scrapy 部署

下面简单介绍两种部署的方式，crontab定时任务+日志，第二种则是scrapyd+spiderkeeper,更推荐后者，图形界面的方式，管理方便，清晰。

scrapy 开发调试

　　1、在spiders同目录下新建一个run.py文件，内容如下（列表里面最后可以加上参数，如--nolog）

　　2、下面命令只限于，快速调试的作用或一个项目下单个spider的爬行任务。

from scrapy.cmdline import execute
execute(['scrapy','crawl','app1'])

多爬虫并发：

　　1、在spiders同级创建任意目录，如：commands

　　2、在其中创建 crawlall.py 文件 （此处文件名就是自定义的命令）

　　

crawlall.py

from scrapy.commands import ScrapyCommand
from scrapy.crawler import CrawlerRunner
from scrapy.exceptions import UsageError
from scrapy.utils.conf import arglist_to_dict
 
 
class Command(ScrapyCommand):
    requires_project = True
 
    def syntax(self):
        return '[options]'
 
    def short_desc(self):
        return 'Runs all of the spiders'
 
    def add_options(self, parser):
        ScrapyCommand.add_options(self, parser)
        parser.add_option("-a", dest="spargs", action="append", default=[], metavar="NAME=VALUE",
                          help="set spider argument (may be repeated)")
        parser.add_option("-o", "--output", metavar="FILE",
                          help="dump scraped items into FILE (use - for stdout)")
        parser.add_option("-t", "--output-format", metavar="FORMAT",
                          help="format to use for dumping items with -o")
 
    def process_options(self, args, opts):
        ScrapyCommand.process_options(self, args, opts)
        try:
            opts.spargs = arglist_to_dict(opts.spargs)
        except ValueError:
            raise UsageError("Invalid -a value, use -a NAME=VALUE", print_help=False)
 
    def run(self, args, opts):
        # settings = get_project_settings()
 
        spider_loader = self.crawler_process.spider_loader
        for spidername in args or spider_loader.list():
            print("*********cralall NewsSpider************")
            self.crawler_process.crawl(spidername, **opts.spargs)
        self.crawler_process.start()

　　3、到这里还没完，settings.py配置文件还需要加一条。

COMMANDS_MODULE = ‘项目名称.目录名称’　

COMMANDS_MODULE = 'NewSpider.commands'

　　4、执行命令

$ scrapy crawlall

　　5、 日志输出，

# 保存log信息的文件名
LOG_FILE = "myspider.log"
LOG_LEVEL = "INFO"

scrapyd+spiderkeeper

1.安装 

$ pip install scrapyd

$ pip install scrapyd-client

$ pip install spiderkeeper

2.配置

配置scrapy.cfg文件，取消注释url

[settings]
default = project.settings

[deploy:project_deploy]
url = http://localhost:6800/
project = project

username = root
password = password

scrapyd-deploy在linux和mac下可运行，windows下需在python/scripts路径下新建scrapyd-deploy.bat,注意了,下面python路径以及scrapyd-deploy路径需要修改

@echo off

"C:\Users\CZN\scrapyVir\Scripts\python.exe" "C:\Users\CZN\scrapyVir\Scripts\scrapyd-deploy" %1 %2 %3 %4 %5 %6 %7 %8 %9

cmd下进入scrapy项目根目录，

1）敲入scrapyd-deploy -l

project http://localhost:6800/

2）敲入scrapy list    显示 spider 列表

LOG_STDOUT = True # 大坑，导致scrapy list 失效

3）scrapyd  #在scrapy.cfg同路径下启动scrapyd服务器 端口6800

4）spiderkeeper  --server=http://localhost:6800 --username=root --password=password #启动spiderkeep 端口5000

5）scrapyd-deploy project_deploy -p project  #发布工程到scrapyd

成功返回json数据

6）scrapyd-deploy --build-egg output.egg #生成output.egg文件

7）spiderkeep图形界面上传output.egg即可

部署完成，设置定时爬取任务或启动单个spider

settings.py 几个具有普适性配置

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

CONCURRENT_REQUESTS = 32
DOWNLOAD_DELAY = 0.1
DOWNLOAD_TIMEOUT = 10
RETRY_TIMES = 5
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16
COOKIES_ENABLED = False