Selenium Chromedriver Hangs? - python

I have a long running python app that will periodically (every 30-60 seconds) open a webpage with selenium and chrome driver, run some javascript and take a screenshot. Its running on an EC2 ubuntu instance with chrome in Xvfb and for the most part everything is working, except intermittently the program will hang. It is happening on one of these lines:
options = Options()
options.add_argument("--disable-web-security")
options.add_argument("--webdriver-logfile=webdrive.log")
dc = DesiredCapabilities.CHROME
dc['loggingPrefs'] = {'browser': 'ALL'}
driver = webdriver.Chrome(chrome_options=options, desired_capabilities=dc)
driver.get(url);
(I don't have an exact line but I know from debug statements I have put in that it is somewhere in between here)
Unfortunately, the program doesn't crash so it doesn't have any error messages, its just waiting endlessly since 7pm last night. Running strace -p 'python program pid' returns: wait4(-1, and running strace -p 'chromedriver pid' returns recvfrom(20,
I can see in ps axjf that the process is still running, its just not doing anything. I'm sort of at a loss of what to do now, any suggestions?
chromedriver version: 2.10.267518
Google Chrome 40.0.2214.111
Selenium (installed with pip): 2.42.1
#https://github.com/cgoldberg/xvfbwrapper
xvfb = Xvfb(width=1920, height=1920)
xvfb.start()
---- EDIT ----
I have just updated to ChromeDriver 2.14.313457 and Selenium 2.44.0, hopefully this will fix the issue. I'm going to leave this open for now. Thanks for the advice so far guys!
---- EDIT ----
So the service still ended up hanging. I'm wondering if this is because for every screenshot I close and restart google-chrome? Is this possibly causing a memory leak somehow? How could I diagnose this?

I ran into a similar issue and found the answer here and blogged about it here. Setting the environment variable DBUS_SESSION_BUS_ADDRESS=/dev/null worked for me without having to restart Xvfb all the time.

I never found out the specific piece of code that was causing this problem, but creating a fresh instance of Xvfb with each driver load seems to have fixed it. Perhaps there is a memory leak somewhere in the interaction between selenium and Xvfb? Either way, marking this as closed.

In my case, the problem disappeared enclosing the call within a with block, like this:
options = Options()
path = f"{os.environ['LOCALAPPDATA']}{os.path.sep}Programs{os.path.sep}Chromium{os.path.sep}Win_x64{os.path.sep}1012736{os.path.sep}"
options.binary_location = f"{path}chrome-win{os.path.sep}chrome.exe"
executable_path = f"{path}chromedriver_win32{os.path.sep}chromedriver.exe"
with webdriver.Chrome(chrome_options=options, executable_path=executable_path) as browser:
browser.get("https://live.euronext.com/en/products/equities")
sleep(3)
Selenium 4.4.0, Python 3.10, Windows 10, ChromeDriver and Chromium 104.0.5112.0

Related

Error while using Selenium: DevToolsActivePort file doesn't exist [duplicate]

I am trying to launch chrome with an URL, the browser launches and it does nothing after that.
I am seeing the below error after 1 minute:
Unable to open browser with url: 'https://www.google.com' (Root cause: org.openqa.selenium.WebDriverException: unknown error: DevToolsActivePort file doesn't exist
(Driver info: chromedriver=2.39.562718 (9a2698cba08cf5a471a29d30c8b3e12becabb0e9),platform=Windows NT 10.0.15063 x86_64) (WARNING: The server did not provide any stacktrace information)
My configuration:
Chrome : 66
ChromeBrowser : 2.39.56
P.S everything works fine in Firefox
Thumb rule
A common cause for Chrome to crash during startup is running Chrome as root user (administrator) on Linux. While it is possible to work around this issue by passing --no-sandbox flag when creating your WebDriver session, such a configuration is unsupported and highly discouraged. You need to configure your environment to run Chrome as a regular user instead.
This error message...
org.openqa.selenium.WebDriverException: unknown error: DevToolsActivePort file doesn't exist
...implies that the ChromeDriver was unable to initiate/spawn a new WebBrowser i.e. Chrome Browser session.
Your code trials and the versioning information of all the binaries would have given us some hint about what's going wrong.
However as per Add --disable-dev-shm-usage to default launch flags seems adding the argument --disable-dev-shm-usage will temporary solve the issue.
If you desire to initiate/span a new Chrome Browser session you can use the following solution:
System.setProperty("webdriver.chrome.driver", "C:\\path\\to\\chromedriver.exe");
ChromeOptions options = new ChromeOptions();
options.addArguments("start-maximized"); // open Browser in maximized mode
options.addArguments("disable-infobars"); // disabling infobars
options.addArguments("--disable-extensions"); // disabling extensions
options.addArguments("--disable-gpu"); // applicable to windows os only
options.addArguments("--disable-dev-shm-usage"); // overcome limited resource problems
options.addArguments("--no-sandbox"); // Bypass OS security model
WebDriver driver = new ChromeDriver(options);
driver.get("https://google.com");
disable-dev-shm-usage
As per base_switches.cc disable-dev-shm-usage seems to be valid only on Linux OS:
#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
// The /dev/shm partition is too small in certain VM environments, causing
// Chrome to fail or crash (see http://crbug.com/715363). Use this flag to
// work-around this issue (a temporary directory will always be used to create
// anonymous shared memory files).
const char kDisableDevShmUsage[] = "disable-dev-shm-usage";
#endif
In the discussion Add an option to use /tmp instead of /dev/shm David mentions:
I think it would depend on how are /dev/shm and /tmp mounted.
If they are both mounted as tmpfs I'm assuming there won't be any difference.
if for some reason /tmp is not mapped as tmpfs (and I think is mapped as tmpfs by default by systemd), chrome shared memory management always maps files into memory when creating an anonymous shared files, so even in that case shouldn't be much difference. I guess you could force telemetry tests with the flag enabled and see how it goes.
As for why not use by default, it was a pushed back by the shared memory team, I guess it makes sense it should be useing /dev/shm for shared memory by default.
Ultimately all this should be moving to use memfd_create, but I don't think that's going to happen any time soon, since it will require refactoring Chrome memory management significantly.
Reference
You can find a couple of detailed discussions in:
unknown error: DevToolsActivePort file doesn't exist error while executing Selenium UI test cases on ubuntu
Tests fail immediately with unknown error: DevToolsActivePort file doesn't exist when running Selenium grid through systemd
Outro
Here is the link to the Sandbox story.
I started seeing this problem on Monday 2018-06-04. Our tests run each weekday. It appears that the only thing that changed was the google-chrome version (which had been updated to current) JVM and Selenium were recent versions on Linux box ( Java 1.8.0_151, selenium 3.12.0, google-chrome 67.0.3396.62, and xvfb-run).
Specifically adding the arguments "--no-sandbox" and "--disable-dev-shm-usage" stopped the error.
I'll look into these issues to find more info about the effect, and other questions as in what triggered google-chrome to update.
ChromeOptions options = new ChromeOptions();
...
options.addArguments("--no-sandbox");
options.addArguments("--disable-dev-shm-usage");
We were having the same issues on our jenkins slaves (linux machine) and tried all the options above.
The only thing helped is setting the argument
chrome_options.add_argument('--headless')
But when we investigated further, noticed that XVFB screen doesn't started property and thats causing this error. After we fix XVFB screen, it resolved the issue.
I had the same problem in python. The above helped. Here is what I used in python -
chrome_options = Options()
chrome_options.add_argument('--headless')
chrome_options.add_argument('--no-sandbox')
chrome_options.add_argument('--disable-dev-shm-usage')
driver = webdriver.Chrome('/path/to/your_chrome_driver_dir/chromedriver',chrome_options=chrome_options)
I was facing the same issue recently and after some trial and error it worked for me as well.
MUST BE ON TOP:
options.addArguments("--no-sandbox"); //has to be the very first option
BaseSeleniumTests.java
public abstract class BaseSeleniumTests {
private static final String CHROMEDRIVER_EXE = "chromedriver.exe";
private static final String IEDRIVER_EXE = "IEDriverServer.exe";
private static final String FFDRIVER_EXE = "geckodriver.exe";
protected WebDriver driver;
#Before
public void setUp() {
loadChromeDriver();
}
#After
public void tearDown() {
if (driver != null) {
driver.close();
driver.quit();
}
}
private void loadChromeDriver() {
ClassLoader classLoader = getClass().getClassLoader();
String filePath = classLoader.getResource(CHROMEDRIVER_EXE).getFile();
DesiredCapabilities capabilities = DesiredCapabilities.chrome();
ChromeDriverService service = new ChromeDriverService.Builder()
.usingDriverExecutable(new File(filePath))
.build();
ChromeOptions options = new ChromeOptions();
options.addArguments("--no-sandbox"); // Bypass OS security model, MUST BE THE VERY FIRST OPTION
options.addArguments("--headless");
options.setExperimentalOption("useAutomationExtension", false);
options.addArguments("start-maximized"); // open Browser in maximized mode
options.addArguments("disable-infobars"); // disabling infobars
options.addArguments("--disable-extensions"); // disabling extensions
options.addArguments("--disable-gpu"); // applicable to windows os only
options.addArguments("--disable-dev-shm-usage"); // overcome limited resource problems
options.merge(capabilities);
this.driver = new ChromeDriver(service, options);
}
}
GoogleSearchPageTraditionalSeleniumTests.java
#RunWith(SpringRunner.class)
#SpringBootTest
public class GoogleSearchPageTraditionalSeleniumTests extends BaseSeleniumTests {
#Test
public void getSearchPage() {
this.driver.get("https://www.google.com");
WebElement element = this.driver.findElement(By.name("q"));
assertNotNull(element);
}
}
pom.xml
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-java</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
In my case in the following environment:
Windows 10
Python 3.7.5
Google Chrome version 80 and corresponding ChromeDriver in the path C:\Windows
selenium 3.141.0
I needed to add the arguments --no-sandbox and --remote-debugging-port=9222 to the ChromeOptions object and run the code as administrator user by lunching the Powershell/cmd as administrator.
Here is the related piece of code:
options = webdriver.ChromeOptions()
options.add_argument('headless')
options.add_argument('--disable-infobars')
options.add_argument('--disable-dev-shm-usage')
options.add_argument('--no-sandbox')
options.add_argument('--remote-debugging-port=9222')
driver = webdriver.Chrome(options=options)
I ran into this problem on Ubuntu 20 with Python Selenium after first downloading the chromedriver separately and then using sudo apt install chromium-browser Even though they were the same version this kept happening.
My fix was to use the provided chrome driver that came with the repo package located at
/snap/bin/chromium.chromedriver
driver = webdriver.Chrome(chrome_options=options, executable_path='/snap/bin/chromium.chromedriver')
Update:
I am able to get through the issue and now I am able to access the chrome with desired url.
Results of trying the provided solutions:
I tried all the settings as provided above but I was unable to resolve the issue
Explanation regarding the issue:
As per my observation DevToolsActivePort file doesn't exist is caused when chrome is unable to find its reference in scoped_dirXXXXX folder.
Steps taken to solve the issue
I have killed all the chrome processes and chrome driver processes.
Added the below code to invoke the chrome
System.setProperty("webdriver.chrome.driver","pathto\\chromedriver.exe");
ChromeOptions options = new ChromeOptions();
options.setExperimentalOption("useAutomationExtension", false);
WebDriver driver = new ChromeDriver(options);
driver.get(url);
Using the above steps I was able to resolve the issue.
Thanks for your answers.
In my case it was problem with CI Agent account on ubuntu server, I solved this using custom --user-data-dir
chrome_options.add_argument('--user-data-dir=~/.config/google-chrome')
My account used by CI Agent didn't have necessary permissions, what was interesting everything was working on root account
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
chrome_options = Options()
chrome_options.add_argument('--no-sandbox')
chrome_options.add_argument('--headless')
chrome_options.add_argument('--disable-gpu')
chrome_options.add_argument('--disable-dev-shm-usage')
chrome_options.add_argument('--profile-directory=Default')
chrome_options.add_argument('--user-data-dir=~/.config/google-chrome')
driver = webdriver.Chrome(options=chrome_options)
url = 'https://www.google.com'
driver.get(url)
get_url = driver.current_url
print(get_url)
There is lot of possible reasons for the RESPONSE InitSession ERROR unknown error: DevToolsActivePort file doesn't exist error message (as we can see from the number of answers for this question). So let's dive deeper to explain what exactly this error message means.
According to chromedriver source code the message is created in ParseDevToolsActivePortFile method. This method is called from the loop after launching chrome process.
In the loop the driver check if the chrome process is still running and if the ParseDevToolsActivePortFile file was already created by chrome. There is a hardcoded 60s timeout for this loop.
I see two possible reasons for this message:
Chrome is really slow during startup - for example due to lack of system resources - mainly CPU or memory. In this case it can happen that sometimes chrome manage to start in time limit and sometimes not.
There is another issue which prevents chrome to start - missing or broken dependency, wrong configuration etc. In such case this error message is not really helpful and you should find another log message which explain the true reason of the failure.
It happens when chromedriver fails to figure out what debugging port chrome is using.
One possible cause is an open defect with HKEY_CURRENT_USER\Software\Policies\Google\Chrome\UserDataDir
But in my last case, it was some other unidentified cause.
Fortunately setting port number manually worked:
final String[] args = { "--remote-debugging-port=9222" };
options.addArguments(args);
WebDriver driver = new ChromeDriver(options);
As stated in this other answer:
This error message... implies that the ChromeDriver was unable to initiate/spawn a new WebBrowser i.e. Chrome Browser session.
Among the possible causes, I would like to mention the fact that, in case you are running an headless Chromium via Xvfb, you might need to export the DISPLAY variable: in my case, I had in place (as recommended) the --disable-dev-shm-usage and --no-sandbox options, everything was running fine, but in a new installation running the latest (at the time of writing) Ubuntu 18.04 this error started to occurr, and the only possible fix was to execute an export DISPLAY=":20" (having previously started Xvfb with Xvfb :20&).
You can get this error simply for passing bad arguments to Chrome. For example, if I pass "headless" as an arg to the C# ChromeDriver, it fires up great. If I make a mistake and use the wrong syntax, "--headless", I get the DevToolsActivePort file doesn't exist error.
I was stuck on this for a very long time and finally fixed it by adding this an additional option:
options.addArguments("--crash-dumps-dir=/tmp")
I know it's an old question and it already has a lot of answers. However, I ran into this issue, bumped into this thread and none of the proposed solutions helped. After spending a few days(!) on it I finally found a solution:
My problem was that I was using the selenium/standalone-chrome image on a MacBook with M1 chip. After switching to seleniarm/standalone-chromium everything finally started to work.
I had the same issue, but in my case chrome previously was installed in user temp folder, after that was reinstalled to Program files. So any of solution provided here was not help me. But if provide path to chrome.exe all works:
chromeOptions.setBinary("C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe");
I hope this helps someone =)
In my case it happened when I've tried to use my default user profile:
...
options.addArguments("user-data-dir=D:\\MyHomeDirectory\\Google\\Chrome\\User Data");
...
This triggered chrome to reuse processes already running in background, in such a way, that process started by chromedriver.exe was simply ended.
Resolution: kill all chrome.exe processes running in background.
update capabilities in conf.js as
exports.config = {
seleniumAddress: 'http://localhost:4444/wd/hub',
specs: ['todo-spec.js'],
capabilities: {
browserName: 'chrome',
chromeOptions: {
args: ['--disable-gpu', '--no-sandbox', '--disable-extensions', '--disable-dev-shm-usage']
}
},
};
Old question but a similar issue nearly drove me to insanity so sharing my solution. None of the other suggestions fixed my issue.
When I updated my Docker image Chrome installation from an old version to Chrome 86, I got this error. My setup was not identical but we were instantiating Chrome through a selenium webdriver.
The solution was to pass the options as goog:chromeOptions hash instead of chromeOptions hash. I truly don't know if this was a Selenium, Chrome, Chromedriver, or some other update, but maybe some poor soul will find solace in this answer in the future.
For Ubuntu 20 it did help me to use my systems chromium driver instead of the downloaded one:
# chromium which
/snap/bin/chromium
driver = webdriver.Chrome('/snap/bin/chromium.chromedriver',
options=chrome_options)
And for the downloaded webdriver looks like it needs the remote debug port --remote-debugging-port=9222 to be set, as in one of the answers (by Soheil Pourbafrani):
chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument("--remote-debugging-port=9222")
driver = webdriver.Chrome('<path_to>/chromedriver', options=chrome_options)
Date 9/16/2021
Everything works fine running chrome with selenium locally with python inside the docker hosted ubuntu container. When attempting to run from Jenkins the error above is returned WebDriverException: unknown error: DevToolsActivePort
Environment:
-Ubuntu21.04 inside a docker container with RDP access.
-chromedriver for chrome version: 93
Solution:
Inside the python file that starts the browser I had to set the DISPLAY environment variable using the following lines:
import os
os.environ['DISPLAY'] = ':10.0'
#DISPLAY_VAR = os.environ.get('DISPLAY')
#print("DISPLAY_VAR:", DISPLAY_VAR)
In my case, I was trying to create a runnable jar on Windows OS with chrome browser and want to run the same on headless mode in unix box with CentOs on it. And I was pointing my binary to a driver that I have downloaded and packaged with my suite. For me, this issue continue to occur irrespective of adding the below:
ChromeOptions options = new ChromeOptions();
options.addArguments("--headless");
options.addArguments("--no-sandbox");
System.setProperty("webdriver.chrome.args", "--disable-logging");
System.setProperty("webdriver.chrome.silentOutput", "true");
options.setBinary("/pointing/downloaded/driver/path/in/automationsuite");
options.addArguments("--disable-dev-shm-usage"); // overcome limited resource problems
options.addArguments("disable-infobars"); // disabling infobars
options.addArguments("--disable-extensions"); // disabling extensions
options.addArguments("--disable-gpu"); // applicable to windows os only
options.addArguments("--disable-dev-shm-usage"); // overcome limited resource problems
options.addArguments("window-size=1024,768"); // Bypass OS security model
options.addArguments("--log-level=3"); // set log level
options.addArguments("--silent");//
options.setCapability("chrome.verbose", false); //disable logging
driver = new ChromeDriver(options);
Solution that I've tried and worked for me is, download the chrome and its tools on the host VM/Unix box, install and point the binary to this in the automation suite and bingo! It works :)
Download command:
wget https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm
Install command:
sudo yum install -y ./google-chrome-stable_current_*.rpm
Update suite with below binary path of google-chrome:
options.setBinary("/opt/google/chrome/google-chrome");
And.. it works!
I also faced this issue while integrating with jenkins server, I was used the root user for jenkin job, the issue was fixed when I changed the user to other user. I am not sure why this error occurs for the root user.
Google Chrome Version 71.0
ChromeDriver Version 2.45
CentOS7 Version 1.153
I run selenium tests with Jenkins running on an Ubuntu 18 LTS linux. I had this error until I added the argument 'headless' like this (and some other arguments):
ChromeOptions options = new ChromeOptions();
options.addArguments("headless"); // headless -> no browser window. needed for jenkins
options.addArguments("disable-infobars"); // disabling infobars
options.addArguments("--disable-extensions"); // disabling extensions
options.addArguments("--disable-dev-shm-usage"); // overcome limited resource problems
options.addArguments("--no-sandbox"); // Bypass OS security model
ChromeDriver driver = new ChromeDriver(options);
driver.get("www.google.com");
Had the same issue. I am running the selenium script on Google cloud VM.
options.addArguments("--headless");
The above line resolved my issue. I removed the other optional arguments. I think the rest lines of code mentioned in other answers did not have any effect on resolving the issue on the cloud VM.
in my case, when i changed the google-chrome and chromedriver version, the error was fixed :)
#google-chrome version
[root#localhost ~]# /usr/bin/google-chrome --version
Google Chrome 83.0.4103.106
#chromedriver version
[root#localhost ~]# /usr/local/bin/chromedriver -v
ChromeDriver 83.0.4103.14 (be04594a2b8411758b860104bc0a1033417178be-refs/branch-heads/4103#{#119})
ps: selenium verison was 3.9.1
No solution worked for my. But here is a workaround:
maxcounter=5
for counter in range(maxcounter):
try:
driver = webdriver.Chrome(chrome_options=options,
service_log_path=logfile,
service_args=["--verbose", "--log-path=%s" % logfile])
break
except WebDriverException as e:
print("RETRYING INITIALIZATION OF WEBDRIVER! Error: %s" % str(e))
time.sleep(10)
if counter==maxcounter-1:
raise WebDriverException("Maximum number of selenium-firefox-webdriver-retries exceeded.")
It seems there are many possible causes for this error. In our case, the error happened because we had the following two lines in code:
System.setProperty("webdriver.chrome.driver", chromeDriverPath);
chromeOptions.setBinary(chromeDriverPath);
It's solved by removing the second line.
I ran into same issue, i am using UBUNTU, PYTHON and OPERA browser. in my case the problem was originated because i had an outdated version of operadriver.
Solution:
1. Make sure you install latest opera browser version ( do not use opera beta or opera developer), for that go to the official opera site and download from there the latest opera_stable version.
Install latest opera driver (if you already have an opera driver install, you have to remove it first use sudo rm ...)
wget https://github.com/operasoftware/operachromiumdriver/releases/download/v.80.0.3987.100/operadriver_linux64.zip
unzip operadriver_linux64.zip
sudo mv operadriver /usr/bin/operadriver
sudo chown root:root /usr/bin/operadriver
sudo chmod +x /usr/bin/operadriver
in my case latest was 80.0.3987 as you can see
Additionally i also installed chromedriver (but since i did it before testing, i do not know of this is needed) in order to install chromedriver, follow the steps on previous step :v
Enjoy and thank me!
Sample selenium code
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
driver = webdriver.Opera()
driver.get("http://www.python.org")
assert "Python" in driver.title
elem = driver.find_element_by_name("q")
elem.clear()
elem.send_keys("pycon")
elem.send_keys(Keys.RETURN)
assert "No results found." not in driver.page_source
driver.quit()
I came across the same problem, in my case there are two different common user userA and userB in Linux system.
userA first run the selinium programe which start chrome browswer with ChromeDriver successfully, when it came to userB, the DevToolsActivePort file doesn't exist error occur.
I tried the --remote-debugging-port=9222 option, but it lead to a new exception:
selenium.common.exceptions.WebDriverException: Message: chrome not reachable
The I ran google-chome directory and see the following error:
mkdir /tmp/Crashpad/new: Permission denied (13)
The I search the problem and got this:
https://johncylee.github.io/2022/05/14/chrome-headless-%E6%A8%A1%E5%BC%8F%E4%B8%8B-devtoolsactiveport-file-doesn-t-exist-%E5%95%8F%E9%A1%8C/
chrome_options.add_argument(f"--crash-dumps-dir={os.path.expanduser('~/tmp/Crashpad')}")
Thanks to #johncylee.

I'm trying to start the chrome webdriver on linux, but it hangs, then closes

I'm making a program with selenium (python). It was working, and out of nowhere, the webdriver no longer works. I'm developing on a windows environment (and it works fine), but once I upload the code to the production server (Ubuntu), I try to open the web driver and it only displays data;, the driver hangs, then closes. No code after that continues.
Example:
print("Starting web driver")
driver = webdriver.Chrome(driver_path, options=opt)
print("Opening URL") # This code doesn't run
driver.get(config.url) # This code doesn't run
Things I've tried:
Running it on Windows (it works properly)
Updating the webdriver
Running it outside of the venv
Running the driver in a new, isolated environment
Wrapping the entire code within try-except (no errors output)
Running with the argument --headless
Edit: I'm running python3.7, chrome webdriver V 75.0.3770.90
Edit2: the driver_path var is the relative path to the chromedriver file. The opt are my list of chrome options:
opt = Options()
opt.add_argument('--no-sandbox')
opt.add_argument('--disable-dev-shm-usage')
profile = {"plugins.always_open_pdf_externally": True,
"download.default_directory": download_directory,
"download.prompt_for_download": False,
"download.directory_upgrade": True}
opt.add_experimental_option("prefs", profile)
I'm also using gunicorn as my webserver, but running it with the default (flask) webserver, I still encounter the issue. I'm also executing functions I've written for selenium through a flask-based web application (its a web app for work) The ubuntu machine that's running the script has a desktop environment installed.
After 15-25 seconds, the windows closes with no output in the terminal. After ~90 seconds, I get a message in the terminal saying:
Message: session not created
from disconnected: unable to connect to renderer
(Session info: chrome=75.0.3770.90)
I've also noticed that the chrome driver takes more time to open than usual.
Edit3: I've literally deleted then entire virtual machine and reinstalled it from scratch, and I'm still running into the same issue, I've reverted to an older version and it still doesn't run, which makes no logical sense. My only thought is that there is some configuration error or that something is interfering with it.
Edit4: I was able to get the log from the webdriver by adding the argument --verbose
Heres the log:
[1562179109.454][INFO]: resolved localhost to ["::1","127.0.0.1"]
[1562179111.454][WARNING]: Timed out connecting to Chrome, retrying...
[1562179111.454][INFO]: resolved localhost to ["::1","127.0.0.1"]
[1562179115.454][WARNING]: Timed out connecting to Chrome, retrying...
[1562179115.455][INFO]: resolved localhost to ["::1","127.0.0.1"]
[1562179123.454][WARNING]: Timed out connecting to Chrome, retrying...
[1562179123.455][INFO]: resolved localhost to ["::1","127.0.0.1"]
[1562179139.455][WARNING]: Timed out connecting to Chrome, giving up.
[1562179139.506][INFO]: [42e538ee02eb06b9ac776969dddf01d1] RESPONSE InitSession ERROR session not created
from disconnected: unable to connect to renderer
(Session info: chrome=75.0.3770.90)
[1562179139.506][DEBUG]: Log type 'driver' lost 9 entries on destruction
[1562179139.506][DEBUG]: Log type 'browser' lost 0 entries on destruction
I'm not too familiar with Linux, but from what I've seen in the past, I have a feeling its something to do with /etc/hosts (idk?)
Edit5:
I've noticed this started happening after I installed windscribe (vpn) which makes me think that windscribe is interfering with the connection somehow.
I turns out, windscribe (vpn) interferes with the connection to the chrome webdriver, I believe it has something to do with its built-in firewall, after uninstalling it, calling sudo apt autoremove -y and a reboot, it works properly!
Edit: I re-installed the VPN (windscribe) and de-activated the included firewall and it worked properly after that.

webdriver in selenium opens a new Internet Explorer tab in FireFox

from selenium import webdriver
browser = webdriver.Firefox()
browser.get('http://www.google.com')
Can someone help me with the above code. I expect this code to open a new tab in Firefox with google.com; instead this opens a new Internet Explorer tab.
Setting up geckodriver for Selenium Python resolves the issue I think.
It needs to set geckodriver path with FirefoxDriver as below code:
self.driver = webdriver.Firefox(executable_path = 'PATH\TO\geckodriver.exe')
Download geckodriver for your suitable OS from https://github.com/mozilla/geckodriver/releases
Extract it in a folder of your choice
Set the path correctly as mentioned above
IEDriverServer and GeckoDriver both of the WebDriver variants being/getting W3C Compliant and evolving with each day, it is quite possible that trying to use one of the variants gets hooked to other variant of Web Browser because of the following reasons :
Your Automated Tests may be running in an environment which is Manually Intervened by opening/closing of Internet Explorer and Firefox Web Browsers.
You have a (couple of) dangling instance of IEDriverServer within your system which needs to be cleaned up.
Solution :
Here are a few possible solutions for the issue you are facing :
Always be explicit mentioning the absolute location of the GeckoDriver while initializing the WebDriver / Web Browser instance as follows :
driver=webdriver.Firefox(executable_path=r'C:\path\to\geckodriver.exe')
Within the tearDown() method of your Test Execution always use quit() as follows :
driver.quit()
Before you start the Test Execution ensure there are no dangling instances of any WebDriver variant.
Incase your Test Framework leaves any dangling instances add the following Windows Based Command at the end of your script to kill the dangling WebDriver.
taskkill /F /IM <webdriver_variant>.exe /T
Periodically Cleanup your Project WorkSpace in your IDE.
Run CCleaner tool to wipe away all the OS chores before and after Test Execution.
When you uninstall any Browser (any Software) from your system use Revo Uninstaller which cleans up your Unused Registry Settings as well.

Run a scheduled task with ChromeDriver

I have made a script based on Selenium and Chromedriver. Basically a program that login into a site. Writes a comment (From a txt file from computer) and then closes the program and no it is not a spam script but a script I have made just to begin with python and selenium.
The program itself works very well if I start it manually. Then there is no issue and chromedriver is headless since I don't need to see the whole process chrome_options.add_argument("--headless")
Then I saw a post from here Scheduling a Python Script
and I did follow it
but the issue im having is that everytime it is the time and the program starts. It comes up the script and then a fast error which I managed to print
Which I can see there is a issue with the Chromedriver. The thing is now. How can I make this script to work through schedule tasks with Chromedriver running on the background. I might have done the setup wrong but the program works manually so I guess there might be a issue with Windows schedule tasks?
Basically I just want the script to run on the background every xx:xx time.
Please feel free to comment if needed something more information.
chrome_options = Options()
chrome_options.add_argument("--disable-extensions")
chrome_options.add_argument('--disable-notifications')
chrome_options.add_argument("--headless")
chrome_options.add_argument("--user-agent=Mozilla/5.0 (Linux; Android 6.0; HTC One M9 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.98 Mobile Safari/537.36")
driver = webdriver.Chrome(chrome_options=chrome_options)
driver.implicitly_wait(5)
The driver you are using is too old and does not recognize ChromeHeadless, you need to use version 2.29 or newer:
Selenium ChromeDriver does not recognize newly compiled Headless Chromium (Python)
I had the same issue (with a newer "headless" version) and the solution was to run the Windows Scheduled Task as "Administrators" (with "s").
I had this problem and almost give up from task scheduler and started to write windows service which would run my web scraping application. If you got exception chrome unreachable or chrome didn't get response from HTTP server...
This make my application work even through task scheduler.
Task Scheduler -> Go on task -> Properties -> Conditions > Under Network -> Check Network Start only if the following network connection is available -> Select "Any connection".
Go this from this post windows-10-task-scheduler-not-running
When using selenium with Chrome, you have to make sure that your selenium version is compatible with the chrome version you have installed. If you get the app to work and then update your chrome you might get an unrecognized version error.
If you have chrome v 102.0 like me, you need to get the latest selenium chrome driver that is the same version as your browser.
See Example Below:
Chrome Driver Download: https://chromedriver.chromium.org/downloads

Cannot create browser process when using selenium from python on RHEL5

I'm trying to use selenium from python but I'm having a problem running it on a RHEL5.5 server. I don't seem to be able to really start firefox.
from selenium import webdriver
b = webdriver.Firefox()
On my laptop with ubuntu this works fine and it starts a brings up a firefox window. When I log in to the server with ssh I can run firefox from the command line and get it displayed on my laptop. It is clearly firefox from the server since it has the RHEL5.5 home page.
When I run the python script above on the server it (or run it in ipython) the script hangs at webdriver.Firefox()
I have also tried
from selenium import webdriver
fb = webdriver.FirefoxProfile()
fb.native_events_enabled=True
b=webdriver.Firefox(fb)
Which also hangs on the final line there.
I'm using python2.7 installed in /opt/python2.7. In installed selenium with /opt/python2.7/pip-2.7.
I can see the firefox process on the server with top and it is using a lot of CPU. I can also see from /proc/#/environ that the DISPLAY is set to localhost:10.0 which seems right.
How can I get a browser started with selenium on RHEL5.5? How can I figure out why Firefox is not starting?
It looks like the problem I'm encountering is this selenium bug:
http://code.google.com/p/selenium/issues/detail?id=2852
I used the fix described in comment #9 http://code.google.com/p/selenium/issues/detail?id=2852#c9
That worked for me.

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