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幫助中心 > 技術(shù)知識庫 > 網(wǎng)站相關(guān) > 網(wǎng)站運營(yíng) > 發(fā)現大量的TIME_WAIT解決辦法

發(fā)現大量的TIME_WAIT解決辦法

2017-02-02 22:13:14 12826

發(fā)現大量的TIME_WAIT解決辦法

網(wǎng)站都打不開(kāi)，登陸數據庫服務(wù)器(windows)，發(fā)現很卡,于是重啟了?服務(wù)器，進(jìn)入系統后，沒(méi)過(guò)一會(huì )問(wèn)題依舊,查看了下系統進(jìn)程，發(fā)現mysql占用率達到99%，可以肯定的是mysql連接出現問(wèn)題:

netstat -an

192.168.12.13:3306 192.168.12.12:30443 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30444 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30445 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30446 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30447 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30448 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30449 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30450 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30451 TIME_WAIT

192.168.12.13:3306 192.168.12.12:30452 TIME_WAIT

... ...

根據TCP協(xié)議定義的3次握手斷開(kāi)連接規定,發(fā)起socket主動(dòng)關(guān)閉的一方 socket將進(jìn)入TIME_WAIT狀態(tài),TIME_WAIT狀態(tài)將持續2個(gè)MSL(Max Segment Lifetime),在Windows下默認為4分鐘,即240秒,TIME_WAIT狀態(tài)下的socket不能被回收使用. 具體現象是對于一個(gè)處理大量短連接的服務(wù)器,如果是由服務(wù)器主動(dòng)關(guān)閉客戶(hù)端的連接,將導致服務(wù)器端存在大量的處于TIME_WAIT狀態(tài)的socket, 甚至比處于Established狀態(tài)下的socket多的多,嚴重影響服務(wù)器的處理能力,甚至耗盡可用?socket,停止服務(wù). TIME_WAIT是TCP協(xié)議用以保證被重新分配的socket不會(huì )受到之前殘留的延遲重發(fā)報文影響的機制,是必要的邏輯保證.

在HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters,添加名為T(mén)cpTimedWaitDelay的

DWORD鍵,設置為60,以縮短TIME_WAIT的等待時(shí)間

登陸到web服務(wù)器(linux)：

netstat -ae |grep mysql

tcp 0 0 aaaa:53045 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53044 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53051 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53050 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53049 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53048 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53055 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53054 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53053 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53052 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53059 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53058 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53057 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53056 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53063 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53062 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53061 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53060 192.168.12.3:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53067 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53066 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53065 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53064 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa53071 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53070 192.168.12.13:mysql TIME_WAIT root 0

tcp 0 0 aaaa:53069 192.168.12.13:mysql TIME_WAIT root 0

發(fā)現系統存在大量TIME_WAIT狀態(tài)的連接，通過(guò)調整內核參數解決，

vi /etc/sysctl.conf

編輯文件，加入以下內容：

net.ipv4.tcp_syncookies = 1

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_fin_timeout = 30

然后執行 /sbin/sysctl -p 讓參數生效。

net.ipv4.tcp_syncookies = 1 表示開(kāi)啟SYN Cookies。當出現SYN等待隊列溢出時(shí)，啟用cookies來(lái)處理，可防范少量SYN攻擊，默認為0，表示關(guān)閉；

net.ipv4.tcp_tw_reuse = 1 表示開(kāi)啟重用。允許將TIME-WAIT sockets重新用于新的TCP連接，默認為0，表示關(guān)閉；

net.ipv4.tcp_tw_recycle = 1 表示開(kāi)啟TCP連接中TIME-WAIT sockets的快速回收，默認為0，表示關(guān)閉。

net.ipv4.tcp_fin_timeout 修改系統默認的 TIMEOUT 時(shí)間

修改之后，再用

netstat -ae|grep mysql

tcp 0 0 aaaa:50408 192.168.12.13:mysql ESTABLISHED nobody 3224651

tcp 0 0 aaaa:50417 192.168.12.13:mysql ESTABLISHED nobody 3224673

tcp 0 0 aaaa:50419 192.168.12.13:mysql ESTABLISHED nobody 3224675

發(fā)現大量的TIME_WAIT 已不存在，mysql進(jìn)程的占用率很快就降下來(lái)的，各網(wǎng)站訪(fǎng)問(wèn)正常。

提交成功！非常感謝您的反饋，我們會(huì )繼續努力做到更好！

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<div   id="y0yzgsp"   class="phone">
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