https://alexos.dev/tags/sre/ Recent content in SRE on alexos.dev Hugo en-gb Sun, 29 Mar 2020 18:00:00 -0100 https://alexos.dev/2020/03/29/team-nimbus-and-the-agents-of-chaos/ Sun, 29 Mar 2020 18:00:00 -0100 https://alexos.dev/2020/03/29/team-nimbus-and-the-agents-of-chaos/ <p>This blog post is about my team&rsquo;s first ever Chaos Day - where we ran a series of experiments designed to test how our platform performed when we tried to disrupt it, or the workloads that run on it.</p> <blockquote> <p>This entry was originally <a href="https://medium.com/john-lewis-software-engineering/team-nimbus-and-the-agents-of-chaos-ab257e41fe36">posted on Medium</a> under my employer&rsquo;s publication.</p> </blockquote> <p>It was January 2020, and we had just gone through another Peak trading period - significant for a larger retailer. The Digital Platform had performed extremely well. There were no incidents, no last-minute panic scaling, and no fall-backs enabled — even though the number of services and overall complexity of the platform was significantly higher than this time last year. Not perhaps the backdrop to make a compelling case for running a series of complex operational test scenarios then? Well, we are not the sort to be resting on our laurels &hellip;</p>