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How to setup a OpenDap server.

This part describes how to setup an opendap server with hyrax under the centos 5 operating system.

Setup a server OS

To setup a centos system you can take a clean computer or a clean virtual machine (using for example vmware). Download centos burn a dvd and insert it into your computer. Follow the installation guide and setup the operating system. Any linux/unix system will be useable. If you want to work with windows you can best use cygwin to install linux compatible software.

Install required libraries & tools

Install subversion
(sudo) yum install subversion

The following libraries are required:

The following need c,c+,fortran (all prefered from the gcc (gcc, g+, gfortran). Make sure you have up to date versions of automake, autoconf, etc... (should be if you use a recent distribution). For these I usually install from source because there might be some options I need later, like --with-hdf, --with-dap or --with-netcdf-4

Install hyrax

To install Hyrax follow the Hyrax installation guide.


To configure Hyrax follow the Hyrax configuration guide


There are some alternative opendap servers you could use:

  • Thredds is a pure java based implementation. It's easier to setup and has some nice features which makes it easy to work with ensembles. I noticed some errors when querying large datasets if it does not have enough memory. The main difference with the hyrax server is the architecture. The hyrax server has a native (c++) backend which does the data input/output. I think hyrax is more efficient for large datasets but I haven't tested this properly.
  • Pydap is a pure python based implementation. I haven't tested this.
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