{"id":50484,"date":"2023-02-04T15:15:11","date_gmt":"2023-05-14T12:39:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%a8%e9%83%a8%e9%83%bd%e6%98%aftime_wait%e7%9a%84%e5%8e%9f%e5%9b%a0%ef%bc%81\/"},"modified":"2024-04-29T13:06:23","modified_gmt":"2024-04-29T05:06:23","slug":"%e5%85%a8%e9%83%a8%e9%83%bd%e6%98%aftime_wait%e7%9a%84%e5%8e%9f%e5%9b%a0%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%a8%e9%83%a8%e9%83%bd%e6%98%aftime_wait%e7%9a%84%e5%8e%9f%e5%9b%a0%ef%bc%81\/","title":{"rendered":"\u5168\u90e8\u90fd\u662fTIME_WAIT\u7684\u539f\u56e0\uff01"},"content":{"rendered":"<h1>\u5b66\u4e1a\u4efb\u52a1<\/h1>\n<p>\u5982\u679c\u7a81\u7136\u8bf4\u4f1a\u6709\u9ad8\u6d41\u91cf\u7684\u4fc3\u9500\u6d3b\u52a8\u4e4b\u7c7b\u7684\u5230\u6765\uff0c\u867d\u7136\u4f1a\u9047\u5230\u4e00\u4e9b\u56f0\u96be\uff0c\u4f46\u73b0\u5728\u662f\u4e91\u65f6\u4ee3\uff0c\u53ea\u8981\u63d0\u5347\u4e00\u4e0b\u786c\u4ef6\u914d\u7f6e\u5e94\u8be5\u5c31\u80fd\u89e3\u51b3\u3002\u6240\u4ee5\u6211\u5148\u52a0\u5927\u4e86CPU\u548c\u5185\u5b58\uff0c\u4f46\u662f\u4e00\u65e6\u6d3b\u52a8\u5f00\u59cb\uff0c\u5374\u610f\u5916\u5730\u5f88\u5feb\u5c31\u65e0\u6cd5\u4ece\u6d4f\u89c8\u5668\u8fde\u63a5\u4e0a\uff01<\/p>\n<p>CPU\u548c\u5185\u5b58\u8d1f\u8f7d\u90fd\u5e76\u4e0d\u662f\u7279\u522b\u9ad8\u3002\u5f53\u6211\u67e5\u770b\u4e86\u4e00\u4e0b\u53d1\u73b0\u6709\u5927\u91cf\u7684TIME_WAIT\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"graph 3.png\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d91e4913a08637a6e0e2b\/3-0.png\" alt=\"graph 3.png\" \/><\/div>\n<h1>\u6682\u65f6\u60f3\u529e\u6cd5\u89e3\u51b3<\/h1>\n<h4>\u8bf7\u901a\u8fc7\u547d\u4ee4\u786e\u8ba4TIME_WAIT\u7684\u6570\u76ee<\/h4>\n<p>$ netstat -anp | grep \u65f6\u95f4\u7b49\u5f85<\/p>\n<pre class=\"post-pre\"><code>__(snip)__\r\ntcp        0      0 192.168.1.1:80  192.97.67.192:56305         TIME_WAIT   -\r\ntcp        0      0 192.168.1.1:80  192.63.64.145:65274         TIME_WAIT   -\r\ntcp        0      0 192.168.1.1:80  192.39.2.205:3325           TIME_WAIT   -\r\ntcp        0      0 192.168.1.1:80  192.102.102.9:54300         TIME_WAIT   -\r\ntcp        0      0 192.168.1.1:80  192.71.125.102:61769        TIME_WAIT   -\r\n__(snip)__\r\n<\/code><\/pre>\n<h4>\u66f4\u6539\u5185\u6838\u53c2\u6570\u8bbe\u7f6e<\/h4>\n<p>\u6839\u636e IBM \u7684 Red Hat Enterprise Linux \u8c03\u6574\u6307\u5357\uff0c\u901a\u8fc7\u5bf9 tcp_tw_reuse\u3001tcp_tw_recycle \u548c tcp_fin_timeout \u53c2\u6570\u8fdb\u884c\u4ee5\u4e0b\u9644\u52a0\u8bbe\u7f6e\uff0c\u53ef\u4ee5\u964d\u4f4e\u8fd9\u4e9b\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>net.ipv4.tcp_tw_recycle = 1\r\nnet.ipv4.tcp_tw_reuse = 1\r\nnet.ipv4.tcp_fin_timeout = 30\r\n<\/code><\/pre>\n<h4>\u8bbe\u7f6e\u5185\u6838\u53c2\u6570\u7684\u5e94\u7528<\/h4>\n<p>\u5c06\u4ee5\u4e0b\u547d\u4ee4\u8fdb\u884c\u4e2d\u6587\u8868\u8ff0\uff1a<br \/>\n# sysctl -p<\/p>\n<p>\u8fd0\u884c sysctl \u547d\u4ee4\u5e76\u5e94\u7528\u914d\u7f6e\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"graph3.png\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d91e4913a08637a6e0e2b\/13-0.png\" alt=\"graph3.png\" \/><\/div>\n<p>\u55ef\uff0c\u786e\u5b9e\u53ef\u770b\u5230TIME_WAIT\u6570\u91cf\u5728\u51cf\u5c11\u3002<\/p>\n<h1>TIME_WAIT\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/h1>\n<p>\u8ba9\u6211\u4eec\u6765\u67e5\u770bRFC793\u4e2d\u539f\u59cbTCP\u6807\u51c6\u548cTCP Reno\u7684\u62e5\u585e\u63a7\u5236\u673a\u5236\u7684\u7f51\u7edc\u72b6\u6001\u8f6c\u79fb\u56fe\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"efsm.png\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d91e4913a08637a6e0e2b\/17-0.png\" alt=\"efsm.png\" \/><\/div>\n<p>\u55ef\uff0c\u770b\u8d77\u6765\u8fd9\u4e2a\u901a\u4fe1\u72b6\u6001\u4eceFIN-WAIT-1\/FIN-WAIT-2\/CLOSING\u8f6c\u53d8\u8fc7\u6765\uff0c\u4f3c\u4e4e\u6ca1\u6709\u5fc5\u8981\u505c\u7559\u3002<\/p>\n<h1>\u6362\u4e2a\u89d2\u5ea6\u770b<\/h1>\n<p>\u7ef4\u57fa\u767e\u79d1\uff1a\u4ece\u4f20\u8f93\u63a7\u5236\u534f\u8bae\u7684ESTABLISHED\u72b6\u6001\u5230CLOSED\u72b6\u6001\u7684\u72b6\u6001\u8f6c\u79fb\u8fdb\u884c\u987a\u5e8f\u89c2\u5bdf\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"tcp.jpg\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d91e4913a08637a6e0e2b\/21-0.jpeg\" alt=\"tcp.jpg\" \/><\/div>\n<p>\u6bd4\u5982\uff0c\u5982\u679cInitiator\u662fWeb\u670d\u52a1\u5668\uff0c\u800cReceiver\u662f\u7535\u8111\u6216\u624b\u673a\uff0c\u90a3\u4e48\u5f53Web\u670d\u52a1\u5668\u5904\u4e8eTIME_WAIT\u72b6\u6001\u65f6\uff0c\u5b83\u662f\u4e0d\u662f\u5728\u7b49\u5f85\u624b\u673a\u5173\u95ed\u5462\u3002<\/p>\n<p>\u5982\u679c\u662f\u8fd9\u6837\u7684\u8bdd\uff0c\u5982\u679cReceiver\u7684CLOSED\u64cd\u4f5c\u5c3d\u65e9\u5b8c\u6210\uff0c\u90a3\u4e48Initiator\u65b9\u9762\u7684\u7b49\u5f85\u65f6\u95f4\uff08tw_fin_timeout\u503c\uff09\u662f\u4e0d\u662f\u53ef\u4ee5\u5c3d\u91cf\u7f29\u77ed\uff1f<\/p>\n<h1>\u518d\u6b21\u67e5\u770b\u5185\u6838\u53c2\u6570\u7684\u5185\u5bb9<\/h1>\n<p>TCP\u8fde\u63a5\u7ec8\u6b62\u8d85\u65f6\u65f6\u95f4<\/p>\n<blockquote><p>\u5982\u679c\u7531\u6211\u4eec\u8fd9\u4e00\u65b9\u5173\u95ed\uff0c\u5219\u5c06\u5957\u63a5\u5b57\u4fdd\u6301\u4e3aFIN-WAIT-2\u72b6\u6001\u7684\u65f6\u95f4\u3002\u5bf9\u7b49\u65b9\u53ef\u80fd\u4f1a\u65ad\u5f00\u8fde\u63a5\uff0c\u5e76\u4e14\u4e0d\u4f1a\u5173\u95ed\u81ea\u5df1\u7684\u4e00\u65b9\uff0c\u751a\u81f3\u53ef\u80fd\u610f\u5916\u6b7b\u673a\u3002\u9ed8\u8ba4\u503c\u4e3a60\u79d2\u30022.2\u7248\u672c\u4e2d\u4f7f\u7528\u7684\u901a\u5e38\u503c\u4e3a180\u79d2\uff0c\u60a8\u53ef\u4ee5\u6062\u590d\u5b83\uff0c\u4f46\u8981\u8bb0\u4f4f\uff0c\u5982\u679c\u60a8\u7684\u673a\u5668\u662f\u8d1f\u8f7d\u8f83\u8f7b\u7684WEB\u670d\u52a1\u5668\uff0c\u60a8\u6709\u53ef\u80fd\u56e0\u4e3a\u5927\u91cf\u7684\u5df2\u65ad\u5f00\u8fde\u63a5\u7684\u5957\u63a5\u5b57\u800c\u5bfc\u81f4\u5185\u5b58\u6ea2\u51fa\uff0cFIN-WAIT-2\u5957\u63a5\u5b57\u6bd4FIN-WAIT-1\u5957\u63a5\u5b57\u5371\u9669\u6027\u8f83\u4f4e\uff0c\u56e0\u4e3a\u5b83\u4eec\u6700\u591a\u5360\u75281.5K\u7684\u5185\u5b58\uff0c\u4f46\u662f\u5b83\u4eec\u5f80\u5f80\u5b58\u5728\u65f6\u95f4\u66f4\u957f\u3002<\/p><\/blockquote>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30bd\u30b1\u30c3\u30c8\u3092\u3053\u3061\u3089(\u4e0a\u8a18Receiver)\u5074\u304b\u3089\u30af\u30ed\u30fc\u30ba\u3057\u305f\u3068\u304d\u306b\u3001FIN-WAIT-2 \u72b6\u614b\u306b\u4fdd\u3064\u6642\u9593\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u901a\u4fe1\u5148\u304c\u5207\u308c\u3066\u3057\u307e\u3063\u305f\u308a\u3001\u5148\u65b9\u3067\u306e\u30af\u30ed\u30fc\u30ba\u3092\u305a\u3063\u3068\u884c\u308f\u306a\u304b\u3063\u305f\u308a\u3001 \u3042\u308b\u3044\u306f\u4e88\u671f\u3057\u306a\u3044\u5f62\u3067\u7d42\u4e86\u3057\u3066\u3057\u307e\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u5024\u306f 60 \u79d2\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">2.2 \u3067\u7528\u3044\u3089\u308c\u3066\u3044\u305f\u901a\u5e38\u306e\u5024\u306f 180 \u79d2\u3067\u3001 \u3053\u306e\u8a2d\u5b9a\u306b\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u304c\u3001\u30de\u30b7\u30f3\u304c (\u5fc5\u305a\u3057\u3082\u8ca0\u8377\u304c\u9ad8\u304f\u306a\u304f\u3066\u3082) WEB \u30b5\u30fc\u30d0\u3060\u3063\u305f\u308a\u3059\u308b\u3068\u3001 \u81a8\u5927\u306a FIN-WAIT-2 \u30bd\u30b1\u30c3\u30c8\u306e\u305b\u3044\u3067\u30e1\u30e2\u30ea\u304c\u6ea2\u308c\u308b\u5371\u967a\u3082\u3042\u308a\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">FIN-WAIT-2 \u30bd\u30b1\u30c3\u30c8\u306f 1.5K \u306e\u30e1\u30e2\u30ea\u3057\u304b\u6d88\u8cbb\u3057\u306a\u3044\u306e\u3067 FIN-WAIT-1 \u307b\u3069\u5371\u967a\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u9577\u304f\u5b58\u5728\u3059\u308b\u50be\u5411\u304c\u3042\u308a\u307e\u3059\u3002<\/ul>\n<p>TCP_TW_REUSE \u662f TCP \u534f\u8bae\u7684\u4e00\u4e2a\u9009\u9879\u3002<\/p>\n<blockquote><p>\u5f53\u4ece\u534f\u8bae\u7684\u89d2\u5ea6\u6765\u770b\u662f\u5b89\u5168\u7684\u65f6\u5019\uff0c\u8fd9\u5141\u8bb8\u5728TIME_WAIT\u72b6\u6001\u4e0b\u91cd\u7528\u5957\u63a5\u5b57\u4ee5\u7528\u4e8e\u65b0\u8fde\u63a5\u3002\u9ed8\u8ba4\u503c\u4e3a0\uff08\u7981\u7528\uff09\u3002\u8fd9\u901a\u5e38\u662ftcp_tw_recycle\u7684\u66f4\u5b89\u5168\u7684\u9009\u62e9\u3002<br \/>\n\u6ce8\u610f\uff1atcp_tw_reuse\u8bbe\u7f6e\u5728\u5b58\u5728\u5927\u91cf\u77ed\u8fde\u63a5\u5e76\u5904\u4e8eTIME_WAIT\u72b6\u6001\u7684\u73af\u5883\u4e2d\u7279\u522b\u6709\u7528\uff0c\u6bd4\u5982Web\u670d\u52a1\u5668\u548c\u8d1f\u8f7d\u5747\u8861\u5668\u3002\u91cd\u7528\u5957\u63a5\u5b57\u53ef\u4ee5\u975e\u5e38\u6709\u6548\u5730\u51cf\u5c11\u670d\u52a1\u5668\u8d1f\u8f7d\u3002\u4eceLinux 2.6.7\u5f00\u59cb\uff08\u5e76\u53cd\u5411\u517c\u5bb9\u52302.4.27\uff09\uff0cLinux\u8fd8\u63d0\u4f9b\u4e86\u4f20\u7edf\u7684\u201creno\u201d\u7b97\u6cd5\u4ee5\u5916\u7684\u66ff\u4ee3\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u3002\u8fd9\u4e9b\u7b97\u6cd5\u65e8\u5728\u5feb\u901f\u6062\u590d\u9ad8\u901f\u5e7f\u57df\u7f51\u4e0a\u7684\u6570\u636e\u5305\u4e22\u5931\u3002<\/p><\/blockquote>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u3053\u308c\u306f\u3001\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u89b3\u70b9\u304b\u3089\u5b89\u5168\u306b\u65b0\u3057\u3044\u63a5\u7d9a\u3067TIME_WAIT\u306e\u30bd\u30b1\u30c3\u30c8\u518d\u5229\u7528\u3059\u308b\u3053\u3068\u3092\u8a31\u53ef\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30c7\u30d5\u30a9\u30eb\u30c8\u306f0(\u7121\u52b9)\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u3053\u308c\u306f\u4e00\u822c\u7684\u306btcp_tw_recycle\u3088\u308a\u3082\u5b89\u5168\u306a\u65b9\u6cd5\u3067\u3059\u3002<\/ul>\n<p>\u6ce8\u610f\uff1atcp_tw_reuse\u8bbe\u7f6e\u5728\u50cfWeb\u670d\u52a1\u5668\u6216\u8d1f\u8f7d\u5747\u8861\u5668\u8fd9\u6837\u7684\u73af\u5883\u4e2d\u7279\u522b\u6709\u7528\uff0c\u8fd9\u4e9b\u73af\u5883\u4e2d\u4f1a\u6709\u5927\u91cf\u7684\u77ed\u8fde\u63a5\u5904\u4e8eTIME_WAIT\u72b6\u6001\u3002\u91cd\u590d\u4f7f\u7528\u5957\u63a5\u5b57\u5bf9\u4e8e\u51cf\u8f7b\u670d\u52a1\u5668\u8d1f\u8f7d\u975e\u5e38\u6709\u6548\u3002\u4eceLinux2.6.7\u5f00\u59cb\uff0cLinux\u5b9e\u73b0\u4e86\u66ff\u4ee3\u7684\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\uff0c\u9664\u4e86\u4f20\u7edf\u7684\u201cReno\u201d\u7b97\u6cd5\u3002\u8fd9\u4e9b\u7b97\u6cd5\u65e8\u5728\u5feb\u901f\u6062\u590d\u4ece\u9ad8\u901f\u5e7f\u57df\u7f51\u4e0a\u7684\u6570\u636e\u5305\u4e22\u5931\u3002<\/p>\n<p>TCP_TW_RECYCLE \u53ef\u4ee5\u88ab\u7ffb\u8bd1\u4e3a &#8220;TCP \u8d85\u65f6\u8fde\u63a5&#8221;]<\/p>\n<blockquote><p>\u8fd9\u4f7f\u5f97TIME_WAIT\u5957\u63a5\u5b57\u80fd\u591f\u5feb\u901f\u56de\u6536\u3002\u9ed8\u8ba4\u503c\u4e3a0\uff08\u7981\u7528\uff09\u3002\u5728\u8d1f\u8f7d\u5747\u8861\u5668\u4e0a\u4f7f\u7528\u65f6\u5e94\u8be5\u8c28\u614e\u3002<\/p><\/blockquote>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">TIME-WAIT\u30bd\u30b1\u30c3\u30c8\u3092\u65e9\u304f\u518d\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u5024\u306f0\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u306a\u3069\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u6ce8\u610f\u3057\u3066\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>[\u6ce8]kernel4.1.2\u3067\u524a\u9664\u3055\u308c\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002 tcp: remove tcp_tw_recycle<\/p>\n<h1>TCP_FIN_TIMEOUT\u5e94\u8be5\u8bbe\u7f6e\u4e3a\u591a\u4e45\u5408\u9002\uff1f<\/h1>\n<p>\u6211\u5c1d\u8bd5\u4e86\u4e00\u4e9b\u7f51\u7ad9\uff081,2,3\uff09\uff0c\u867d\u7136\u627e\u5230\u4e86\u5f88\u591a\u5173\u4e8e30\u79d2\u7684\u8bf4\u6cd5\uff0c\u4f46\u8303\u56f4\u4ece1\u523030\u79d2\uff0c\u6ca1\u6709\u4ec0\u4e48\u660e\u663e\u7684\u51b3\u5b9a\u6027\u56e0\u7d20\u3002\u7531\u4e8e\u7f51\u7edc\u901f\u5ea6\u6709\u6240\u63d0\u5347\uff0c60\u79d2\u53ef\u80fd\u592a\u957f\u4e86\uff0c\u4f46\u53ef\u4ee5\u6839\u636e\u5404\u4e2a\u670d\u52a1\u5668\u73af\u5883\u8fdb\u884c\u8c03\u6574\u3002<\/p>\n<h4>\u81ea\u884c\u601d\u8003\u5e76\u786e\u5b9a\u8bbe\u5b9a\u7684\u53c2\u8003\u503c<\/h4>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u306a\u308b\u3079\u304f\u7a4d\u6975\u7684\u306b\u30ea\u30bd\u30fc\u30b9\u3092\u958b\u653e\u3057\u305f\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5916\u90e8\u3068\u901a\u4fe1\u3059\u308b\u3082\u306e\u306f\u901a\u4fe1\u72b6\u614b\u304c\u69d8\u3005\u306a\u306e\u3067\u3042\u308b\u7a0b\u5ea6\u6642\u9593\u3092\u4fdd\u3064<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5185\u90e8\u3067\u901a\u4fe1\u3059\u308b\u3082\u306e\u306fGigabit Ethernet\u306a\u3069\u304c\u5897\u3048\u3066\u3044\u308b\u306e\u3067\u3042\u308b\u7a0b\u5ea6\u77ed\u304f\u3067\u304d\u308b<\/ul>\n<div>\n<div class=\"post-table\">\u30b5\u30fc\u30d0\u7528\u9014tcp_fin_timeout\u53c2\u8003\u5024\u5099\u8003WEB20\u301c30\u79d2<br \/>\nHadoop15\u301c30\u79d2<br \/>\nKVS(cassandra)1\u301c5\u79d2\u653b\u3081\u3059\u304e\uff1f<\/div>\n<\/div>\n<h4>\u8981\u786e\u8ba4TIME_WAIT\u7684\u7b49\u5f85\u65f6\u95f4\u72b6\u6001\uff0c\u8be5\u600e\u4e48\u505a\uff1f<\/h4>\n<p>Netstat\u8fd8\u6709\u4e00\u4e9b\u6709\u7528\u7684\u9009\u9879\u3002\u4f7f\u7528\u8fd9\u4e9b\u9009\u9879\u53ef\u4ee5\u5728\u8fdb\u884c\u8c03\u6574\u7684\u540c\u65f6\u8fdb\u884c\u786e\u8ba4\uff0c\u8fd9\u662f\u4e00\u4e2a\u597d\u4e3b\u610f\u3002<\/p>\n<p>netstat -anpto \u7684\u4e2d\u6587\u8868\u8ff0\uff1a\u5c55\u793a\u7f51\u7edc\u8fde\u63a5\u72b6\u6001\uff0c\u5305\u62ec\u76d1\u542c\u548c\u5df2\u5efa\u7acb\u7684\u8fde\u63a5\uff0c\u5e76\u663e\u793a\u76f8\u5173\u8fdb\u7a0b\u4fe1\u606f\u3002<\/p>\n<pre class=\"post-pre\"><code>__(snip)__\r\ntcp    0   0 192.168.1.1:80  192.2.197.186:58601    TIME_WAIT   -   timewait (52.22\/0\/0)\r\ntcp    0   0 192.168.1.1:80  192.82.117.34:56977    TIME_WAIT   -   timewait (30.70\/0\/0)\r\ntcp    0   0 192.168.1.1:80  192.135.233.60:60358   TIME_WAIT   -   timewait (40.65\/0\/0)\r\ntcp    0   0 192.168.1.1:80  192.4.206.121:64294    TIME_WAIT   -   timewait (29.46\/0\/0)\r\ntcp    0   0 192.168.1.1:80  192.2.197.186:58600    TIME_WAIT   -   timewait (52.22\/0\/0)\r\ntcp    0   0 192.168.1.1:80  192.82.117.34:56464    TIME_WAIT   -   timewait (28.03\/0\/0)\r\ntcp    0   0 192.168.1.1:80  192.169.145.26:60343   TIME_WAIT   -   timewait (13.64\/0\/0)\r\ntcp    0   0 192.168.1.1:80  192.193.81.104:61038   TIME_WAIT   -   timewait (24.37\/0\/0)\r\n__(snip)__\r\n<\/code><\/pre>\n<h1>&#8220;tcp_tw_recycle \u5b58\u5728\u4ec0\u4e48\u95ee\u9898\u5417\uff1f&#8221;<\/h1>\n<p>\u6839\u636e\u5bf9Koko\u548cKoko2\u7684\u9a8c\u8bc1\uff0c\u4f7f\u7528net.ipv4.tcp_timestamps\u548cnet.ipv4.tcp_tw_recycle\u4e24\u8005\u90fd\u4f1a\u4ea7\u751f<\/p>\n<p>Linux\u7684\/net\/ipv4\/tcp_ipv4.c<br \/>\nLinux\u7684\/include\/net\/tcp.h<\/p>\n<p>\u6839\u636e\u4e0a\u8ff0\u7684\u903b\u8f91\uff0c\u4f3c\u4e4e\u5728\u8d1f\u8f7d\u5747\u8861\u5668\u6216NAT\u7684\u540e\u65b9\u53ef\u80fd\u4f1a\u51fa\u73b0\u95ee\u9898\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"tcp_tw_recycle.png\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d91e4913a08637a6e0e2b\/48-0.png\" alt=\"tcp_tw_recycle.png\" \/><\/div>\n<h1>\u603b\u7ed3<\/h1>\n<p>\u5982\u679c\u4e0d\u662f\u5728LB\u4e4b\u4e0b\u7684\u72ec\u7acb\u670d\u52a1\u5668\uff0c\u6211\u8ba4\u4e3a\u4ee5\u4e0b\u7684\u8bbe\u5b9a\u53ef\u80fd\u4f1a\u5f88\u597d\u3002\u53e6\u5916\uff0c\u5982\u679c\u4ec5\u9650\u4e8e\u5165\u7ad9\u901a\u4fe1\uff0c\u4e5f\u8bb8\u53ef\u4ee5\u6210\u529f\u51cf\u5c11TIME_WAIT\u3002*tcp_fin_timeout\u5e94\u6839\u636e\u73af\u5883\u8fdb\u884c\u8c03\u6574\u3002<\/p>\n<pre class=\"post-pre\"><code>net.ipv4.tcp_tw_recycle = 1\r\nnet.ipv4.tcp_tw_reuse = 1\r\nnet.ipv4.tcp_fin_timeout = 30\r\n<\/code><\/pre>\n<p>\u4e5f\u8bb8\u8003\u8651\u5c06\u4f4d\u4e8eLB\u4e0b\u65b9\u7684WEB\u670d\u52a1\u5668\u7b49\u7981\u7528tcp_tw_recycle\u7684\u8bbe\u7f6e\u4f1a\u66f4\u597d\u3002<\/p>\n<pre class=\"post-pre\"><code>net.ipv4.tcp_tw_reuse = 1\r\nnet.ipv4.tcp_fin_timeout = 30\r\n<\/code><\/pre>\n<p>\u8fd9\u6b21\u53ea\u5173\u6ce8\u4e86\u4ece\u4ee5\u524d\u5c31\u7ecf\u5e38\u51fa\u73b0\u7684\u4e09\u4e2a\u53c2\u6570\uff0c\u4f46\u7531\u4e8e\u6709\u5f88\u591a\u53c2\u6570\uff0c\u8fd8\u5b58\u5728\u5f88\u5927\u7684\u6539\u8fdb\u7a7a\u95f4\uff0c\u53ef\u4ee5\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<p>\u9ed8\u8ba4\u503c\u4f3c\u4e4e\u662f\u4e00\u76f4\u6ca1\u6709\u53d8\u5316\u7684\u5386\u53f2\u9009\u62e9\uff0c\u56e0\u6b64\u6211\u4eec\u9700\u8981\u5145\u5206\u7406\u89e3\u5b83\u7684\u91cd\u8981\u6027\u5e76\u91cd\u65b0\u8ba4\u8bc6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b66\u4e1a\u4efb\u52a1 \u5982\u679c\u7a81\u7136\u8bf4\u4f1a\u6709\u9ad8\u6d41\u91cf\u7684\u4fc3\u9500\u6d3b\u52a8\u4e4b\u7c7b\u7684\u5230\u6765\uff0c\u867d\u7136\u4f1a\u9047\u5230\u4e00\u4e9b\u56f0\u96be\uff0c\u4f46\u73b0\u5728\u662f\u4e91\u65f6\u4ee3\uff0c\u53ea\u8981\u63d0\u5347\u4e00\u4e0b\u786c\u4ef6\u914d\u7f6e\u5e94 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50484","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5168\u90e8\u90fd\u662fTIME_WAIT\u7684\u539f\u56e0\uff01 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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