Seamlessly upgrading a production OpenStack cluster in 4 hours : with 2k lines shell script

tl;dr: To the question: “what does it take to upgrade OpenStack”, my personal answer is: less than 2K lines of dash script. I’ll here describe its internals, and why I believe it is the correct solution. Why writing this blog post During FOSSDEM 2024, I was asked “how to you handle upgrades”. I answered with […]