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title CLI options in the Selenium Grid
linkTitle CLI Options
weight 2
description All Grid components configuration CLI options in detail.
aliases
/documentation/grid/configuring_components/cli_options/

Different sections are available to configure a Grid. Each section has options can be configured through command line arguments.

A complete description of the component to section mapping can be seen below.

{{% pageinfo color="primary" %}} Note that this documentation could be outdated if an option was modified or added but has not been documented yet. In case you bump into this situation, please check the ["Config help"]({{< ref "help.md" >}}) section and feel free to send us a pull request updating this page. {{% /pageinfo %}}

Sections

Standalone Hub Node Distributor Router Sessions SessionQueue
Distributor
Docker
Kubernetes
Events
Logging
Network
Node
Router
Relay
Server
SessionQueue
Sessions

Distributor

Option Type Value/Example Description
--healthcheck-interval int 120 How often, in seconds, will the health check run for all Nodes. This ensures the server can ping all the Nodes successfully.
--distributor uri http://localhost:5553 Url of the distributor.
--distributor-host string localhost Host on which the distributor is listening.
--distributor-implementation string org.openqa.selenium.grid.distributor.local.LocalDistributor Full class name of non-default distributor implementation
--distributor-port int 5553 Port on which the distributor is listening.
--reject-unsupported-caps boolean false Allow the Distributor to reject a request immediately if the Grid does not support the requested capability. Rejecting requests immediately is suitable for a Grid setup that does not spin up Nodes on demand.
--slot-matcher string org.openqa.selenium.grid.data.DefaultSlotMatcher Full class name of non-default slot matcher to use. This is used to determine whether a Node can support a particular session.
--slot-selector string org.openqa.selenium.grid.distributor.selector.DefaultSlotSelector Full class name of non-default slot selector. This is used to select a slot in a Node once the Node has been matched.
--newsession-threadpool-size int 24 The Distributor uses a fixed-sized thread pool to create new sessions as it consumes new session requests from the queue. This allows configuring the size of the thread pool. The default value is no. of available processors * 3. Note: If the no. of threads is way greater than the available processors it will not always increase the performance. A high number of threads causes more context switching which is an expensive operation.
--purge-nodes-interval int 30 How often, in seconds, will the Distributor purge Nodes that have been down for a while. This is calculated based on the heartbeat received from a particular node.

Docker

Option Type Value/Example Description
--docker-assets-path string /opt/selenium/assets Absolute path where assets will be stored
--docker / -D string[] selenium/standalone-firefox:latest '{"browserName": "firefox"}' Docker configs which map image name to stereotype capabilities (example: -D selenium/standalone-firefox:latest '{"browserName": "firefox"}')
--docker-devices string[] /dev/kvm:/dev/kvm Exposes devices to a container. Each device mapping declaration must have at least the path of the device in both host and container separated by a colon like in this example: /device/path/in/host:/device/path/in/container
--docker-host string localhost Host name where the Docker daemon is running
--docker-port int 2375 Port where the Docker daemon is running
--docker-url string http://localhost:2375 URL for connecting to the Docker daemon
--docker-video-image string selenium/video:latest Docker image to be used when video recording is enabled
--docker-host-config-keys string[] Dns DnsOptions DnsSearch ExtraHosts Binds Specify which docker host configuration keys should be passed to browser containers. Keys name can be found in the Docker API documentation, or by running docker inspect the node-docker container.
--docker-api-version string 1.40 Docker API version to use. Pin a specific API version instead of relying on auto-detection by the implementation.
--docker-server-start-timeout int 55 Max time (in seconds) to wait for the browser server to successfully start up inside the container, before cancelling the process.
--docker-grouping-labels string[] azure.container.group aws.ecs.cluster Custom labels used for grouping dynamic containers. Makes the system more flexible for different platforms and use cases.

Kubernetes

Option Type Value/Example Description
--kubernetes-url string "https://my-k8s-cluster:6443" Kubernetes API server URL. When set, connects to a remote cluster instead of using in-cluster or kubeconfig auto-discovery.
--kubernetes-configs / -K string[] selenium/standalone-firefox:latest '{"browserName": "firefox"}' Kubernetes configs which map image name to stereotype capabilities (example: -K selenium/standalone-firefox:latest '{"browserName": "firefox"}'). Use configmap:[namespace/]<name> as the key to load a Job template from a Kubernetes ConfigMap instead of an image name.
--kubernetes-namespace string "selenium" Kubernetes namespace to create browser Jobs in. Auto-detected from the client when running in-cluster if not set.
--kubernetes-service-account string "selenium-session" Override service account for browser Jobs. Auto-inherited from the Node Pod when running in K8s.
--kubernetes-image-pull-policy string "IfNotPresent" Override image pull policy for browser containers (Always, IfNotPresent, Never). Auto-inherited from the Node Pod when running in K8s.
--kubernetes-server-start-timeout int 120 Max time (in seconds) to wait for the browser server to start up in the K8s Pod.
--kubernetes-termination-grace-period int 30 Seconds to wait for containers to shut down gracefully before force-killing them.
--kubernetes-resource-requests string "cpu=500m,memory=512Mi" Override resource requests for browser containers (comma-separated key=value pairs). Auto-inherited from the Node Pod when running in K8s.
--kubernetes-resource-limits string "cpu=1,memory=1Gi" Override resource limits for browser containers (comma-separated key=value pairs). Auto-inherited from the Node Pod when running in K8s.
--kubernetes-node-selector string "disktype=ssd,region=us-west" Override node selector for scheduling browser Pods (comma-separated key=value pairs). Auto-inherited from the Node Pod when running in K8s.
--kubernetes-video-image string "selenium/video:latest" Container image to use as a video recording sidecar. Set to false to disable video recording (default).
--kubernetes-assets-path string "/opt/selenium/assets" Absolute path where session assets will be stored.
--kubernetes-label-inherit-prefix string "se/" Prefix filter for inheriting labels/annotations from the Node Pod to browser Jobs. Only labels/annotations whose keys start with this prefix are inherited. An empty string inherits all.

Events

Option Type Value/Example Description
--bind-bus boolean false Whether the connection string should be bound or connected.
When true, the component will be bound to the Event Bus (as in the Event Bus will also be started by the component, typically by the Distributor and the Hub).
When false, the component will connect to the Event Bus.
--events-implementation string org.openqa.selenium.events.zeromq.ZeroMqEventBus Full class name of non-default event bus implementation
--publish-events string tcp://*:4442 Connection string for publishing events to the event bus
--subscribe-events string tcp://*:4443 Connection string for subscribing to events from the event bus
--eventbus-heartbeat-period int 30 How often, in seconds, will the EventBus socket send heartbeats.

Logging

Option Type Value/Example Description
--http-logs boolean false Enable http logging. Tracing should be enabled to log http logs.
--log-encoding string UTF-8 Log encoding
--log string Windows path example :
'\path\to\file\gridlog.log'
or
'C:\path\path\to\file\gridlog.log'

Linux/Unix/MacOS path example :
'/path/to/file/gridlog.log'		 File to write out logs. Ensure the file path is compatible with the operating system's file path.
--log-level string “INFO” Log level. Default logging level is INFO. Log levels are described here https://docs.oracle.com/en/java/javase/11/docs/api/java.logging/java/util/logging/Level.html
--plain-logs boolean true Use plain log lines
--structured-logs boolean false Use structured logs
--tracing boolean true Enable trace collection
--log-timestamp-format string HH:mm:ss.SSS Allows the configure log timestamp format

Network

Option Type Value/Example Description
--relax-checks boolean false Relax checks on origin header and content type of incoming requests, in contravention of strict W3C spec compliance.

Node

Option Type Value/Example Description
--detect-drivers boolean true Autodetect which drivers are available on the current system, and add them to the Node.
--driver-configuration string[] display-name="Firefox Nightly" max-sessions=2 webdriver-path="/usr/local/bin/geckodriver" stereotype="{\"browserName\": \"firefox\", \"browserVersion\": \"86\", \"moz:firefoxOptions\": {\"binary\":\"/Applications/Firefox Nightly.app/Contents/MacOS/firefox-bin\"}}" List of configured drivers a Node supports. It is recommended to provide this type of configuration through a toml config file to improve readability
--driver-factory string[] org.openqa.selenium.example.LynxDriverFactory '{"browserName": "lynx"}' Mapping of fully qualified class name to a browser configuration that this matches against.
--driver-implementation string[] "firefox" Drivers that should be checked. If specified, will skip autoconfiguration.
--node-implementation string "org.openqa.selenium.grid.node.local.LocalNodeFactory" Full classname of non-default Node implementation. This is used to manage a session's lifecycle.
--grid-url string https://grid.example.com Public URL of the Grid as a whole (typically the address of the Hub or the Router)
--heartbeat-period int 60 How often, in seconds, will the Node send heartbeat events to the Distributor to inform it that the Node is up.
--max-sessions int 8 Maximum number of concurrent sessions. Default value is the number of available processors.
--override-max-sessions boolean false The # of available processors is the recommended max sessions value (1 browser session per processor). Setting this flag to true allows the recommended max value to be overwritten. Session stability and reliability might suffer as the host could run out of resources.
--register-cycle int 10 How often, in seconds, the Node will try to register itself for the first time to the Distributor.
--register-period int 120 How long, in seconds, will the Node try to register to the Distributor for the first time. After this period is completed, the Node will not attempt to register again.
--session-timeout int 300 Let X be the session-timeout in seconds. The Node will automatically kill a session that has not had any activity in the last X seconds. This will release the slot for other tests.
--vnc-env-var string[] SE_START_XVFB SE_START_VNC SE_START_NO_VNC Environment variable to check in order to determine if a vnc stream is available or not.
--no-vnc-port int 7900 If VNC is available, sets the port where the local noVNC stream can be obtained
--drain-after-session-count int 1 Drain and shutdown the Node after X sessions have been executed. Useful for environments like Kubernetes. A value higher than zero enables this feature.
--hub string http://localhost:4444 The address of the Hub in a Hub-and-Node configuration. Can be a hostname or IP address (hostname), in which case the Hub will be assumed to be http://hostname:4444, the --grid-url will be the same --publish-events will be tcp://hostname:4442 and --subscribe-events will be tcp://hostname:4443. If hostname contains a port number, that will be used for --grid-url but the URIs for the event bus will remain the same. Any of these default values may be overridden but setting the correct flags. If the hostname has a protocol (such as https) that will be used too.
--enable-cdp boolean true Enable CDP proxying in Grid. A Grid admin can disable CDP if the network does not allow websockets. True by default.
--enable-bidi boolean true Enable BiDi proxying in Grid. A Grid admin can disable BiDi if the network does not allow websockets. True by default.
--enable-managed-downloads boolean false This causes the Node to auto manage files downloaded for a given session on the Node.
--selenium-manager boolean false When drivers are not available on the current system, use Selenium Manager. False by default.
--connection-limit-per-session int 10 Let X be the maximum number of websocket connections per session. This will ensure one session is not able to exhaust the connection limit of the host.
--delete-session-on-ui boolean false Enable capability to support deleting a session via the Grid UI. False by default.
--register-shutdown-on-failure boolean false If enabled, the Node will shut down after the register period is completed without a successful registration. Useful in container environments to trigger a restart.
--node-down-failure-threshold int 3 Maximum number of consecutive session creation failures before the Node is marked as DOWN. A value of 0 (default) disables this feature and allows unlimited retries.

Relay

Option Type Value/Example Description
--service-url string http://localhost:4723 URL for connecting to the service that supports WebDriver commands like an Appium server or a cloud service.
--service-host string localhost Host name where the service that supports WebDriver commands is running
--service-port int 4723 Port where the service that supports WebDriver commands is running
--service-status-endpoint string /status Optional, endpoint to query the WebDriver service status, an HTTP 200 response is expected
--service-protocol-version string HTTP/1.1 Optional, enforce a specific protocol version in HttpClient when communicating with the endpoint service status
--service-configuration string[] max-sessions=2 stereotype='{"browserName": "safari", "platformName": "iOS", "appium:platformVersion": "14.5"}}' Configuration for the service where calls will be relayed to. It is recommended to provide this type of configuration through a toml config file to improve readability.

Router

Option Type Value/Example Description
--password string myStrongPassword Password clients must use to connect to the server. Both this and the username need to be set in order to be used.
--username string admin User name clients must use to connect to the server. Both this and the password need to be set in order to be used.
--sub-path string my_company/selenium_grid A sub-path that should be considered for all user facing routes on the Hub/Router/Standalone.
--disable-ui boolean true Disable the Grid UI.

Server

Option Type Value/Example Description
--external-url string http://10.0.1.1:33333 External URL where component is generally available. Useful on complex network topologies when components are on different networks and proxy servers are involved.
--allow-cors boolean true Whether the Selenium server should allow web browser connections from any host
--host string localhost Server IP or hostname: usually determined automatically.
--bind-host boolean true Whether the server should bind to the host address/name, or only use it to" report its reachable url. Helpful in complex network topologies where the server cannot report itself with the current IP/hostname but rather an external IP or hostname (e.g. inside a Docker container)
--https-certificate path /path/to/cert.pem Server certificate for https. Get more detailed information by running "java -jar selenium-server.jar info security"
--https-private-key path /path/to/key.pkcs8 Private key for https. Get more detailed information by running "java -jar selenium-server.jar info security"
--max-threads int 24 Maximum number of listener threads. Default value is: (available processors) * 3.
--port int 4444 Port to listen on. There is no default as this parameter is used by different components, for example, Router/Hub/Standalone will use 4444 and Node will use 5555.
--registration-secret string "Hunter2" Shared secret used to authenticate Node registration requests. Must match the value set on the Hub/Distributor.

SessionQueue

Option Type Value/Example Description
--sessionqueue / --sq uri http://localhost:1237 Address of the session queue server.
--sessionqueue-host string localhost Host on which the session queue server is listening.
--sessionqueue-port int 1234 Port on which the session queue server is listening.
--session-request-timeout int 300 Timeout in seconds. A new incoming session request is added to the queue. Requests sitting in the queue for longer than the configured time will timeout.
--session-request-timeout-period int 10 How often, in seconds, the timeout for queued new session requests is checked.
--session-retry-interval int 15 Retry interval in milliseconds. If all slots are busy, new session request will be retried after the given interval.
--sessionqueue-batch-size int 20 Maximum number of session requests that can be consumed from the queue at a time, based on the available slots.
--maximum-response-delay int 8 How often, in seconds, will the SessionQueue respond in case there is no data, to reduce the http requests while polling for new session requests. (Config file only; not a CLI flag.)

Sessions

Option Type Value/Example Description
--sessions uri http://localhost:1234 Address of the session map server.
--sessions-host string localhost Host on which the session map server is listening.
--sessions-port int 1234 Port on which the session map server is listening.

Configuration examples

All the options mentioned above can be used when starting the Grid components. They are a good way of exploring the Grid options, and trying out values to find a suitable configuration.

{{% pageinfo color="primary" %}} We recommend the use of [Toml files]({{< ref "toml_options.md" >}}) to configure a Grid. Configuration files improve readability, and you can also check them in source control.

When needed, you can combine a Toml file configuration with CLI arguments. {{% /pageinfo %}}

Command-line flags

To pass config options as command-line flags, identify the valid options for the component and follow the template below.

java -jar selenium-server-<version>.jar <component> --<option> value

Standalone, setting max sessions and main port

java -jar selenium-server-<version>.jar standalone --max-sessions 4 --port 4444

Hub, setting a new session request timeout, a main port, and disabling tracing

java -jar selenium-server-<version>.jar hub --session-request-timeout 500 --port 3333 --tracing false

Node, with 4 max sessions, with debug(fine) log, 7777 as port, and only with Firefox and Edge

java -jar selenium-server-<version>.jar node --max-sessions 4 --log-level "fine" --port 7777 --driver-implementation "firefox" --driver-implementation "edge"

Distributor, setting Session Map server url, Session Queue server url, and disabling bus

java -jar selenium-server-<version>.jar distributor --sessions http://localhost:5556 --sessionqueue http://localhost:5559 --bind-bus false

Setting custom capabilities for matching specific Nodes

Important: Custom capabilities need to be set in the configuration in all Nodes. They also need to be included always in every session request.

Start the Hub
java -jar selenium-server-<version>.jar hub
Start the Node A with custom cap set to true
java -jar selenium-server-<version>.jar node --detect-drivers false --driver-configuration display-name="Chrome (custom capability true)" max-sessions=1 stereotype='{"browserName":"chrome","gsg:customcap":true}' --port 6161
Start the Node B with custom cap set to false
java -jar selenium-server-<version>.jar node --detect-drivers false --driver-configuration display-name="Chrome (custom capability true)" max-sessions=1 stereotype='{"browserName":"chrome","gsg:customcap":false}' --port 6262
Matching Node A
ChromeOptions options = new ChromeOptions();
options.setCapability("gsg:customcap", true);
WebDriver driver = new RemoteWebDriver(new URL("http://localhost:4444"), options);
driver.get("https://selenium.dev");
driver.quit();

Set the custom capability to false in order to match the Node B.

Enabling Managed downloads by the Node

At times a test may need to access files that were downloaded by it on the Node. To retrieve such files, following can be done.

Start the Hub
java -jar selenium-server-<version>.jar hub
Start the Node with manage downloads enabled
java -jar selenium-server-<version>.jar node --enable-managed-downloads true
Set the capability at the test level

Tests that want to use this feature should set the capability "se:downloadsEnabled"to true

options.setCapability("se:downloadsEnabled", true);
How does this work
  • The Grid infrastructure will try to match a session request with "se:downloadsEnabled" against ONLY those nodes which were started with --enable-managed-downloads true
  • If a session is matched, then the Node automatically sets the required capabilities to let the browser know, as to where should a file be downloaded.
  • The Node now allows a user to:
    • List all the files that were downloaded for a specific session and
    • Retrieve a specific file from the list of files.
  • The directory into which files were downloaded for a specific session gets automatically cleaned up when the session ends (or) timesout due to inactivity.

Note: Currently this capability is ONLY supported on:

  • Edge
  • Firefox and
  • Chrome browser
Listing files that can be downloaded for current session:
  • The endpoint to GET from is /session/<sessionId>/se/files.
  • The session needs to be active in order for the command to work.
  • The raw response looks like below:
{
  "value": {
    "names": [
      "Red-blue-green-channel.jpg"
    ]
  }
}

In the response the list of file names appear under the key names.

Dowloading a file:
  • The endpoint to POST from is /session/<sessionId>/se/files with a payload of the form {"name": "fileNameGoesHere}
  • The session needs to be active in order for the command to work.
  • The raw response looks like below:
{
	"value": {
		"filename": "Red-blue-green-channel.jpg",
		"contents": "Base64EncodedStringContentsOfDownloadedFileAsZipGoesHere"
	}
}
  • The response blob contains two keys,
    • filename - The file name that was downloaded.
    • contents - Base64 encoded zipped contents of the file.
  • The file contents are Base64 encoded and they need to be unzipped.
List files that can be downloaded

The below mentioned curl example can be used to list all the files that were downloaded by the current session in the Node, and which can be retrieved locally.

curl -X GET "http://localhost:4444/session/90c0149a-2e75-424d-857a-e78734943d4c/se/files"

A sample response would look like below:

{
  "value": {
    "names": [
      "Red-blue-green-channel.jpg"
    ]
  }
}
Retrieve a downloaded file

Assuming the downloaded file is named Red-blue-green-channel.jpg, and using curl, the file could be downloaded with the following command:

curl -H "Accept: application/json" \
-H "Content-Type: application/json; charset=utf-8" \
-X POST -d '{"name":"Red-blue-green-channel.jpg"}' \
"http://localhost:4444/session/18033434-fa4f-4d11-a7df-9e6d75920e19/se/files"

A sample response would look like below:

{
  "value": {
    "filename": "Red-blue-green-channel.jpg",
    "contents": "UEsDBBQACAgIAJpagVYAAAAAAAAAAAAAAAAaAAAAUmVkLWJsAAAAAAAAAAAAUmVkLWJsdWUtZ3JlZW4tY2hhbm5lbC5qcGdQSwUGAAAAAAEAAQBIAAAAcNkAAAAA"
  }
}
Complete sample code in Java

Below is an example in Java that does the following:

  • Sets the capability to indicate that the test requires automatic managing of downloaded files.
  • Triggers a file download via a browser.
  • Lists the files that are available for retrieval from the remote node (These are essentially files that were downloaded in the current session)
  • Picks one file and downloads the file from the remote node to the local machine.
import com.google.common.collect.ImmutableMap;

import org.openqa.selenium.By;
import org.openqa.selenium.io.Zip;
import org.openqa.selenium.json.Json;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.openqa.selenium.remote.http.HttpClient;
import org.openqa.selenium.remote.http.HttpRequest;
import org.openqa.selenium.remote.http.HttpResponse;

import java.io.File;
import java.net.URL;
import java.nio.file.Files;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.TimeUnit;

import static org.openqa.selenium.remote.http.Contents.asJson;
import static org.openqa.selenium.remote.http.Contents.string;
import static org.openqa.selenium.remote.http.HttpMethod.GET;
import static org.openqa.selenium.remote.http.HttpMethod.POST;

public class DownloadsSample {

  public static void main(String[] args) throws Exception {
    // Assuming the Grid is running locally.
    URL gridUrl = new URL("http://localhost:4444");
    ChromeOptions options = new ChromeOptions();
    options.setCapability("se:downloadsEnabled", true);
    RemoteWebDriver driver = new RemoteWebDriver(gridUrl, options);
    try {
      demoFileDownloads(driver, gridUrl);
    } finally {
      driver.quit();
    }
  }

	private static void demoFileDownloads(RemoteWebDriver driver, URL gridUrl) throws Exception {
		driver.get("https://www.selenium.dev/selenium/web/downloads/download.html");
		// Download the two available files on the page
		driver.findElement(By.id("file-1")).click();
		driver.findElement(By.id("file-2")).click();

		// The download happens in a remote Node, which makes it difficult to know when the file
		// has been completely downloaded. For demonstration purposes, this example uses a
		// 10-second sleep which should be enough time for a file to be downloaded.
		// We strongly recommend to avoid hardcoded sleeps, and ideally, to modify your
		// application under test, so it offers a way to know when the file has been completely
		// downloaded.
		TimeUnit.SECONDS.sleep(10);

		//This is the endpoint which will provide us with list of files to download and also to
		//let us download a specific file.
		String downloadsEndpoint = String.format("/session/%s/se/files", driver.getSessionId());

		String fileToDownload;

		try (HttpClient client = HttpClient.Factory.createDefault().createClient(gridUrl)) {
			// To list all files that are were downloaded on the remote node for the current session
			// we trigger GET request.
			HttpRequest request = new HttpRequest(GET, downloadsEndpoint);
			HttpResponse response = client.execute(request);
			Map<String, Object> jsonResponse = new Json().toType(string(response), Json.MAP_TYPE);
			@SuppressWarnings("unchecked")
			Map<String, Object> value = (Map<String, Object>) jsonResponse.get("value");
			@SuppressWarnings("unchecked")
			List<String> names = (List<String>) value.get("names");
			// Let's say there were "n" files downloaded for the current session, we would like
			// to retrieve ONLY the first file.
			fileToDownload = names.get(0);
		}

		// Now, let's download the file
		try (HttpClient client = HttpClient.Factory.createDefault().createClient(gridUrl)) {
			// To retrieve a specific file from one or more files that were downloaded by the current session
			// on a remote node, we use a POST request.
			HttpRequest request = new HttpRequest(POST, downloadsEndpoint);
			request.setContent(asJson(ImmutableMap.of("name", fileToDownload)));
			HttpResponse response = client.execute(request);
			Map<String, Object> jsonResponse = new Json().toType(string(response), Json.MAP_TYPE);
			@SuppressWarnings("unchecked")
			Map<String, Object> value = (Map<String, Object>) jsonResponse.get("value");
			// The returned map would contain 2 keys,
			// filename - This represents the name of the file (same as what was provided by the test)
			// contents - Base64 encoded String which contains the zipped file.
			String zippedContents = value.get("contents").toString();
			// The file contents would always be a zip file and has to be unzipped.
			File downloadDir = Zip.unzipToTempDir(zippedContents, "download", "");
			// Read the file contents
			File downloadedFile = Optional.ofNullable(downloadDir.listFiles()).orElse(new File[]{})[0];
			String fileContent = String.join("", Files.readAllLines(downloadedFile.toPath()));
			System.out.println("The file which was "
					+ "downloaded in the node is now available in the directory: "
					+ downloadDir.getAbsolutePath() + " and has the contents: " + fileContent);
		}
	}


}