Pixies, part 2: What you wanted to know about Docker but were afraid to ask
Docker in a nutshell Docker allows you to create self-contained turnkey images which contain everything one needs to run your application. These can be copied, shared, uploaded and deleted, when not needed anymore. When I need to run PostgreSQL or, say, Redis on my box I do not bother anymore installing this software and pollute my hard-drive. I just pull corresponding image and run it on my box. When I don’t need the image anymore I simply delete it and my hard-disk is back to the state it was before.
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