Docker first __docker

Docker open source code storage location:

Https://github.com/docker/docker

Docker's vision is a package that runs everywhere , through the encapsulation , distribution , deployment , and Operation Lifecycle management of the application. The application here can be Web applications , a compilation environment, a database platform , an operating system , or a cluster

The birth of Docker is based on the Linux container (LXC) technology

a description of the container technology

The container effectively divides the resources managed by a single operating system into isolated groups to better balance conflicting resource usage requirements among orphaned groups, which requires neither command-level impersonation nor Just-in-time compilation, as compared to virtualization. A container can run instructions locally on the core CPU without requiring any specialized interpretation mechanism. In addition, the complexities of virtualization and system call substitution are also avoided.

The advantages of Docker in development and Operation Dimension
-Faster delivery and deployment
-More efficient use of resources
-Kernel-level virtualization
-Easier migrations and extensions
-Simpler update management
-Dockerfile

comparison of Docker and virtual machines Docker easy access, distribution, and update mirroring via a git-like design concept, storage reuse, incremental update docker improve productivity and standardize processes through dockerfile support for flexible automated creation and deployment mechanisms

Docker is part of the operating system-level virtualization category

attribute	container	virtual machine
start Speed	Second level	minute level
performance	close to original	weaker
Memory Price	very small	many
hard disk use	general MB	General gb
run density	stand-alone supports thousands of containers	general dozens of
Quarantine	security isolation	full isolation
Migration	excellent	General