docker版Django

原文位址： http://kekefund.com/2017/03/30/docker-django/

（本人部落格）

Django的運作是基于python的環境，加上django包。在docker中運作django，實作方式是從docker下載下傳python鏡像，然後安裝django運作所依賴的包。

在

https://store.docker.com/images/python?tab=description

中介紹pull鏡像方式有一種叫python:onbuild。

這種鏡像建立方式根據項目中提供的requirements.txt檔案自動pip安裝依賴包。大多數情況，通過python:onbuild能建立一個滿足工程所需的獨立鏡像。

一、編寫requirements.txt

下述的目錄結構是一個Django Rest Framework例子，其中項目名稱為restful，app名稱為api。

首先我們需要把項目所依賴的包放到requirements.txt中：

Django==1.8
django-bootstrap-toolkit==2.15.0
django-filter==1.0.1
djangorestframework==3.5.4
djangorestframework-jwt==1.10.0
pandas==0.19.2
SQLAlchemy==1.1.4
MySQL-python==1.2.5
           

二、編寫Dockerfile

本文是基于python2.7制作的，Dockerfile檔案如下：

FROM python:2-onbuild
CMD [ "python", "./manage.py", "runserver", "0.0.0.0:8000"]
           

CMD指令執行Django啟動程式，0.0.0.0是對所有IP開放，監聽端口8000。

需要說明的是CMD中的每個參數得單獨分開，像這樣"runserver 0.0.0.0:8000"是運作不成功的。

2.1 pip 國内鏡像

先建立pip.conf檔案，使用阿裡雲作為鏡像：

[global]
index-url = http://mirrors.aliyun.com/pypi/simple/

[install]
trusted-host=mirrors.aliyun.com
           

在建立Dockerfile:

FROM python:3.5

RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app

COPY pip.conf /root/.pip/pip.conf
COPY requirements.txt /usr/src/app/
RUN pip install -r /usr/src/app/requirements.txt

RUN rm -rf /usr/src/app
COPY . /usr/src/app

CMD [ "python", "./manage.py", "runserver", "0.0.0.0:8091"]
           

三、建構鏡像

• $ docker build -t my-python-app .

[cbb@number_api]$ docker build -t number_api_django:0.3 .
Sending build context to Docker daemon 655.9 kB
Step 1/2 : FROM python:2-onbuild
# Executing 3 build triggers...
Step 1/1 : COPY requirements.txt /usr/src/app/
Step 1/1 : RUN pip install --no-cache-dir -r requirements.txt
 ---> Running in 4711187b3011
Collecting Django==1.8 (from -r requirements.txt (line 2))
  Downloading Django-1.8-py2.py3-none-any.whl (6.2MB)
Collecting django-bootstrap-toolkit==2.15.0 (from -r requirements.txt (line 3))
  Downloading django-bootstrap-toolkit-2.15.0.tar.gz
Collecting django-filter==1.0.1 (from -r requirements.txt (line 4))
  Downloading django_filter-1.0.1-py2.py3-none-any.whl (54kB)
Collecting djangorestframework==3.5.4 (from -r requirements.txt (line 5))
  Downloading djangorestframework-3.5.4-py2.py3-none-any.whl (709kB)
Collecting djangorestframework-jwt==1.10.0 (from -r requirements.txt (line 6))
  Downloading djangorestframework_jwt-1.10.0-py2.py3-none-any.whl
Collecting pandas==0.19.2 (from -r requirements.txt (line 7))
  Downloading pandas-0.19.2-cp27-cp27mu-manylinux1_x86_64.whl (17.2MB)
Collecting SQLAlchemy==1.1.4 (from -r requirements.txt (line 8))
  Downloading SQLAlchemy-1.1.4.tar.gz (5.1MB)
Collecting MySQL-python==1.2.5 (from -r requirements.txt (line 9))
  Downloading MySQL-python-1.2.5.zip (108kB)
Collecting PyJWT<2.0.0,>=1.4.0 (from djangorestframework-jwt==1.10.0->-r requirements.txt (line 6))
  Downloading PyJWT-1.4.2-py2.py3-none-any.whl
Collecting pytz>=2011k (from pandas==0.19.2->-r requirements.txt (line 7))
  Downloading pytz-2016.10-py2.py3-none-any.whl (483kB)
Collecting numpy>=1.7.0 (from pandas==0.19.2->-r requirements.txt (line 7))
  Downloading numpy-1.12.1-cp27-cp27mu-manylinux1_x86_64.whl (16.5MB)
Collecting python-dateutil (from pandas==0.19.2->-r requirements.txt (line 7))
  Downloading python_dateutil-2.6.0-py2.py3-none-any.whl (194kB)
Requirement already satisfied: six>=1.5 in /usr/local/lib/python2.7/site-packages (from python-dateutil->pandas==0.19.2->-r requirements.txt (line 7))
Installing collected packages: Django, django-bootstrap-toolkit, django-filter, djangorestframework, PyJWT, djangorestframework-jwt, pytz, numpy, python-dateutil, pandas, SQLAlchemy, MySQL-python
  Running setup.py install for django-bootstrap-toolkit: started
    Running setup.py install for django-bootstrap-toolkit: finished with status 'done'
  Running setup.py install for SQLAlchemy: started
    Running setup.py install for SQLAlchemy: finished with status 'done'
  Running setup.py install for MySQL-python: started
    Running setup.py install for MySQL-python: finished with status 'done'
Successfully installed Django-1.8 MySQL-python-1.2.5 PyJWT-1.4.2 SQLAlchemy-1.1.4 django-bootstrap-toolkit-2.15.0 django-filter-1.0.1 djangorestframework-3.5.4 djangorestframework-jwt-1.10.0 numpy-1.12.1 pandas-0.19.2 python-dateutil-2.6.0 pytz-2016.10
Step 1/1 : COPY . /usr/src/app
 ---> 712a54b6b923
Removing intermediate container df33c056f7c0
Removing intermediate container 4711187b3011
Removing intermediate container 6220af43bf96
Step 2/2 : CMD python ./manage.py runserver 0.0.0.0:8000
 ---> Running in 53c0cf32d840
 ---> 17c97bc704d9
Removing intermediate container 53c0cf32d840
Successfully built 17c97bc704d9

[cbb@number_api]$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
number_api_django   0.3                 17c97bc704d9        23 seconds ago      868 MB
           

這樣就成功建立了鏡像number_api_django:0.3

四、運作容器

• docker run

[cbb@number_api]$ docker run -it --rm -p 8080:8000 --name api1 number_api_django:0.3
Performing system checks...

System check identified no issues (0 silenced).
March 30, 2017 - 07:34:03
Django version 1.8, using settings 'restful.settings'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.
           

這樣就啟動了django程式。