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crawlab/docs/search_index.json
Marvin Zhang 5bca22489e updated docs
2019-06-16 22:04:16 +08:00

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虫更新、删除、创建,以及定时任务的更新、删除、创建,都会触发定时任务列表的更新。","定时任务是指定某个时刻重复性地执行的任务英文叫做period","定时任务触发","定时任务触发是比较常用的功能,对于增量抓取或对实时性有要求的任务很重要。这在定时任务中会详细介绍。","对docker不了解的开发者可以参考一下这篇文章9102","对于自定义爬虫,可以在配置标签下点击运行按钮","导航至任务详情点击结果标签点击下载csv按钮等待一会儿结果就会以csv的形式下载到本地。","导航至定时任务页面,可以看到定时任务的列表。","导航至定时任务页面,点击操作列的修改按钮,弹出修改定时任务的弹框。填写相应的内容,点击提交按钮修改定时任务。","导航至定时任务页面,点击操作列的删除按钮,确认删除该任务。","导航至需要停止的任务的任务详情,点击停止按钮来终止任务。","年了,学点","开始url","当任务运行起来之后我们因为某个原因可能需要终止任务这时我们需要在crawlab中停止该任务。","当然也可以用docker","我们已经在dockerhub上构建了crawlab的镜像开发者只需要将其pull下来使用。在pul","我们有两种运行爬虫的方式:","手动触发","执行以下命令将crawlab的镜像下载下来。镜像大小大概在几百兆因此下载需要几分钟时间。","抓取类别","拉取代码","拷贝一份后端配置文件./crawlab/config/config.py以及前端配置文件./frontend/.env.production到某一个地方。例如我的例子分别为/home/yeqing/config.py和/home/yeqing/.env.production。","接下来,我们就可以部署、运行自定义爬虫了。","操作任务","更改后端配置文件config.py将mongodb、redis的指向ip更改为自己数据的值。注意容器中对应的宿主机的ip地址不是localhost而是172.17.0.1当然也可以用network来做只是稍微麻烦一些。更改前端配置文件.env.production将api地址vue_app_base_url更改为宿主机所在的ip地址例如http://192.168.0.8:8000这将是前端调用api会用到的url。","更改好配置文件之后,接下来就是运行容器了。执行以下命令来启动容器。","更改配置文件","本使用手册会帮助您解决在安装使用crawlab遇到的任何问题。","本小节将介绍三种安装docker的方式:","本小节将介绍以下内容:","本小节将介绍如何使用crawlab包括如下内容","构建","构建完成后,会在./frontend目录下创建一个dist文件夹里面是打包好后的静态文件。","架构","查看任务","查看演示","查看节点","查看节点列表","样例","添加/etc/nginx/conf.d/crawlab.conf文件输入以下内容。","添加完成后,可以看到刚刚添加的可配置爬虫出现了在最下方,点击查看进入到爬虫详情。","添加爬虫","点击侧边栏的任务导航至任务列表。可以看到最近的10个生成的任务。可以根据节点、爬虫来过滤任务。","点击侧边栏的节点导航至节点列表可以看到已上线的节点。这里的节点其实就是已经运行起来的celeri","点击保存、预览,查看预览内容。","点击可配置爬虫。","点击操作列的查看按钮,进入到该任务的任务详情。","点击日志标签,可以查看任务日志。","点击添加定时任务,弹出创建定时任务的弹框。填写相应的内容,点击提交按钮创建定时任务。","点击结果标签,可以查看任务结果。","点击配置标签进入到配置页面。接下来,我们需要对爬虫规则进行配置。","然后在浏览器中输入http://localhost:8080就可以看到界面了。","然后crawlab会提示任务已经派发到队列中去了然后你可以在爬虫详情左侧看到新创建的任务。点击创建时间可以导航至任务详情。","然后在侧边栏点击爬虫导航至爬虫列表点击添加爬虫按钮选择自定义爬虫点击上传按钮选择刚刚打包好的zip文件。上传成功后爬虫列表中会出现新添加的自定义爬虫。这样就算添加好了。","爬虫","爬虫就是我们通常说的网络爬虫了,本小节将介绍如下内容:","爬虫最开始遍历的网址。","爬虫源代码或配置规则储存在app上需要被部署到各个worker节点中。","现在只需要启动nginx服务就完成了启动前端服务。","直接部署","直接部署是之前没有docker时的部署方式相对于docker部署来说有些繁琐。但了解如何直接部署可以帮助更深入地理解docker是如何构建crawlab镜像的。这里简单介绍一下。","知识做进一步了解。简单来说docker可以利用已存在的镜像帮助构建一些常用的服务和应用例如nginx、mongodb、redis等等。用docker运行一个mongodb服务仅需dock","结果储存在数据库中之后,我们有时候需要将其导出,这时可以在界面中进行导出操作。","统计数据","网站","网站信息是帮助用户查看站长之家收录网站的信息的包含robots协议、首页响应等信息。","自定义爬虫","自定义爬虫是指用户可以添加的任何语言任何框架的爬虫高度自定义化。当用户添加好自定义爬虫之后crawlab就可以将其集成到爬虫管理的系统中来。","自定义爬虫的添加有两种方式:","节点","节点其实就是celery中的worker。一个节点运行时会连接到一个任务队列例如redis来接收和运行任务。所有爬虫需要在运行时被部署到节点上用户在部署前需要定义节点的ip地址和端口。","节点其实就是celery中的worker。一个节点运行时会连接到一个任务队列例如redis来接收和运行任务。所有爬虫需要在运行时被部署到节点上用户在部署前需要定义节点的ip地址和端口默认为localhost:8000。","要查看统计数据的话,只需要在爬虫详情中,点击分析标签,就可以看到爬虫的统计数据了。","该模式同样会启动3个后端服务和1个前端服务。前端服务是通过npm","详情页字段","输入完基本信息,点击添加。","运行docker容器","运行爬虫","这个方式稍微有些繁琐,但是对于无法轻松获取服务器的读写权限时是非常有用的,适合在生产环境上使用。","这个默认是开启的。如果开启爬虫将先抓取网站的robots.txt并判断页面是否可抓否则不会对此进行验证。用户可以选择将其关闭。请注意任何无视robots协议的行为都有法律风险。","这也是爬虫抓取采用的策略,也就是爬虫遍历网页是如何进行的。作为第一个版本,我们有仅列表、仅详情页、列表+详情页。","这些都是再列表页或详情页中需要提取的字段。字段由css选择器或者xpath来匹配提取。可以选择文本或者属性。","这应该是部署应用的最方便也是最节省时间的方式了。在最近的一次版本更新v0.2.3中我们发布了docker功能让大家可以利用docker来轻松部署crawlab。下面将一步一步介绍如何使用docker来部署crawlab。","这是一个flask应用提供了必要的api来支持常规操作例如crud、爬虫部署以及任务运行。每一个节点需要启动flask应用来支持爬虫部署。运行python","这样的话pull镜像的速度会比不改变镜像源的速度快很多。","这样pm2会启动3个守护进程来管理这3个服务。我们如果想看后端服务的日志的话可以执行以下命令。","这样,我们就完成了节点的配置工作。","这种方式非常方便,但是需要获得主机服务器的读写权限,因而比较适合在开发环境上采用。","这里先定义了master节点也就是crawlab的主节点。master依赖于mongo和redis容器因此在启动之前会同时启动mongo和redis容器。这样就不需要单独配置mongo和redis服务了大大节省了环境配置的时间。","这里启动了多增加了两个worker节点以worker模式启动。这样多节点部署也就是分布式部署就完成了。","这里已经有一些配置好的初始输入项。我们简单介绍一下各自的含义。","这里我们选择列表+详情页。","这里是指启动后端服务。我们用pm2来管理进程。执行以下命令。","这里的cron跟linux中的crontab是一致的。如果对crontab不了解可以参考这篇文章。","这里的构建是指前端构建,需要执行以下命令。","这里的爬虫部署是指自定义爬虫的部署因为可配置爬虫已经内嵌到crawlab中了所有节点都可以使用不需要额外部署。简单来说就是将主机上的爬虫源代码通过http的方式打包传输至worker节点上因此节点就可以运行传输过来的爬虫了。","通过web界面上传","通过web界面上传爬虫","通过创建项目目录","通过添加项目目录","遵守robots协议","部署好之后,我们就可以运行爬虫了。","部署爬虫","部署爬虫很简单,有三种方式:","配置","配置爬虫","镜像之前我们需要配置一下镜像源。因为我们在墙内使用原有的镜像源速度非常感人因此将使用dockerhub在国内的加速器。创建/etc/docker/daemon.json文件在其中输入如下内容。","项目自今年三月份上线以来受到爬虫爱好者们和开发者们的好评不少使用者还表示会用crawlab搭建公司的爬虫平台。经过近3个月的迭代我们陆续上线了定时任务、数据分析、网站信息、可配置爬虫、自动提取字段、下载结果、上传爬虫等功能将crawlab打造得更加实用更加全面能够真正帮助用户解决爬虫管理困难的问题。","预览模式","预览模式是一种让用户比较快的上手的一种部署模式。跟直接部署类似但不用经过构建、nginx和启动服务的步骤。在启动时只需要执行以下命令就可以了。相较于直接部署来说方便一些。","首先是将github上的代码拉取到本地。","首先我们来看如何安装crawlab吧请查看安装。"],"pipeline":["stopWordFilter","stemmer"]},"store":{"./":{"url":"./","title":"Crawlab简介","keywords":"","body":"Crawlab\n基于Celery的爬虫分布式爬虫管理平台支持多种编程语言以及多种爬虫框架.\n查看演示 Demo\nCrawlab是基于Celery的分布式爬虫管理平台可以集成任何语言和任何框架。\n项目自今年三月份上线以来受到爬虫爱好者们和开发者们的好评不少使用者还表示会用Crawlab搭建公司的爬虫平台。经过近3个月的迭代我们陆续上线了定时任务、数据分析、网站信息、可配置爬虫、自动提取字段、下载结果、上传爬虫等功能将Crawlab打造得更加实用更加全面能够真正帮助用户解决爬虫管理困难的问题。\nCrawlab主要解决的是大量爬虫管理困难的问题例如需要监控上百个网站的参杂scrapy和selenium的项目不容易做到同时管理而且命令行管理的成本非常高还容易出错。Crawlab支持任何语言和任何框架配合任务调度、任务监控很容易做到对成规模的爬虫项目进行有效监控管理。\n本使用手册会帮助您解决在安装使用Crawlab遇到的任何问题。\n首先我们来看如何安装Crawlab吧请查看安装。\n"},"Installation/":{"url":"Installation/","title":"安装Crawlab","keywords":"","body":"本小节将介绍三种安装Docker的方式:\n\nDocker\n直接部署\n预览模式\n\n"},"Installation/Docker.html":{"url":"Installation/Docker.html","title":"Docker","keywords":"","body":"Docker安装部署\n这应该是部署应用的最方便也是最节省时间的方式了。在最近的一次版本更新v0.2.3中我们发布了Docker功能让大家可以利用Docker来轻松部署Crawlab。下面将一步一步介绍如何使用Docker来部署Crawlab。\n对Docker不了解的开发者可以参考一下这篇文章9102 年了,学点 Docker 知识做进一步了解。简单来说Docker可以利用已存在的镜像帮助构建一些常用的服务和应用例如Nginx、MongoDB、Redis等等。用Docker运行一个MongoDB服务仅需docker run -d --name mongo -p 27017:27017 mongo一行命令。如何安装Docker跟操作系统有关这里就不展开讲了需要的同学自行百度一下相关教程。\n下载镜像\n我们已经在DockerHub上构建了Crawlab的镜像开发者只需要将其pull下来使用。在pull 镜像之前我们需要配置一下镜像源。因为我们在墙内使用原有的镜像源速度非常感人因此将使用DockerHub在国内的加速器。创建/etc/docker/daemon.json文件在其中输入如下内容。\n{\n \"registry-mirrors\": [\"https://registry.docker-cn.com\"]\n}\n\n这样的话pull镜像的速度会比不改变镜像源的速度快很多。\n执行以下命令将Crawlab的镜像下载下来。镜像大小大概在几百兆因此下载需要几分钟时间。\ndocker pull tikazyq/crawlab:latest\n\n更改配置文件\n拷贝一份后端配置文件./crawlab/config/config.py以及前端配置文件./frontend/.env.production到某一个地方。例如我的例子分别为/home/yeqing/config.py和/home/yeqing/.env.production。\n更改后端配置文件config.py将MongoDB、Redis的指向IP更改为自己数据的值。注意容器中对应的宿主机的IP地址不是localhost而是172.17.0.1当然也可以用network来做只是稍微麻烦一些。更改前端配置文件.env.production将API地址VUE_APP_BASE_URL更改为宿主机所在的IP地址例如http://192.168.0.8:8000这将是前端调用API会用到的URL。\n运行Docker容器\n更改好配置文件之后接下来就是运行容器了。执行以下命令来启动容器。\ndocker run -d --rm --name crawlab \\\n -p 8080:8080 \\\n -p 8000:8000 \\\n -v /home/yeqing/.env.production:/opt/crawlab/frontend/.env.production \\\n -v /home/yeqing/config.py:/opt/crawlab/crawlab/config/config.py \\\n tikazyq/crawlab master\n\n其中我们映射了8080端口Nginx前端静态文件以及8000端口后端API到宿主机。另外还将前端配置文件/home/yeqing/.env.production和后端配置文件/home/yeqing/config.py映射到了容器相应的目录下。传入参数master是代表该启动方式为主机启动模式也就是所有服务前端、Api、Flower、Worker都会启动。另外一个模式是worker模式只会启动必要的Api和Worker服务这个对于分布式部署比较有用。等待大约20-30秒的时间来build前端静态文件之后就可以打开Crawlab界面地址地址看到界面了。界面地址默认为http://localhost:8080。\n\nDocker-Compose\n当然也可以用docker-compose的方式来部署。docker-compose是一个集群管理方式可以利用名为docker-compose.yml的yaml文件来定义需要启动的容器可以是单个也可以通常是多个的。Crawlab的docker-compose.yml定义如下。\nversion: '3.3'\nservices:\n master: \n image: tikazyq/crawlab:latest\n container_name: crawlab\n volumns:\n - /home/yeqing/config.py:/opt/crawlab/crawlab/config/config.py # 后端配置文件\n - /home/yeqing/.env.production:/opt/crawlab/frontend/.env.production # 前端配置文件\n ports: \n - \"8080:8080\" # nginx\n - \"8000:8000\" # app\n depends_on:\n - mongo\n - redis\n entrypoint:\n - /bin/sh\n - /opt/crawlab/docker_init.sh\n - master\n mongo:\n image: mongo:latest\n restart: always\n ports:\n - \"27017:27017\"\n redis:\n image: redis:latest\n restart: always\n ports:\n - \"6379:6379\"\n\n这里先定义了master节点也就是Crawlab的主节点。master依赖于mongo和redis容器因此在启动之前会同时启动mongo和redis容器。这样就不需要单独配置mongo和redis服务了大大节省了环境配置的时间。\n安装docker-compose也很简单大家去网上百度一下就可以了。\n安装完docker-compose和定义好docker-compose.yml后只需要运行以下命令就可以启动Crawlab。\ndocker-compose up\n\n同样在浏览器中输入http://localhost:8080就可以看到界面。\n多节点模式\ndocker-compose的方式很适合多节点部署在原有的master基础上增加几个worker节点达到多节点部署的目的。将docker-compose.yml更改为如下内容。\nversion: '3.3'\nservices:\n master: \n image: tikazyq/crawlab:latest\n container_name: crawlab\n volumns:\n - /home/yeqing/config.master.py:/opt/crawlab/crawlab/config/config.py # 后端配置文件\n - /home/yeqing/.env.production.master:/opt/crawlab/frontend/.env.production # 前端配置文件\n ports: \n - \"8080:8080\" # nginx\n - \"8000:8000\" # app\n depends_on:\n - mongo\n - redis\n entrypoint:\n - /bin/sh\n - /opt/crawlab/docker_init.sh\n - master\n worker1: \n image: tikazyq/crawlab:latest\n volumns:\n - /home/yeqing/config.worker.py:/opt/crawlab/crawlab/config/config.py # 后端配置文件\n - /home/yeqing/.env.production.worker:/opt/crawlab/frontend/.env.production # 前端配置文件\n ports:\n - \"8001:8000\" # app\n depends_on:\n - mongo\n - redis\n entrypoint:\n - /bin/sh\n - /opt/crawlab/docker_init.sh\n - worker\n worker2: \n image: tikazyq/crawlab:latest\n volumns:\n - /home/yeqing/config.worker.py:/opt/crawlab/crawlab/config/config.py # 后端配置文件\n - /home/yeqing/.env.production.worker:/opt/crawlab/frontend/.env.production # 前端配置文件\n ports:\n - \"8002:8000\" # app\n depends_on:\n - mongo\n - redis\n entrypoint:\n - /bin/sh\n - /opt/crawlab/docker_init.sh\n - worker\n mongo:\n image: mongo:latest\n restart: always\n ports:\n - \"27017:27017\"\n redis:\n image: redis:latest\n restart: always\n ports:\n - \"6379:6379\"\n\n这里启动了多增加了两个worker节点以worker模式启动。这样多节点部署也就是分布式部署就完成了。\n"},"Installation/Direct.html":{"url":"Installation/Direct.html","title":"直接部署","keywords":"","body":"直接部署\n直接部署是之前没有Docker时的部署方式相对于Docker部署来说有些繁琐。但了解如何直接部署可以帮助更深入地理解Docker是如何构建Crawlab镜像的。这里简单介绍一下。\n拉取代码\n首先是将github上的代码拉取到本地。\ngit clone https://github.com/tikazyq/crawlab\n\n安装\n安装前端所需库。\nnpm install -g yarn pm2\ncd frontend\nyarn install\n\n安装后端所需库。\ncd ../crawlab\npip install -r requirements\n\n配置\n分别配置前端配置文件./frontend/.env.production和后端配置文件./crawlab/config/config.py。分别需要对部署后API地址以及数据库地址进行配置。\n构建\n这里的构建是指前端构建需要执行以下命令。\ncd ../frontend\nnpm run build:prod\n\n构建完成后会在./frontend目录下创建一个dist文件夹里面是打包好后的静态文件。\nNginx\n安装nginx在ubuntu 16.04是以下命令。\nsudo apt-get install nginx\n\n添加/etc/nginx/conf.d/crawlab.conf文件输入以下内容。\nserver {\n listen 8080;\n server_name dev.crawlab.com;\n root /home/yeqing/jenkins_home/workspace/crawlab_develop/frontend/dist;\n index index.html;\n}\n其中root是静态文件的根目录这里是npm打包好后的静态文件。\n现在只需要启动nginx服务就完成了启动前端服务。\nnginx reload\n\n启动服务\n这里是指启动后端服务。我们用pm2来管理进程。执行以下命令。\npm2 start app.py # API服务\npm2 start worker.py # Worker\npm2 start flower.py # Flower\n\n这样pm2会启动3个守护进程来管理这3个服务。我们如果想看后端服务的日志的话可以执行以下命令。\npm2 logs [app]\n\n然后在浏览器中输入http://localhost:8080就可以看到界面了。\n"},"Installation/Preview.html":{"url":"Installation/Preview.html","title":"预览模式","keywords":"","body":"预览模式\n预览模式是一种让用户比较快的上手的一种部署模式。跟直接部署类似但不用经过构建、nginx和启动服务的步骤。在启动时只需要执行以下命令就可以了。相较于直接部署来说方便一些。\npython manage.py serve\n\n该模式同样会启动3个后端服务和1个前端服务。前端服务是通过npm run serve来进行的因此是开发者模式。注意强烈不建议在生产环境中用预览模式。预览模式只是让开发者快速体验Crawlab以及调试代码问题的一种方式而不是用作生产环境部署的。\n"},"Usage/":{"url":"Usage/","title":"使用Crawlab","keywords":"","body":"本小节将介绍如何使用Crawlab包括如下内容\n\n节点\n爬虫\n任务\n定时任务\n\n"},"Usage/Node/":{"url":"Usage/Node/","title":"节点","keywords":"","body":"节点\n节点其实就是Celery中的Worker。一个节点运行时会连接到一个任务队列例如Redis来接收和运行任务。所有爬虫需要在运行时被部署到节点上用户在部署前需要定义节点的IP地址和端口默认为localhost:8000。\n\n查看节点\n修改节点信息\n\n"},"Usage/Node/View.html":{"url":"Usage/Node/View.html","title":"查看节点列表","keywords":"","body":"查看节点列表\n点击侧边栏的节点导航至节点列表可以看到已上线的节点。这里的节点其实就是已经运行起来的celery worker他们通过连接到配置好的broker通常是redis来进行与主机的通信。\n\n"},"Usage/Node/Edit.html":{"url":"Usage/Node/Edit.html","title":"修改节点信息","keywords":"","body":"修改节点信息\n后面我们需要让爬虫运行在各个节点上需要让主机与节点进行通信因此需要知道节点的IP地址和端口。我们需要手动配置一下节点的IP和端口。在节点列表中点击操作列里的蓝色查看按钮进入到节点详情。节点详情样子如下。\n\n在右侧分别输入该节点对应的节点IP和节点端口然后点击保存按钮保存该节点信息。\n这样我们就完成了节点的配置工作。\n"},"Usage/Spider/":{"url":"Usage/Spider/","title":"爬虫","keywords":"","body":"爬虫\n爬虫就是我们通常说的网络爬虫了本小节将介绍如下内容\n\n创建爬虫\n部署爬虫\n运行爬虫\n可配置爬虫\n统计数据\n\n"},"Usage/Spider/Create.html":{"url":"Usage/Spider/Create.html","title":"创建爬虫","keywords":"","body":"创建爬虫\nCrawlab允许用户创建两种爬虫\n\n自定义爬虫\n可配置爬虫\n\n前者可以通过Web界面和创建项目目录的方式来添加后者由于没有源代码只能通过Web界面来添加。\n"},"Usage/Spider/CustomizedSpider.html":{"url":"Usage/Spider/CustomizedSpider.html","title":"自定义爬虫","keywords":"","body":"自定义爬虫\n自定义爬虫是指用户可以添加的任何语言任何框架的爬虫高度自定义化。当用户添加好自定义爬虫之后Crawlab就可以将其集成到爬虫管理的系统中来。\n自定义爬虫的添加有两种方式\n\n通过Web界面上传爬虫\n通过创建项目目录\n\n通过Web界面上传\n在通过Web界面上传之前需要将爬虫项目文件打包成zip格式。\n\n然后在侧边栏点击爬虫导航至爬虫列表点击添加爬虫按钮选择自定义爬虫点击上传按钮选择刚刚打包好的zip文件。上传成功后爬虫列表中会出现新添加的自定义爬虫。这样就算添加好了。\n这个方式稍微有些繁琐但是对于无法轻松获取服务器的读写权限时是非常有用的适合在生产环境上使用。\n通过添加项目目录\nCrawlab会自动发现PROJECT_SOURCE_FILE_FOLDER目录下的所有爬虫目录并将这些目录生成自定义爬虫并集成到Crawlab中。因此将爬虫项目目录拷贝到PROJECT_SOURCE_FILE_FOLDER目录下就可以添加一个爬虫了。\n这种方式非常方便但是需要获得主机服务器的读写权限因而比较适合在开发环境上采用。\n配置爬虫\n在定义爬虫中我们需要配置一下执行命令运行爬虫时后台执行的shell命令和结果集通过CRAWLAB_COLLECTION传递给爬虫程序爬虫程序存储结果的地方然后点击保存按钮保存爬虫信息。\n\n接下来我们就可以部署、运行自定义爬虫了。\n"},"Usage/Spider/ConfigurableSpider.html":{"url":"Usage/Spider/ConfigurableSpider.html","title":"可配置爬虫","keywords":"","body":"可配置爬虫\n可配置爬虫是版本v0.2.1开发的功能。目的是将具有相似网站结构的爬虫项目可配置化,将开发爬虫的过程流程化,大大提高爬虫开发效率。\nCrawlab的可配置爬虫是基于Scrapy的因此天生支持并发。而且可配置爬虫完全支持自定义爬虫的一般功能因此也支持任务调度、任务监控、日志监控、数据分析。\n添加爬虫\n在侧边栏点击爬虫导航至爬虫列表点击添加爬虫按钮。\n\n点击可配置爬虫。\n\n输入完基本信息点击添加。\n\n配置爬虫\n添加完成后可以看到刚刚添加的可配置爬虫出现了在最下方点击查看进入到爬虫详情。\n\n点击配置标签进入到配置页面。接下来我们需要对爬虫规则进行配置。\n\n这里已经有一些配置好的初始输入项。我们简单介绍一下各自的含义。\n抓取类别\n这也是爬虫抓取采用的策略也就是爬虫遍历网页是如何进行的。作为第一个版本我们有仅列表、仅详情页、列表+详情页。\n\n仅列表页。这也是最简单的形式爬虫遍历列表上的列表项将数据抓取下来。\n仅详情页。爬虫只抓取详情页。\n列表+详情页。爬虫先遍历列表页,将列表项中的详情页地址提取出来并跟进抓取详情页。\n\n这里我们选择列表+详情页。\n列表项选择器 & 分页选择器\n列表项的匹和分页按钮的匹配查询由CSS或XPath来进行匹配。\n开始URL\n爬虫最开始遍历的网址。\n遵守Robots协议\n这个默认是开启的。如果开启爬虫将先抓取网站的robots.txt并判断页面是否可抓否则不会对此进行验证。用户可以选择将其关闭。请注意任何无视Robots协议的行为都有法律风险。\n列表页字段 & 详情页字段\n这些都是再列表页或详情页中需要提取的字段。字段由CSS选择器或者XPath来匹配提取。可以选择文本或者属性。\n在检查完目标网页的元素CSS选择器之后我们输入列表项选择器、开始URL、列表页/详情页等信息。注意勾选url为详情页URL。\n\n点击保存、预览查看预览内容。\n\n"},"Usage/Spider/Deploy.html":{"url":"Usage/Spider/Deploy.html","title":"部署爬虫","keywords":"","body":"部署爬虫\n这里的爬虫部署是指自定义爬虫的部署因为可配置爬虫已经内嵌到Crawlab中了所有节点都可以使用不需要额外部署。简单来说就是将主机上的爬虫源代码通过HTTP的方式打包传输至worker节点上因此节点就可以运行传输过来的爬虫了。\n部署爬虫很简单有三种方式\n\n在爬虫列表中点击部署所有爬虫将所有爬虫部署到所有在线节点中\n在爬虫列表中点击操作列的部署按钮将指定爬虫部署到所有在线节点中\n在爬虫详情的概览标签中点击部署按钮将指定爬虫部署到所有在线节点中。\n\n部署好之后我们就可以运行爬虫了。\n"},"Usage/Spider/Run.html":{"url":"Usage/Spider/Run.html","title":"运行爬虫","keywords":"","body":"运行爬虫\n我们有两种运行爬虫的方式\n\n手动触发\n定时任务触发\n\n手动触发\n\n在爬虫列表中操作列点击运行按钮或者\n在爬虫详情中概览标签下点击运行按钮或者\n对于自定义爬虫可以在配置标签下点击运行按钮\n\n然后Crawlab会提示任务已经派发到队列中去了然后你可以在爬虫详情左侧看到新创建的任务。点击创建时间可以导航至任务详情。\n定时任务触发\n定时任务触发是比较常用的功能对于增量抓取或对实时性有要求的任务很重要。这在定时任务中会详细介绍。\n"},"Usage/Spider/Analytics.html":{"url":"Usage/Spider/Analytics.html","title":"统计数据","keywords":"","body":"统计数据\n在运行了一段时间之后爬虫会积累一些统计数据例如运行成功率、任务数、运行时长等指标。Crawlab将这些指标汇总并呈现给开发者。\n要查看统计数据的话只需要在爬虫详情中点击分析标签就可以看到爬虫的统计数据了。\n\n"},"Usage/Task/":{"url":"Usage/Task/","title":"任务","keywords":"","body":"任务\n任务其实就是指某一次抓取任务或采集任务。任务与爬虫关联其执行的也是爬虫指定的执行命令或采集规则。抓取或采集的结果与任务关联因此可以查看到每一次任务的结果集。Crawlab的任务是整个采集流程的核心抓取的过程都是跟任务关联起来的因此任务对于Crawlab来说非常重要。任务被app触发worker通过任务队列接收任务然后在其所在节点上执行任务。\n本小节将介绍以下内容\n\n查看任务\n操作任务\n下载结果\n\n"},"Usage/Task/View.html":{"url":"Usage/Task/View.html","title":"查看任务","keywords":"","body":"查看任务\n任务列表\n点击侧边栏的任务导航至任务列表。可以看到最近的10个生成的任务。可以根据节点、爬虫来过滤任务。\n\n点击操作列的查看按钮进入到该任务的任务详情。\n任务日志\n点击日志标签可以查看任务日志。\n\n任务结果\n点击结果标签可以查看任务结果。\n\n"},"Usage/Task/Action.html":{"url":"Usage/Task/Action.html","title":"操作任务","keywords":"","body":"操作任务\n停止任务\n当任务运行起来之后我们因为某个原因可能需要终止任务这时我们需要在Crawlab中停止该任务。\n导航至需要停止的任务的任务详情点击停止按钮来终止任务。\n删除任务\n在任务列表中点击操作列中的删除按钮确认删除该任务。\n"},"Usage/Task/DownloadResults.html":{"url":"Usage/Task/DownloadResults.html","title":"下载结果","keywords":"","body":"下载结果\n结果储存在数据库中之后我们有时候需要将其导出这时可以在界面中进行导出操作。\n导航至任务详情点击结果标签点击下载CSV按钮等待一会儿结果就会以CSV的形式下载到本地。\n"},"Usage/Schedule/":{"url":"Usage/Schedule/","title":"定时任务","keywords":"","body":"定时任务\n定时任务是指定某个时刻重复性地执行的任务英文叫做Periodical Tasks在Linux中也被称为Crontab。定时任务可以让任务可以被执行多次而用户则不用手动的操作来执行任务。在生产环境中这非常常见。定时任务对于对增量抓取或对数据实时性有要求的用户来说非常有用。\n在Crawlab中定时任务是通过apscheduler来实现的。创建一个定时任务之后会在名为mongo的jobstore中创建一个periodical jobapscheduler调度引擎将会不断的去数据库中匹配任务的执行时间如果执行时间满足要求则会在后台触发一次任务运行。\n定时任务列表会进行更新。每一次爬虫更新、删除、创建以及定时任务的更新、删除、创建都会触发定时任务列表的更新。\n创建定时任务\n导航至定时任务页面可以看到定时任务的列表。\n点击添加定时任务弹出创建定时任务的弹框。填写相应的内容点击提交按钮创建定时任务。\n\n这里的Cron跟Linux中的crontab是一致的。如果对crontab不了解可以参考这篇文章。\n修改定时任务\n导航至定时任务页面点击操作列的修改按钮弹出修改定时任务的弹框。填写相应的内容点击提交按钮修改定时任务。\n删除定时任务\n导航至定时任务页面点击操作列的删除按钮确认删除该任务。\n"},"Usage/Site/":{"url":"Usage/Site/","title":"网站","keywords":"","body":"网站\n网站信息是帮助用户查看站长之家收录网站的信息的包含Robots协议、首页响应等信息。\n\n"},"Architecture/":{"url":"Architecture/","title":"架构","keywords":"","body":"架构\nCrawlab的架构跟Celery非常相似但是加入了包括前端、爬虫、Flower在内的额外模块以支持爬虫管理的功能。架构图如下。\n\n节点 Node\n节点其实就是Celery中的worker。一个节点运行时会连接到一个任务队列例如Redis来接收和运行任务。所有爬虫需要在运行时被部署到节点上用户在部署前需要定义节点的IP地址和端口。\n后台应用 Backend App\n这是一个Flask应用提供了必要的API来支持常规操作例如CRUD、爬虫部署以及任务运行。每一个节点需要启动Flask应用来支持爬虫部署。运行python app.py来启动应用。\n爬虫 Spider\n爬虫源代码或配置规则储存在App上需要被部署到各个worker节点中。\n任务 Task\n任务被触发并被节点执行。用户可以在任务详情页面中看到任务到状态、日志和抓取结果。\n中间者 Broker\n中间者跟Celery中定义的一样作为运行异步任务的队列。\n前端 Frontend\n前端其实就是一个基于Vue-Element-Admin的单页应用。其中重用了很多Element-UI的控件来支持相应的展示。\nFlower\n一个Celery的插件用于监控Celery节点。\n"},"Examples/":{"url":"Examples/","title":"样例","keywords":"","body":"样例\n\n与Scrapy集成\n\n"},"Examples/ScrapyIntegration.html":{"url":"Examples/ScrapyIntegration.html","title":"与Scrapy集成","keywords":"","body":"与Scrapy集成\n以下是Crawlab跟Scrapy集成的例子利用了Crawlab传过来的task_id和collection_name。\nimport os\nfrom pymongo import MongoClient\n\nMONGO_HOST = '192.168.99.100'\nMONGO_PORT = 27017\nMONGO_DB = 'crawlab_test'\n\n# scrapy example in the pipeline\nclass JuejinPipeline(object):\n mongo = MongoClient(host=MONGO_HOST, port=MONGO_PORT)\n db = mongo[MONGO_DB]\n col_name = os.environ.get('CRAWLAB_COLLECTION')\n if not col_name:\n col_name = 'test'\n col = db[col_name]\n\n def process_item(self, item, spider):\n item['task_id'] = os.environ.get('CRAWLAB_TASK_ID')\n self.col.save(item)\n return item\n\n"}}}