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:


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).

Given a document like this, if you run:

cibadmin -Q | 
python graph-constraints.py -o cib.svg

You get a graph like this:

Nodes are colored by their tag (so, primitive, clone, etc).

Apache virtual host statistics

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 …

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