Research about Docker

Knowledge Sharing:
1. Here it is important to note that Docker runs 1 process per container, which is a major difference from other container engines like Warden.
2. Everything at Google runs in a container. Google starts over 2 billion containers per week.
3.  But with commoditization of Containers in the form of Docker, Warden, etc. opportunities have opened up for developers and dev-ops to better manage and control the deployment and scaling of applications.
4.  without PaaS, Docker is just a bunch of containers. The advantages of Docker are realized when used in an enterprise cloud stack or PaaS environment. The ease of deployment and portability make containers an essential part of PaaS.
5.  I believe PaaS and Containers like Docker are not competing technologies, but rather complementary. In fact this elastic mesh of containers composing an Application is what makes PaaS so efficient.
6.  Microservices, is the new kid in the block, and is considered the next big thing in software architecture. You can look at it as 'fine-grained SOA’ - an approach to developing an application as a suite of small services, each running in its own process and communicating with each other using some light-weight mechanism, with independent deployments, scalability and portability. You should already see how Containers just perfectly fits into that context!
7.  Warden is the container orchestration engine for Cloud Foundry, which exposes APIs for managing the isolated environments. All applications deployed to Cloud Foundry runs within a Warden container. It constitutes a warden server and a ruby based warden client. The server and client interface using Google protocol buffers.
8.  The service-as-a-VM approach is popular way of packaging and deploying services. For example, the Netflix video streaming service consists of many services each packaged as an AMI and deployed on Amazon EC2.
9.  Docker is a new way to containerize applications that is becomingly increasingly popular. It allows you to package a microservice in a standardized portable format that’s independent of the technology used to implement the service. At runtime it provides a high degree of isolation between different services. However, unlike virtual machines, Docker containers are extremely lightweight and as a result can be built and started extremely quickly. A container can typically be built in just a few seconds and starting a container simply consists of starting the service’s process(es).
10.  The two main Docker concepts are image, which is a portable application packaging format, and container, which is a running image and consists of one or more sandboxed processes. 
11.  A Docker container is a running image consisting of one or more sandboxed processes. 
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Reference:
http://stackoverflow.com/questions/28700859/correct-way-to-manage-database-schemas-in-docker