QNotifier seems to be a cool application that can report changes that may impact the performance of your Linux server right to your iPhone. If for example, the apache daemon goes down, QNotifier can be configured to notify you of this.
Installing QNotifier is a little tricky as the installation instructions are very brief.
the following commands will get QNotifier running on your Debian system. I assume this will most likely also run on Ubuntu.
apt-get install ruby ruby1.8-dev libzlib-ruby rdoc irb libopenssl-ruby rubygens
Install the update to Rubygens.
gem install rubygems-update
Update ruby dependencies for Qnotifier.
gem install hoe rexical racc rubyforge nokogiri archive-tar-minitar sup rails –include-dependencies
Install the QNotifier package.
gem install qnotifier
Run the package to set it up. Get the registration key from the iPhone.
There are configuration files that can be tweeked to make the package report different information and these config packages are refereced in the short installation guide available from the QNotifier package after you install it to your iPhone.