Re: Multiple domian names one web site different content

[john Matlock]

There is another approach, which is what I use.  I presume that you are
using some kind of web programming language such as ASP, ColdFusion (which
I use) or something like that. All (I believe) web servers maintain a list
of CGI Variables, one of which is:

SERVER_NAME Your server's fully qualified domain name (e.g. www.cgi101.com)

ColdFusion and I presume others allow you access to this variable.  I then
wrote a little program which is set up as the home page for all sites on my
server.  This little program then accesses the SERVER_NAME that was called
in the URL.  If this variable is www.Site1.com control is transferred to
the directory/home page for Site1.  If it is www.Site2.com it goes to the
directory/home page for Site 2.  I have hosted as many as twenty two
entirely separate sites using this technique.

I presume that you don't want to have twenty two separate tomcat instances
running on your server.

John Matlock

On Fri, Mar 4, 2016 at 2:55 PM, Jeffrey Janner <jeffrey.jan...@polydyne.com>
wrote:

> > -Original Message-
> > From: Christopher Schultz [mailto:ch...@christopherschultz.net]
> > Sent: Friday, March 04, 2016 3:36 PM
> > To: Tomcat Users List <users@tomcat.apache.org>
> > Subject: Re: Multiple domian names one web site different content
> >
> > -BEGIN PGP SIGNED MESSAGE-
> > Hash: SHA1
> >
> > Jose,
> >
> > On 3/4/16 3:46 PM, Jose María Zaragoza wrote:
> > > Maybe my question does't have to do with current thread ( an
> > > probably doesn't have any sense at all) but :
> > >
> > > would be possible to define "VirtualHost" according the destination
> > > port ? I know that VirtualHost diferent domain name, but i want to
> > > keep the same domain name and to define 2 connectors , listening on
> > > 8080 and 8081 Requests to 8080 go to /webapps-app1 and requests to
> > > 8081 go to /webapps-app2
> > >
> > > is it possible in a only one Tomcat instance ? or  I need to
> > > configure 2 tomcat instances ?
> >
> > You would need to configure Tomcat to listen on two different
> > interfaces (or two different ports as you have above), plus have those
> >  in separate s in Tomcat's configuration so their
> > s wouldn't interfere.
> >
> > More trouble than it's worth IMO.
> >
> > - -chris
>
> Chris's approach is correct.  That's the only way to separate 
> by .
> If you are stuck with that approach for some reason, it's what you'd need
> to do.  But might as well have two separate tomcat instances.  After all,
> that is what setting up multiple  configs is really accomplishing.
> The only advantage this gives you is if you are tight on memory and need
> to share the JVM's heap space between the webapp. (note: this only shares
> the memory, neither has access to the other's objects.)
> Used to do this for some smallish webapps on Windows, primarily to give
> each webapp/host it's own connector set for 80/443 without having to do
> dances around that default host stuff.
> Nowadays, I'm on linux with a load-balancing front-end that can properly
> serve the correct SSL certificate, so it's not so important.
>
> Jeff
>
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>

RE: Multiple domian names one web site different content

[Jeffrey Janner]

> -Original Message-
> From: Christopher Schultz [mailto:ch...@christopherschultz.net]
> Sent: Friday, March 04, 2016 3:36 PM
> To: Tomcat Users List <users@tomcat.apache.org>
> Subject: Re: Multiple domian names one web site different content
> 
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
> 
> Jose,
> 
> On 3/4/16 3:46 PM, Jose María Zaragoza wrote:
> > Maybe my question does't have to do with current thread ( an
> > probably doesn't have any sense at all) but :
> >
> > would be possible to define "VirtualHost" according the destination
> > port ? I know that VirtualHost diferent domain name, but i want to
> > keep the same domain name and to define 2 connectors , listening on
> > 8080 and 8081 Requests to 8080 go to /webapps-app1 and requests to
> > 8081 go to /webapps-app2
> >
> > is it possible in a only one Tomcat instance ? or  I need to
> > configure 2 tomcat instances ?
> 
> You would need to configure Tomcat to listen on two different
> interfaces (or two different ports as you have above), plus have those
>  in separate s in Tomcat's configuration so their
> s wouldn't interfere.
> 
> More trouble than it's worth IMO.
> 
> - -chris

Chris's approach is correct.  That's the only way to separate  by 
.
If you are stuck with that approach for some reason, it's what you'd need to 
do.  But might as well have two separate tomcat instances.  After all, that is 
what setting up multiple  configs is really accomplishing.
The only advantage this gives you is if you are tight on memory and need to 
share the JVM's heap space between the webapp. (note: this only shares the 
memory, neither has access to the other's objects.)
Used to do this for some smallish webapps on Windows, primarily to give each 
webapp/host it's own connector set for 80/443 without having to do dances 
around that default host stuff.
Nowadays, I'm on linux with a load-balancing front-end that can properly serve 
the correct SSL certificate, so it's not so important.

Jeff

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Re: Multiple domian names one web site different content

[Tim Watts]

On Fri, 2016-03-04 at 21:46 +0100, Jose María Zaragoza wrote:
> Maybe my question does't have to do with current thread ( an probably
> doesn't have any sense at all) but :
> 
> would be possible to define "VirtualHost" according the destination port ?
> I know that VirtualHost diferent domain name, but i want to keep the
> same domain name
> and to define
> 2 connectors , listening on 8080 and 8081
> Requests to 8080 go to /webapps-app1 and requests to 8081 go to /webapps-app2
> 

Is there an implied requirement that host:8080/webapp1 should be
serviced ONLY on 8080 and likewise for 8081/webapp2?  If so I think a
config along these lines would work:

















where ${app-base1} and ${app-base2} are distinct non-nested directories
and webapp1 and webapp2 are located within the respective app-bases.

But read the Configuration reference for details.

http://tomcat.apache.org/tomcat-8.0-doc/config/ Depending on which
version of Tomcat you're using.


> is it possible in a only one Tomcat instance ? or  I need to configure
> 2 tomcat instances ?
> 
> Thanks and regards
> 
> 
> 
> 
> 
> 
> 2016-03-04 19:11 GMT+01:00 Christopher Schultz :
> > -BEGIN PGP SIGNED MESSAGE-
> > Hash: SHA1
> >
> > Andrew,
> >
> > On 3/4/16 7:44 AM, Andrew Hardy wrote:
> >> New to web servers.
> >
> > Welcome.
> >
> >> This may be a spring MVC question rather than tomcat, I'm not
> >> sure.
> >>
> >> I understand I can map multiple domains to a single ip address
> >> using DNS.  I have read some stuff on how to set up multiple
> >> virtual hosts on the same host (ip address) on tomcat which
> >> requests can be diverted to depending on which domain name was used
> >> to make the request.
> >>
> >> Alternatively I am wondering about not having multiple virtual
> >> hosts (which I am guessing would be more useful if there was
> >> significant difference between between the sites) but have a single
> >> site which has a single layout structure etc but serves up
> >> specifically tailored content from a selected content store BASED
> >> on the domain used to make the request.
> >>
> >> Is this anything to do with tomcat or do I have to some how tell
> >> which domain was used when the http session is begun and set which
> >> content at that point using spring MVC.  Perhaps the (first)
> >> request / session includes the domain used and I so need to access
> >> that programatically?
> >
> > You mean one single instance of the application that handles the
> > hostname of the request to make decisions? Sounds good, and doesn't
> > really involve Tomcat.
> >
> > If you have a session contained in a single web application, you could
> > either store the initial server hostname in the session and use that
> > until the session ends, or you could always pull the hostname from
> > each incoming request. Presumably, it won't be changing. Or, you could
> > cross-check those hostnames and maybe change configuration or complain
> > and log the user out in that event.
> >
> > Again, not much to do with Tomcat, which will just route all
> > appropriate requests to your application.
> >
> >> Is there a reason for this situation that I should not do things
> >> the way I suggest? but should use multiple "identical duplicate"
> >> web sites (virtual hosts) apart from each of which being hard coded
> >> to access a specific content store?
> >
> > For me, it always comes down to complexity. If you know you can do
> > this with a webapp-per-domain, then that's certainly a possibility but
> > you'll need more heap space for multiple web applications, and so you
> > might not scale as well.
> >
> > On the other hand, you may have to significantly re-work your web
> > application to be able to handle one-single-webapp that can
> > auto-switch configuration based upon the client's server-hostname. If
> > that's the case, then running a single-application represents more
> > risk -- at least for now.
> >
> > If I were designing things from scratch and I knew I'd be supporting
> > marge numbers of configurations, I'd go with the
> > single-webapp-instance approach because it's more scalable.
> >
> > - -chris
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Re: Multiple domian names one web site different content

[Christopher Schultz]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Jose,

On 3/4/16 3:46 PM, Jose María Zaragoza wrote:
> Maybe my question does't have to do with current thread ( an
> probably doesn't have any sense at all) but :
> 
> would be possible to define "VirtualHost" according the destination
> port ? I know that VirtualHost diferent domain name, but i want to
> keep the same domain name and to define 2 connectors , listening on
> 8080 and 8081 Requests to 8080 go to /webapps-app1 and requests to
> 8081 go to /webapps-app2
> 
> is it possible in a only one Tomcat instance ? or  I need to
> configure 2 tomcat instances ?

You would need to configure Tomcat to listen on two different
interfaces (or two different ports as you have above), plus have those
 in separate s in Tomcat's configuration so their
s wouldn't interfere.

More trouble than it's worth IMO.

- -chris
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RE: Multiple domian names one web site different content

[Caldarale, Charles R]

> From: David kerber [mailto:dcker...@verizon.net] 
> Subject: Re: Multiple domian names one web site different content

> No, one tomcat instance can't listen on two different ports at the same 
> time.

??? If that were true, Tomcat couldn't support both HTTP and HTTPS.  Simply 
configure multiple  elements, one for each desired port number.

 - Chuck


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Re: Multiple domian names one web site different content

[David kerber]

On 3/4/2016 3:46 PM, Jose María Zaragoza wrote:

Maybe my question does't have to do with current thread ( an probably
doesn't have any sense at all) but :

would be possible to define "VirtualHost" according the destination port ?
I know that VirtualHost diferent domain name, but i want to keep the
same domain name
and to define
2 connectors , listening on 8080 and 8081
Requests to 8080 go to /webapps-app1 and requests to 8081 go to /webapps-app2

is it possible in a only one Tomcat instance ? or  I need to configure
2 tomcat instances ?


No, one tomcat instance can't listen on two different ports at the same 
time.



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Re: Multiple domian names one web site different content

[Jose María Zaragoza]

Maybe my question does't have to do with current thread ( an probably
doesn't have any sense at all) but :

would be possible to define "VirtualHost" according the destination port ?
I know that VirtualHost diferent domain name, but i want to keep the
same domain name
and to define
2 connectors , listening on 8080 and 8081
Requests to 8080 go to /webapps-app1 and requests to 8081 go to /webapps-app2

is it possible in a only one Tomcat instance ? or  I need to configure
2 tomcat instances ?

Thanks and regards






2016-03-04 19:11 GMT+01:00 Christopher Schultz :
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Andrew,
>
> On 3/4/16 7:44 AM, Andrew Hardy wrote:
>> New to web servers.
>
> Welcome.
>
>> This may be a spring MVC question rather than tomcat, I'm not
>> sure.
>>
>> I understand I can map multiple domains to a single ip address
>> using DNS.  I have read some stuff on how to set up multiple
>> virtual hosts on the same host (ip address) on tomcat which
>> requests can be diverted to depending on which domain name was used
>> to make the request.
>>
>> Alternatively I am wondering about not having multiple virtual
>> hosts (which I am guessing would be more useful if there was
>> significant difference between between the sites) but have a single
>> site which has a single layout structure etc but serves up
>> specifically tailored content from a selected content store BASED
>> on the domain used to make the request.
>>
>> Is this anything to do with tomcat or do I have to some how tell
>> which domain was used when the http session is begun and set which
>> content at that point using spring MVC.  Perhaps the (first)
>> request / session includes the domain used and I so need to access
>> that programatically?
>
> You mean one single instance of the application that handles the
> hostname of the request to make decisions? Sounds good, and doesn't
> really involve Tomcat.
>
> If you have a session contained in a single web application, you could
> either store the initial server hostname in the session and use that
> until the session ends, or you could always pull the hostname from
> each incoming request. Presumably, it won't be changing. Or, you could
> cross-check those hostnames and maybe change configuration or complain
> and log the user out in that event.
>
> Again, not much to do with Tomcat, which will just route all
> appropriate requests to your application.
>
>> Is there a reason for this situation that I should not do things
>> the way I suggest? but should use multiple "identical duplicate"
>> web sites (virtual hosts) apart from each of which being hard coded
>> to access a specific content store?
>
> For me, it always comes down to complexity. If you know you can do
> this with a webapp-per-domain, then that's certainly a possibility but
> you'll need more heap space for multiple web applications, and so you
> might not scale as well.
>
> On the other hand, you may have to significantly re-work your web
> application to be able to handle one-single-webapp that can
> auto-switch configuration based upon the client's server-hostname. If
> that's the case, then running a single-application represents more
> risk -- at least for now.
>
> If I were designing things from scratch and I knew I'd be supporting
> marge numbers of configurations, I'd go with the
> single-webapp-instance approach because it's more scalable.
>
> - -chris
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Re: Multiple domian names one web site different content

[Andrew Hardy]

Thank you do much Chris, I really appreciate your input and taking the time 
to respond.


Sent with AquaMail for Android
http://www.aqua-mail.com


On 4 March 2016 18:12:11 Christopher Schultz  
wrote:



-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Andrew,

On 3/4/16 7:44 AM, Andrew Hardy wrote:

New to web servers.


Welcome.


This may be a spring MVC question rather than tomcat, I'm not
sure.

I understand I can map multiple domains to a single ip address
using DNS.  I have read some stuff on how to set up multiple
virtual hosts on the same host (ip address) on tomcat which
requests can be diverted to depending on which domain name was used
to make the request.

Alternatively I am wondering about not having multiple virtual
hosts (which I am guessing would be more useful if there was
significant difference between between the sites) but have a single
site which has a single layout structure etc but serves up
specifically tailored content from a selected content store BASED
on the domain used to make the request.

Is this anything to do with tomcat or do I have to some how tell
which domain was used when the http session is begun and set which
content at that point using spring MVC.  Perhaps the (first)
request / session includes the domain used and I so need to access
that programatically?


You mean one single instance of the application that handles the
hostname of the request to make decisions? Sounds good, and doesn't
really involve Tomcat.

If you have a session contained in a single web application, you could
either store the initial server hostname in the session and use that
until the session ends, or you could always pull the hostname from
each incoming request. Presumably, it won't be changing. Or, you could
cross-check those hostnames and maybe change configuration or complain
and log the user out in that event.

Again, not much to do with Tomcat, which will just route all
appropriate requests to your application.


Is there a reason for this situation that I should not do things
the way I suggest? but should use multiple "identical duplicate"
web sites (virtual hosts) apart from each of which being hard coded
to access a specific content store?


For me, it always comes down to complexity. If you know you can do
this with a webapp-per-domain, then that's certainly a possibility but
you'll need more heap space for multiple web applications, and so you
might not scale as well.

On the other hand, you may have to significantly re-work your web
application to be able to handle one-single-webapp that can
auto-switch configuration based upon the client's server-hostname. If
that's the case, then running a single-application represents more
risk -- at least for now.

If I were designing things from scratch and I knew I'd be supporting
marge numbers of configurations, I'd go with the
single-webapp-instance approach because it's more scalable.

- -chris
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Re: Multiple domian names one web site different content

[Christopher Schultz]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Andrew,

On 3/4/16 7:44 AM, Andrew Hardy wrote:
> New to web servers.

Welcome.

> This may be a spring MVC question rather than tomcat, I'm not
> sure.
> 
> I understand I can map multiple domains to a single ip address
> using DNS.  I have read some stuff on how to set up multiple
> virtual hosts on the same host (ip address) on tomcat which
> requests can be diverted to depending on which domain name was used
> to make the request.
> 
> Alternatively I am wondering about not having multiple virtual
> hosts (which I am guessing would be more useful if there was
> significant difference between between the sites) but have a single
> site which has a single layout structure etc but serves up
> specifically tailored content from a selected content store BASED
> on the domain used to make the request.
> 
> Is this anything to do with tomcat or do I have to some how tell
> which domain was used when the http session is begun and set which
> content at that point using spring MVC.  Perhaps the (first)
> request / session includes the domain used and I so need to access
> that programatically?

You mean one single instance of the application that handles the
hostname of the request to make decisions? Sounds good, and doesn't
really involve Tomcat.

If you have a session contained in a single web application, you could
either store the initial server hostname in the session and use that
until the session ends, or you could always pull the hostname from
each incoming request. Presumably, it won't be changing. Or, you could
cross-check those hostnames and maybe change configuration or complain
and log the user out in that event.

Again, not much to do with Tomcat, which will just route all
appropriate requests to your application.

> Is there a reason for this situation that I should not do things
> the way I suggest? but should use multiple "identical duplicate"
> web sites (virtual hosts) apart from each of which being hard coded
> to access a specific content store?

For me, it always comes down to complexity. If you know you can do
this with a webapp-per-domain, then that's certainly a possibility but
you'll need more heap space for multiple web applications, and so you
might not scale as well.

On the other hand, you may have to significantly re-work your web
application to be able to handle one-single-webapp that can
auto-switch configuration based upon the client's server-hostname. If
that's the case, then running a single-application represents more
risk -- at least for now.

If I were designing things from scratch and I knew I'd be supporting
marge numbers of configurations, I'd go with the
single-webapp-instance approach because it's more scalable.

- -chris
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