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Re: LAS 6.0 Installation

Hi Joe,

Thanks for the Proxy tips.  I finally got it set up to my liking.  I used
the Proxy settings as well as a redirect.  The Proxy is set up like you
suggested so:

	rocky.umeoce.maine.edu/las6 ->	rocky.umeoce.maine.edu:8080/las6

then I put an index.html file in
/usr/local/src/las6/las_servlet/jakarta/webapps/las6 directory with a META
REFRESH to go to rocky.umeoce.maine.edu/las6/servlets/dataset.  I tried
putting this in the Proxy settings but I guess it only likes to send it to
a directory, not a file.

Thanks everyone.


 Steve Cousins                 Email: cousins@umit.maine.edu
 Research Associate            Phone: (207) 581-4302
 Ocean Modeling Group
 School of Marine Sciences     208 Libby Hall
 University of Maine           Orono, Maine 04469

On Wed, 13 Nov 2002, Joe Sirott wrote:

> First, answers to Steve C's questions:
> >Since later on in the configure script it does correctly get your fully
> >qualified hostname, would it not be better for the script to use this as
> >the default for the MySQL configuration too?
> I agree with you. We only discovered the configuration problem after the 
> current version of LAS shipped (my RedHat 7.3 happens to be configured 
> correctly so the problem doesn't occur there). It will be in the next 
> release of LAS.
> >I'm still confused about if Apache is or should be used at all. It seems
> >that all of the functionality is through the Tomcat server so all I'd be
> >using the Apache server to do is to redirect to port 8080. If I want the
> >LAS 6.0 URL to be :
> >http://rocky.umeoce.maine.edu/las6
> >then I'm thinking that I'd just create the las6 directory and put an
> >index.html that contains a META Redirect to the port 8080 server at:
> >http://rocky.umeoce.maine.edu:8080/las6/servlets/dataset
> >This would just make it easier for people to remember the URL and type it
> >in.
> >Is this what the recommended setup is?
> Apache is required for the LAS data server (see below).
> If you don't want users to have to remember the Tomcat server port, you 
> might want to configure your Apache server as a proxy (rather than 
> configuring a META redirect). To the user it will appear as though the 
> accessing the UI server on the normal HTTP port. Try something like this in 
> your Apache config file:
> Add the following if not already included in your Apache config file:
> AddModule mod_proxy.c
> ProxyRequests on
> And then, for your example:
> ProxyPass /las6/ http://rocky.umeoce.main.edu:8080/las6/
> ProxyPassReverse /las6/ http://rocky.umeoce.main.edu:8080/las6/
> After a server restart, you should be able to access the server as:
> http://rocky.umeonce.main.edu/las6/servlets/dataset
> Finally, for those that are interested in the architecture, here are the 
> gory details:
> LAS is really two servers -- a user interface (UI) server and a data 
> server. The user interface server is written in Java as a servlet and uses 
> the Tomcat server. The data server uses the Apache server, is written in 
> Perl, and runs as a CGI script. The separation of the UI and data server 
> allows users to (relatively) easily create "sister servers" -- servers 
> where a UI on one machine can access multiple LAS data servers residing on 
> other machines. Cartoons of the LAS architecture are shipped as part of the 
> LAS distribution (in las\doc\diagrams\lasBlockExplanation.html).
> Both the LAS UI server and the LAS data server access the MySQL server. My 
> original design for LAS had the servers directly accessing the XML 
> configuration info, but this didn't scale very well. In the current design, 
> when genLas.pl is run the XML configuration files are serialized to the 
> database, and the UI and data servers then access only the database, not 
> the XML files. This turns out to be much faster.

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