树莓派3B+通过crontab启动Selenium脚本异常退出求助

问题背景 #

在树莓派3B+上，设备通过HDMI连接屏幕，位于/home/pi/Documents/目录下的Selenium Python脚本在终端中可正常运行，但通过crontab执行时失败。

脚本代码（test2.py） #

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.chrome.service import Service

chrome_options = Options()
chrome_options.BinaryLocation = "/usr/lib/chromium-browser"
driver_path = "/usr/lib/chromium-browser/chromedriver"
chrome_options.add_argument('disable-infobars')
chrome_options.add_argument("--kiosk")
chrome_options.add_argument("--disable-dev-shm-usage")
driver = webdriver.Chrome(service=Service(driver_path), options=chrome_options)

driver.get("https://www.google.com")

当前crontab配置 #

* * * * * /usr/bin/python3 /home/pi/Documents/test2.py > /home/pi/Documents/logs.txt 2>&1

错误日志（logs.txt） #

Traceback (most recent call last):   File
"/home/pi/Documents/test2.py", line 11, in <module>
    driver = webdriver.Chrome(service=Service(driver_path), options=chrome_options)   File
"/usr/local/lib/python3.9/dist-packages/selenium/webdriver/chrome/webdriver.py",
line 80, in __init__
    super().__init__(   File "/usr/local/lib/python3.9/dist-packages/selenium/webdriver/chromium/webdriver.py",
line 104, in __init__
    super().__init__(   File "/usr/local/lib/python3.9/dist-packages/selenium/webdriver/remote/webdriver.py",
line 286, in __init__
    self.start_session(capabilities, browser_profile)   File "/usr/local/lib/python3.9/dist-packages/selenium/webdriver/remote/webdriver.py",
line 378, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)   File "/usr/local/lib/python3.9/dist-packages/selenium/webdriver/remote/webdriver.py",
line 440, in execute
    self.error_handler.check_response(response)   File "/usr/local/lib/python3.9/dist-packages/selenium/webdriver/remote/errorhandler.py",
line 245, in check_response
    raise exception_class(message, screen, stacktrace) selenium.common.exceptions.WebDriverException: Message: unknown error:
Chrome failed to start: exited abnormally.   (unknown error:
DevToolsActivePort file doesn't exist)   (The process started from
chrome location /usr/bin/chromium-browser is no longer running, so
ChromeDriver is assuming that Chrome has crashed.)

已尝试的调试方法 #

• 将代码中的驱动路径替换为/usr/bin/chromiumdriver
• 将代码中的BinaryLocation替换为/usr/bin/chromium-browser
• 在crontab中添加DISPLAY=:0
• 在crontab中添加自定义PATH
• 在crontab中添加终端echo $PATH的返回值作为PATH
• 重新安装selenium
• 安装webdriver-manager

解决方案 #

1. 修正Chrome启动参数 #

编辑test2.py，补充必要的Chrome选项解决DevToolsActivePort和权限问题：

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.chrome.service import Service

chrome_options = Options()
# 树莓派上Chromium的正确路径通常为/usr/bin/chromium-browser
chrome_options.BinaryLocation = "/usr/bin/chromium-browser"
driver_path = "/usr/bin/chromedriver"  # 对应chromedriver的正确路径

# 添加关键参数
chrome_options.add_argument('disable-infobars')
chrome_options.add_argument("--kiosk")
chrome_options.add_argument("--disable-dev-shm-usage")
chrome_options.add_argument("--no-sandbox")  # 禁用沙箱，解决crontab环境下权限限制
chrome_options.add_argument("--display=:0")  # 指定显示端口
chrome_options.add_argument("--user-data-dir=/home/pi/.config/chromium")  # 指定用户数据目录，避免会话冲突

driver = webdriver.Chrome(service=Service(driver_path), options=chrome_options)
driver.get("https://www.google.com")

2. 完善crontab环境配置 #

执行crontab -e编辑定时任务，添加XAUTHORITY环境变量确保crontab能访问X会话：

* * * * * DISPLAY=:0 XAUTHORITY=/home/pi/.Xauthority /usr/bin/python3 /home/pi/Documents/test2.py > /home/pi/Documents/logs.txt 2>&1

• XAUTHORITY指向当前用户的X认证文件，解决crontab无X会话权限的问题

3. 验证Chromium与ChromeDriver版本匹配 #

执行以下命令检查版本：

chromium-browser --version
chromedriver --version

确保两者主版本号一致，若不匹配，重新下载对应版本的chromedriver替换现有文件。

4. 检查脚本权限 #

确保脚本具备执行权限：

chmod +x /home/pi/Documents/test2.py

内容的提问来源于stack exchange，提问作者Jack Bow