time_wait 过多 造成网络慢 实战

sh-3.2# scripts]# netstat -an|awk '/tcp/ {++S[$NF]}END {for (a in S) print a,S[a]}'
TIME_WAIT 33
ESTABLISHED 70
LISTEN 13

sh-3.2# 5 scripts]# cat /etc/sysctl.conf|awk '/net.ipv4.tcp_syncookies|net.ipv4.tcp_tw_reuse|net.ipv4.tcp_tw_recycle|net.ipv4.tcp_fin_timeout/'
net.ipv4.tcp_syncookies = 1

可见上面的/proc/sys/net/ipv4相关参数并没有设置：

修改如下：

[root@Salt85 scripts]# cat /etc/sysctl.conf|awk '/net.ipv4.tcp_syncookies|net.ipv4.tcp_tw_reuse|net.ipv4.tcp_tw_recycle|net.ipv4.tcp_fin_timeout/'
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 30

[root@Salt85 scripts]# netstat -an|awk '/tcp/ {++S[$NF]}END {for (a in S) print a,S[a]}'
TIME_WAIT 1
ESTABLISHED 71
LISTEN 13

解决TIME_WAITE过多的问题