selenium-python Process unexpectedly closed with status 1

Question

I am using Python 2.7 with selenium 3. I am  using selenium grid for web automation. When I am starting selenium server as hub and registering node with server manually running on terminal works fine.

But when same commands ran in background using python script or shell script I am seeing error "Process unexpectedly closed with status 1"

For registering a node i am using command in background as:

nohup java -jar selenium-server-standalone-3.14.0.jar -role node -hub http://192.168.57.29:5555/grid/register &

I can see process running but automation fails with above error message

Answer 1

Hi paragf! I checked your code.

 Firstly, there seems to a syntax error at:

output = os.system(cmd))

this line should be:

output = os.system(cmd)

But this wouldn't be the cause for error.

I used the following to start the hub and register the node:

Code to start selenium hub on VM:

import os

def start_selenium_hub_on_vm():

   cmd = "java -jar selenium-server-standalone-3.10.0.jar -role hub -port 4444"

   output = os.system(cmd)
   print 'executing command ', cmd
   if output:
      return output
   else:
      return -1

start_selenium_hub_on_vm()

The output when I run this code is as folllows:

On your node, before trying to register it to the hub, make sure you have a config.json file. The config.json file should look something like this:

{
  "capabilities":
  [
    {
      "browserName": "firefox",
      "marionette": true,
      "maxInstances": 5,
      "seleniumProtocol": "WebDriver",
      "version": "62.0" //Your browser version
    }
  ],
  "proxy": "org.openqa.grid.selenium.proxy.DefaultRemoteProxy",
  "maxSession": 5,
  "port": 5555, //Port on which the hub is running
  "register": true,
  "registerCycle": 5000,
  "hub": "http://192.168.111.132:5555", //URL displayed for Node to register when you start the hub
  "nodeStatusCheckTimeout": 5000,
  "nodePolling": 5000,
  "role": "node",
  "unregisterIfStillDownAfter": 60000,
  "downPollingLimit": 2,
  "debug": false,
  "servlets" : [],
  "withoutServlets": [],
  "custom": {}
}

The python script to register node to hub:

import os
def register_node_to_hub():

   cmd = "java -jar selenium-server-standalone-3.10.0.jar -role node -nodeConfig config.json"

   output = os.system(cmd)
   print 'executing command ', cmd
   if output:
      return output
   else:
      return -1

register_node_to_hub()

The output I get: 

The error you are getting is usually got because of incompatible version. The version that successfully worked for me:

Firefox: 62.0

geckodriver-v0.19.1

selenium-server-standalone-3.10.0.jar

Python 2.7.15

Answer 2

Hey paragf! Could you please share the python/shell script you are using?

Comments

for starting selenium hub:

def start_selenium_hub_on_vm():

   cmd = "nohup java -jar /usr/local/bin/selenium-server-standalone-3.14.0.jar -port 5555 -role hub & \n"

   output = os.system(cmd))
   print 'executing command ', cmd
   if output:
      return output
   else:
      return -1

----------------------------

To register selenium server on node 

def register_selenium_node_with_hub(ip, user='admin',passwd ='admin123'):

    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh.connect(ip, username=user, password=passwd)
    command = "nohup java -jar selenium-server-standalone-3.14.0.jar -role node -hub http://192.168.57.29:5555/grid/register &"
    stdin_, stdout_, stderr_ = ssh.exec_command(command)
    lines = stdout_.readlines()
    for line in lines:
        print line
    ssh.close()

---

Hi,

Any update on this?

---

Hey there, I've posted my answer here for this problem. Please check this and let me know if it works for you. And if you've got any other solution, you can post it :-)