vim /etc/sysctl.conf
#修改参数如下：
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp_max_syn_backlog = 16384
net.core.somaxconn = 65535

net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_syncookies = 1