postgresql - Docker 容器中的 Django 应用程序无法找到 postgres

Question

我在 gitlab 上有一个 Django 应用程序，我正在尝试使用 gitlab-ci 添加 CI/CD。我在 EC2 上启动了一个服务器并在上面安装了 gitlab-runner。

我将 .gitlab-ci.yml 文件添加到我的项目中并推送了最新的更改。我可以看到正在运行的管道和正在安装的依赖项。但是当脚本尝试运行测试时，我收到如下错误:

django.db.utils.OperationalError: could not connect to server: Connection refused

Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432?

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?

下面是我的.gitlab-ci.yaml脚本:

image: python:3-jessie

services:
  - postgres:latest

before_script:
  - python -V
  - apt-get -y update
  - apt-get install -y python-dev python-pip
  - pip install --upgrade pip

stages:
  - build

build:
  type: build
  variables:
    DATABASE_URL: postgres://postgres:@postgres:5432/opensys_erp
  script:
  - pip install -r requirements.txt
  - python manage.py test
  only:
  - branches

为什么我的应用程序无法连接到 postgres 服务器？

Answer 1

当您的容器尝试在他们自己的本地主机上连接 postgres 时，这就是您拒绝连接的原因。 127.0.0.1 这个localhost是Django application容器的localhost。要使用本地主机连接 postgress，您需要链接您的 docker 容器。

Docker also has a linking system that allows you to link multiple containers together and send connection information from one to another. When containers are linked, information about a source container can be sent to a recipient container.

服务如何与工作联系起来

To summarize, if you add mysql as service to your application, the image will then be used to create a container that is linked to the job container.

The service container for MySQL will be accessible under the hostname mysql. So, in order to access your database service you have to connect to the host named mysql instead of a socket or localhost.

在我针对同一类问题发布详细答案的前一天，您也可以查看此问题。

https://stackoverflow.com/a/49342027/3288890

你可以查看一些链接

https://docs.docker.com/network/links/

https://docs.gitlab.com/ce/ci/docker/using_docker_images.html

https://docs.gitlab.com/ce/ci/docker/using_docker_images.html#accessing-the-services