node.js - 如何将 docker 容器端口公开给另一个容器

Question

我有一个依赖于 selenium 作为链接服务的 docker 容器(也是一个 docker 容器)。这个 docker 容器仅使用 selenium 服务作为主机来 headless 运行 nightwatchJS 测试。 selenium 服务启动正常，但是当 nightwatch 测试尝试在 docker 容器内运行时，我在 selenium 服务端口(4444)上收到拒绝连接错误。我可以使用curl 在此端口访问selenium 主机，如果我不通过docker 运行测试，也可以在其上运行nightwatch 测试。这是我的 docker compose yaml 文件:

services:
  selenium:
    image: selenium/standalone-chrome
    ports:
      - "4444:4444"
  nightwatch:
    build: .
    volumes:
      - .:/home/client_test
    links:
      - selenium
    environment:
      selenium: 4444
    expose:
      - "4444"

和我的 Docker 文件:

#
#Nightwatch.js Dockerfile
#

FROM alpine:3.4



WORKDIR /home/client-tests
ADD . /home/client-tests/
ENV NODE_PATH=/home/client-app/node_modules
#RUN apk add 'firefox-esr<45.6.0-r0'

#install firefox

#RUN wget -c http://ftp.mozilla.org/pub/firefox/releases/45.8.0esr/firefox-45.8.0esr.linux-x86_64.sdk.tar.bz2 -P /usr/local
#RUN tar xvjf /usr/local/firefox-45.8.0esr.linux-x86_64.sdk.tar.bz2
#RUN ln -s /usr/local/firefox/firefox /usr/local/bin/




RUN apk --no-cache --update add  bash \
    # Install tini, a tiny but valid init for containers
    tini \
    # Install nodejs
    nodejs-lts \
    #Install java
    openjdk8-jre-base \
    #Install chrome
    chromium \
    chromium-chromedriver \
    #Install firefox
    #firefox \
    unzip \
    wget \
    xvfb \

    dbus \
    tar \
    # Install other dependencies
    && npm install -g nightwatch  \
#   -g request \
#   chai \
#   superagent \
    # Clean up obsolete files:
    && rm -rf \
        /tmp/* \
        /root/.npm

#RUN apk update -q && apk add --no-cache xvfb firefox-esr dbus
#ADD https://gist.github.com/elbaschid/5a91271c07bb0de7bfa6/raw/d07b4eecf02fd3341ef72753e4c5875cf137bda8/xvfb-run.sh /usr/bin/xvfb-run
#RUN chmod u+x /usr/bin/xvfb-run
#
RUN npm install request
RUN npm install chai
RUN npm install superagent
EXPOSE 4444
#
##Fetch the chrome drive for linux
#RUN rm -rf /home/client-app/bin/chromedriver
#RUN rm -rf /home/client-app/bin/geckodriver
#
#RUN wget -c http://chromedriver.storage.googleapis.com/2.28/chromedriver_linux64.zip -P /tmp
#RUN unzip /tmp/chromedriver_linux64.zip -d /tmp
#RUN chmod +x /tmp/chromedriver
#RUN mv -f /tmp/chromedriver /home/client-app/bin/chromedriver
#
##get the gecko driver for linux
#RUN wget https://github.com/mozilla/geckodriver/releases/download/v0.16.1/geckodriver-v0.16.1-linux64.tar.gz -P /tmp
#RUN tar xvzf /tmp/geckodriver-v0.16.1-linux64.tar.gz -C /tmp
#RUN chmod 755 /tmp/geckodriver
#RUN mv -f /tmp/geckodriver /home/client-app/bin/geckodriver

#CMD xvfb-run -e java -Dwebdriver.chrome.driver=./bin/chromedriver -jar ./bin/selenium-server-standalone-3.4.0.jar &; nightwatch -e chrome -t tests/*'
CMD nightwatch -e chrome -t tests/loginTest.js

这是我的 nightwatchJS json 文件，它指定了主机(出于隐私原因更改了 URL)

{
  "src_folders" : ["./tests"],
  "output_folder" : "./reports",
  "custom_commands_path" : "./custom-commands",
  "page_objects_path" : "",
  "custom_assertions_path" : "",
  "globals_path" : "./globals.js",
  "live_output" : false,
  "parallel_process_delay" : 10,
  "disable_colors": false,
  "test_workers" : true,

  "selenium" : {
    "start_process" : false,
    "server_path" : "./bin/selenium-server-standalone-3.4.0.jar",
    "log_path" : "",
    "host" : "127.0.0.1",
    "port" : 4444,
    "cli_args" : {
      "webdriver.gecko.driver" : "./bin/geckodriver",
      "webdriver.chrome.driver" : "./bin/chromedriver",
      "webdriver.ie.driver" : "./bin/IEDriverServer.exe"
    }
  },

  "test_settings" : {
    "default" : {
      "launch_url" : "https://google.com",
      "selenium_host" : "hub",
      "selenium_port" : 4444,
      "silent" : true,
      "disable_colors": false,
      "screenshots" : {
        "enabled" : true,
        "path" : "./screenshots"
      },
      "desiredCapabilities" : {
        "browserName" : "firefox",
        "javascriptEnabled" : true,
        "acceptSslCerts" : true,
        "acceptInsecureCerts" : true,
        "applicationCacheEnabled" : true
      }
    },

    "chrome" : {
      "launch_url" : "https://google.com/",
      "selenium_host" : "0.0.0.0",
      "selenium_post" : 4444,
      "disable_colors" : false,
      "screenshots" : {
        "enabled" : false,
        "path" : ""
      },
      "desiredCapabilities" : {
        "browserName" : "chrome",
        "javascriptEnabled" : true,
        "acceptSslCerts" : true,
        "acceptInsecureCerts" : true,
        "chromeOptions": {
          "args": [ "--no-sandbox"]
        }
      }
    },


    "IE" : {
      "launch_url" : "https://google.com/",
      "selenium_host" : "fakeURLFORSTACK.com",
      "selenium_post" : 4444,
      "disable_colors" : false,
      "screenshots" : {
        "enabled" : false,
        "path" : ""
      },
      "desiredCapabilities" : {
        "browserName" : "internet explorer",
        "javascriptEnabled" : true,
        "acceptSslCerts" : true,
        "acceptInsecureCerts" : true
      }
    },


    "saucelabs" : {
      "selenium_host" : "ondemand.saucelabs.com",
      "selenium_port" : 80,
      "username" : "${SAUCE_USERNAME}",
      "access_key" : "${SAUCE_ACCESS_KEY}",
      "use_ssl" : false,
      "silent" : true,
      "output" : true,
      "screenshots" : {
        "enabled" : false,
        "on_failure" : true,
        "path" : ""
      },
      "desiredCapabilities": {
        "name" : "test-example",
        "browserName": "firefox"
      },
      "globals" : {
        "myGlobal" : "some_sauce_global"
      },
      "selenium" : {
        "start_process" : false
      }
    },

    "phantomjs" : {
      "desiredCapabilities" : {
        "browserName" : "phantomjs",
        "javascriptEnabled" : true,
        "acceptSslCerts" : true,
        "acceptInsecureCerts" : true,
        "phantomjs.binary.path" : "phantomjs"
      }
    },

    "browserstack" : {
      "selenium" : {
        "start_process" : false
      },
      "selenium_host" : "hub.browserstack.com",
      "selenium_port" : 80,
      "silent" : true,
      "desiredCapabilities": {
        "name" : "test-example",
        "browserName": "firefox",
        "browserstack.user" : "...",
        "browserstack.key" : "..."
      }
    },

    "testingbot" : {
      "selenium_host" : "hub.testingbot.com",
      "selenium_port" : 80,
      "apiKey" : "${TB_KEY}",
      "apiSecret" : "${TB_SECRET}",
      "silent" : true,
      "output" : true,
      "screenshots" : {
        "enabled" : false,
        "on_failure" : true,
        "path" : ""
      },
      "desiredCapabilities": {
        "name" : "test-example",
        "browserName": "firefox"
      },
      "selenium" : {
        "start_process" : false
      }
    }
  }
}

如何允许在一个 docker 容器中运行的 nightwatch 测试利用在端口 4444 上的另一个 docker 容器中运行的 selenium 主机？

Answer 1

每个容器都有自己的网络。每个都有 eth0 和 lo (localhost) 接口(interface)，位于 Docker 的网络中。

因此，您的 selenium 不在 Nighwatch 应用程序的本地主机中。它可以这样使用:

selenium:4444

该主机名被转换为与 selenium 容器相对应的正确 IP。因此，请根据该信息调整您的脚本和配置。

您可以使用以下命令查找并检查 docker 网络:

docker network ls
docker network inspect <network-id>