1. Basic Concepts A Dockerfile is a collection of instructions for building a Docker image. Docker reads Dockerfile instructions to build an image automatically. A Dockerfile is similar to a Makefile: both are text files that organize all the instructions in the order the image is built. The command to build a Docker image:

Vagrant is suited to managing virtual machines, while Docker is suited to managing application environments. To better simulate a real runtime environment, this series of articles uses Docker and Docker Compose to build a development environment of Nginx + uWSGI + Django + MySQL + Redis + Rabbit. 1. Basic

1. Basic Website Performance Metrics Concurrency: the number of sessions the server handles per unit of time Throughput: the number of requests the server handles per unit of time Response time: the total elapsed time from when the user sends a request to when the response is fully received, made up of network transmission time, service processing time, and other parts Average response time: the average of the response times of all requests 2.

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1. About PaaS 1.1 What Is PaaS PaaS is short for Platform as a Service, a type of cloud computing service that provides a computing platform along with solution services. The emergence of PaaS accelerated the growth of SaaS, and in particular sped up the development of SaaS applications. For example, when developing SaaS, using the login, database, cache, and other services uniformly provided by a PaaS platform greatly reduces the manpower and cost of building those services.