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Subject: Re: Tomcat Upgrade & Migration Questions
From: Daniel Mikusa <dmikusa@vmware.com>
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 <CAGwUgXt2ZQcDUDsgLUUsEbNhtUYKQJx-irCBFAdD=A70-jEyxw@mail.gmail.com>
Date: Wed, 6 Feb 2013 09:30:45 -0500
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 <CAGwUgXt2ZQcDUDsgLUUsEbNhtUYKQJx-irCBFAdD=A70-jEyxw@mail.gmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>

On Feb 6, 2013, at 1:24 AM, Kirk Hoganson wrote:

> I am currently in the middle of an upgrade from Apache (2.2)/Tomcat
> (5.5.16) to Apache (2.2)/Tomcat (6.0.24).  The JVM is being upgraded =
from
> 1.5.0_09-b01 to 1.6.0_22-b22.  The new host servers will be RedHat =
6.2.

Why are you upgrading to 6.0.24 & Java 1.6.0_22?  These are already =
multiple versions out of date.  Do yourself a favor and upgrade to the =
latest release of each, which at this time is 6.0.36 and Java 1.6.0_39.

> I would like to use the default application installation paths used by =
the
> RPMs. =20

I can understand the temptation to do this, but you should really =
install Tomcat direct from http://tomcat.apache.org.  You'll get the =
latest version and it's packaged in a way that is familiar to everyone =
on this list, which means we can help you with problems.=20

> However, I would like the user code base(s) to exist in a separate
> partition.  These servers will be hosting multiple separate java
> applications. =20

Not sure what you mean by "code base".  Are you referring to the WAR =
files for your applications? =20

If so, those are normally placed into your "webapps" directory.  You can =
change that directory by changing the "appBase" attribute of the <Host/> =
tag.

  =
https://tomcat.apache.org/tomcat-6.0-doc/config/host.html#Common%20Attribu=
tes

Or you can place a context file in "conf/<service>/<host>/<appName>.xml" =
and use "docBase" to specify the location of your WAR file.  Note, you =
would only do this if the path to the WAR file is not inside your =
"webapps" (i.e. appBase) directory already.

  https://tomcat.apache.org/tomcat-6.0-doc/config/context.html

> Currently Apache and Tomcat use mod_jk as the connector.
>=20
> I am hoping for some advice that will help me with the =
server/Tomcat/Apache
> configuration.  I am specifically interested in Tomcat configuration
> advice, or direction.  I would like to get some clarification on the
> following questions:
>=20
> How can I configure Tomcat to allow each individual application (JVM) =
to be
> restarted independently?
>=20
>   - We currently do this with separate CATALINA_BASE directories, and
>   separate startup/shutdown scripts.  I=92m not sure if that is the =
cleanest
>   way.

If you need to isolate your applications, i.e. one application per JVM, =
then this is the way to go.  It will also allow you to restart your =
Tomcat servers independently.  It may seem like a waste of memory, but =
the overhead of Tomcat is very small so it's not as bad as you might =
initially think.

An alternative approach would be to run all of your web apps in one =
Tomcat instance.  You could then reload individual applications using =
the Manager interface or you could undeploy / redeploy them.  This will =
restart your applications, but it's not quite the same as restarting the =
Tomcat server. =20

What you do depends on your needs.

>=20
> What method would best allow Apache to serve static content, and =
Tomcat to
> server java based dynamic content?
>=20
>   - I=92m assuming this will depend on the connector used.

The exact configuration to use will depend on how you proxy to your =
Tomcat server.  That being said, the general idea is that you keep =
requests to your static resources from being proxied to your Tomcat =
servers.  This then allows Apache HTTPD to service those requests.

This can either be done inclusively, i.e. by mapping only the paths =
which should be proxied, or exclusively by proxying everything and =
specify certain paths that should not be proxied.

With mod_proxy, you use ProxyPass and ProxyPass with an "!" (excludes) =
at the end of the path.

Ex:

  ProxyPass /myapp
  ProxyPass /myapp/static !

With mod_jk, you use JkMount and JkUnMount.


>=20
> Which connector (mod_jk, mod_proxy_ajp, mod_cluster) should be used?

=
http://markmail.org/message/dftgdokeyebqd4ep?q=3Ddeciding-between-modjk-mo=
dproxyhttp-and-modproxyajp

>=20
>   - I have heard conflicting reports about mod_jk being deprecated or =
not.

This is not true.  There are similarly named projects that you shouldn't =
use though, like mod_jk2, mod_jserv and mod_webapp.

>   - I have seen benchmarks with mod_proxy_ajp outperforming mod_jk
>   significantly.

I have not heard this, where did you see these?

Dan

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