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Apache Solr is a search platfrom from Apache Lucene Project. Drupal has integration with Apache Solr which is provided by Search API solr search which is dependent on Search API module. Solr Server is usually installed on some external server which is used to index search data. Since servers are capable enough to index data for multiple sites, the same server can be configured to index data for multiple sites, this particular configuration is called Multi-Core Solr Configuration.

On a linux server, the following packages have to be installed.(This blog is basically aimed for ubuntu, please find the corresponding command for your linux distributions.)

• Java.
• Tomcat.

 

sudo apt-get install openjdk-7-jdk #Install Java

 

sudo apt-get install tomcat6 tomcat6-admin tomcat6-common tomcat6-user tomcat6-docs tomcat6-examples

Start tomcat

 

sudo /etc/init.d/tomcat6 restart

 

Tomcat runs on port 8080, so tying http://example-server:8080/ would show a page saying "It works !".

Dowload Apache Solr and extract the file

 

 wget http://apache.techartifact.com/mirror/lucene/solr/3.6.0/apache-solr-3.6.... tar -xvzf apache-solr-3.6.0.tgz

 

Look for tomcat

 

whereis tomcat6

# The output should be tomcat6: /etc/tomcat6 /usr/share/tomcat6

 

cd /usr/shara/tomcat6

 

mkdir webapps # This folder should be created by default when you install tomcat, in case it is not there create one.

 

Copy the solr apache-solr-3.6.0.war into webapps folder. To the directory where apache solr was extracted.

 

sudo cp apache-solr-3.6.0/dist/apache-solr-3.6.0.war /usr/share/webapps/solr.war

Copy the example Apache SOLR application directory and all files within (in the unpacked folder) to a new solr folder in /usr/share/tomcat6:

 

sudo cp -R apache-solr-3.6.0/example/solr /usr/share/tomcat6/solr/

Create the Tomcat6-SOLR config file in /etc/tomcat6/Catalina/localhost/solr.xml

 

sudo vim /etc/tomcat6/Catalina/localhost/solr.xml

 # Add following lines to the file

 

 

<Context docBase="/usr/share/tomcat6/webapps/solr.war" debug="0" privileged="true" allowLinking="true" crossContext="true">
<Environment name="solr/home" type="java.lang.String" value="/usr/share/tomcat6/solr" override="true" />
</Context>

 

Edit the Tomcat6 tomcat-users.xml file to add users to manage tomcat6

 

sudo nano /etc/tomcat6/tomcat-users.xml

 

<tomcat-users>
<role rolename="admin"/>
<role rolename="manager"/>
<user username="admin" password="my-password" roles="admin,manager"/>
</tomcat-users>

 

Edit the file

 

sudo vim /etc/default/tomcat6

 

In the above opened file, make sure that below configuration is set to no.

TOMCAT6_SECURITY=no

This completes the Solr Installation. Next we would connect a Drupal Site to Solr.

Download the required modules

 

drush dl search_api search_api_solr search_api_page

 

Download the Solr PHP Client and copy it to sites/all/libraries.

Make the backups of the defaut files.

 

 

cd /usr/share/tomcat6/solr/conf

 

sudo mv schema.xml schema.orig.xml

 

 sudo mv solrconfig.xml solrconfig.orig.xml

 

Now copy these files from the search api solr module. Goto sites/all/modules/search_api_solr/includes of your Drupal installation and copy the schema.xml and solrconfig.xml files to /usr/share/tomcat6/solr/conf

 

sudo cp schema.xml /usr/share/tomcat6/solr/conf/schema.xml

 

 sudo cp solrconfig.xml/usr/share/tomcat6/solr/conf/solrconfig.xml

Now configure the server in multi core configuration.

Goto the directory where apache solr was extracted

 

sudo cp ~/apache-solr-3.6.0/example/multicore/solr.xml /usr/share/tomcat6/solr/solr.xml

 

 

Each site should have different configuration in /usr/share/tomcat6/solr

Suppose we have two sites: site1, site2

 

sudo mkdir /usr/share/tomcat6/solr/site1 # Configuration for Drupal Site 1.

 sudo mkdir /usr/share/tomcat6/solr/site2 # Configuration for Drupal Site 2.

 

Then, copy the /usr/share/tomcat6/conf directory into each directory you create:

 

sudo cp -R /usr/share/tomcat6/solr/conf/ /usr/share/tomcat6/solr/site1/conf/

 

sudo cp -R /usr/share/tomcat6/solr/conf/ /usr/share/tomcat6/solr/site2/conf/

 

Edit the solr.xml file in /usr/share/tomcat6/solr to add your site

 

sudo nano /usr/share/tomcat6/solr/solr.xml

 

# The content of the file would be

 

<cores adminPath="/admin/cores">
    <core name="site1" instanceDir="site1" />
    <core name="site2" instanceDir="site2" />
  </cores>
</solr>

 

 

where each line <core name/> is for different sites. You can add another sites by adding another <core name="sitex" instanceDir="sitex" /> to this file.

 

Now for the site1 Drupal Installation enable the module Search API Search API Solr and do it site2 too.

 

drush en search_api search_api_solr

 

In the Search API configuration(admin/config/search/search_api) and click add server and fill in the following details

• Server Name: Site 1 Solr Server.
• Solr host: localhost or the remote host.
• Solr port: 8080
• Solr path: solr/site1 # This is the one defined in solr.xml file.

And save it, you should get a messsage: The Solr server could be reached (latency: 2.6741027832031 ms).

Similarly do it for site2, the only difference would be the Solr path which should be set to: solr/site2.

So two sites have their search data being indexed at a central place, but the index data of one site will not corrupt the data of other as they are configured in different directories.