Hyrax Installation and Customization ESIP ‘08 Summer Meeting Best Practices in Services and Data Interoperability Dan Holloway James Gallagher

Outline Hyrax Architecture Example Configuration of Hyrax Hyrax Customization

Hyrax Architecture Two (or more) cooperating processes: –Front-end provides DAP interface –Back-end(s) read(s) data Both parts can be customized –Front-end: different network protocols –Back-end: different data formats/systems N-Tier design is flexible, secure OLFSBES Data

OLFS Java Servlet Engine BES Unix Daemon BES Commands XML- encapsulated object File system with data files, SQL Database, … DAP2 THREDDS HTML Optional THREDDS catalogs Hyrax Architecture

Hyrax Architecture Summary Hyrax can be installed on one machine or several Installation security merits serious consideration Authentication & Authorization are handled by the web servers (Tomcat and Apache)

Hands on: Hyrax Configuration Choices: –Single or Multiple machine –Single or Multiple back-end servers –Tomcat or Apache web server –Data formats –Catalog customization –Security Testing –Command line tools for system administrators –Web browser

ESIP Workshop Configuration Run a single BES and the OLFS on one host (the virtual machine running SLAX Linux) Use Tomcat running on port 8080 Data formats: NetCDF and FreeForm No custom THREDDS catalog No firewall

ESIP Hardware SLAX Linux VMware Virtual Appliance All the software needed has been built, installed and configured Start the virtual machine now…

Starting the Virtual Machine Insert the CD-ROM Drag the opendap_vm and Wintools folders to the Windows desktop Copy the ISO image from the CD ROM to the harddisk (in a command window, mkdir C:\SLAX and then use copy or dd to copy the iso to the new directory). –The dd command is in the Wintools folder –The C:\SLAX directory is coded into the virtual machine; use Vmware Workstation/Fusion to edit Open the opendap_vm folder and double click on the opendap_vm.vmx virtual machine configuration file or start VMware Player/Workstation/Fusion and open opendap_vm.vmx from there. The virtual host will boot and the SLAX (slackware Linux with KDE) desktop will appear.

Installing the Software Already present on the virtual machine But, if it wasn’t, you’d go to the OPeNDAP web site* and download: –Binaries or source for the BES and the data handlers needed. –Get the OLFS web archive file (which is a compiled java servlet). –You also need the Tomcat servlet engine *

Location of Server Files on the Virtual Machine On your virtual machine: –The Tomcat servlet engine is in /usr/local/javadev/apache/tomcat (this is the value of $CATALINA_HOME ) –The BES, data handlers and related source files are in /usr/local/src. The BES has been built and installed in /usr/local/ ($prefix) –The OLFS web archive file is $CATALINA_HOME/webapps/opendap.war –BES: bes.conf, found at $prefix/etc/bes/bes.conf –OLFS: olfs.xml and catalog.xml, found at $CATALINA_HOME/content/opendap

Background: Starting the Server Start the BES (back-end data processing component) Use bescmdln to verify it’s working Start Tomcat: This automatically starts all installed servlets –Servlets are installed by copying the.war file to the servlet’s webapps directory Verify it’s working using a web browser

Start the BES

Verify the BES is running

Start Tomcat & the OLFS Typical steps: –Unpack the olfs jar-file –Copy the opendap.war file to Tomcat’s webapps directory –Start Tomcat Since all but the last step has been done already, start Tomcat: –/usr/local/javadev/apache-tomcat /bin/startup.sh

…terminal view

Verify Tomcat is running

…and Hyrax

Complete the Configuration Steps you would typically perform: –Security: Set up a firewall! Limit access to port to this host only –Custom catalogs: Edit the catalog.xml configuration file. By default automatic catalogs are generated –Logging: Edit the log4j.xml file. By default all accesses are logged

Stopping Hyrax First, stop Tomcat using ‘shutdown.sh’ …then stop the BES using ‘besctl’

Hyrax Configuration Summary For our chosen configuration, we used only Tomcat, plus the Hyrax web application which consists of the BES and the OLFS The tools bescmdln, getdap and a web browser were used to test the installation There are a lot of options, but the default settings produce a working server Security is a must for a web application; use a firewall to isolate the BES so only the local host can connect to it.