boot2docker is a lightweight Linux distribution based on Tiny Core Linux made specifically to run Docker containers. It runs completely from RAM, weighs ~27MB and boots in ~5s (YMMV).
boot2docker is a tool in the Infrastructure as a Service category of a tech stack.
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What are some alternatives to boot2docker?
Vagrant provides the framework and configuration format to create and manage complete portable development environments. These development environments can live on your computer or in the cloud, and are portable between Windows, Mac OS X, and Linux.
It is an open-source API, daemon and management tool for managing platform virtualization. It can be used to manage KVM, Xen, VMware ESXi, QEMU and other virtualization technologies.
It is a leading virtualization management platform optimized for application, desktop and server virtualization infrastructures. It is used in the world's largest clouds and enterprises.
Otto automatically builds development environments without any configuration; it can detect your project type and has built-in knowledge of industry-standard tools to setup a development environment that is ready to go. When you're ready to deploy, otto builds and manages an infrastructure, sets up servers, builds, and deploys the application.
Docker, VirtualBox, Weave, Docker are some of the popular tools that integrate with boot2docker. Here's a list of all 4 tools that integrate with boot2docker.