Performance Tuning

# Increase file descriptors
sudo tee -a /etc/security/limits.conf << 'EOF'
* soft nofile 65535
* hard nofile 65535
EOF

# Apply immediately
ulimit -n 65535

# Verify
ulimit -n

# /etc/sysctl.conf
sudo tee -a /etc/sysctl.conf << 'EOF'
# TCP performance
net.core.somaxconn = 65535
net.ipv4.tcp_max_syn_backlog = 8192
net.core.netdev_max_backlog = 65535

# Connection tracking
net.netfilter.nf_conntrack_max = 1048576

# TCP tuning
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_tw_buckets = 1440000
net.ipv4.ip_local_port_range = 1024 65535

# Buffer sizes
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
EOF

# Apply settings
sudo sysctl -p