カーネルパラメータ

/etc/sysctl.conf

net.core.somaxconn = 16384
net.core.netdev_max_backlog = 32768
net.ipv4.tcp_max_syn_backlog = 16384
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
net.ipv4.tcp_fastopen = 3
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_no_metrics_save = 1
net.ipv4.tcp_rfc1337 = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_keepalive_time = 10
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl = 3
net.ipv4.ip_local_port_range = 1024 65000

再起動

sudo shutdown -r now

反映確認

sudo sysctl -a | grep ...