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| <h2>The Linux container engine</h2> |
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| <h5> |
| Docker is an open-source engine which automates the deployment of applications as highly portable, self-sufficient containers which are independent of hardware, language, framework, packaging system and hosting provider. |
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| <h4>Heterogeneous payloads</h4> |
| <p>Any combination of binaries, libraries, configuration files, scripts, virtualenvs, jars, gems, tarballs, you name it. No more juggling between domain-specific tools. Docker can deploy and run them all.</p> |
| <h4>Any server</h4> |
| <p>Docker can run on any x64 machine with a modern linux kernel - whether it's a laptop, a bare metal server or a VM. This makes it perfect for multi-cloud deployments.</p> |
| <h4>Isolation</h4> |
| <p>Docker isolates processes from each other and from the underlying host, using lightweight containers.</p> |
| <h4>Repeatability</h4> |
| <p>Because each container is isolated in its own filesystem, they behave the same regardless of where, when, and alongside what they run.</p> |
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| <h4>Do you think it is cool to hack on docker? Join us!</h4> |
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| <li>Work on open source</li> |
| <li>Program in Go</li> |
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| <a href="http://dotcloud.theresumator.com/apply/mWjkD4/Software-Engineer.html" title="Job description">read more</a> |
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| <h1>New! Docker Index</h1> |
| On the Docker Index you can find and explore pre-made container images. It allows you to share your images and download them. |
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| <img src="https://si0.twimg.com/profile_images/2707460527/252a64411a339184ff375a96fb68dcb0_bigger.png"> |
| <em>Mitchell Hashimoto@mitchellh:</em> Docker launched today. It is incredible. They’re also working RIGHT NOW on a Vagrant provider. LXC is COMING!! |
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| <img src="https://si0.twimg.com/profile_images/1108290260/Adam_Jacob-114x150_original_bigger.jpg"> |
| <em>Adam Jacob@adamhjk:</em> Docker is clearly the right idea. @solomonstre absolutely killed it. Containerized app deployment is the future, I think. |
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| <em>Matt Townsend@mtownsend:</em> I have a serious code crush on docker.io - it's Lego for PaaS. Motherfucking awesome Lego. |
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| <img src="https://si0.twimg.com/profile_images/1312352395/rupert-259x300_bigger.jpg"> |
| <em>Rob Harrop@robertharrop:</em> Impressed by @getdocker - it's all kinds of magic. Serious rethink of AWS architecture happening @skillsmatter. |
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| <em>John Willis @botchagalupe:</em> IMHO docker is to paas what chef was to Iaas 4 years ago |
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| <em>John Feminella @superninjarobot:</em> So, @getdocker is pure excellence. If you've ever wished for arbitrary, PaaS-agnostic, lxc/aufs Linux containers, this is your jam! |
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| <em>David Romulan @destructuring:</em> I haven't had this much fun since AWS |
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| <em>Ricardo Gladwell @rgladwell:</em> wow @getdocker is either amazing or totally stupid |
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| <h2>Notable features</h2> |
| |
| <ul> |
| <li>Filesystem isolation: each process container runs in a completely separate root filesystem.</li> |
| <li>Resource isolation: system resources like cpu and memory can be allocated differently to each process container, using cgroups.</li> |
| <li>Network isolation: each process container runs in its own network namespace, with a virtual interface and IP address of its own.</li> |
| <li>Copy-on-write: root filesystems are created using copy-on-write, which makes deployment extremely fast, memory-cheap and disk-cheap.</li> |
| <li>Logging: the standard streams (stdout/stderr/stdin) of each process container is collected and logged for real-time or batch retrieval.</li> |
| <li>Change management: changes to a container's filesystem can be committed into a new image and re-used to create more containers. No templating or manual configuration required.</li> |
| <li>Interactive shell: docker can allocate a pseudo-tty and attach to the standard input of any container, for example to run a throwaway interactive shell.</li> |
| </ul> |
| |
| <h2>Under the hood</h2> |
| |
| <p>Under the hood, Docker is built on the following components:</p> |
| |
| <ul> |
| <li>The <a href="http://blog.dotcloud.com/kernel-secrets-from-the-paas-garage-part-24-c">cgroup</a> and <a href="http://blog.dotcloud.com/under-the-hood-linux-kernels-on-dotcloud-part">namespacing</a> capabilities of the Linux kernel;</li> |
| <li><a href="http://aufs.sourceforge.net/aufs.html">AUFS</a>, a powerful union filesystem with copy-on-write capabilities;</li> |
| <li>The <a href="http://golang.org">Go</a> programming language;</li> |
| <li><a href="http://lxc.sourceforge.net/">lxc</a>, a set of convenience scripts to simplify the creation of linux containers.</li> |
| </ul> |
| |
| <h2>Who started it</h2> |
| <p> |
| Docker is an open-source implementation of the deployment engine which powers <a href="http://dotcloud.com">dotCloud</a>, a popular Platform-as-a-Service.</p> |
| |
| <p>It benefits directly from the experience accumulated over several years of large-scale operation and support of hundreds of thousands |
| of applications and databases. |
| </p> |
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