net.ipv4.tcp_max_tw_buckets=10

这个参数表示操作系统允许TIME_WAIT套接字数量的最大值， 如果超过这个数字，TIME_WAIT套接字将立刻被清除并打印警告信息。
该参数默认为 180000，过多的TIME_WAIT套接字会使Web服务器变慢。

node2:/root/test#sysctl -w net.ipv4.tcp_max_tw_buckets=10
net.ipv4.tcp_max_tw_buckets = 10

node2:/root#netstat -na | grep 8080 
tcp        0      0 192.168.137.3:46705         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46696         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46702         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46698         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46697         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46699         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46701         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46700         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46703         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46704         192.168.137.2:8080          TIME_WAIT   
node2:/root#netstat -na | grep 8080 
tcp        0      0 192.168.137.3:46705         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46696         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46702         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46698         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46697         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46699         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46701         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46700         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46703         192.168.137.2:8080          TIME_WAIT   
tcp        0      0 192.168.137.3:46704         192.168.137.2:8080          TIME_WAIT   
node2:/root#netstat -na | grep 8080 | wc -l
10

TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow
TCP: time wait bucket table overflow