How do I connect to a localhost site using Selenium Docker image?

Question

I have a node application that I can start with node server.js and access on localhost:9000.

I have a series of e2e tests on selenium that run fine, but I am now looking to use the docker selenium image.

I start the docker image with docker run -d -p 4444:4444 selenium/standalone-chrome

and I changed my e2e test code to look like:

  var driver = new webdriver.Builder().
  usingServer('http://127.0.0.1:4444/wd/hub').
  withCapabilities(webdriver.Capabilities.chrome()).
  build();

  // driver.manage().window().setSize(1600, 1000);

  return driver.get('http://127.0.0.1:9000')
    .then(function() {
      // driver.executeScript('localStorage.clear();')
      return driver
    });

But selenium fails to connect to the app at all!

(If I uncomment the setSize line, the program fails right there)

I have the server up an running, and it's indeed accessible at localhost:9000. How can I get my test to properly use dockerized selenium, and properly point to a server on localhost?

Which host OS are you using?

Tarun Lalwani
– Tarun Lalwani

2017-10-19 12:56:28 +00:00
Commented Oct 19, 2017 at 12:56 — Tarun Lalwani
– Tarun Lalwani, Commented Oct 19, 2017 at 12:56

herm · Accepted Answer · 2017-10-16 04:43:02Z

1

If you want your container network behaviour to be like your host machines use docker run --network=host

answered Oct 16, 2017 at 4:43

herm

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MatTheWhale · Accepted Answer · 2017-10-13 20:39:56Z

0

From the host machine, Docker endpoints aren't accessible at localhost. Did you try using 0.0.0.0 instead of 127.0.0.1?

answered Oct 13, 2017 at 20:39

MatTheWhale

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1 Comment

swagrov Over a year ago

I changed to usingServer('http://0.0.0.0:4444/wd/hub'). and the tests still don't run. I have a test that prints the body and it says "This site can’t be reached."

cell-in · Accepted Answer · 2017-10-15 07:22:43Z

0

If you are using mac, you may try to get gateway from netstat inside docker image:

netstat -nr | grep '^0\.0\.0\.0' | awk '{print $2}'

or write ifconfig from terminal, and get the inet address, try with that instead of 127.0.0.1.

answered Oct 15, 2017 at 7:22

cell-in

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Comments

Sounak Saha · Accepted Answer · 2017-10-16 04:37:27Z

0

What is docker ps command is returning for this container? Is it display like "0.0.0.0:4444->4444/tcp". ?

You can run sudo iptables -L -n and verify under "Chain DOCKER" section below line should come. ACCEPT tcp -- 0.0.0.0/0 x.x.x.x tcp dpt:4444

edited Oct 16, 2017 at 4:37

answered Oct 15, 2017 at 8:36

Sounak Saha

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Comments

Ophir Yoktan · Accepted Answer · 2017-10-16 04:52:32Z

0

Just to make sure I understand - the selenium runs in the docker, and tries to access the node app that runs on the server?

In this case, these are two different "servers", so you need to use real IP addresses (or dns names)

pass the ip of the server as a parameter to the dockerized selenium image the simplest thing would probably be as an environment variable

answered Oct 16, 2017 at 4:52

Ophir Yoktan

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