The web-frontend has been completely rewritten and is now based on the PHP MVC framework Kohana. This leads to changed dependencies which must be checked prior to installation.
Note: At first an upgrade is like a new installation. Afterwards some changes should be made which are described further down.
Without specifying any options during ./configure PNP 0.4.x was installed below an existing Nagios-Installation at /usr/local/nagios.
Without specifying any options during ./configure PNP 0.6.x will be installed in a separate directory at /usr/local/pnp4nagios, i.e. it should be viewed as an independent application.
Note: It is sufficient to copy the *.rrd files from the old to the new location. They contain the data The *.xml files are recreated every time new performance data arrives as they contain meta information. The internal structure of the xml files has changed so you wouldn't be able to use them either way.
Summary of a PNP 0.4.14 installation
./configure
...
*** Configuration summary for pnp 0.4.14 05-02-2009 ***
General Options:
------------------------- -------------------
Nagios user/group: nagios nagios
Install directory: /usr/local/nagios
HTML Dir: /usr/local/nagios/share/pnp
Config Dir: /usr/local/nagios/etc/pnp
Location of rrdtool binary: /usr/bin/rrdtool Version 1.3.1
RRDs Perl Modules: FOUND (Version 1.3001)
RRD Files stored in: /usr/local/nagios/share/perfdata
process_perfdata.pl Logfile: /usr/local/nagios/var/perfdata.log
Perfdata files (NPCD) stored in: /usr/local/nagios/var/spool/perfdata/
Summary of a PNP 0.6.0 installation
./configure
...
*** Configuration summary for pnp4nagios-0.6.0 07-30-2009 ***
General Options:
------------------------- -------------------
Nagios user/group: nagios nagios
Install directory: /usr/local/pnp4nagios
HTML Dir: /usr/local/pnp4nagios/share
Config Dir: /usr/local/pnp4nagios/etc
Location of rrdtool binary: /usr/bin/rrdtool Version 1.3.1
RRDs Perl Modules: FOUND (Version 1.3001)
RRD Files stored in: /usr/local/pnp4nagios/var/perfdata
process_perfdata.pl Logfile: /usr/local/pnp4nagios/var/perfdata.log
Perfdata files (NPCD) stored in: /usr/local/pnp4nagios/var/spool
Web Interface Options: ------------------------- -------------------
HTML URL: http://localhost/pnp4nagios/
Apache Config File: /etc/apache2/conf.d/pnp4nagios.conf
Looking at these lines result in the parameters to be changed and the upgrade strategy.
The templates of the action_url definitions have changed. Instead of ”/nagios/pnp” the URL should be ”/pnp4nagios” and instead of “index.php” now “graph” will be used.
define host {
name host-pnp
register 0
action_url /pnp4nagios/graph?host=$HOSTNAME$
}
define service {
name srv-pnp
register 0
action_url /pnp4nagios/graph?host=$HOSTNAME$&srv=$SERVICEDESC$
}
The definitions for the preview popup function are similar
define host {
name host-pnp
action_url /pnp4nagios/index.php/graph?host=$HOSTNAME$&srv=_HOST_' class='tips' rel='/pnp4nagios/index.php/popup?host=$HOSTNAME$&srv=_HOST_
register 0
}
define service {
name srv-pnp
action_url /pnp4nagios/graph?host=$HOSTNAME$&srv=$SERVICEDESC$' class='tips' rel='/pnp4nagios/popup?host=$HOSTNAME$&srv=$SERVICEDESC$
register 0
}
Attention: It is not an error that the strings in front and after “class” contain only one quote.
Other than described in the 0.4.x documentation these templates can be used for Nagios 2.x and 3.x.
The variables in the files in the templates folder have to be initialised before first use. Example
$lower = ""
Earlier you were able to append to variables which weren't initialised before first use. Example:
foreach ($DS as $i) {
$def[1] .= "DEF:var$i=$rrdfile:$DS[$i]:AVERAGE " ;
Now you have to change that to
$def[1] = "";
foreach ($DS as $i) {
$def[1] .= "DEF:var$i=$rrdfile:$DS[$i]:AVERAGE " ;
Constants in template files don't work anymore, so that they have to be converted to variables.
define("_WARNRULE", '#FFFF00');
may be changed to
$WARNRULE = '#FFFF00';
Please keep in mind that all occurrences have to be changed 
.