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OpenFreeMap survived 100,000 requests per second I was about to post about how nice the last 10 months of OpenFreeMap have been. The architecture has really proven itself to be great, Cloudflare has agreed to sponsor the bandwidth, Hetzner servers are super stable as always,

serving tiles from Btrfs proved to be a great choice, nginx is amazing, and life is good. Then, out of the blue, I'm getting reports that some tiles are not loading, which normally means tile generation bugs, but not this time. I look into the nginx logs and see this:

2025/08/08 23:08:16 [crit] 1084275#1084275: *161914910 open() "/mnt/ofm/planet-20250730_001001_pt/tiles/8/138/83.pbf" failed (24: Too many open files) ... This is weird. I've never seen anything like this. I check nload, and it shows huge traffic.

Also to rate limit by a header (ie Referer) it requires cloudflare's Enterprise Advanced plan via the WAF dashboard. blog.cloudflare.com/advanced-rat...