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[[File:Docker-architecture.svg|thumb|right|Docker Architecture|link=https://docs.docker.com/get-started/overview/#docker-architecture]]Linux containers (LXC)<ref>https://help.ubuntu.com/lts/serverguide/lxc.html</ref> technology has taken off with Docker https://www.docker.com/ <ref>[http://opensource.com/business/14/7/interview-j%C3%A9r%C3%B4me-petazzoni-docker See the interview on opensource.com]</ref> <ref>more info from Wikipedia [[wp:Docker_(software)]]</ref> which was released as open source in March 2013. RedHat and others have collaborated with the corporate backer to the technology seemingly to compete with Canonical's JuJu https://juju.ubuntu.com/ and Charm technology which also is based on Linux containers. Linux containers are built into the linux kernel, and so offer a lightweight native method of virtualization compared to more traditional (heavyweight) virtualization techniques like [[VMWare]], [[Vagrant]], [[VirtualBox]].

Essentially, the difference is the hypervisor and OS. Whereas containers are implemented with kernel features like namespaces, cgroups and chroots, a full VM requires a hypervisor plus an operating system in the VM. Docker runs a [https://docs.docker.com/get-started/overview/#docker-architecture docker daemon] on the Docker Host.

== Bring your own Node ==Docker Cloud lets you use your own host as a node to run containers. In order to do this, you have to first install the Docker Cloud Agent.<source lang="bash">curl -Ls * https://get.clouddocs.docker.com/ | sudo -H sh -s 7521e_PRIVATEKEY_7521e</source>And you must have incoming port 2375 open plus have 6783tcpdevelop/udp open The following Linux distributions are supported: * Ubuntu 14.04, 15.04* Debian 8* Centos 7* RedHat Linux 7* Fedora 21, 22 == Pricing == Pricing depends on whether it's cloud or premise (datacenter), and ranges from $15/mo for a single node in the cloud to $150 or $300/mo per node for datacenter engine depending on the level of support.<ref>https://www.docker.com/pricing#/pricing_cloud</ref>  == Installing on Ubuntu ==https://docs.docker.com/engine/installation/linux/docker-ceinstall/ubuntu/ Add the Docker repo, and installNote: it's only supported on 64-bit Ubuntu