Kernel Parameter Tuning for Production

Fix connection drops under load by tuning kernel networking parameters.

A advanced Linux challenge worth 20 points. Solve it hands-on in a real Linux environment in your browser - no local setup, no fake shells.

The Challenge

An API at 10k req/s is dropping connections. ss -s shows thousands in SYN_RECV — the accept queue is overflowing because somaxconn is at default (128).

Your tasks:

• Check current: sysctl net.core.somaxconn
• Apply live: sysctl -w net.core.somaxconn=65535 (or write directly to /proc/sys/)
• Apply live: sysctl -w net.ipv4.tcp_max_syn_backlog=65535
• Apply live: sysctl -w net.ipv4.tcp_tw_reuse=1
• Apply live: sysctl -w vm.swappiness=10
• Persist all four to /etc/sysctl.d/99-prod.conf
• Verify: sysctl -p /etc/sysctl.d/99-prod.conf
• Run check to validate