Ken Bowen wrote:
[Feels like a newbie question, but I don't know the anwser.]
I have a web app (myapp) which has its context.xml in META-INF.
When I run it on a local vanilla Tomcat 6.0.18 (Apache download) with
the standard unzipped
server.xml, only one instance of myapp is started (as observed in
catalina.out).
I have a Tomcat 6.0.18 running on a CentOS 5 Linux on a remote hosting
service.
(Actually running in a Parallels virtual VPS.)
That system has two hosts in the server.xml (set up by the remote
hosting service) as follows:
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
</Host>
<Host appBase="webapps" name="mydomain.com" unpackWARs="true"
autoDeploy="true">
<Alias>www.mydomain.com</Alias>
<Alias>123.123.123.123</Alias>
</Host>
Note that they share the appBase.
When I drop myapp.war in webapps, and observe catalina.out, I see that
it is started twice.
I assume that this is the expected behavior?
And so then the question is: In a remote hosting setting like this,
what is the purpose
of the localhost Host: <Host name="localhost" ....> Do I need this at
all?
Maybe it was just cruft left lying around by the person who set things up?
It is the standard server.xml setting, and normally it is enough, because...
The first <Host> defined is the "default host". Any request that comes
in to this server on a part on which Tomcat is listening, and whose
"Host:" header does not match any other <Host name="..."> tag, will be
handled by that default host.
In other words, if you have only that first <Host> tag, then it will
handle all requests.
Because you have a second <Host> tag defined, now you have two (virtual)
hosts. Your Host #2 now matches all requests for "mydomain.com",
"www.mydomain.com" and "123.123.123.123".
Your first <Host> still matches all requests addresses to "localhost",
and all the ones not matched by your Host #2.
(Because it is still the default host).
To make a longer story shorter, just do this :
- remove the second <Host>
- add 3 aliases to the first "localhost" Host :
> <Alias>www.mydomain.com</Alias>
> <Alias>123.123.123.123</Alias>
<Alias>mydomain.com</Alias>
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