AWS VPC CNI Was Holding 71% of Our Subnet IPs Hostage
One of our production subnets sat at 99% IP utilization. The IPs were there, just held hostage by the VPC CNI's defaults.
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networking
The Database Connection Setting That Silently Throttles Your Writes
Part 3 of the Scaling CouchDB to 1 Million Requests Per Minute series - A config line about connection counts pinned our TCP receive window to 8,192 bytes, turning a single write into thousands of round trips.
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