在 docker 中将 pgadmin 连接到 postgres

我有一个docker-compose与服务文件python, nginx, postgres and pgadmin:

services:
  postgres:
    image: postgres:9.6
    env_file: .env
    volumes:
      - postgres_data:/var/lib/postgresql/data
    ports:
      - "5431:5431"

  pgadmin:
    image: dpage/pgadmin4
    links:
      - postgres
    depends_on:
      - postgres
    environment:
      PGADMIN_DEFAULT_EMAIL: [email protected] /cdn-cgi/l/email-protection
      PGADMIN_DEFAULT_PASSWORD: pwdpwd
    volumes:
      - pgadmin:/root/.pgadmin
    ports:
      - "5050:80"

  backend:
    build:
      context: ./foobar  # This refs a Dockerfile with Python and Django requirements
    command: ["/wait-for-it.sh", "postgres:5431", "--", "/gunicorn.sh"]
    volumes:
      - staticfiles_root:/foobar/static
    depends_on:
      - postgres

  nginx:
    build:
      context: ./foobar/docker/nginx
    volumes:
      - staticfiles_root:/foobar/static
    depends_on:
      - backend
    ports:
      - "0.0.0.0:80:80"

volumes:
  postgres_data:
  staticfiles_root:
  pgadmin:

当我跑步时docker-compose up并参观localhost:5050，我看到pgadmin界面。当我尝试在那里创建一个新服务器时，localhost or 0.0.0.0作为主机名和5431作为端口，我收到错误“无法连接到服务器”。如果我删除这些并输入postgres在“服务”字段中，我收到错误“未找到服务“postgres”的定义”。我怎样才能连接到数据库pgadmin?

当您运行 docker-compose 为文件夹名称添加前缀（以保持容器名称唯一）时，docker 容器名称会发生​​变化。您可以使用以下命令强制指定容器的名称container_name财产

version: "3"
services:

  # postgres database
  postgres:
    image: postgres:12.3
    container_name: postgres
    environment:
      - POSTGRES_DB=admin
      - POSTGRES_USER=admin
      - POSTGRES_PASSWORD=admin
      - POSTGRES_HOST_AUTH_METHOD=trust # allow all connections without a password. This is *not* recommended for prod
    volumes:
      - database-data:/var/lib/postgresql/data/ # persist data even if container shuts down
    ports:
      - "5432:5432"

  # pgadmin for managing postgis db (runs at localhost:5050)
  # To add the above postgres server to pgadmin, use hostname as defined by docker: 'postgres'
  pgadmin:
    image: dpage/pgadmin4
    container_name: pgadmin
    environment:
      - PGADMIN_DEFAULT_EMAIL=admin
      - PGADMIN_DEFAULT_PASSWORD=admin
      - PGADMIN_LISTEN_PORT=5050
    ports:
      - "5050:5050"
  
volumes:
  database-data:

另一种选择是将 postgres 容器连接到 localhost

network_mode: host

但是这样你就失去了与 docker 良好的网络隔离