SeleniumGrid: Unable to connect nodes to a hub that is only accessible via a hostname

[timothyjmtan]

🐛 Bug Report

I have a Selenium Hub hosted on Openshift and exposed via a route, meaning that it is accessible via a hostname.

When I attempt to launch and register a node on a different machine, I find that I am unable to register the nodes successfully if we define the hostname instead of an <ip>:<port> in the nodeConfig.json.

It seems like the selenium-standalone-server-3.141.59.jar file requires a direct connection of ip_address:4444 and cannot support hostname as a value.

The stacktrace:

Registering the node to the hub: http://myhostname:-1/grid/register
Couldn't register this node: Error sending the registration request: Unable to parse URL: http://myhostname:-1/grid/registerhttp://myhostname:-1/grid/register
Couldn't register this node: The hub is down or not responding: Unable to parse URL: http://myhostname:-1/grid/registerhttp://myhostname:-1/grid/api/proxyhttp://myhostname:-1/grid/registerhttp://myhostname:-1/grid/api/proxy?http://<some ip address>:80

I am using the node config defined here:
https://github.com/SeleniumHQ/selenium/blob/selenium-3.141.59/java/server/src/org/openqa/grid/common/defaults/DefaultNodeWebDriver.json

To Reproduce

Detailed steps to reproduce the behavior:
Step 1: Launch a Selenium Hub on Openshift, and expose this via a Route
Step 2: Launch a Selenium node on VDI
Step 3: In the nodeConfig.json file, define the "hub" to use the DNS instead of a port, with the syntax as http://myhostname

Expected behavior

The nodes should successfully connect to the hub even if hostname instead of an ip address is defined

Test script or set of commands reproducing this issue

I am using the nodeConfig defined here, and replacing the value of hub with my hostname (without port):
https://github.com/SeleniumHQ/selenium/blob/selenium-3.141.59/java/server/src/org/openqa/grid/common/defaults/DefaultNodeWebDriver.json

Environment

OS: Openshift (Hub) / Windows 10 (Node)
Browser: Google Chrome
Browser version: Version 80
Browser Driver version: 80.0.3987.106
Language Bindings version: OpenJDK11
Selenium Grid version (if applicable): 3.141.59

[diemol]

@timothyjmtan could you please show us the actual json files used to configure the hub and node? Also the commands to start them.

[timothyjmtan]

@diemol Here it is:

{
    "capabilities":
    [
        {
             "browserName": "chrome",
             "maxInstances": 1,
             "seleniumProtocol": "WebDriver",
             "platform": "WINDOWS",
             "version": "81.0"
         }
    ],
    "proxy": "org.openqa.selenium.proxy.DefaultRemoteProxy",
    "maxSession": 1,
    "port": -1,
    "register": true,
    "registerCycle": 5000,
    "hub": "http://my-selenium-hub.uat.paas.xxx.com",
    "nodeStatusCheckTimeout": 60000,
    "nodePolling": 5000,
    "role": "node",
    "unregisterIfStillDownAfter": 60000,
    "downPollingLimit": 2,
    "debug": false,
    "servlets": [],
    "withoutServlets": [],
    "custom": {}
}

And the command was java -jar C:\path\to\selenium-server-standalone-3.141.59.jar -role node -nodeConfig nodeConfig.json

[diemol]

@timothyjmtan why are you using "port": -1? That is probably the cause of the error.

[timothyjmtan]

@diemol I can see why that might cause an issue, however, what should I put for the port then, since the hostname already fully defines the address of the hub, and there is no port number?

[diemol]

You can try the default HTTP port, 80.

[diemol]

Closing as we did not get more info from the OP