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Upgrade to version 0.6.x

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.

Comparison of the structure

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.

Adjustments

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 ;-).

Upgrade scenario using NPCD

  1. planning the new setup
  2. perform test installation and acquaint oneself with the new system
  3. create backup of the old installation
  4. install PNP 0.6.x at /usr/local/pnp4nagios
  5. make install-config
  6. make install-webconf
  7. reload Apache
  8. test Apache-config
    1. call of /pnp4nagios has to report an empty perfdata directory
  9. create /usr/local/pnp4nagios/etc/npcd.cfg from npcd.cfg-sample
    1. check paths and adapt changes from 0.4.x if necessary
  10. adjust all paths in nagios.cfg to the new PNP installation
  11. adjust all paths in the command definitions
  12. stop npcd using /etc/init.d/npcd stop
  13. make install-init installs the new init script for npcd
  14. /etc/init.d/nagios stop
  15. copy /usr/local/nagios/share/perfdata to /usr/local/pnp4nagios/var/perfdata. Attention: check the permissions
  16. /etc/init.d/npcd start
  17. /etc/init.d/nagios start
pnp-0.6/upgrade.txt · Last modified: 2011/08/09 12:25 by Joerg Linge
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