PhpSysInfo is an awesome PHP script that displays system and other monitoring information for Linux. phpSysInfo pulls data from /proc and other locations to display on an easy to read page.
On Ubuntu or Debian, install phpsysinfo with:
$ sudo apt-get install phpsysinfo
The config file is then located in:
Debian / Ubuntu Security concern:
Note that on Debian/Ubuntu installing this package automatically creates a symlink under /var/www/phpsysinfo pointing to /usr/share/phpsysinfo! Visitng http://ipaddress/phpsysinfo should show your page.
This can be further restricted by removing that symlink:
$ sudo rm /var/www/phpsysinfo
And then creating a proper config file such as this which allows localhost access only:
$ sudo nano /etc/apache2/conf.d/phpsysinfo.conf
Alias /phpsysinfo /usr/share/phpsysinfo
Deny from all
Allow from localhost