Difference between revisions of "SUNScholar/Optimisations/Tomcat"

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===Apache mod_jk module===
 
===Apache mod_jk module===
−
*Remove "mod_jk", use "authbind" exclusively with no need of the Tomcat AJP connector in order to reduce the CPU and memory load
+
*Remove "mod_jk", use "authbind" exclusively in order to reduce the CPU and memory load
 
  http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S05
 
  http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S05
 +
 
===Max Threads===
 
===Max Threads===
 
Added the following to '''/etc/tomcat6/server.xml".
 
Added the following to '''/etc/tomcat6/server.xml".

Revision as of 03:03, 13 August 2015

Back to Optimisations

When using the Ubuntu 16.04 LTS server change all instances of tomcat to tomcat8.

When using the Ubuntu 14.04 LTS server change all instances of tomcat to tomcat7.

When using the Ubuntu 12.04 LTS server change all instances of tomcat to tomcat6.

Log Files

Edit the following file: 

sudo nano /etc/default/tomcat7

Check and modify the log file settings as needed.

In addition, disabled access log with Tomcat7 in the /etc/tomcat7/server.xml file.

See example below: 

        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html
             Note: The pattern used is equivalent to using pattern="common" -->
        <!-- <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log." suffix=".txt"
               pattern="%h %l %u %t "%r" %s %b" />
       -->

Server Security

Apache mod_jk module

  • Remove "mod_jk", use "authbind" exclusively in order to reduce the CPU and memory load
http://wiki.lib.sun.ac.za/index.php/SUNScholar/Prepare_Ubuntu/S05

Max Threads

Added the following to /etc/tomcat6/server.xml". 

maxThreads="450"

To able to handle many connections at once.

DNS Lookups

Added the following to /etc/tomcat6/server.xml". 

enableLookups="false"

Remove "development mode" of Tomcat by adding the above to reduce DNS lookups.

Http Header Errors

Added the following to /etc/tomcat6/server.xml". 

  maxHttpHeaderSize="16384"

This was required after an upgrade from DSpace 1.8.2 to 3.2.

This stopped excessive header size errors.

See: http://tomcat.apache.org/tomcat-6.0-doc/config/http.html#HTTP/1.1_and_HTTP/1.0_Support for further help

Another possible solution is here from the DSpace mailing lists.

If the number of group is hight you can reach the HTTP header limit already managed in this thread or a "tooManyClause Exception" in solr, that can be "solved" incrementing this parameter. 

https://github.com/DSpace/DSpace/blob/master/dspace/solr/search/conf/solrconfig.xml#L474

When the number is to large you could also consider to disable the awareness right feature, commenting this line 

https://github.com/DSpace/DSpace/blob/master/dspace/config/spring/api/discovery.xml#L25

Default Context

Edit the following file and then rebuild DSpace: 

nano $HOME/source/dspace/config/default.context.xml

Production Settings

reloadable="false" cachingAllowed="false" allowLinking="false"

Development Settings

reloadable="true" cachingAllowed="false" allowLinking="true"

It is worth noting that the Apache Tomcat documentation recommends production sites leave the default values in place.

See example below: 

<?xml version="1.0" ?>
<Context debug="0" reloadable="false" cachingAllowed="true" allowLinking="true" crossContext="true">
	<WatchedResource>WEB-INF/web.xml</WatchedResource>
	<Parameter name="dspace-config" override="false"
		value="/home/dspace/config/dspace.cfg"
		description="Path to the DSpace configuration file." />
</Context>

See Tomcat documentation links below;

UTF-8

References

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