Casey Callendrello

Casey Callendrello is a technologist with an interest in networking, scalability, distributed computing, and security. He resides in Berlin, Germany.

Currently he is a Senior Staff engineer at Isovalent, newly acquired by Cisco. He is responsible, primarly, for the Network Policy team.

Previously he was a principal engineer at Red Hat, working on Kubernetes. He is also a maintainer of the CNI networking standard and plugin suite.

Even more previously, he worked at CoreOS (acquired by Red Hat), developing the rkt container runtime. He also was the backend architect at Weebly (since acquired by Square), where he designed serving, search, and data analysis infrastructure. Back when he was a wee lil’ programmer, he developed software for the Operations department at Akamai.


Localhost is special, part 1: vampire nodes
Jan 24, 2021 k8s
In which a subtle CRI-O bug breaks machines in a new and special way.
Using hack/run-locally with CRIO
Jan 20, 2021 k8s
How to run kubernetes locally with CRI-O


Introduction to CNI at KubeCon EU 2020
Aug 18, 2020 talks
Presentation about CNI for KubeCon EU 2020
Kubernetes and the CNI: Where we Are and What’s Next?
May 3, 2018 talks
Deep-dive into CNI and Kubernetes networking for KubeCon EU 2018.
Golang, Threads, and You
Nov 1, 2017 talks
Some low-level go runtime shenanigans I presented at the November 2017 Berlin Golang meetup.
New Journeys in rkt’s Stages
Jan 1, 2017 talks
Presentation for the January, 2017 Berlin CoreOS meetup. Interesting from a historical perspective.


OpenStreetMaps for kids
Apr 18, 2024 hacks
Using OpenStreetMaps to generate kid-oriented maps
Creating letterpress type with a 3d-printer
Feb 14, 2015 hacks
3d-printed printing plates: not as terrible as you might expect!
Decoding MUNI telemetry with GnuRadio
Nov 9, 2014 hacks
My failed attempt to decode what should be an obvious AFSK stream.
Configuring a TOR-ified wireless network
Jun 8, 2014 hacks

This is a guide to configuring a wireless network that transparently directs all traffic over Tor.

SF Whiteboards
Sep 11, 2012 hacks
In which we discover that San Francisco streetsign posts are the perfect size for… augmentation.
Code Cards (Christmas 2011)
Dec 12, 2011 hacks
nerdy christmas cards (sorry).


Muni countdown timer
Nov 10, 2013 hardware
IOT before it was cool - a countdown timer for the MUNI.
The Lazer Blazer
Sep 14, 2012 hardware
A blinking LED blazer for Noisebridge’s birthday party.


Jacob Appelbaum’s May 9th Visit to Stammtisch
May 12, 2017 personal
A commentary on communities, abuse, and direct action.