unknown error: DevToolsActivePort file doesn't exist error while executing Selenium UI test cases on ubuntu

Question

I have an ubuntu server having the UI as well. U can execute the test cases by firing mvn test command. But the problem is when I do ssh of the machine through the terminal from another machine I get the following error-

unknown error: DevToolsActivePort file doesn't exist
  (Driver info: chromedriver=2.40.565383 (76257d1ab79276b2d53ee976b2c3e3b9f335cde7),platform=Linux 4.4.0-121-generic x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 60.04 seconds
Build info: version: '3.8.1', revision: '6e95a6684b', time: '2017-12-01T18:33:54.468Z'
System info: host: 'ubuntu-test', ip: 'X.X.X.X', os.name: 'Linux', os.arch: 'amd64', os.version: '4.4.0-121-generic', java.version: '1.8.0_171'
Driver info: driver.version: ChromeDriver

but the same command starts chrome successfully if I take remote of the machine through remmina and then execute the same command of this machines terminal.

Answer 1

I use this configuration using python

import os
from selenium import webdriver 
from selenium.webdriver.chrome.options import Options 

chrome_options = webdriver.ChromeOptions()
chrome_options.add_argument("no-sandbox")
chrome_options.add_argument("--disable-extensions")
chrome_options.add_argument("--headless")
driver = os.path.join("path/of/driver","chromedriver")

browser = webdriver.Chrome(executable_path=driver,chrome_options=chrome_options)
browser.get("https://www.example.com")
print(browser.title)

Answer 2

I had a similar issue when I was trying to selenium UI test cases in headless mode. This occurred as I did not have a display server. Starting Xvfb worked for me.

sudo yum -y install Xvfb libXfont Xorg

sudo yum -y groupinstall "X Window System" "Desktop" "Fonts" "General Purpose Desktop"

Xvfb :99 -screen 0 1024x768x24 &

export DISPLAY=:1