: [port: 4000],
  debug_errors: true,
  code_reloader: true,
  check_origin: false,
  watchers: []

# ## SSL Support
#
# In order to use HTTPS in development, a self-signed
# certificate can be generated by running the following
# Mix task:
#
#     mix phx.gen.cert
#
# Note that this task requires Erlang/OTP 20 or later.
# Run `mix help phx.gen.cert` for more information.
#
# The `http:` config above can be replaced with:
#
#     https: [
#       port: 4001,
#       cipher_suite: :strong,
#       keyfile: "priv/cert/selfsigned_key.pem",
#       certfile: "priv/cert/selfsigned.pem"
#     ],
#
# If desired, both `http:` and `https:` keys can be
# configured to run both http and https servers on
# different ports.

# Do not include metadata nor timestamps in development logs
config :logger, :console, format: "[$level] $message\n"

# Set a higher stacktrace during development. Avoid configuring such
# in production as building large stacktraces may be expensive.
config :phoenix, :stacktrace_depth, 20

# Initialize plugs at runtime for faster development compilation
config :phoenix, :plug_init_mode, :runtime

日志：

app_1 22:46:31.020[error]GenServer#PID<0.368.0>终止app_1**(dbconnection.connectionerror）tcp连接(postgres-DB:5433):连接拒绝-：econndelection app_1
(db_connection2.3.1)lib/db_connection/connection.ex:100:dbconnection.connection/2 app_1（connection 1.1.0)lib/connection.ex:622:connection.enter_connect/5 app_1(stdlib_1**（混合）无法删除Spiritpay.repo的数据库：杀死app_1[错误]postgrex.协议(#pid<0.330.0>)连接失败:**(dbconnection.connectionerror）tcp连接（postgres-db：5433）：连接被拒绝-：econndelection

Answer 1

第一点：

请尝试在.env中用postgres-db替换localhost,因为数据库的主机就是这样。docker compose将内部主机映射到服务名称

文件摘录：

services:
  app:
      restart: on-failure
      build: .
      command: /bin/sh docker-entrypoint.sh
      ports: 
        - "4000:4000"
      depends_on: 
        - postgres-db 
      links:
        - postgres-db
      env_file:
         - .env

null

要点3

您使用的端口号是错误的postgres在5432上操作

第四点：

    ports:
      - 0.0.0.0:5432:5432