Re: LAS 6.0 Installation

[Joe Wielgosz <joew@xxxxxxxxxxxxx>]

Here's yet another Joe's perspective.. Meant to send this to the list but it just went to Joe McLean..

I am totally new to LAS, MySQL, and Apache configuration, but I've
managed to get a LAS running here at COLA:

http://www.monsoondata.org:8080/las/servlets/dataset

I also had the empty document problem, and came to the same conclusion -
that mysqld wouldn't let Tomcat connect (even though it let the mysql
command line client in with the same parameters).

I found some revealing error messages in the various files in
$lasroot/las_servlet/jakarta/logs/.

You can try starting mysqld with "--skip-grant-tables" to turn off
authentication - that will tell you if it's the problem, although for
security reasons that's not a good permanent solution.

As for Tomcat and Apache - it looks like the LAS user interface for
building requests runs as a Java servlet in Tomcat, and retrieves data
from the MySQL database, whereas the data server which generates actual
output is a collection Perl CGI scripts that run in Apache, and seem to
just use XML files for configuration info (although maybe there are SQL
calls in there too..)

So you definitely need the Apache part. 

- Joe


On Wed, 2002-11-13 at 10:10, Joe McLean wrote:
> Hi Steve,
> comments below.
> 
> Steve Cousins wrote:
> 
> > I am trying to set up LAS 6.0 on a Redhat Linux 7.3 system.  I have
> > installed everything and the Tomcat server is running, however, using
> > Netscape 4.75 when I go
> > to:
> >         rocky.umeoce.maine.edu:8080/las6/servlets/dataset
> >
> > as the documentation states, I get a message box that comes up and says:
> >
> >         "The document contained no data. Try again later, or contact the
> > server's administrator."
> >
> > If I try it in Internet Explorer I just get a blank page.
> >
> > If I go to:
> >
> >         rocky.umeoce.maine.edu:8080
> >
> > I get the sample Tomcat home page.
> >
> > I am just trying to get LAS 6.0 to work with the included sample data sets
> > right now.  I ran make in the server directory and everything went well:
> >
> >         [root@rocky server]# make
> >         ../xml/perl/genLas.pl las.xml
> >         DB host: []
> >         DB login name: [root]
> >         DB password: []
> >         Serializing file:/usr2/local/src/las6/server/las.xml to database
> >         Building indexes...
> >         Resolving links...
> >         Using default catalog...
> >         Generating dataset COADS Climatology
> >         Generating dataset Levitus Climatology
> >
> > Any ideas on what could be wrong or where to look?
> >
> 
> I ran across a similar problem, and was informed that MySQL was configured so
> that host "localhost" and user "root" would not work together.  Instead, when
> I ran configure, I used the name of the computer as host.  I'm sorry I don't
> know enough to explain the details of MySQL, but try running configure again
> using  "rocky.umeoce.maine.edu" as MySQL host and see if that works.
> 
> >
> > One thing I don't understand is the interplay (if any) between the regular
> > Apache web server and the Tomcat server.  During the configuration process
> > it asked if it should check for a web server and it found apache running
> > and said "good".  It then gave me the two lines to add to the httpd.conf
> > file for that web server.  Does LAS 6.0 even use this web server?  If so,
> > how?
> >
> 
> LAS v6 does use both the Apache and Tomcat servers, the latter being used
> specifically as the Java Servlet container.  As far as the details go, I know
> as much about this as I do MySQL, someone else please take over.
> 
> >
> > Thanks,
> >
> > Steve
> > _____________________________________________________________
> >  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
> 
> Joe McLean
> 
> 
-- 
Joe Wielgosz / joew@cola.iges.org
---------------------------------------------------
Center for Ocean-Land-Atmosphere Studies (COLA)
Institute for Global Environment and Society (IGES)
http://www.iges.org