我启动了一个 Docker 容器:
docker run -d --shm-size="4g"--hostname selenium_firefox selenium/standalone-firefox
在另一个装有 Python 的容器中:
...
>>> driver = webdriver.Remote(command_executor="http://" +selenium_host+":4444/w
d/hub", desired_capabilities=DesiredCapabilities.FIREFOX, keep_alive=True)
>>> driver.title
''
>>> driver.title
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.10/site-packages/selenium/webdriver/remote/webdri
ver.py", line 447, in title
resp = self.execute(Command.GET_TITLE)
File "/usr/local/lib/python3.10/site-packages/selenium/webdriver/remote/webdri
ver.py", line 424, in execute
self.error_handler.check_response(response)
File "/usr/local/lib/python3.10/site-packages/selenium/webdriver/remote/errorh
andler.py", line 247, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: Unable to execute reques
t for an existing session: Unable to find session with ID: 5c619451-8361-4ec9-9b
7e-58b7afac15ff
Build info: version: '4.1.1', revision: 'e8fcc2cecf'
System info: host: 'selenium_firefox', ip: '172.17.0.3', os.name: 'Linux', os.ar
ch: 'amd64', os.version: '5.4.0-89-generic', java.version: '11.0.13'
Driver info: driver.version: unknown
第一个 driver.title 我在创建远程 webdriver 后立即运行它。
然后我等了一段时间(大约15分钟)，再次运行driver.title，Python控制台似乎已经失去了与相应浏览器的连接。
为什么会发生这种情况，我该如何避免？如果我不使用远程网络驱动程序，则不会发生这种情况。
最佳答案
选项 1:覆盖 Docker Selenium Grid 默认 session 超时
来自 docker/selenium 文档:
Grid has a default session timeout of 300 seconds, where the session can be on a stale state until it is killed. You can use SE_NODE_SESSION_TIMEOUT to overwrite that value in seconds.
docker run -d -e SE_NODE_SESSION_TIMEOUT=1000 --shm-size="4g" --hostname selenium_firefox selenium/standalone-firefox
选项 2:每 60(任何 < 300)秒 Ping 一次您的 session
你可以在空闲时间循环执行一些驱动命令
for x in range(15):
time.sleep(60)
driver.current_url
引用
https://github.com/SeleniumHQ/docker-selenium#grid-url-and-session-timeout
关于python - Selenium:闲置几分钟后为 "Unable to find session with ID"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/70794535/