Tomcat Session Cluster

Last Update:2016-06-14 Source: Internet

Author: User

Tags session id

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Use the httpd reverse load Balancer backend Tomcat,tomcat to implement the session cluster using the own cluster service;

Implementing the Environment:

node1:172.18.11.111 Tomcata

node2:172.18.11.112 TOMCATB

node3:172.18.11.113 anti-generational scheduler httpd

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Install Tomcat on Node1 and Node2, respectively:

]# vim/etc/profile.d/java.sh

Export JAVA_HOME=/USR

]# . /etc/profile.d/java.sh

]# Yum install tomcat tomcat-lib Tomcat-webapps tomcat-admin-webapps-y

]# cd/var/lib/tomcat/webapps/

]# mkdir TestApp

]# CD testapp/

]# mkdir classes Lib Web-inf meta-inf

]# vim/var/lib/tomcat/webapps/testapp/test.jsp

<%@ page language= "java"%>

<body>

<tr>

<td>session id</td>

<% Session.setattribute ("magedu.com", "magedu.com"); %>

</tr>

<tr>

<td>created on</td>

</tr>

</table>

</body>

]# Scp-r/var/lib/tomcat/webapps/testapp/node2:/var/lib/tomcat/webapps/

]# Vim/etc/tomcat/server.xml

Add in the Host configuration section:

In Node2:

]# vim/var/lib/tomcat/webapps/testapp/test.jsp

<%@ page language= "java"%>

<body>

<tr>

<td>session id</td>

<% Session.setattribute ("magedu.com", "magedu.com"); %>

</tr>

<tr>

<td>created on</td>

</tr>

</table>

</body>

Start Tomcat on Node1 and Node2, respectively:

]# systemctl Start Tomcat.service

]# SS-TNL Monitor on port 8080;

(1) Configure Tomcat to enable the cluster:

In Node1:

]# Vim/etc/tomcat/server.xml

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In Node2:

]# Vim/etc/tomcat/server.xml

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(2) Add <distributable/> directive:

In Node1:

]# cp/etc/tomcat/web.xml/var/lib/tomcat/webapps/testapp/web-inf/

]# Vim/var/lib/tomcat/webapps/testapp/web-inf/web.xml

Add:<distributable/>

Copy the configuration file to Node2:

]# Scp/var/lib/tomcat/webapps/testapp/web-inf/web.xml node2:/var/lib/tomcat/webapps/testapp/web-inf/

Start Tomcat separately in Node1 and Node2:

]# systemctl Start Tomcat.service

On the NODE3:

Using the httpd mod_proxy module, MOD_PROXY_AJP module, mod_proxy_balancer module:

httpd using the AJP module means that Tomcat can only use the AJP linker.

Install httpd:

]# yum-y Install httpd

]# vim/etc/httpd/conf.d/mod_proxy_ajp.conf

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]# httpd-t

]# systemctl Start Httpd.service

In the browser input: http://172.18.11.113/test/test.jsp

Different hosts based on the backend of the scheduler, but the session remains the same;

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The above is based on the Tomcat session cluster approach to achieve session retention.

Tomcat Session Cluster

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