Docker：服务器是否在主机“ localhost”上运行？ （:: 1）并在端口5432上接受TCP / IP连接？ [英] Docker: Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432?

问题描述

在使用Ruby on Rail在本地系统上设置和运行docker实例时遇到问题。请查看我的docker配置文件：-

I am getting issues while setup and run the docker instance on my local system with Ruby on Rail. Please see my docker configuration files:-

Dockerfile

Dockerfile

FROM ruby:2.3.1

RUN useradd -ms /bin/bash web
RUN apt-get update -qq && apt-get install -y build-essential
RUN apt-get -y install nginx
RUN apt-get -y install sudo
# for postgres
RUN apt-get install -y libpq-dev

# for nokogiri
RUN apt-get install -y libxml2-dev libxslt1-dev

# for a JS runtime
RUN apt-get install -y nodejs
RUN apt-get update

# For docker cache
WORKDIR /tmp 
ADD ./Gemfile Gemfile
ADD ./Gemfile.lock Gemfile.lock
ENV BUNDLE_PATH /bundle
RUN gem install bundler --no-rdoc --no-ri
RUN bundle install
# END
ENV APP_HOME /home/web/cluetap_app
RUN mkdir -p $APP_HOME
WORKDIR $APP_HOME
ADD . $APP_HOME
RUN chown -R web:web $APP_HOME
ADD ./nginx/nginx.conf /etc/nginx/
RUN unlink /etc/nginx/sites-enabled/default
ADD ./nginx/cluetap_nginx.conf /etc/nginx/sites-available/
RUN ln -s /etc/nginx/sites-available/cluetap_nginx.conf /etc/nginx/sites-enabled/cluetap_nginx.conf
RUN usermod -a -G sudo web

docker-compose.yml

docker-compose.yml

version: '2'
services:
  postgres:
    image: 'postgres:9.6'
    environment:
      - PGDATA=/var/lib/postgresql/data/pgdata
      - POSTGRES_PASSWORD=
      - POSTGRES_USER=postgres
      - POSTGRES_HOST=cluetapapi_postgres_1
    networks:
      - default
      - service-proxy
    ports:
      - '5432:5432'
    volumes:
      - 'postgres:/var/lib/postgresql/data'
    labels:
      description: "Postgresql Database"
      service: "postgresql"
  web:
    container_name: cluetap_api
    build: .
    command: bash -c "thin start -C config/thin/development.yml && nginx -g 'daemon off;'"
    volumes:
      - .:/home/web/cluetap_app
    ports:
      - "80:80"
    depends_on:
      - 'postgres'
networks:
  service-proxy:
volumes:
  postgres:

当我运行 docker-compose build 和 docker-compose up -d 这两个命令可以成功运行，但是当我从url中命中它时，它会显示内部服务器错误，并且错误是

When I have run docker-compose build and docker-compose up -d these two commands it run succesfully but when I have hit from the url the it thorught internal server error and the error is

Unexpected error while processing request: could not connect to server: Connection refused
    Is the server running on host "localhost" (127.0.0.1) and accepting
    TCP/IP connections on port 5432?
could not connect to server: Cannot assign requested address
    Is the server running on host "localhost" (::1) and accepting
    TCP/IP connections on port 5432?

我已经应用了一些解决方案，但对我不起作用，请指导我，我是docker新手

I have applied some solution but it did not work for me, please guide me I am new to docker and AWS.

推荐答案

问题是您正在尝试连接数据库容器中的localhost。您对postgres 5432：5432 执行的端口映射将5432映射到主机的本地主机。

The issue is that you are trying to connect to localhost inside the container for DB. The port mapping that you do 5432:5432 for postgres map 5432 to localhost of your host machine.

现在您的 web 容器代码正在容器内运行。并且在其localhost：5432上没有任何内容。

Now your web container code is running inside the container. And there is nothing on its localhost:5432.

因此，您需要在配置中更改连接详细信息以连接到 postgres：5432 ，这是因为您将postgres DB服务命名为 postgres

So you need to change your connection details in the config to connect to postgres:5432 and this is because you named the postgres DB service as postgres

对此进行了更改，工作。

Change that and it should work.

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