If i was you i wouldnt even start without 8GB of RAM on each server!
On Sep 29, 2011 9:26 AM, "Sam Hokin" <s...@ims.net> wrote:
> Hi, folks. I've got what I consider to be a fairly significant production
implementation of Tomcat with, currently, 89
> contexts in 30 hosts on two concurrent servers. Everything works fine ...
except when it doesn't. As the number of
> contexts and hosts have increased, there have been more and more JVM
and/or Tomcat crashes, typically a couple per week
> lately, on one or both servers. The error messages vary from nothing at
all in catalina.out, to exceptions regarding
> database connections, to exceptions about threads. Basically, I've been
trying to find some good advice on
> configuration in my situation and haven't been able to find much.
>
> In a bit more detail, the deployment is as follows:
>
> (2) Dell 1950 8-CPU servers running Fedora 14 Linux 2.6.35, one with 2 GB
RAM and one with 4 GB RAM
> (2) Tomcat 7.0.16 instances, one on each server, running clustered
contexts in "distributable" mode, under Sun JDK 1.6.0
> One server runs Apache HTTPD, using mod_proxy_ajp to connect to the two
Tomcat instances and manage balancing
> The other server runs PostgreSQL, the database used by the apps, which
connect to it via JNDI/JDBC connection pooling
>
> There are a few contexts that run on only one or the other server (namely,
Softslate and Searchblox, which are not
> serialized to support clustering). Most contexts, which run my app, run in
parallel on both servers. I've implemented
> clustering to maintain site availability when a Tomcat instance goes down.
>
> I could post up all the various JVM and Tomcat parameters, but I'm really
looking for any definitive list of tips for
> things to try to improve stability. If anyone has written or seen a
"how-to" document on multi-host, multi-context
> deployments like this, please share! Thanks!!
>
> P.S. One option I've considered is to run KVM and run each host in its own
virtual OS. To me that's a ridiculous amount
> of OS overhead to deal with occasional Tomcat outages, but it probably
would be one solution, much more difficult to
> maintain than a single Tomcat instance per server running all the hosts
and contexts. If you've had experience running
> multiple Tomcat instances in separate virtual machines, I'd be curious to
hear how it went.
>
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