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You can build a house out of random pieces of scrap wood, but it probably won't hold up well over time, or during a hurricane, etc. Docker is more like standard measurements and lumber, allowing one group to build the rooms, and another group to build the plumbing, roof, etc and shove it all together. It can take you longer to go the latter route, at least until you're all very practiced at this new method. But once you get the hang of it, changing the house becomes cheaper, easier, faster and more reliable. From a developer's standpoint, Docker can help speed development by keeping all developers on the same page. If everyone develops and tests using one container, there's less chance for certain kinds of bugs when integrating. You can do the same with, say, Linux packages, but Docker alleviates the need to learn different distros' packaging formats, and solves common dependency and isolation problems. Less time trying to fix your builds due to incompatibility, almost no need to use configuration management tools. This saves you time and complexity, at the cost of the complexity of Docker itself. |