Docker拒绝在我的本地主机：3000端口上工作

如何解决Docker拒绝在我的本地主机：3000端口上工作

这是我的docker-compose.yml 我正在尝试在本地项目上运行cypress，但拒绝在端口上运行。 我在做什么错了？

version: '3.2'
   
# run Cypress tests and exit with command
#   docker-compose up --exit-code-from cypress
services:
  cypress:
    # the Docker image to use from https://github.com/cypress-io/cypress-docker-images
    image: "cypress/included:5.0.0"
    environment:
      - CYPRESS_baseUrl=http://localhost:3000
    # share the current folder as volume to avoid copying
    working_dir: /e2e
     command: "--browser chrome"
     ports:
     - 3333:3000
     volumes:
       - ./:/e2e

compose-docker的结果

cypress_1  | 
cypress_1  | Cypress automatically waits until your server is accessible before running tests.
cypress_1  | 
cypress_1  | We will try connecting to it 3 more times...
cypress_1  | We will try connecting to it 2 more times...
cypress_1  | We will try connecting to it 1 more time...
cypress_1  | 
cypress_1  | Cypress failed to verify that your server is running.
cypress_1  | 
cypress_1  | Please start this server and then run Cypress again.
e2e_cypress_1 exited with code 1
Aborting on container exit...

我确定我的localhost：3000正在运行，我可以通过浏览器运行它。

解决方法

问题是该容器不知道您的localhost主机名，因为它在隔离的docker网络中运行。如果您想让容器知道您的本地网络，则必须Use host networking，并且容器的网络堆栈不会与Docker主机隔离。例如：

    version: '3.2'
    
    # run Cypress tests and exit with command
    #   docker-compose up --exit-code-from cypress
    services:
      cypress:
        # the Docker image to use from https://github.com/cypress-io/cypress-docker-images
        image: "cypress/included:5.0.0"
        environment:
          - CYPRESS_baseUrl=http://localhost:3000
        # share the current folder as volume to avoid copying
        working_dir: /e2e
        command: "--browser chrome"
        network_mode: "host"
        ports:
        - 3333:3000
        volumes:
          - ./:/e2e

,

在我的设置中，我使用docker-compose创建一个网络，然后我的服务使用该网络互相通信。我有一个node容器和另一个cypress容器。

networks:
  custom:
    driver: bridge

要通过docker运行cypress测试，我必须将cypress容器指向运行服务器的节点容器。在我的docker-compose中，节点容器称为node，它也是主机名。因此，我的docker-compose有一个CYPRESS_BASE_URL环境变量，它覆盖了http：// localhost：3000

的默认柏树baseUrl

services:
  node:
    image: ...
    container_name: node
    volumes:
      - ./:/home/node/app
    networks:
      - custom
    ports:
      - '3000:3000'
    ...other config

  cypress:
    image: ...
    container_name: cypress
    volumes:
      - ./:/home/node/app
    networks:
      - custom
    working_dir: /home/node/app
    environment:
      - DISPLAY=
      - CYPRESS_BASE_URL=http://node:3000/ -> I can't configure this,because I'm working with external API,I don't have access to API only via http://localhost:3000

cypress.json：

{
    "baseUrl": "http://localhost:3000/",...
}

要运行测试，我首先在节点容器中执行以启动节点服务器，该节点服务器侦听http：// localhost：3000，（http：// node：3000）

docker exec -it node bash

然后构建并运行您的项目（npm start）

然后在另一个终端中，执行到cypress容器中

docker exec -it cypress bash

然后运行测试：

cypress run

,

可以在配置文件（默认情况下为cypress.json）中设置

baseUrl-然后您可以在操作系统中设置一个环境变量以覆盖它，如下所示。

尝试使用CYPRESS_BASE_URL代替CYPRESS_baseUrl

并确保在docker-compose文件中使用network_mode: "host"。

另一种方法，您可以在baseUrl中定义crypess.json并将卷添加到Docker容器：

e2e-chrome:
  image: "cypress/included:4.1.0"
  # container_name: cypress
  # "cypress/included" images have entrypoint set to globally installed cypress
  # so the command can simply add any arguments
  command: "--browser chrome"
  volumes:
    - ./cypress.json:/cypress.json

引用：docker-compose.yml

version: '3.2'

# run Cypress tests and exit with command
#   docker-compose up --exit-code-from cypress
services:
  cypress:
    image: "cypress/included:5.2.0"
    environment:
      - CYPRESS_BASE_URL=http://host.docker.internal:3000
    working_dir: /user-management-ui
    #command: "--browser chrome"
    network_mode: "host"
    volumes:
      - ./:/user-management-ui