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+使用docker快速组成样品机
+========================================
+
+在写前，我们将看看 Node.js 样机 ** 找寻树莓派 PI Zero ** 的供应在英国三个主要销售.
+
+我写的代码，黑客部署到 Azure Ubuntu 虚拟机一个晚上就可以到位。Docker 和 docker-compose 工具做出调配和更新过程非常快。
+
+### 建立链接？
+
+
+如果您已经通过 [动手 Docker 教程指南] [1] 那么你已有在命令行建立 Docker 容器的经验。链接一个Redis 服务器计数器节点在命令行上可能是这样：
+
+```
+$ docker run -d -P --name redis1
+$ docker run -d hit_counter -p 3000:3000 --link redis1:redis
+```
+
+现在，假设应用程序中有三个等级
+
+- Web 前端
+- 批次层处理长时间运行的任务
+- Redis 或 MongoDB 数据库
+
+通过 `--link` 管理几个容器，但可能失效，可以添加多层级或容器到应用程序。
+
+### 键入 docker 撰写
+
+![](http://blog.alexellis.io/content/images/2016/05/docker-compose-logo-01.png)
+>Docker 撰写图标
+
+docker-compose 工具是标准的 docker工具箱的一部分，也可以单独下载。它提供了丰富功能，通过一个纯文本YAML文件配置所有应用程序组件。
+
+上述提供了一个例子：
+
+```
+version: "2.0"  
+services:  
+  redis1:
+    image: redis
+  hit_counter:
+    build: ./hit_counter
+    ports:
+     - 3000:3000
+```
+
+从Docker 1.10起，我们可以充分利用网络来帮助我们在多个主机进行扩展覆盖。在此之前，仅通过单个主机工作。“docker-compose scale” 命令可用于更多计算能力有需要时。
+
+>参考docker.com上关于"docker-compose"
+
+### 真实例子：树莓派 PI 到货通知
+
+![](http://blog.alexellis.io/content/images/2016/05/Raspberry_Pi_Zero_ver_1-3_1_of_3_large.JPG)
+>新版树莓派 PI Zero V1.3 图片提供来自Pimoroni
+
+树莓派 PI Zero - 巨大的轰动一个微型计算机具有一个1GHz 处理器 和 512MB 内存能够运行完整 Linux，Docker，Node.js，Ruby 和许多流行的开源工具。一个关于 PI Zero 的好消息是，成本只有5美元。这也意味着，存量迅速抢购一空。
+
+*如果您想尝试Docker 或集群在PI看看下面的教程。*
+
+>[Docker Swarm on the PI Zero][3]
+
+### Original site: whereismypizero.com
+
+I found a webpage which used screen scraping to find whether 4-5 of the most popular outlets had stock.
+
+- The site contained a static HTML page
+- Issued one XMLHttpRequest per outlet accessing /public/api/
+- The server issued the HTTP request to each shop and performed the scraping
+
+Every call to /public/api/ took 3 seconds to execute and using Apache Bench (ab) I was only able to get through 0.25 requests per second.
+
+### Reinventing the wheel
+
+The retailers didn't seem to mind whereismypizero.com scraping their sites for stock, so I set about writing a similar tool from the ground up. I had the intention of handing a much higher amount of requests per second through caching and de-coupling the scrape from the web tier. Redis was the perfect tool for the job. It allowed me to set an automatically expiring key/value pair (i.e. a simple cache) and also to transmit messages between Node processes through pub/sub.
+
+>Fork or star the code on Github: [alexellis/pi_zero_stock][4]
+
+If you've worked with Node.js before then you will know it is single-threaded and that any CPU intensive tasks such as parsing HTML or JSON could lead to a slow-down. One way to mitigate that is to use a second worker process and a Redis messaging channel as connective tissue between this and the web tier.
+
+- Web tier
+  -Gives 200 for cache hit (Redis key exists for store)
+  -Gives 202 for cache miss (Redis key doesn't exist, so issues message)
+  -Since we are only ever reading a Redis key the response time is very quick.
+- Stock Fetcher
+  -Performs HTTP request
+  -Scrapes for different types of web stores
+  -Updates a Redis key with a cache expire of 60 seconds
+  -Also locks a Redis key to prevent too many in-flight HTTP requests to the web stores.
+```
+version: "2.0"  
+services:  
+  web:
+    build: ./web/
+    ports:
+     - "3000:3000"
+  stock_fetch:
+    build: ./stock_fetch/
+  redis:
+    image: redis
+```
+
+*The docker-compose.yml file from the example.*
+
+Once I had this working locally deploying to an Ubuntu 16.04 image in the cloud (Azure) took less than 5 minutes. I logged in, cloned the repository and typed in `docker compose up -d`. That was all it took - rapid prototyping a whole system doesn't get much better. Anyone (including the owner of whereismypizero.com) can deploy the new solution with just two lines:
+
+```
+$ git clone https://github.com/alexellis/pi_zero_stock
+$ docker-compose up -d
+```
+
+Updating the site is easy and just involves a `git pull` followed by a `docker-compose up -d` with the `--build` argument passed along.
+
+If you are still linking your Docker containers manually, try Docker Compose for yourself or my code below:
+
+>Fork or star the code on Github: [alexellis/pi_zero_stock][5]
+
+### Check out the test site
+
+The test site is currently deployed now using docker-compose.
+
+>[stockalert.alexellis.io][6]
+
+![](http://blog.alexellis.io/content/images/2016/05/Screen-Shot-2016-05-16-at-22-34-26-1.png)
+
+Preview as of 16th of May 2016
+
+----------
+via: http://blog.alexellis.io/rapid-prototype-docker-compose/
+
+作者：[Alex Ellis][a]
+译者：[erlinux](https://github.com/erlinux)
+校对：[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]: http://blog.alexellis.io/author/alex/
+[1]: http://blog.alexellis.io/handsondocker
+[2]: https://docs.docker.com/compose/compose-file/
+[3]: http://blog.alexellis.io/dockerswarm-pizero/
+[4]: https://github.com/alexellis/pi_zero_stock
+[5]: https://github.com/alexellis/pi_zero_stock
+[6]: http://stockalert.alexellis.io/