I installed nagios following this tutorial http://sharadchhetri.com/2014/02/08/install-and-configure-nagios-core-4-on-ubuntu-12-04-lts/
On starting nagios and apache2, and browsing to nagios admin portal, I saw errors like below
(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_ping)
(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_http)
(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_users)
If you install nagios 4 following this tutorial http://sharadchhetri.com/2014/02/08/install-and-configure-nagios-core-4-on-ubuntu-12-04-lts/", then your installation directory is /usr/local/nagios. On starting nagios and browsing to nagios admin portal, you could see the following errors
(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_ping
(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_users
(No output on stdout) stderr: execvp(/usr/local/nagios/libexec/check_http
This is how I fixed the above errors, Install plugins
sudo apt-get install nagios-plugins
This will install all plugins to /usr/lib/nagios/plugins directory.
Just copy all files starting with check_* to /usr/local/nagios/libexec.
cp /usr/lib/nagios/plugins/check_* /usr/local/nagios/libexec
or
sudo ln -s /usr/lib/nagios/plugins/check_* /usr/local/nagios/libexec/
and wait for nagios to reload/refresh browser window.
I prefer to install it from sources:
cd ~
curl -L -O http://nagios-plugins.org/download/nagios-plugins-2.2.1.tar.gz
tar zxf nagios-plugins-*.tar.gz
cd nagios-plugins-*
./configure --with-nagios-user=nagios --with-nagios-group=nagios --with-openssl
make
sudo make install
Hope, it'll be helpful.
The OP hasn't installed the necessary plugins.
Instructions to install plugins can be found from the official docs - just select the platform you are using and scroll down to the 'Installing The Nagios Plugins' section.
