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Prerequisites

The individual performing this installation has a bit of Linux experience.
Root access is available.
A working copy of NMIS (starting from an NMIS VM is a good idea, if you prefer to install it yourself see the NMIS 8 Installation Guide) on the same server that opTrend is being installed on.
An (evaluation) license for opTrend

NOTE: opTrend is currently in alpha.

Installation Steps

Download opTrend from the Opmantek website.
Copy the opTrend tarball to the server in question, using scp or sftp or similar. Make a record of where you put the tarball (likely root's home directory).

Become root and unpack the tarball:

# as root
cd /usr/local
# if the tarball was saved in a different location, adjust the ~ in the following command 
tar xzf ~/opTrend-Linux-x86_64-1.0.0.tgz
cd /usr/local/omk 
cp install/opCommon.nmis conf/
cp -r install/trend conf
cp install/users.dat conf/

opTrend is now unpacked into /usr/local/omk, and the default configuration files are in /usr/local/omk/conf, ready for your initial config adjustments.

Integrate opTrend with the web server
become root and run the following commands:

# as root
# non-debian:
cp /usr/local/omk/conf/04omk-proxy.conf /etc/httpd/conf.d/
apachectl restart
# debian/ubuntu:
cp /usr/local/omk/conf/04omk-proxy.conf /etc/apache2/conf.d/
/etc/init.d/apache2 restart

Note: If this step is not taken, then the opTrend web GUI will only be available on port 8042 and you'll need to adjust your web browser accordingly.

Adjust NMIS Access list to include opTrend

cd /usr/local/omk/
perl ./install/optrend_setup.pl setup=all

Make the opTrend service daemons start automatically with the system
become root, then run the following commands:

# as root
cd /usr/local/omk/install
cp omkd.init.d /etc/init.d/omkd
# non-debian:
chkconfig omkd on
# debian/ubuntu:
update-rc.d omkd defaults

Start the opTrend service daemons
become root, then run the following commands:
service omkd start

Setup the cron jobs to run data collections, create a file /etc/cron.d/optrend

# opTrend "collect"
*/5 * * * * root sleep 60;/usr/local/omk/bin/optrend.exe act=collect;
0 0 * * 0 root /usr/local/omk/bin/optrend.exe act=update

Test opTrend
open up a web browser, and point it to "http://<yourserverip>/omk/opTrend"; you will have to enter your license first, then you will see opTrend main dashboard.