Nagios 2.9 installation

If you want to install Nagios into VMware, please see the post about the VMware additions.

• Log in with root or use sudo
• Create a downloads folder : mkdir ~/downloads
• Download the tarball with "wget" : wget http://prdownload.sourceforge.net/nagios/nagios-2.9.tar.gz?download
• Create a "src" folder if necessary to put the nagios into in : mkdir /usr/local/src
• Extract the tarball into the "src" folder : tar xvfz ~/downloads/nagios-2.9.tar.gz
• groupadd -g 9000 nagios (Create the group nagios)
• groupadd -g 9001 nagcmd (Create the group nagcmd)
• useradd -u 9000 -g nagios -G nagioscmd -d /usr/local/nagios -c "Nagios Admin" nagios (Create the user nagios, member of nagios, nagioscmd, and home directory)
• Install the tools needed for the compilation : apt-get install build-essential
• Install the PNG, JPEG libraries : apt-get install libpng12-0 libpng12-dev libjpeg62 libjpeg62-dev
• Install the last GD library into the downloads diretory : wget http://www.libgd.org/releases/gd-2.0.35.tar.gz
• Uncompress the tarball : tar xvfz ~/downloads/gd-2.0.35.tar.gz
• ./configure in the GD directory
• make all
• make install
• Install Apache2 with apt-get install apache2
• You need to find the user for Apache2, you can do it with the following command : grep "^User" /etc/apache2/apache2.conf. Normally you will see www-data
• Add "www-data" to the "nagcmd" group : usermod -G nagcmd www-data
• Create the following directories : mkdir /usr/local/nagios /etc/nagios /var/nagios
• Change the owner of these directories : chown nagios.nagios /usr/local/nagios /etc/nagios /var/nagios
• Go to the source directory : ./configure --sysconfigdir=/etc/nagios --localstatedir=/var/nagios --with-command-groupe=nagcmd
• make all
• make install
• make install-init
• make install-commandmode
• make install-config
• Create symbolic link to run Nagios at the startup : ln -s /etc/init.d/nagios /etc/rc2.d/S99nagios
• Create symbolic link to stop Nagios : ln -s /etc/init.d/nagios /etc/rc2.d/K99nagios
• Repeat these steps for rc3 and rc5
• We need to install the plugings, download it into ~/downloads : wget http://downloads.sourceforge.net/nagiosplug/nagios-plugins-1.4.9.tar.gz
• Uncompress into the "src" folder : tar xvfz ~/downloads/nagios-plugins-1.4.9
• apt-get install fping
• apt-get install smbclient
• apt-get install libradius1 libradius1-dev
• apt-get install libldap2 libldap2-dev
• apt-get install libsnmp-base libsnmp9 libsnmp9-dev snmp
• apt-get install libssl-dev libssl0.9.8
• apt-get install postgresql-dev
• apt-get install mysql-client libmysql++-dev
• perl -MCPAN -e 'install Net::SNMP'
• ./configure --sysconfdir=/etc/nagios --localstatedir=/var/nagios

Some modules will no be installed as qstat and lmstat. To be honest, I don't want to monitor Quake servers and I don't know lmstat.

• make all
• make install

The plugin check_icmp must have the SUID bit to function correctly.

• chown root.nagios /usr/local/nagios/libexec/check_icmp
• chmod 4711 /usr/local/nagios/libexec/check_icmp
• Go to the /etc/apache2/conf.d
• Create the nagios.conf and follow the instructions from there http://nagios.sourceforge.net/docs/2_0/installweb.html
• Edit the cgi.cfg to use the authentication : use_authentication=1
• Create a .htaccess in the following directory /usr/local/nagios/sbin with the following content :
  AuthName "Nagios-Monitoring"
  AuthType Basic
  AuthUserFile /etc/nagios/htpasswd
  require valid-user
• In /etc/nagios : htpasswd -c htpasswd nagios
• Change the owner of the file to www-data : chown www-data.www.data htpasswd
• Give "rw" to the user www-data only : chmod 600 htpasswd