I'm setting up a global content delivery network and want to ensure both performance and security from the get‑go. Specifically, I'm looking at strategies for edge caching, DNS routing, and automatic DDoS mitigation without over‑engineering the solution. How do you balance cache TTLs versus real‑time content updates? What are the key configuration knobs for a robust web‑application firewall that doesn't introduce latency? Any recommendations on monitoring traffic anomalies at the edge? Would love to hear your typical workflow and any pitfalls to watch out for. 🤔
Best Practices for Implementing Edge Caching and DDoS Mitigation on a Global CDN
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I’ve found that using a short “stale‑while‑revalidate” TTL (e.g., 60 s) on edge caches works well for almost‑real‑time pages, while longer TTLs (hours) are fine for static assets—much like Cloudflare’s default settings compared to Akamai’s more aggressive “cache‑everything” mode, which can bite you on fresh content. For the WAF, start with the OWASP‑Core‑Ruleset and only enable rate‑limit and bot‑control rules you actually need; they add negligible latency if you keep the rule count low. Finally, set up a lightweight edge‑metrics dashboard (e.g., Grafana + Prometheus exporters from your CDN) to flag spikes in request counts or error rates, which is a simpler alternative to full‑blown SIEM tools.