https://blog-dev.simpleenough.net/tags/cost-optimization/Recent content in Cost-Optimization on Simple Enough BlogHugoenMon, 01 Dec 2025 17:08:49 +0200https://blog-dev.simpleenough.net/blog/spotdecember/Mon, 01 Dec 2025 17:08:49 +0200https://blog-dev.simpleenough.net/blog/spotdecember/<h1 id="i-why-aws-spot-instances-become-impossible-to-get-in-december" class="heading">I. Why AWS Spot Instances Become Impossible to Get in December<a href="#i-why-aws-spot-instances-become-impossible-to-get-in-december" aria-labelledby="i-why-aws-spot-instances-become-impossible-to-get-in-december"> <!-- <i class="fas fa-link anchor"></i> --> <svg class="svg-inline--fa fas fa-link anchor" fill="currentColor" aria-hidden="true" role="img" viewBox="0 0 640 512"><use href="#fas-link"></use></svg>&nbsp; </a> </h1> <p><strong>EC2 Spot Instances</strong> are a fantastic way to save 50–70% on your AWS compute costs.<br> They use the unused capacity of AWS data centers… but in <strong>December</strong>, this unused capacity almost completely disappears.</p> <p>Result:</p> <ul> <li>Auto Scaling Groups fail to launch new instances</li> <li>deployments get stuck</li> <li>“insufficient capacity” everywhere</li> <li>Spot interruptions become much more frequent</li> </ul> <p>If you’ve experienced this, rest assured: it’s <strong>not your fault</strong>, and not a configuration issue.<br> It’s a <strong>seasonal phenomenon</strong>, and it happens every single year.</p>