vi /etc/sysctl.conf

完整配置如下：

net.ipv4.tcp_syncookies = 1 
net.ipv4.tcp_tw_reuse = 1 
net.ipv4.tcp_tw_recycle = 1 
net.ipv4.ip_local_port_range = 1024 65000 
net.ipv4.tcp_max_tw_buckets = 50000 
net.ipv4.tcp_fin_timeout = 10 
net.ipv4.tcp_keepalive_time = 30 
net.ipv4.tcp_window_scaling = 0 
net.ipv4.tcp_sack = 0 
fs.file-max = 65536 
net.ipv4.tcp_max_syn_backlog = 65536 
net.core.netdev_max_backlog = 32768 
net.core.somaxconn = 32768 
net.core.wmem_default = 8388608 
net.core.rmem_default = 8388608 
net.core.rmem_max = 16777216 
net.core.wmem_max = 16777216 
net.ipv4.tcp_timestamps = 0 
net.ipv4.tcp_synack_retries = 2 
net.ipv4.tcp_syn_retries = 2 
net.ipv4.tcp_max_syn_backlog = 10240 
net.core.netdev_max_backlog = 51200 
net.ipv4.tcp_keepalive_probes = 5 
net.ipv4.tcp_keepalive_intvl = 15 
net.ipv4.tcp_retries2 = 5 
net.ipv4.tcp_orphan_retries = 3 
net.ipv4.tcp_reordering = 5 
net.ipv4.tcp_retrans_collapse = 0