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SaaS for us is also known by Sysadmin As A Service and it’s available & included with all our VPS offerings. http://t.co/SHqldyIR #NetPres
Having recently presented an updated instance of my Tomcat Administration training course, I was able to add to the method of combining the previously posted setting of the ‘redistributable’ option for a Tomcat web application (webapp), to allow more or older Tomcat apps to run in a modern Tomcat Cluster.
This focuses around making the distribution of any ‘session’ be fully managed by the Tomcat Cluster, needing no other software to ensure logins and other sessions are retained between pages, clicks and Tomcats servicing the end-user’s browser activity as well.
The usual Java based Cookie that browsers see and use for sessions is called JSESSIONID (but this method supports any and all cookie names) and the operation of the fast and lightweight Apache web server module ‘mod_jk’ works by having the Tomcat jvmRoute name appended to JSESSIONID, for the ‘sticky_session’ activity of mod_jk Load Balancing.
It turns out that with the webapp clustered (via that redistributable=”true” Context that we set, verifiable in the catalina.out via the “session state” cluster messages), you can remove the jvmRoute setting from the Engine for each Tomcat and turn off ‘sticky_session’ in the mod_jk workers.properties file (worker.WORKERNAME.sticky_session = 0) and restart the Apache and the Clustered Tomcats, and then the JSESSIONID won’t have any jvmRoute appended to it and it’ll be a ‘normal’ Cookie, and mod_jk will just load balance between the configured workers, leaving the Tomcat Cluster to manage the sessions between the clustered Tomcats.
This allows for both transparent High Performance (HP) from your Tomcat Cluster, but also High Availability (HA) through the transparent fail-over of session based cookies and the maintaining of end-user logins etc even when Tomcat servers enter or leave the Tomcat cluster, through the front-line mod_jk Load Balancing.
Please contact us if you’d like more information about using Tomcat, Glassfish, JBoss and WebSphere for your Java Application Server hosting and content delivery.
FYI and regards,
Richard.
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Tomcat Administration Training Course for 3 days from Monday August 13th 2012 http://t.co/H3RybvYb #NetPres
We’ve confirmed the bookings for the next Tomcat Administration Training Course that I present here in Adelaide during the week starting August 13th.
This course will be run at the first-rate Training Rooms of Express Training Connections in Gawler Place, Adelaide CBD and if you’re interested, please contact Sue at ETC on by email to info@etc-australia.com or phone 08 82324502.
This is an intensive and highly-technical (requires Linux or Windows System Admin capabilities) hands-on training course run over 3-4 days, with generous lunch included by ETC. Each student has their own dedicated desktop, with virtualised local and cloud-based servers for trials, tutorials, testing and even Internet accessible ‘Production’ servers for each student.
The broad topics covered in the course are:
+ Tomcat Architecture, including installation and clustering
+ Tomcat Software Components
+ Comparison and Online Discovery of Difference between Tomcat, Glassfish, JBoss, Geronimo and WebSphere
+ Trouble Shooting and Admin features
+ Performance and Tuning
+ Common and example Tomcat Web Applications, incl. Liferay, CAS and other ‘bundled’ Tomcat systems/distributions.
There’s Tutorial, Trial sessions and an open workflow of subject presentation with multimedia support (electronic course notes supplied), then guided demonstrations and more to give deep understanding and some experience in technical details of Tomcat operations.
As per above, please contact Sue at ETC on by email to info@etc-australia.com or phone 08 82324502 if you have any interest or follow-up queries on this course being presented in late February in Adelaide, South Australia.
FYI and regards,
Richard.
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SaaS for us is also known Sysadmin As A Service and it’s available & included with all our VPS offerings. http://t.co/SHqldyIR #NetPres
