Hyrax GitHub Source Build

From OPeNDAP Documentation

This describes how to get and build Hyrax from our GitHub repositories. Hyrax is a data server that implements the DAP2 and DAP4 protocols, works with a number of different data formats and supports a wide variety of customization options from tailoring the look of the server's web pages to complex server-side processing operations. This page describes how to build the server's source code. If you're working on a Linux or OS/X computer, the process is similar so we describe only the linux case; we do not support building the server on Windows operating systems.

To build and install the server, you need to perform three steps:

  1. Set up the computer to build source code (Install a Java compiler; install a C/C++ compiler; add some other tools)
  2. Build the C++ DAP library (libdap4) and the Hyrax BES daemon
  3. Build the Hyrax OLFS web application

Quick links if you already know the process:

A semi-automatic build

Use git to clone the hyrax project and follow the short instructions in the README file. summarized here, those instructions are:

use bash
The shell scripts in this repo assume you are using bash.
set up some environment variables so the server will build an install locally, something that streamlines development
source spath.sh
clone the three code repos for the server plus the hyrax dependencies
./hyrax_clone.sh -v
build the code, including the dependencies
./hyrax_build.sh -v
test the server
Start the BES using besctl start
Start the OLFS using./build/apache-tomcat-7.0.57/bin/startup.sh
Test the server by loooking at http://localhost:8080/opendap in a browser. You should see a directory named data and following that link should lead to more data. The server will be accessible to clients other than a web browser.
To test the BES function independently of the front end, use bescmdln and give it the show version; command, you should see output about different components and their versions.
Use exit to leave the command line test client.

As described in the README file that is part of the hyrax repo, there are some other scripts in the repo and some options to the clone and build script that you can investigate by using -h (help).

The manual build

In the following, we describe only the build process for CentOS; the one for OS/X is similar and we note the differences where they are significant.

Prepare The System

Make a place to build the software

You need to make a new directory to build the server and set the environment variable prefix to be that directory name. Then export $prefix and add $prefix/bin to $PATH. I'll use hyrax-git for the new directory and assume you're using bash.

mkdir hyrax-git
cd hyrax-git

Configure the shell Environment

It is crucial that the shell environment have the variables prefix and PATH set correctly:

export prefix=`pwd`/build
export PATH=$prefix/deps/bin:$prefix/bin:$PATH

Set up a CentOS machine to build code

Note that I don't like clicking around to different pages to follow simple directions, so what follows is a short version of the CentOS 6 configuration information we've compiled for people that help us by building RPM packages for Hyrax. The complete instructions are in Configure CentOS and describe how to to set up a CentOS 6 machine to build software. What follows is the condensed version:

Load a basic software development environment
yum install java-1.7.0-openjdk java-1.7.0-openjdk-devel ant git gcc-c++ flex bison openssl-devel libuuid-devel readline-devel zlib-devel libjpeg-devel libxml2-devel curl-devel emacs
yum install autoconf automake libtool
On CentOS 7, you will also need: yum install bzip2-devel
Get the latest GNU autotools (but don't do this unless you need too)
Download, unpack, build and install:
build them (./configure; make; sudo make install - this should take no more than three minutes).

Compile the Hyrax dependencies

Use git to clone the hyrax-dependencies:

 git clone https://github.com/opendap/hyrax-dependencies

And then build it. Unlike many source packages, there is no need to run a configure script, just make will do. However, the Makefile in this package expects $prefix to be set as described above. It will put all of the Hyrax server dependencies in a subdirectory called deps.

(make sure you're in the directory set to $prefix)

git clone https://github.com/opendap/hyrax-dependencies
cd hyrax-dependencies
make --jobs=9
The --jobs=N runs a parallel build with at most N simultaneous compile operations. This will result in a huge performance improvement on multi-core machines. -jN is the short form for the option.
cd ..
Go back up to $prefix

Note: You can get some of the dependencies for Hyrax like netCDF from the EPEL repository, but the versions are often older than Hyrax needs. Contact us if you want information about using EPEL. At the risk of throwing people a curve ball, here's a synopsis of the process. Don't do this unless you know EPEL well. Use epel-release-6-8.noarch.rpm and install it using sudo yum install epel-release-6-8.noarch.rpm. Then install packages needed to read various file formats: yum install netcdf-devel hdf-devel hdf5-devel libicu-devel cfitsio-devel cppunit-devel rpm-devel rpm-build

Build libdap and the Hyrax BES daemon

Get and build libdap4

If you have libdap already, uninstall it before proceeding.

Build, test and install libdap4 into $prefix:

git clone https://github.com/opendap/libdap4
cd libdap4
autoreconf -fiv
./configure --prefix=$prefix --enable-developer
make -j9
make check -j9
make install
cd ..
Go back up to $prefix

Get and build the BES and all of the modules shipped with Hyrax

Build, test and install the BES and its modules

git clone https://github.com/opendap/bes
Clone the BES from GitHub
cd bes
git submodule update --init
This will clone some additional modules into the directory modules; you need to do this! (Previously it was an optional step). See git submodule for information about all you can do with git's submodule command. Also note that this does not checkout a particular branch for the submodules; the modules are left in the 'detached head' state. To checkout a particular branch like 'master', which is important if you'll be making changes to that code, use git submodule foreach 'git checkout master' .
autoreconf --force --install --verbose
You can use -fiv instead of the long options. These mean, when starting from a freshly cloned repo, run all of the autotools commands and install all of the needed scripts.
./configure --prefix=$prefix --with-dependencies=$prefix/deps --enable-developer
  • The --with-deps... is not needed if you load the dependencies from RPMs or otherwise have them installed an generally accessible on the build machine.
  • The --enable-developer option will compile in all of the debugging code which may affect performance even if the debugging output is not enabled.
make -j9
make check -j9
Some tests may fail and adding -k ignores that and keeps make marching along. Note that you must run make before make check in the bes code.
make install
cd ..
Go back up to $prefix

Test the BES

Start the BES and verify that all of the modules build correctly.

besctl start
Start the BES. Given that $prefix/bin is on your $PATH, this should start the BES. You will not need to be root if you used the --enable-developer switch with configure (as shown above), otherwise you should run sudo besctl start with the caveat that as root $prefix/bin will probably not be n your $PATH.
If there's an error (e.g., you tried to start as a regular user but need to be root), edit bes.conf to be a real user (yourself?) in a real group (use 'groups' to see which groups you are in) and also check that the bes.log file is not owned by root.
Now that the BES is running, start the BES testing tool
show version;
Send the BES the version command to see if it's running
Take a quick look at the output. There should be entries for libdap, bes and all of the modules.
Exit the testing tool

Note that even though you have exited the bescmdln test tool, the BES is still running. That's fine - we'll use it in just a bit - but if you want to shut it down, use besctl stop, or besctl pids to see the daemon's processes. If the BES is not stopping, besctl kill will stop all BES processes without waiting for them to complete their current task.

Build the Hyrax OLFS web application

The OLFS is a java servlet built using ant. The OLFS is a java servlet web application and runs with Tomcat, Glassfish, etc. You need a copy of Tomcat, but our servlet does not work with the RPM version of Tomcat. Get Tomcat 7 from Apache. Note that if you built the dependencies from source using the hyrac-dependencies-1.10.tar then there is a copy of Tomcat in the hyrax-dependecies/extra_downloads directory. You can unpack the Tomcat tar file in $prefix. I'll assume you have the Apache Tomcat tar file in $prefix.

tar -xzf apache-tomcat-7.0.57.tar.gz
Expand the Tomcat tar ball
git clone https://github.com/opendap/olfs
Get the OLFS source code
cd olfs
change directory to the OLFS source
ant server
Build it
cp build/dist/opendap.war ../apache-tomcat-7.0.57/webapps/
Copy the opendap web archive to the tomcat webapps direcotry.
cd ..
Go up to $prefix
Start Tomcat

Test the server

You can test the server several ways, but the most fun is to use a web browser. The URL http://<machine>:8080/opendap should return a page pointing to a collection of test datasets bundled with the server. You can also use curl, wget or any application that can read from OpenDAP servers (e.g., Matlab, Octave, ArcGIS, IDL, ...).

Stopping the server

Stop both the BES and Apache

besctl stop

Note that there is also a hyraxctl script that provides a way to start and stop Hyrax without you (or init.d) having to type separate commands for both the BES and OLFS. This script is part of the BES software you cloned from git.

Building select parts of the BES

Building just the BES and one of more of its handlers/modules is not at all hard to do with a checkout of code from git. In the above section on building the BES, simply skip the step where the submodules are cloned (git submodule update --init) and link configure.ac to configure_standard.ac. The rest of the process is as shown. The end result is a BES daemon without any of the standard Hyrax modules (but support for DAP will be built if libdap is found by the configure script).

To build modules for the BES, simply go to $prefix, clone their git repo and build them, taking care to pass set $prefix when calling the module's configure script.

Note that it is easy to combine the 'build it all' and 'build just one' processes so that a complete Hyrax BES can be built in one go and then a new module/handler not included in the BES git repo can be built and used. Each module we have on GitHub has a configure.ac, Makefile.am, etc., that will support both kinds of builds and Configuration of BES Modules explains how to take a module/handler that builds as a standalone module and tweak the build scripts so that it's fully integrated into the Hyrax BES build, too.