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Before we begin

A Python project, based on Python:3.6 and Django:1.11 framework development, hopes that the project can be containerized, and then you can orchestrate containers / applications through tools such as docker-compose. The goal of this article is to customize the basic image of Django.

And "Why do you need to customize a basic image? "the article is the same, the basic mirroring function is to provide support for project mirroring. It is built on the official image of Python, adding some required extension modules of the project, such as Django, pymysql, Gunicorn and other common modules, depending on the actual requirements of the project.

Finally, in order to handle static file requests efficiently, use Nginx reverse proxy Django application, but this is the next article, "Django Container (part two): managing Django with Gunicorn", please look forward to the official account to update the article every Thursday.

Environment description container image: python:3.6 container system: debian 9 (stretch) Docker version: CE-17.06.0Docker host: Ubuntu Server 16.04. basic image construction directory tree base/base/ ├── conf │ ├── 404.html │ ├── default.conf │ ├── nginx.conf │ ├── requirements.txt │ ├── sources.list │ ├── ssl │ │ ├── domain.crt │ │ └── domain.key │ └── supervisord.conf └── `Dockerfile`2 directories 9 files basic image Dockerfile file cat base/Dockerfile# start-baseFROM python:3.6MAINTAINER dongnan # # aptCOPY conf/sources.list / etc/apt/sources.listRUN apt-get update\ & & apt-get install-y supervisor nginx\ & & apt-get clean\ & & rm-r / var/lib/apt/lists/*# envENV TZ=Asia/Shanghai\ LANG=en_US.UTF-8# django COPY conf/requirements.txt / root/RUN pip-- no-cache-dir install- R / root/requirements.txt-I https://mirrors.aliyun.com/pypi/simple/

This Dockerfile is very short, because it is the basic image of the project, you only need to do some basic work.

It first installs the supervisor nginx package and then sets the environment variables for the container.

Finally, using pip to install project dependencies, django and pymysql are defined in the requirements.txt file.

Build an image docker build-t start-base .Sending build context to Docker daemon 767kBStep 1 Universe 8: FROM python:3.6#... Omit Successfully built fc3f6f242301Successfully tagged start-base authentication image

Once the basic image is ready, it can be used in the project image. There is no TAG tag for the base image, so it is the default latest. Docker images-- format "{{.Repository}} {{.tag}}" start-base latest summary

Finally, let's summarize the knowledge points in the article.

The role of the basic image is to provide support for the project image, and add the project code to the basic image to complete the construction of the project image. Use supervisor to manage nginx, gunicorn (python WSGI Server) processes in the container. Pip is a python package management tool, which provides the functions of finding, downloading, installing and uninstalling python packages. Pip-I option, which specifies the address of the warehouse. The default is https://pypi.org/simple repositories * very slow * * it is recommended to use domestic warehouses.

Reference article

Doker&k8s Qun [703906133]

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