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What does this e2e tests in webapp ?

I don't understand why you need to rebuild docker image every app build, this seems like really wasteful.

If the app itself is part of the image you need to rebuild the image every time a dev wants to test their change.

Is that the same as redeploying your app to an existing container?

That doesn’t really have a meaning. Are you asking if it updates an existing Docker image, or even updates an existing Docker container (i.e. a running process)? If so, the answers would be ‘yes’ and ‘no’ respectively.

Example.

ImageA: ubuntu + apache + yourPhpApplication ImageB: ubuntu + apache

To deploy ImageA all you need to do is run the image. To deploy image B you need to run ImageB along with a copy of your application

Above I was describing ImageA.

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