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From: <Mohit.Garg@rbs.com>
To: <users@tomcat.apache.org>, <aw@ice-sa.com>
Date: Wed, 6 Feb 2013 11:20:16 +0000
Subject: RE: Tomcat
Thread-Topic: Tomcat
Thread-Index: Ac4EWDlCnVEaeHKtT26lv0Z5GerN3AAAyygQ
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=20
Hi
Thanks for all the help and I know it may sound lame but I am trying to lea=
rn these things.
Although I have one more doubt.
If we have multiple tomcat for multiple environment on the single Unix box(=
machine)
Now Single Apache daemon is running for multiple environment. So can we run=
 multiple instance of Apache daemon in the same machine or not for each dif=
ferent environment.
If this is possible how can we accomplish this.

Thanks in advance for the help and sorry for bugging the group with such si=
lly questions.

MOHIT GARG
Analyst=20
International Banking
RBS
Block No 1, Tower A, Unitech Infospace Complex Sector 21, Gurgaon, Haryana,=
 122002, India
Office: +91 8860190177  =20

-----Original Message-----
From: Andr=E9 Warnier [mailto:aw@ice-sa.com]=20
Sent: 06 February 2013 16:21
To: Tomcat Users List
Subject: Re: Tomcat

Mohit.Garg@rbs.com wrote:
> Hi
> =20
> Regrets for the wrong framing of question.
> Actually I am new to tomcat and what I really want to do is run on the sa=
me server two different tomcats so that one doesn't interfere with the work=
ing of the other.
> As I have different environments so I want that the tomcat running in my =
development environment do not access the files of my SIT environment and v=
ice-versa. That's why I want to have a separate tomcat process for each hos=
t.
> If I just change the port in the config file the request will be mapped b=
ut the various environments will have access to all the files as it will be=
 present in the common directory.
>=20

Ah, that's better.
So we forget about Apache httpd, right ?
So, assuming that you are talking about tomcat only :

There are (many) different levels of separation, depending on what you real=
ly want to separate.

First, a note : considering that you are on a Linux machine, it is highly p=
ossible that you have installed Tomcat using a pre-packaged version from yo=
ur Linux distribution.
These packages work fine and are easy to install for a normal single-instan=
ce case, but they make it more difficult for doing the kind of thing that y=
ou want to do, and more difficult for people on this list to help you.  Tha=
t is because each of these packages distributes the files of Tomcat in diff=
erent places on the disk, sets different environment variables, sets differ=
ents links from one directory to the other in the filesystem, etc..
So it would be better to install a "standard" tomcat downloaded from the we=
bsite "tomcat.apache.org", to some directory like /opt/tomcat, and follow t=
he instructions that are given in the "RUNNING.txt" file at the top of this=
 distribution.
This way, everyone here knows what you are talking about and has a good ide=
a of where things are.
(You can also leave your current Tomcat where it is, and consider it as you=
r "production"=20
tomcat, and download and install another copy to another directory as your =
"development"=20
tomcat. Then we can maybe help you set up this development tomcat in a way =
that does not conflict with the other one).

Then, the next question is : you want to run 2 "separate" tomcats, so as no=
t to mix the production and the development environments. That's establishe=
d.
But do you want also to be able to run 2 different /versions/ of Tomcat ?

If yes, you will have to download and install tomcat twice, to 2 separate d=
irectories in /opt (such as /opt/tomcat-prod and /opt/tomcat-dev for instan=
ce).
If not, then one single copy of tomcat will be enough, and you can configur=
e things to still run 2 different "instances" of tomcat, from one single co=
py of the code.


Then, some advance information :
There are 2 environment variables which point to disk directories and which=
 are very important for what you want to do :

CATALINA_HOME : this tells Tomcat where its runnable *code* is located.  un=
der CATALINA_HOME, Tomcat expects to find for example it's "bin" subdirecto=
ry, where the main executable parts of Tomcat are located.

CATALINA_BASE : this tells Tomcat where its instance-specific "things" are =
located. For example, Tomcat will look into $CATALINA_BASE/conf to find its=
 main configuration files.

By default, these 2 values are the same, and Tomcat will use the same /bin,=
 /conf etc..

But you can set up 2 tomcat instances to use the same $CATALINA_HOME direct=
ory (so they will run the same Tomcat code from $CATALINA_HOME/bin), but ha=
ve different $CATALINA_BASE directories (so they will use a different confi=
guration from $CATALINA_BASE/conf, different webapps from $CATALINA_BASE/we=
bapps etc).

That's the basics for separating two tomcat instances.

Note that there is still a much easier way, using a single Tomcat instance =
and just 2 separate "virtual hosts" inside the same running Tomcat (see : h=
ttp://tomcat.apache.org/tomcat-7.0-doc/virtual-hosting-howto.html).
The hostnames will be different, and the webapps will be completely separat=
e.  But there will still be one single instance of tomcat running, and ther=
e /could/ be interference between them (not at the access level, but in the=
 sense that one webapp could use up all the memory and so interfere with th=
e other e.g.).


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