scrapy docker 基本部署使用

1. 简单项目
pip install scrapy 
scrapy startproject appdemo
 
 
2. 项目代码
a. 项目代码结构

├── Dockerfile
├── README.md
├── appdemo
│   ├── __init__.py
│   ├── __pycache__
│   ├── items.py
│   ├── middlewares.py
│   ├── pipelines.py
│   ├── settings.py
│   └── spiders
│       ├── __init__.py
│       ├── __pycache__
│       └── book_spider.py
└── scrapy.cfg

b. 主要代码是book_spider.py

import scrapy
class BookSpider(scrapy.Spider):
    name="appdemo"
    start_urls=["http://books.toscrape.com/"]
    def parse(self,response):
        for book in response.css("article.product_pod"):
            name= book.xpath("./h3/a/@title").extract_first()
            price=book.css("p.price_color::text").extract_first()
            yield {
                "name":name,
                "price":price,
            }
            next_url=response.css("ul.pager li.next a::attr(href)").extract_first()
            if next_url:
                next_url=response.urljoin(next_url)
                yield scrapy.Request(next_url,callback=self.parse)
c. Dockerfile

FROM python:3.5
RUN  pip install scrapy
VOLUME [ "/data" ]
WORKDIR /myapp
COPY . /myapp
ENTRYPOINT [ "scrapy","crawl","appdemo","-o","/data/appdemo.csv" ]
备注： 为了简单使用了python:3.5 基础镜像，alpine 镜像存在包依赖的问题
 
3. 运行
a. 命令行运行

scrapy crawl appdemo -o myinfo.csv

b. docker build

docker build -t myscrapy .

docker run -it -v $PWD/mydata:/data myscrapy
cat $PWD/mydata/appdemo.csv

c. 直接使用dockerhub 镜像运行
docker run -it -v $PWD/mydata:/data dalongrong/scrapydockerdemo
docker
 
4. 参考文档
https://docs.scrapy.org/en/latest/
https://github.com/rongfengliang/scrapydockerdemo
 
 
 
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