Setting up a Selenium node on Linux

Question

I am currently trying to set up a Selenium node on a Linux VM (headless). The hub is being run from a Windows device on port 5786 (4444 was in use).

I initiate the hub using the following code:

java -jar selenium-server-standalone-
2.53.0.jar -role node –hub http://<myIP>:5786/grid/register -port 5558

When i execute this, it returns the following error messages:

13:42:12.765 INFO - Launching a Selenium Grid node
13:42:13.435 WARN - error getting the parameters from the hub. The node may 
end up with wrong timeouts.Connect to 10.146.48.80:4444 [/10.146.48.80] 
failed: Connection refused
13:42:13.445 INFO - Java: Oracle Corporation 24.60-b09
13:42:13.445 INFO - OS: Linux 3.10.0-514.21.1.el7.x86_64 amd64
13:42:13.450 INFO - v2.53.0, with Core v2.53.0. Built from revision 35ae25b
13:42:13.521 INFO - Driver provider 
org.openqa.selenium.ie.InternetExplorerDriver registration is skipped:
registration capabilities Capabilities [{platform=WINDOWS, 
ensureCleanSession=true, browserName=internet explorer, version=}] does not 
match the current platform LINUX
13:42:13.521 INFO - Driver provider org.openqa.selenium.edge.EdgeDriver 
registration is skipped:
registration capabilities Capabilities [{platform=WINDOWS, 
browserName=MicrosoftEdge, version=}] does not match the current platform 
LINUX
13:42:13.521 INFO - Driver class not found: 
com.opera.core.systems.OperaDriver
13:42:13.521 INFO - Driver provider com.opera.core.systems.OperaDriver is not 
registered
13:42:13.522 INFO - Driver provider org.openqa.selenium.safari.SafariDriver 
registration is skipped:
registration capabilities Capabilities [{platform=MAC, browserName=safari, 
version=}] does not match the current platform LINUX
13:42:13.523 INFO - Driver class not found: 
org.openqa.selenium.htmlunit.HtmlUnitDriver
13:42:13.523 INFO - Driver provider 
org.openqa.selenium.htmlunit.HtmlUnitDriver is not registered
13:42:13.552 INFO - Version Jetty/5.1.x
13:42:13.553 INFO - Started HttpContext[/selenium-server/driver,/selenium-
server/driver]
 13:42:13.553 INFO - Started HttpContext[/selenium-server,/selenium-server]
13:42:13.553 INFO - Started HttpContext[/,/]
13:44:03.596 INFO - Started 
org.openqa.jetty.jetty.servlet.ServletHandler@188fd321
13:44:03.596 INFO - Started HttpContext[/wd,/wd]
13:44:03.599 INFO - Started SocketListener on 0.0.0.0:5555
13:44:03.599 INFO - Started org.openqa.jetty.jetty.Server@a01330f
13:44:03.599 INFO - Selenium Grid node is up and ready to register to the hub
13:44:03.630 INFO - Starting auto registration thread. Will try to register 
every 5000 ms.
13:44:03.630 INFO - Registering the node to the hub: 
http://10.146.48.80:4444/grid/register
13:44:03.638 INFO - Couldn't register this node: Error sending the 
registration request: Connect to 10.146.48.80:4444 [/10.146.48.80] failed: 
Connection refused

score 1 · Accepted Answer · answered Jul 08 '17 at 09:08

In the command that you shared viz.,

java -jar selenium-server-standalone-2.53.0.jar -role node –hub http://<myIP>:5786/grid/register -port 5558

You have a copy paste problem. The - before the parameter hub doesn't seem to be a hyphen character.

I was able to deduce this as a possible root cause because the value of -hub is completely being ignored and the default hub port of 4444 is being attempted to use. The stacktrace that you shared re-iterates this

13:42:13.435 WARN - error getting the parameters from the hub. The node may end up with wrong timeouts.Connect to 10.146.48.80:4444 [/10.146.48.80] failed: Connection refused

As you can see, even though you are providing your Hub's registration URL to include a port number of 5786, its still picking up 4444 and complaining Connection refused.

Please try typing out the entire command for starting the hub and try again. That should work.

Setting up a Selenium node on Linux

1 Answers1