Databases
StackOverflow2013
Postsdbo
POTomcat active passive failover
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POTomcat active passive failover
    primarykey
    data
    text
    <p>I'm trying to make my application highly available using <strong>active/passive</strong> method. I currently deploy the application on a Tomcat server, which could either be hosted on Windows or Linux platform.</p> <p>So, now I deploy it on two Tomcat servers. Each server runs on a separate machine. I configure the Tomcats to be of the same cluster via Tomcat configuration which gives me session replication (storing in DB). I use some web server / load balancer to redirect requests (not decided yet).</p> <p>The problem is that the application <em>cannot run simultaneously on both Tomcats</em> since it is currently stateful (and it's too costly to make it stateless). I actually need that only <em>one</em> Tomcat will be up at the same time. Or, for the least, that only one application will be started on a Tomcat.</p> <p>To sum it up, I need a software that can:</p> <ol> <li>Identify invalid state of application via HTTP request (either machine/Tomcat is down or application is otherwise unresponsive);</li> <li>Start Tomcat instance or application on Tomcat when the other application is identified as invalid;</li> <li>Stop Tomcat instance or application on Tomcat when it's identified as invalid.</li> <li>Support both Linux and Windows platforms...</li> </ol> <p>This product can be a library that's used on our JVM, it may be separate monitoring processes that reside on the Tomcats machines and communicate with each-other and with the Tomcats, it may use our DB. It may use the web server machine...</p> <p>I searched for off-of-the-shelf products that do it (<a href="http://clusterlabs.org/wiki/Pacemaker" rel="nofollow">Pacemaker</a>/<a href="http://www.corosync.org/" rel="nofollow">CoroSync</a>/<a href="http://www.keepalived.org/" rel="nofollow">keepalived</a>), all not supporting Windows (as far as I understand).</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USyair
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POTomcat active passive failover
      1. This table or related slice is empty.
      1. VTUpMod
    1. COlook at my answer over at http://stackoverflow.com/questions/11465714/tomcat-webapp-failover - might solve your problem
      singulars
      1. POTomcat active passive failover
      1. USErich Eichinger
    2. COMight be a good reason to look at a clusterable application server, where the nodes know of one another. Glassfish 3.1.2 might be usable to you in the open source edition.
      singulars
      1. POTomcat active passive failover
      1. USThorbjørn Ravn Andersen
    3. CO@ThorbjørnRavnAndersen hope you didn't read my own answer here :) (many words there). Anyway, it's interesting to know that Glassfish supports clustering but replacting our servers wasn't acceptable. Thanks.
      singulars
      1. POTomcat active passive failover
      1. USyair
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload