A web-crawler (also known as a web-spider) traverses the webpages of the internet by following the links of urls contained within each webpage. There is usually an initial seed of URLs from which the crawler is given to initialize its crawl.

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25
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4answers
6k views

Does a company have implied right to crawl my website?

I have found out that McAfee SiteAdvisor has reported my website as "may be having security issues". I care little about whatever McAfee thinks of my website (I can secure it myself and if not, ...
8
votes
5answers
7k views

How are these 'bad bots' finding my closed webserver?

I've installed Apache a while ago, and a quick look at my access.log shows that all sorts of unknown IPs are connecting, mostly with a status code 403, 404, 400, 408. I have no idea how they're ...
7
votes
8answers
3k views

How can I tell how often Google crawls my site?

I've started a relatively new website, and I submitted it to google and everything. I use google's webmaster tools as well. I'm wondering how to figure out the frequency of google's spider accessing ...
5
votes
3answers
2k views

How do I use robots.txt to disallow crawling for only my subdomains?

If I want my main website to on search engines, but none of the subdomains to be, should I just put the "disallow all" robots.txt in the directories of the subdomains? If I do, will my main domain ...
4
votes
3answers
215 views

How often does Google's web spiders crawl the web?

Just a few hours after having made some changes in the HTML of my site, I found that Google had updated its search result against my website. The Internet is so huge, how did the Google crawler do ...
4
votes
4answers
993 views

How i can run nutch on linux kernel?

I want to run nutch on the linux kernel,I have loged in as a root user, I have setted all the environment variable and nutch file setting. I have created a url.txt file which content the url to ...
4
votes
3answers
1k views

Search Engine for Network Shares

We have a clustered storage server that contains many project files like Corel, Indesign, Edius, Adobe Premiere, etc.. Also it has lots of image, audio and video files. We are using sharepoint and ...
4
votes
1answer
737 views

Site crawler/spider that tosses results into mysql

It's been suggested that we use mysql for our site's search as it'd be running on the same server that hosts our web server (nginx) and our db (mysql). Since not all of our pages are created from the ...
3
votes
3answers
442 views

Does google's web crawler download binary files?

My Google-fu is failing me right now. I'm trying to figure out whether Google's web crawler downloads non-image binary files when it spiders sites. I know it downloads (and indexes) images and PDFs, ...
3
votes
1answer
112 views

Why is googlebot requesting robots.txt from my SSH server?

I run ossec on my server and periodically I receive a warning like this: Received From: myserver->/var/log/auth.log Rule: 5701 fired (level 8) -> "Possible attack on the ssh server (or version ...
2
votes
1answer
713 views

Strange request in access.log, how to block?

I am using nginx on my own server, and I noticed a few days ago some strange request in my access.log : 77.50.217.37 - - [19/Aug/2011:17:50:50 +0200] "GET http://images.google.com/ HTTP/1.1" 200 151 ...
2
votes
4answers
6k views

Finding all IP ranges belonging to a specific ISP

I'm having an issue with a certain individual who keeps scraping my site in an aggressive manner; wasting bandwidth and CPU resources. I've already implemented a system which tails my web server ...
2
votes
1answer
282 views

Are there any regularly updated Bot/Spider/Crawler Databases?

I am looking for a database that is regularly updated of different bots, spiders, and crawlers. I want to be able to identify them in the log files from IIS.
2
votes
1answer
205 views

Ethical/legal considerations when redirecting

A webcrawler has bought our site down twice. It ignores our robots.txt and we have had no reply from their customer services or support using both e-mail and twitter. I have had to create url ...
2
votes
2answers
2k views

Apache crashing with memory/cpu overload when google crawler visits site

I have a site with low traffic, less than 500 hits a day. It has a 6G of memory and it is way underutilized, on average 5% is in use. But as soon as googlebot establishes a connection to my ...
2
votes
3answers
273 views

How much HDD space would I need to cache the web while respecting robot.txts? [closed]

I want to experiment with creating a web crawler. I'll start with indexing a few medium sized website like Stack Overflow or Smashing Magazine. If it works, I'd like to start crawling the entire web. ...
2
votes
3answers
426 views

Firewall - Preventing Content Theft & Rogue Crawlers

Our websites are being crawled by content thieves on a regular basis. We obviously want to let through the nice bots and legitimate user activity, but block questionable activity. We have tried IP ...
2
votes
2answers
65 views

Strange “GET /api/levels/ ” and “GET /play/” requests in logs

I've setup new Amazon EC2 instance. In a day or two started to get strange "GET" requests from the "google bot-like" IP's (eg 66.249.76.84, 66.249.74.152) about one in 10 seconds (some examples): ...
1
vote
1answer
1k views

How big would a MySQL database be if I save all webpages' title and URL in it? [closed]

For learning purposes, I want to make a simple web indexer which crawls the web and saves all found pages in a MySQL database with their titles and URLs, with this table (the page's content is not ...
1
vote
3answers
428 views

Should I ban spiders?

A rails template script that I've been looking at automatically adds User-Agent: and Dissalow: in robots.txt thereby banning all spiders from the site What are the benefits of banning spiders and why ...
1
vote
2answers
713 views

How to create a global robots.txt that gets appended to each domain's own robots.txt on Apache?

I know can create ONE robots.txt file for all domains on an Apache server*, but I want to append to each domain's (if pre-existing) robots.txt. I want some general rules in place for all domains, but ...
1
vote
3answers
2k views

How to block this URL pattern in Varnish VCL?

My website is getting badly hit by spambots and scrappers. I've used Cloudflare but the problem still remains there. The problem is spambots accessing non-existing urls causing a lot of load to my ...
1
vote
2answers
2k views

Copy a website and preserve the file & folder structure

I have an old web site running on an ancient version of Oracle Portal that we need to convert to a flat-html structure. Due to damage to the server we are not able to access the administrative ...
1
vote
3answers
933 views

Is it worthwhile to block malicious crawlers via iptables?

I periodically check my server logs and I notice a lot of crawlers search for the location of phpmyadmin, zencart, roundcube, administrator sections and other sensitive data. Then there are also ...
1
vote
1answer
246 views

Does a forward web proxy exist that checks and obeys robots.txt on remote domains?

Does there exist a forward proxy server that will lookup and obey robots.txt files on remote internet domains and enforce them on behalf of requesters going via the proxy? e.g. Imagine a website at ...
1
vote
1answer
139 views

Googlebot repeatedly looks for files that aren't on my server

I'm hosting a site for a volunteer organization. I've moved the site to WordPress, but it wasn't always that way. I suspect at one point it was hacked badly. My Apache error log file has grown to ...
1
vote
3answers
4k views

Blocking 'good' bots in nginx with multiple conditions for certain off-limits URL's where humans can go

After 2 days of searching/trying/failing I decided to post this here, I haven't found any example of someone doing the same nor what I tried seems to be working OK. I'm trying to send a 403 to bots ...
1
vote
0answers
27 views

What are the symptoms of an overloaded webserver

I'm maintaining some web crawlers. I want to improve our load/throttling system to be more intelligent. Of cause I look at response codes, and throttle up or down based on that. I would though like ...
1
vote
0answers
269 views

How to Exclude Log Using Fail2Ban logpath with Wildcard Settings

I'm using wildcard in the logpath value as shown below: [http-get-dos] enabled = true filter = http-get-dos logpath = /var/log/ispconfig/httpd/*/access.log maxretry = 250 findtime = 300 #ban for 10 ...
1
vote
1answer
490 views

How to ban web crawler using fail2ban

I am using nginx and I am always hit by web crawler if I am correct. I tried to configure fail2ban but the IP address cannot be detected by fail2ban. The reason that it is not detected because it ...
1
vote
1answer
176 views

Yahoo AdCrawler hammering our site

Yahoo AdCrawler is re-trying some URLs repeatedly. The URLs are being given a 302 response code, so I suppose Yahoo should come back and try again "later", but "later" in my book doesn't mean that 7 ...
0
votes
2answers
2k views

Is it good idea to ban amazonaws.com [closed]

Site are crawled by anonymous bot hosted on amazon ec2. This robot doesn't respect robots.txt and creates high load on web server so I added check if reverse IP for request ends with "amazonaws.com" ...
0
votes
1answer
48 views

Is it possible to block HTTP traffic from specific machines?

I have some web crawlers, and a specific website seems to be blocking traffic temporarily after some time. The thing is, even though all clients have the same external IP address (they access the ...
0
votes
1answer
102 views

Is there a chance to block images spiders / bots on dedicated servers without using robots.txt or .htaccess?

We know that we can block certain spiders from crawling websites pages using robots.txt or .htaccess or maybe via the Apache configuration File httpd.conf. But that requires to edit may be a large ...
0
votes
2answers
689 views

Counting the number of pages in a website

What is the easiest way to get a count of the number of pages on a website? I don't want to actually download a local copy the entire site, just get a count of pages on it. Is there a tool (or ...
0
votes
1answer
106 views

How do I scan my folders for a website? Like a crawler?

I'd like to scan all the url's on my website as well as get the files in them, but the thing is, there are too many for me to do this manually so how would I do this? I'd like it formatted anyway as ...
0
votes
1answer
43 views

Referrer in access.log is a directory

It seems that the referrer on the following log is a folder. 112.200.208.5 - - [29/Jul/2013:20:43:14 +0800] "GET /sites/default/files/download/argie/pos-code.zip HTTP/1.1" 206 294677 ...
0
votes
1answer
790 views

What is “/admin/Y-ivrrecording.php?php=info&ip=uname”?

Help me please, I found an IP address from Korea try to do something with my web server by put this '/admin/Y-ivrrecording.php?php=info&ip=uname' like search a filename from my web server. I ...
0
votes
2answers
752 views

Methods to prevent malicious crawlers/scrapers and DDoS Attacks [closed]

From last couple of weeks I have been experiencing bot attacks on my site. Basically crawlers are running on the site at a high frequency rate resulting in load increase. This results in bandwidth ...
0
votes
2answers
74 views

Can access web application from browser but crawler application throws 404 erorr?

I am using an application called Xenu Link Sleuth to try and find broken links on a site we host. When I go to the site through a browser it pops right open. When I try to run it through Xenu it ...
0
votes
1answer
193 views

Can I use a Google Appliance/Mini to crawl and index sites I don't own?

Maybe this is a stupid question, but... I am working with this company and they said they needed to get "permission" to crawl other people's sites. They have a Google Search Appliance And some ...
0
votes
2answers
289 views

How should I interpret site analytics with 11 pageviews in an 3 second visit?

I'm using google analytics and recently i've noticed some weird trends going on. I have a lot of visits that last mere seconds but mark several page views... more than a normal human can see in that ...
0
votes
1answer
121 views

Getting web.archive.org to archive website again

I noticed that my website isn't archived anymore by web.archive.org. When I look at http://web.archive.org/web/*/http://www.cnn.com it is clearly visible that it stopped working in july 2008. ...
0
votes
1answer
92 views

My website might have problems being indexed by Google bots?

http://ptcsavjetovaliste.org and I think because it is in Croatian language it might have problems being indexed because of letters like čćžšđ?! Look at the crawler errors I see in Webmaster tools... ...
0
votes
1answer
2k views

Sharepoint Crawler is denied access to sites

We create all our site collections programatically with a custom site def/template. Everything works as expected, except for the crawler. It's apparently denied access to the sites. The crawl logs ...
0
votes
0answers
21 views

How to make Google crawl my site using IPv6 address when my domain name has both IPv4 and IPv6 addresses?

My domain name has both IPv4 and IPv6 addresses assigned. IPv4 connection to Google can't be available all the time due to restrictions of my campus network, but IPv6 is available all the time. ...
0
votes
1answer
70 views

Switching between multiple authentication types on same URL

I have a secure SSO site that uses Shibboleth authentication and SAML identity provider. I need to allow a Google Search Appliance crawler to come index the URL's. I have a requirement to change on ...
0
votes
0answers
71 views

Having concurrent Nutch Crawls-Solr Indexing failing

We have two jobs Nutch Crawling then indexing-. These jobs uses same nutch library and binaries directories . An example of the directory structure we have in Ubuntu server is shown below. ...
0
votes
1answer
139 views

Tool or website to check links

We supply Magento and Typo3 installations to customers. To improve QA we wanted to use an automatic link checker to check for broken and/or outdated links - automatically. We want to check all links ...
0
votes
2answers
275 views

Protection against scrapping with nginx

This morning we had a crawler going nuts on our server hitting our site almost 100 times per second. We'd like to add a protection for this. I guess I'' have to use HttpLimitReqModule but I don't ...