selenium.common.exceptions.WebDriverException: Message: unknown error: Chrome failed to start: exite

用python写了个爬虫，pycharm中运行正常，linux下crontab运行报错

linux下运行报错：

    selenium.common.exceptions.WebDriverException: Message: unknown error: Chrome failed to start: exite

先执行一下两句安装命令（以ubuntu为例）：

    sudo pip install pyvirtualdisplay

    sudo apt-get install xvfb

然后添加如下代码：

    from pyvirtualdisplay import Display

    display = Display(visible=0, size=(800, 800))

    display.start()

    driver = webdriver.Chrome()