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For a simple local or CI setup, run an official Selenium Standalone browser container, publish its Grid port, and connect your tests with RemoteWebDriver at http://localhost:4444. Use a versioned image tag for repeatable runs; add Grid nodes only when you need more parallel sessions or browser coverage.
What Docker changes about a Selenium test run
With a local WebDriver, the test process starts and controls a browser on the same machine. With Selenium Grid in Docker, the test client sends WebDriver commands to a remote endpoint; Grid routes them to a browser instance running in a container. This is useful for remote execution, parallel sessions, and testing different browsers or versions. See Selenium Grid documentation.
Standalone mode puts the Grid components in one process and is the simplest starting point. Its default WebDriver endpoint is http://localhost:4444. The official Docker Selenium project provides browser images for standalone use and for nodes in larger Grid setups.
Start a standalone browser container
-
Choose the browser image and an actual versioned tag from the official project registry. Do not copy the placeholder in this example literally.
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Start the container and publish its Grid port:
docker run -d --name selenium -p 4444:4444 selenium/standalone-chrome:4.49.0This uses a concrete Selenium version as an example, not a guarantee that this exact tag remains available or is the right browser/driver combination for your project. Confirm the image tag and compatibility before running it; the official image project documents its naming and available images.
-
Check that the container is running with
docker ps. If it exited, inspect its output withdocker logs seleniumbefore trying to connect. -
Configure the test framework’s remote WebDriver executor URL as
http://localhost:4444when the test client runs on the host machine.
The Selenium Grid guide describes the Standalone mode and endpoint at Getting started with Selenium Grid.
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Connect a test client with RemoteWebDriver
The exact constructor and browser options depend on the language binding and its version, so use that binding’s RemoteWebDriver API and pass the Grid endpoint as the remote command URL. For example, in Java the central connection pattern is:
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WebDriver driver = new RemoteWebDriver(
new URL("http://localhost:4444"),
new ChromeOptions()
);
try {
driver.get("https://example.com");
System.out.println(driver.getTitle());
} finally {
driver.quit();
}Import the matching Selenium Java classes (WebDriver, RemoteWebDriver, ChromeOptions, and URL) and include the Selenium Java binding in the project. Keep session creation and shutdown in the test lifecycle so a failed assertion does not leave a browser session running. Selenium’s quick-start guidance likewise directs clients to localhost:4444 when the Grid is available on the host.
When the test client is also in Docker
Inside a container, localhost means that same test container, not the Selenium container. Put the test and browser services on a shared Docker network, then use the Selenium service or container name and port 4444 as the RemoteWebDriver host. For instance, a service named selenium is typically addressed from a peer container as http://selenium:4444. The correct name depends on the network and service naming in your Compose or Docker setup.
Choose standalone or a multi-node Grid
| Setup | Best fit | Trade-off |
|---|---|---|
| Standalone container | Local debugging, a single browser target, or a modest CI job | One container is simpler to operate, but it provides less capacity and browser diversity than a multi-node setup. |
| Grid with multiple nodes | Parallel sessions or coverage across browser families, versions, or platforms | More configuration and capacity planning; more nodes do not make tests safe to parallelize if they share mutable application state. |
Grid routes sessions to available nodes; it does not remove test-level dependencies. Before enabling parallel execution, check whether tests share accounts, records, files, or other mutable state. Selenium explains Grid’s uses in its Grid guide.
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A floating tag such as latest can change the browser or server version between runs. Pin an explicit image tag when you need reproducible environments or are investigating a browser-specific failure. During upgrades, check the official release and image information to confirm that the server image, browser, driver, and client binding work together.
As of October 3, 2026, Selenium’s downloads page lists Selenium 4.49.0 as stable, released September 9, 2026. That release information is time-sensitive; check the page again when selecting a tag.
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Selenium announced that its official Docker images are mirrored to GHCR as well as Docker Hub in its April 4, 2026 announcement. The GHCR namespace is ghcr.io/seleniumhq. Use the registry and image naming documented by Selenium for the tag you select.
Plan capacity and parallel sessions
Size depends on the host, browser, test workload, and desired concurrency. Selenium’s getting-started guidance recommends 1 CPU and 1 GB RAM per browser as an initial reference, while explicitly cautioning that it may not suit every context and advising ongoing measurement. It is not a performance guarantee. See When to Use Grid.
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Begin with one session and measure CPU, memory, test duration, and failures under your own workload.
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Increase concurrency gradually, watching for resource contention and application-side rate limits.
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Use additional nodes when the required browser coverage or elapsed-time target justifies their operational and resource cost.
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Do not interpret Selenium’s illustrative arithmetic about distributing tests across nodes as a benchmark; actual speedup depends on the workload and bottlenecks.
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Secure the Grid endpoint
A reachable WebDriver endpoint is a control interface, not a public website. Selenium warns that an inadequately protected Grid can expose infrastructure and internal applications or files, and may allow third parties to run custom binaries. Keep the endpoint on a private network, bind or publish ports only where needed, and apply firewall or network rules so only intended test clients can reach it. Do not expose port 4444 to untrusted networks. See Selenium’s Grid security guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common connection failures
RemoteWebDriver cannot connect
-
Cause: The container is stopped, the port was not published, or the test URL points to the wrong host.
-
Fix: Check
docker psanddocker logs selenium, confirm the-p 4444:4444mapping, then usehttp://localhost:4444from the host. From a peer container, use the Grid service name on the shared network instead of localhost.
Browser session creation fails
-
Cause: The requested browser is not in the image, the image tag is invalid, or client capabilities do not match the available browser.
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Fix: Verify the selected official image and tag, request the browser it contains, and check the current Selenium image/release information for compatible server, browser, and driver versions.
Tests are slower or less reliable after increasing concurrency
-
Cause: The host may be resource-constrained, or tests may depend on shared mutable state.
-
Fix: Measure CPU and memory while reducing parallel sessions, then isolate test data and shared resources before increasing capacity again.
Grid works locally but is unreachable from CI or another container
-
Cause: The endpoint is being interpreted in the wrong network namespace, or the CI job and Grid do not share a reachable network.
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Fix: Map the topology explicitly: host-run tests use the host-published address; container-run tests need a shared network and the Grid’s reachable service name. Avoid publishing the endpoint more broadly than the test job requires.
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Frequently Asked Questions
Can Docker Selenium run Firefox instead of Chrome?
Yes. Choose an official Firefox browser image and a compatible versioned tag from the Docker Selenium project.
Does Selenium Grid make every test safe to run in parallel?
No. Tests that share mutable application state or other resources can still conflict; isolate those dependencies before parallelizing.
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