Appium with Selenium 4 grid deploied on kubernetes

[Mário Pereira]

Hello comm!

Merry Christmas!

I have a couple of devices that I used to connect to selenium grid 3 with Appium as middleware.

Recently we updated Selenium 3 to Selenium 4 and deployed the grid on a kubernetes cluster.

From what we could see we need to have a relay node to bridge the webdriver communication but I don't see how can we configure the on K8S helm chart https://artifacthub.io/packages/helm/blackfire/selenium.

Can you please advice us?

Thanks

[Vinayak S Kori]

Hi,

In Selenium 4, the concept of a "relay node" has been replaced with the concept of a "relay server". The relay server acts as a bridge between the client (such as Appium) and the actual webdriver (such as Chrome or Firefox).

To configure a relay server in a Selenium grid deployed on Kubernetes using the Helm chart, you can follow these steps:

1. First, you need to install the Helm chart for the Selenium grid. You can do this by running the helm install command and specifying the chart repository and chart name.

2. Next, you need to modify the values.yaml file to include the configuration for the relay server. You can do this by adding the following block to the file:

relay:
  enabled: true
  host: "0.0.0.0"
  port: 4444
  path: /wd/hub

3. In the above configuration, the host and port values specify the address and port that the relay server will listen on. The path value specifies the URL path that the relay server will use to handle webdriver requests.

4. Once you have modified the values.yaml file, you can use the helm upgrade command to apply the changes to your Selenium grid deployment.

5. To connect to the Selenium grid using the relay server, you can use the http://<relay-server-address>:<relay-server-port>/wd/hub URL as the remote webdriver endpoint. For example:

from selenium import webdriver

driver = webdriver.Remote(
    command_executor='http://<relay-server-address>:<relay-server-port>/wd/hub',
    desired_capabilities={'browserName': 'chrome'}
)

I Hope this helps you.

Regards,

Vinayak S Kori

QA Analyst

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[Mário Pereira]

Hey Vinayak S Kori, 

Thanks for reaching out!

I tried it and failed :D I just checked the Helm chart values file here and I didn't find the "relay" values.

Are we using the correct helm chart, do we have another one that has that relay values?

Thanks in advance,

Cheers,

Mário