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In theory he's totally right. In practice Docker is bringing all these things in a unified and standard tools — basically bringing such technology to the "masses".

If you can craft your own system, feel free to move forward with that.

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The power of docker became clear to me when I handed basic instructions to our web devs and watched it just work. The tooling was docker's secret sauce, nothing more. And, yes, you still need somebody who knows what the system is actually doing keeping an eye on things; you can't just hand a bunch of devs docker and fire your ops team.

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