Asynchronous Celery tasks that manipulate a MySQL/Galera database from a Django application can produce very interesting behavior when HAProxy is involved.

In a Ceph cluster, the frequent question, “how much space utilization overhead does my EC profile cause,” can be answered with very simple algebra.

When you are using functionality that is buried deep in the Linux kernel, ftrace can be extremely useful. Here are some suggestions on how to use it, using the example of tracing function calls from qemu-guest-agent.

What’s this about?

Recently I used, for the first time, libvirt’s functionality …

Command-line interfaces frequently produce output whose verbosity your users may want to be able to tweak. Here’s a nifty way to do that.

Here’s a nice way to initialize a CLI argument parser in Python, with arbitrary levels of subcommands.