Docker – Rails应用程序无法连接到链接的Postgres容器（似乎没有运行）

我一直在遵循如何使用Docker 设置 Rails开发环境的指南：使用Docker 设置Rails开发环境 。

我一路上碰到了一些问题，但是我已经设法完成了大部分工作，直到运行Rails迁移。 运行命令docker-compose run web rake db:migrate产生以下结果：

 rake aborted! PG::ConnectionBad: 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? 

泊坞窗，compose.yml：

 version: '2' services: db: image: postgres volumes: - ./pgdata:/pgdata environment: POSTGRES_DB: myapp_development POSTGRES_USER: postgres POSTGRES_PASSWORD: PGDATA: /pgdata web: build: . command: bundle exec rails server --port 5000 --binding 0.0.0.0 volumes_from: - container:myapp-web-sync:rw - container:myapp-bundle-sync:rw volumes: - ./keys:/root/.ssh/ ports: - "5000:5000" environment: REDIS_URL: redis://redis:6379 GEM_HOME: /bundle links: - db - redis volumes: myapp-web-sync: external: true myapp-bundle-sync: external: true 

Answer 1

您尝试连接到localhost:5432换句话说，您尝试连接到web容器，但您的观点是db 。 只需在应用程序中指定数据库主机，如db