A, docker introduction
1. Background
Since the initial deployment of a server methods take up more resources, slow and prone to migration and expansion, hence the virtual machine can be a multiple virtual servers on a single server to deploy multiple applications of an application. However, the virtual machine is a complete system for each virtual system, you need to consume resources and limited capacity, its speed is not fast.
docker container to achieve development, standardized testing and production environments, mirroring as a standard deliverable to achieve a consistent application and operating environment depend on three conditions. Container is not a simulation of an entire operating system, but the process of isolation, in the normal course coat a protective layer, the environment for the process of the container is in contact with is virtual, in order to achieve and isolation of the underlying system. It started and virtual machine compared to faster, less resource intensive, smaller.