Docker 搭建一个Docker应用栈

Docker应用栈结构图

Build Django容器

编写docker-file

FROM django
RUN pip install redis

build django-with-redis image

root@swarm-manager:~# docker build -t django-with-redis .
Sending build context to Docker daemon  223.7kB
Step 1/2 : FROM django
 ---> eb40dcf64078
Step 2/2 : RUN pip install redis
 ---> Running in 61fb045c3277
Collecting redis
  Downloading redis-2.10.6-py2.py3-none-any.whl (64kB)
Installing collected packages: redis
Successfully installed redis-2.10.6
You are using pip version 9.0.1, however version 9.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Removing intermediate container 61fb045c3277
 ---> 60c26592c8e5
Successfully built 60c26592c8e5
Successfully tagged django-with-redis:latest

启动容器

启用Redis一个master和两个slave
# docker run -itd --name redis-master redis
# docker run -itd --name redis-slave1 --link redis-master:master redis
# docker run -itd --name redis-slave2 --link redis-master:master redis

启动Django
# docker run -itd --name app1 --link redis-master:db -v ~/Projects/Django/app1:/usr/src/app django-with-redis
# docker run -itd --name app2 --link redis-master:db -v ~/Projects/Django/app2:/usr/src/app django-with-redis

启动HAproxy
# docker run -itd --name HAproxy --link app1:app1 --link app2:app2 -p 8080:8080 -v ~/Projects/HAproxy:/usr/local/sbin haproxy

配置Redis

Redis-Master配置文件, 任意redis兼容的配置文件, 修改以下两个参数

daemonize yes
pidfile /var/run/redis.pid

Redis-Slave配置文件，任意redis兼容的配置文件，修改以下三个参数

daemonize yes
pidfile /var/run/redis.pid
slaveof master 6379

将配置文件复制到Redis中,并启动Redis服务

# docker cp redis.conf redis-master:/usr/local/bin
# docker exec -it redis-master /bin/bash
# cd /usr/local/bin
# redis-server redis.conf

Redis主从测试-Master测试

root@93cf64cdeedd:/data# redis-cli 
127.0.0.1:6379> set hello world
OK
127.0.0.1:6379> get hello
"world"
127.0.0.1:6379> 

Redis主从测试-Slave测试

root@c84e012871ae:/data# redis-cli 
127.0.0.1:6379> get hello
"world"
127.0.0.1:6379> 

配置Django

在Django容器中，生成Django项目文件

# cd /usr/src/app
# mkdir dockerweb
# django-admin startproject redisweb
# cd redisweb
# python manage.py startapp helloworld

在Docker宿主机修改Django配置文件

root@swarm-manager:~/Projects/Django/App1/dockerweb/redisweb/helloworld# ls
admin.py  apps.py  __init__.py  migrations  models.py  __pycache__  tests.py  views.py

修改views.py

from django.shortcuts import render
from django.http import HttpResponse
# Create your views here.

import redis

def hello(request):
    str = redis.__file__
    str += "<br>"
    r = redis.Redis(host="db", port=6379, db=0)
    info = r.info()
    str += ("Set Hi <br>")
    r.set("Hi", "HelloWorld-App1")
    str += ("Get Hi: %s <br>" % r.get("Hi"))
    str += ("Redis Info: <br>")
    str += ("Key: Info Value")
    for key in info:
      str += ("%s: %s <br>" % (key, info[key]))
    return HttpResponse(str)

修改settings.py

ALLOWED_HOSTS = ["*",]


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'helloworld'
]

修改url.py

from django.conf.urls import url
from django.contrib import admin
from helloworld.views import hello

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'helloworld$', hello),
]

进入Django容器完成项目生成

# python manage.py makemigrations
# python manage.py migrate

启动Django

# python manage.py runserver 0.0.0.0:8000 &

配置HAProxy

创建配置文件

global
  log 127.0.0.1   local0
  maxconn 4096
  chroot /usr/local/sbin
  daemon
  nbproc 4
  pidfile /usr/local/sbin/haproxy.pid

defaults
  log 127.0.0.1   local3
  mode http
  option dontlognull
  option redispatch
  retries 2
  maxconn 2000
  balance roundrobin
  
  timeout connect 5000ms
  timeout client 50000ms
  timeout server 50000ms

listen redis_proxy 
  bind 0.0.0.0:6301
  stats enable
  stats uri /haproxy-stats
    server app1 app1:8000 check inter 2000 rise 2 fall 5
    server app2 app2:8000 check inter 2000 rise 2 fall 5

启动HAproxy

# cd /usr/local/sbin
# haproxy -f haproxy.cfg

验证