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Side question. I'm well aware of the benefits of docker but, has anybody measured performance degradation due to lack of machine specialization? Back in the web 1.0 days it was common knowledge that you start in 1 server, then you split into 1 app server and 1 database server and you can get 4x the capacity. Did we lose all that with the docker way? Is it not so relevant anymore with modern multicore CPUs?

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Docker doesn't force you to put your app and your db on the same image. That is up to you. Most have "App" images and "DB" images separate.

If we want to get really specific, Its also common to see the "DB" image split up between the image of the disk where the data is actually persisted, and the image of the actual DB process. This makes it easy to play around with your data under different versions of your DB.

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