If a picture is worth a thousand words, then code that generates pictures from words is worth…uh, anyway, I wrote a script that produces dot output from Pacemaker start and colocation constraints:

https://github.com/larsks/pacemaker-tools/

You can pass this output to graphviz to create visualizations of your Pacemaker resource constraints.

The graph-constraints.py script in that repository consumes the output of cibadmin -Q and can produce output for either start constraints (-S, the default) or colocation constraints (-C).

As part of a project I’m working on I wanted to get a rough idea of the activity of the Apache virtual hosts on the system. I wasn’t able to find exactly what I wanted, so I refreshed my memory of curses to bring you vhoststats.

This tools reads an Apache log file (with support for arbitrary formats) and generates a dynamic bar chart showing the activity (in number of requests and bytes transferred) of hosts on the system. The output might look something like this (but with colors):