net.core.somaxconn

 /sbin/sysctl -w net.core.somaxconn=1024

一般设置：
1 sudo vi /etc/sysctl.conf 
在最下面编辑添加： 
net.ipv4.tcp_fin_timeout = 30 
net.ipv4.tcp_keepalive_time = 1200 
net.ipv4.route.gc_timeout = 100 
net.ipv4.ip_local_port_range = 1024 65000 
net.ipv4.tcp_tw_reuse = 1 
net.ipv4.tcp_tw_recycle = 1 
net.ipv4.tcp_syn_retries = 1 
net.ipv4.tcp_synack_retries = 1 
net.ipv4.tcp_max_syn_backlog = 262144 
net.core.netdev_max_backlog = 262144 
net.core.somaxconn = 262144 
net.ipv4.tcp_mem = 94500000 915000000 927000000 
保存退出 
2 sudo /sbin/sysctl -p