Rainer,
Thanks for your feedback:
> Also: if you do clustering, you might be concerned about availability. > The
> load balancer itself is a single point of failure, unless you > implement
> some redunfdancy in that layer to.
That's another concern I have. I was thinking of Linux HA - although I have
never used it so I'm hoping its not that difficult to setup/administer.
> Date: Wed, 6 Feb 2008 22:33:39 +0100> From: [EMAIL PROTECTED]> To:
> users@tomcat.apache.org> Subject: Re: Tomcat and Apache mod_jk For Failover>
> > Hi James,> > James Ellis schrieb:> > I am trying to set up a cluster of
> Tomcat servers where they> > replicate session btwn the tomcat servers. My
> questions are:> > > > 1) For failover, if I am using apache/mod_jk as a load
> balancer, will> > it automatically detect if one of the members in the
> cluster is down> > and not route requests to it?> > Yes, if the problem is
> formally detectable, e.g. network problems, no > responses etc. What problems
> get detected depends much on configuration. > Have a look at> >
> http://tomcat.apache.org/connectors-doc/generic_howto/timeouts.html> > and
> for a complete list of attributes at> >
> http://tomcat.apache.org/connectors-doc/reference/workers.html> > You should
> configure a status worker, such that you can inspect your > load balancer
> status via a HTML GUI. See> >
> http://tomcat.apache.org/connectors-doc/reference/status.html> > > 2) Are
> there any issues assoicated with SSL and apache as the load> > balancer?> >
> Not that I'm aware of, but maybe I don't get the point. Usually you >
> terminate SSL on httpd and then simply use AJP13 as a protocol between >
> mod_jk and Tomcat. More or less it's the only protocol mod_jk speaks.> > The
> module then automatically tells Tomcat, if the original request was > coming
> in via http or https.> > > 3) Are there performance gains by using
> Apache/mod_jk as the load> > balancer, or should I just use another Tomcat
> instance and the> > "balancer" web app?> > More often performance is not the
> key decision criterion. I assume the > balancer webapp is not really
> production grade, but others might correct > me here.> > To choose the right
> load balancing solution, you have to decide which > people should administer
> and troubleshoot it, and which technology best > fits their skills (network
> appliances, Apache web server with mod_jk, ...).> > Also: if you do
> clustering, you might be concerned about availability. > The load balancer
> itself is a single point of failure, unless you > implement some redunfdancy
> in that layer to.> > > Thanks,Jim> > Regaqrds,> > Rainer> >
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