Docker is actually a reasonably new and swiftly expanding project that makes it possible for to make really light “virtual machines”. The quotation marks here are important, what Docker makes it possible for you to create aren't actually virtual machines, they’re more akin to chroots on steroids, lots of steroids. Within this tutorial we'll explore what Docker can do for you and how does it do what it does.
Just before we continue, let me clear anything up. As of right now (4th of January of 2015) Docker operates only on Linux, it can not function natively on Windows or OSX. I’ll be talking in regards to the architecture of Docker later on along with the reason will develop into clear. So if you want Docker on a platform that is definitely not Linux, you’ll need to run Linux on a VM.
This tutorial has three objectives: explaining what dilemma it solves, explaining how it solves it at a high level, and explaining what technologies does it use to resolve it. This really is not a step-by-step tutorial, there are actually already numerous excellent step-by-step tutorials on Docker, like an internet interactive a single in the authors of Docker. That said, there's a tiny step-by-step in the end, it really is just there to connect all of the theory I present through the post using a clearcut realworld instance, but is by no implies exhaustive.
What can Docker can do for you personally?
Docker solves numerous on the very same difficulty that a VM solves, plus some other that VMs could solve if they didn’t were so resource intensive. Right here are some of the items that Docker can take care of:
Isolating an application dependencies
Generating an application image and replicating it
Generating prepared to start applications that happen to be simply distributable
Enabling simple and speedy scalation of instances
Testing out applications and disposing them afterwards
The idea behind Docker will be to make portable lightweight containers for software applications that may be run on any machine with Docker installed, no matter the underlying OS, akin towards the cargo containers applied on ships. Pretty ambitious, and they’re succeeding.
What does Docker do precisely?
Within this section I'll not be explaining what technologies Docker makes use of to do what it does, or what particular commands are offered, that is on the final section, here I’ll explain the resources and abstractions that Docker gives.
The two most significant entities in Docker are images and containers. Apart from those, hyperlinks and volumes are also significant. Let’s get started with pictures.
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