Nagios

Nagios is main monitoring tool for CLON cluster.

Download from web following files and place them to '/usr/local/downloads':

 nagios-2.6.tar.gz
 nagios-images_0.3.tar.gz
 nagios-plugins-1.4.5.tar.gz
 nagiosmib-1.0.0.tar.gz (?????????)

 create user 'nagios', private group 'nagios'
 mkdir /www/nagios2.6
 chown nagios.nagios /www/nagios2.6

Add command file group and put appropriate users in (we assume that apache is running as user 'apache'):

 /usr/sbin/groupadd nagcmd
 /usr/sbin/usermod -G nagcmd apache
 /usr/sbin/usermod -G nagcmd nagios
 to check, see file /etc/group

Build and install:

 cp /usr/local/downloads/nagios-2.6.tar.gz /usr/local/src
 cd /usr/local/src
 gunzip nagios-2.6.tar.gz
 tar xvf nagios-2.6.tar
 cd '/usr/local/src/nagios-2.6'
 su nagios
 ./configure --prefix=/www/nagios2.6 --with-cgiurl=/nagios/cgi-bin --with-htmurl=/nagios --with-nagios-user=nagios --with-nagios-group=nagios --with-command-group=nagcmd
 make all
 make install

Install init script /etc/rc.d/init.d/nagios:

 make install-init (as 'root' !!!)

 #to install sample /etc directory
 make install-config

 #???This installs and configures permissions on the
 #???directory for holding the external command file
 make install-commandmode

Plugins:

 cd /usr/local/src/nagios-plugins-1.4.5
 su nagios
 ./configure --prefix=/www/nagios2.6
 make
 make install

Extra plagins (nrpe):

 cd /usr/local/src/nrpe-2.6
 ./configure
 make all
 cp src/check_nrpe /www/nagios2.6/libexec
 chown nagios.nagios /www/nagios2.6/libexec/check_nrpe

 Create a command definition in your Nagios config
 file for the NRPE client.  See the README file for
 more info on doing this.

 NOTE: remote host(s) must be running the NRPE daemon !!!
    - Copy the nrpe daemon to /usr/sbin, /apps/nagios2.6
      or wherever you feel it fits best.
    - Copy the sample nrpe.cfg config file to /etc,
      /apps/nagios2.6 or wherever you feel it fits best.
    - Modify the /etc/services file and configure NRPE to
      run under inetd, xinetd, or as a standalone daemon.
      See the README file for more info on doing this.

Fix apache configuration file:

 add contents of /usr/local/src/nagios-2.6/sample-config/httpd.conf
 to /www/apache2.2.3/conf/httpd.conf

Copy 'etc' directory from old Nagios (if any) to /www/nagios2.6. Go through files cgi.cfg, nagios.cfg and private/* and fix pathes making them point to /www/nagios2.6.

Add several directories for output files:

 mkdir /www/nagios2.6/var/log
 mkdir /www/nagios2.6/var/run
 mkdir /www/nagios2.6/var/rw (?????)

Install icons:

 cd /usr/local/src/nagios-images-0.3/base
 cp * /www/nagios2.6/share/images/logos

To check configuration run following commands:

 /www/nagios2.6/bin/nagios -v /www/nagios2.6/etc/nagios.cfg

To start/stop

 /etc/init.d/nagios start/stop/restart

Add Nagios to services:

 chkconfig --add nagios
 chkconfig --level 3 nagios off
 chkconfig --level 4 nagios off
 chkconfig --list nagios