OKdevTV

Nutch

• Web crawler
• https://nutch.apache.org/
• https://cwiki.apache.org/confluence/display/NUTCH/NutchTutorial

Getting Started

1. download https://nutch.apache.org/download/

take ~/dev

wget https://dlcdn.apache.org/nutch/1.20/apache-nutch-1.20-bin.tar.gz
tar xvfz apache-nutch-1.20-bin.tar.gz

2. Agent Name in conf/nutch-site.xml

  <property>
    <name>http.agent.name</name>
    <value>My Nutch Spider</value>
  </property>

3. check

bin/nutch parsechecker -dumpText https://mp4.okdevtv.com

4. make seed.txt file urls/seed.txt

https://mp4.okdevtv.com/

5. Concepts

• crawldb
• linkdb
• segments set : generate, fetch, content, parse_text, parse_data, outlink URLs

6. Step seeding

bin/nutch inject crawl/crawldb urls

7. Step fetching

bin/nutch generate crawl/crawldb crawl/segments

ls -d crawl/segments/2*
s1=`ls -d crawl/segments/2* | tail -1`
echo $s1

bin/nutch fetch $s1

bin/nutch parse $s1

bin/nutch updatedb crawl/crawldb $s1

8. fetch new segments

bin/nutch generate crawl/crawldb crawl/segments -topN 1000
s2=`ls -d crawl/segments/2* | tail -1`
echo $s2

bin/nutch fetch $s2
bin/nutch parse $s2
bin/nutch updatedb crawl/crawldb $s2

bin/nutch generate crawl/crawldb crawl/segments -topN 1000
s3=`ls -d crawl/segments/2* | tail -1`
echo $s3

bin/nutch fetch $s3
bin/nutch parse $s3
bin/nutch updatedb crawl/crawldb $s3

9. Step Invertlinks

bin/nutch invertlinks crawl/linkdb -dir crawl/segments

10. Solr download https://dlcdn.apache.org/lucene/solr/

take ~/dev
wget https://dlcdn.apache.org/lucene/solr/8.11.4/solr-8.11.4.tgz
tar xvfz solr-8.11.4.tgz

11. create new nutch Solr core

cd ~/dev/solr-8.11.4
mkdir -p ./server/solr/configsets/nutch/
cp -r ./server/solr/configsets/_default/* ./server/solr/configsets/nutch/

12. copy the Nutch's schema.xml into the Solr conf directory

cp ../apache-nutch-1.20/plugins/indexer-solr/schema.xml ./server/solr/configsets/nutch/conf/

13. run solr server http://localhost:8983

bin/solr start

14. create nutch core

bin/solr create -c odevtube -d ./server/solr/configsets/nutch/conf/

15. Step: Indexing into Apache Solr

cd ~/dev/apache-nutch-1.20/
bin/nutch index crawl/crawldb/ -linkdb crawl/linkdb/ crawl/segments/20131108063838/ -filter -normalize -deleteGone

---

whitelist

java -cp lib/apache-nutch-1.20.jar:runtime/local/lib/hadoop-core-1.2.0.jar:runtime/local/lib/crawler-commons-0.6.jar:runtime/local/lib/slf4j-log4j12-1.7.5.jar:runtime/local/lib/slf4j-api-1.7.9.jar:runtime/local/lib/log4j-1.2.17.jar:runtime/local/lib/guava-16.0.1.jar:runtime/local/lib/commons-logging-1.1.3.jar:runtime/local/lib/commons-cli-1.2.jar org.apache.nutch.protocol.RobotRulesParser robots.txt url Nutch-crawler

What Else?

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