故障： TCP time wait bucket table overflow

璐璐

故障： TCP: time wait bucket table overflow

现象：TOMCAT服务器对外提供的服务，高峰时出现间歇性的问题，性能尖刺现象明显。

vi /var/log/messages 中出现很多 TCP: time wait bucket table overflow

查看配置

1. <span style='font-family: 宋体; font-size: 10.5pt; mso-spacerun: "yes"; mso-font-kerning: 1.0000pt; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri;'><p style="margin: 0pt;"><span style='font-family: 宋体; font-size: 10.5pt; mso-spacerun: "yes"; mso-font-kerning: 1.0000pt; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri;'> </span></p><p style="margin: 0pt;"><span style='font-family: 宋体; font-size: 10.5pt; mso-spacerun: "yes"; mso-font-kerning: 1.0000pt; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri;'> cat /proc/sys/net/ipv4/tcp_max_tw_buckets</span></p><p style="margin: 0pt;"><span style='font-family: 宋体; font-size: 10.5pt; mso-spacerun: "yes"; mso-font-kerning: 1.0000pt; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri;'> </span></p><p style="margin: 0pt;"><span style='font-family: 宋体; font-size: 10.5pt; mso-spacerun: "yes"; mso-font-kerning: 1.0000pt; mso-bidi-font-family: "Times New Roman"; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri;'>3000</span></p></span><p style="margin: 0pt;">
   
2. </p>

复制代码

修改

1. echo 20000 > /proc/sys/net/ipv4/tcp_max_tw_buckets
   

复制代码

以上是临时解决，重启后会丢这个配置。所以还要写到配置文件中

修改配置文件：

1. vi /etc/sysctl.conf
   
2. 
   
3. 
   
4. 
   
5. net.ipv4.tcp_max_tw_buckets = 20000

复制代码