https://thedavidpage.pages.dev/tags/kubernetes/Recent content in Kubernetes on The David PageHugo -- gohugo.ioenWed, 14 Jan 2026 09:00:00 +0700https://thedavidpage.pages.dev/posts/cloud/aws/networking/cross-az-data-transfer-cost/Wed, 14 Jan 2026 09:00:00 +0700https://thedavidpage.pages.dev/posts/cloud/aws/networking/cross-az-data-transfer-cost/<p><strong>Multi-AZ for high availability quietly turned into a network bill bigger than the compute bill — here&rsquo;s why.</strong></p> <p>Hi everyone 👋</p> <p>This is one of those &ldquo;hidden landmines&rdquo; on AWS: things that never throw a clear error, never show up in a StackOverflow top answer, but can quietly make a system flaky or burn thousands of dollars a month. First up: cross-AZ data transfer.</p> <h2 id="-the-assumption-that-gets-everyone">😱 The assumption that gets everyone</h2> <p>Everyone knows data transfer <em>out to the internet</em> costs money. Far fewer people realize that <strong>traffic between Availability Zones inside the same Region isn&rsquo;t free either</strong> — a lot of us assume &ldquo;it&rsquo;s all internal, so it&rsquo;s free.&rdquo;</p>