数据库连接在 docker 撰写文件中停止工作

Question

这个docker-compos文件在六个月前工作正常。但是最近我尝试使用它来测试我的应用程序并收到此错误：

conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError: could not translate host name "db-test" to address: Name or service not known    

我通读了其他一些堆栈溢出答案，并尝试将"重新启动：始终"添加到 Web 服务中。我还尝试将本地网络添加到撰写文件中，但没有任何效果。知道我做错了什么吗？这是我的撰写文件：

version: '3'
services:
# postgres database
db-test:
image: postgres:10.9
environment:
- POSTGRES_PASSWORD=example
volumes:
- pg-test-data:/var/lib/postgresql/data
# main redis instance, used to store available years for each organization
redis-test:
image: redis:5.0.4
volumes:
- redis-test-data:/data
# redis cache used for caching agency pages like /agencies/salaries/
redis_cache-test:
image: redis:5.0.4
# search engine
elasticsearch-test:
image: elasticsearch:5.6.10
volumes:
- elasticsearch-test-data:/usr/share/elasticsearch/data
# web app
web-test:
build: .
environment:
- DATABASE_URL=postgresql://postgres:example@db-test/postgres
- ENVIRONMENT=development
- REDIS_URL=redis://redis-test:6379
- REDIS_CACHE_URL=redis://redis_cache-test:6379
- ELASTIC_ENDPOINT=elasticsearch-test:9200
env_file: docker.env
depends_on:
- db-test
- redis-test
- redis_cache-test
- elasticsearch-test
volumes:
- .:/code
# worker instance for processing large files in background
worker-test:
build: .
command: python run-worker.py
environment:
- DATABASE_URL=postgresql://postgres:example@db-test/postgres
- ENVIRONMENT=development
- REDIS_URL=redis://redis-test:6379
- REDIS_CACHE_URL=redis://redis_cache-test:6379
- ELASTIC_ENDPOINT=elasticsearch-test:9200
env_file: docker.env
depends_on:
- db-test
- redis-test
volumes:
- .:/code
volumes:
pg-test-data: {}
redis-test-data: {}
elasticsearch-test-data: {}

这是我的 Dockerfile：

FROM python:2.7.17
ENV PYTHONUNBUFFERED 1
RUN mkdir /code
WORKDIR /code
ADD . /code/
ADD requirements /requirements
RUN pip install -r /requirements/local.txt

Answer 1

我能够通过添加以下内容来解决此问题：

links:
- db-test:db-test

到网络测试服务。