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Overview

In your CodePipeline step, you're using the CHANGE_SET_CREATE action mode. This creates a change set on the CloudFormation Stack, but does not automatically execute it. You would need a second action that executes the change set using CHANGE_SET_EXECUTE. Alternatively, you can change the action mode on your action to CREATE_UPDATE which should directly update your action.

One reason you might want to use CHANGE_SET_CREATE and CHANGE_SET_EXECUTE in CodePipeline, is if you want to have an approval step between them. If you are expecting this to be completed automatically, I'd recommend CREATE_UPDATE.

CREATE_UPDATE example

Below is your CodePipeline Staging stage, but using CREATE_UPDATE instead of CREATE_CHANGE_SET. This creates a new stack named stack, or updates the existing one if one with that name already exists.

The issue you're having is that Capybara, by default, starts the AUT bound to 127.0.0.1 and then tells the driver to have the browser request from the same. In your case however 127.0.0.1 isn't where the app is running (From the browsers perspective), since it's on a different container than the browser. To fix that, you need to set Capybara.server_host to whatever the external interface of the "web" container is (which is reachable from the "chromedriver" container). That will cause Capybara to bind the AUT to that interface and tell the driver to have the browser make requests to it.

In your case that probably means you can specify 'web'

you directConnect: true, in your protractor.cong.js to directly run your test cases rather using a webdriver!