{"id":59264,"date":"2026-01-13T14:54:07","date_gmt":"2026-01-13T06:54:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/59264.html"},"modified":"2026-01-13T14:54:07","modified_gmt":"2026-01-13T06:54:07","slug":"%e4%bb%8etime_wait%e7%88%86%e7%82%b8%e5%88%b0%e7%ab%af%e5%8f%a3%e8%80%97%e5%b0%bd%ef%bc%9alinux%e7%9f%ad%e8%bf%9e%e6%8e%a5%e6%9c%8d%e5%8a%a1%e6%8e%92%e6%9f%a5%e4%b8%8e%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/59264.html","title":{"rendered":"\u4eceTIME_WAIT\u7206\u70b8\u5230\u7aef\u53e3\u8017\u5c3d\uff1aLinux\u77ed\u8fde\u63a5\u670d\u52a1\u6392\u67e5\u4e0e\u4f18\u5316"},"content":{"rendered":"<h3>\u524d\u8a00<\/h3>\n<p>\u7ebf\u4e0a\u6700\u201c\u7384\u5b66\u201d\u7684\u4e00\u7c7b\u6545\u969c&#xff0c;\u662f\u670d\u52a1\u672c\u8eab\u6ca1\u5d29&#xff0c;\u4f46\u5c31\u662f\u8fde\u4e0d\u4e0a&#xff1a;\u8bf7\u6c42\u5927\u91cf\u8d85\u65f6\u3001\u5076\u53d1 connection refused\u3001\u7f51\u5173\/\u5e94\u7528\u62a5 cannot assign requested address&#xff0c;\u91cd\u542f\u4e00\u4f1a\u513f\u53c8\u597d\u3002<\/p>\n<p>\u5f88\u591a\u65f6\u5019&#xff0c;\u8fd9\u4e0d\u662fCPU\u4e5f\u4e0d\u662f\u5185\u5b58&#xff0c;\u800c\u662f\u8fde\u63a5\u8d44\u6e90\u88ab\u8017\u5c3d\u4e86\u2014\u2014\u5178\u578b\u8868\u73b0\u662f TIME_WAIT \u7206\u70b8\u3001\u672c\u673a\u4e34\u65f6\u7aef\u53e3&#xff08;ephemeral ports&#xff09;\u8017\u5c3d\u3001\u6216\u8005 conntrack \u8868\u6253\u6ee1\u3002<\/p>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u7ed9\u4f60\u4e00\u5957\u53ef\u843d\u5730\u7684\u65b9\u6cd5&#xff1a;\u5148\u7528\u6700\u5c11\u7684\u547d\u4ee4\u628a\u95ee\u9898\u5b9a\u6027&#xff0c;\u518d\u628a\u6839\u56e0\u5206\u5230\u201c\u5e94\u7528\/\u7cfb\u7edf\/\u7f51\u7edc\u8bbe\u5907\u201d\u4e09\u5c42&#xff0c;\u6700\u540e\u7ed9\u51fa\u4e00\u7ec4\u7a33\u59a5\u7684\u4f18\u5316\u7ec4\u5408&#xff08;\u542b\u98ce\u9669\u70b9&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u5148\u628a\u73b0\u8c61\u8bf4\u6e05\u695a&#xff1a;\u5230\u5e95\u201c\u8017\u5c3d\u201d\u7684\u662f\u4ec0\u4e48&#xff1f;<\/h3>\n<p>\u5e38\u89c1\u62a5\u9519\u5927\u81f4\u5bf9\u5e94\u4e09\u7c7b\u8d44\u6e90&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u7aef\u53e3\u8017\u5c3d&#xff08;\u672c\u673a\u4e34\u65f6\u7aef\u53e3\u7528\u5b8c&#xff09;<\/p>\n<ul>\n<li>\u5ba2\u6237\u7aef\u4fa7\u5e38\u89c1&#xff1a;bind: cannot assign requested address<\/li>\n<li>\u76f4\u89c9&#xff1a;\u4f60\u4ee5\u4e3a\u662f\u201c\u8fde\u4e0d\u4e0a\u5bf9\u65b9\u201d&#xff0c;\u5b9e\u9645\u4e0a\u662f\u201c\u6211\u81ea\u5df1\u6ca1\u7aef\u53e3\u4e86\u201d<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8fde\u63a5\/\u6587\u4ef6\u63cf\u8ff0\u7b26\u8017\u5c3d&#xff08;FD\u4e0d\u591f&#xff09;<\/p>\n<ul>\n<li>\u5e38\u89c1&#xff1a;too many open files<\/li>\n<li>\u76f4\u89c9&#xff1a;\u8fdb\u7a0b\u80fd\u8dd1&#xff0c;\u4f46\u65b0\u8fde\u63a5\u5efa\u4e0d\u8d77\u6765<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u8fde\u63a5\u8ddf\u8e2a&#xff08;conntrack&#xff09;\u8017\u5c3d&#xff08;\u5e38\u89c1\u4e8eNAT\/\u9632\u706b\u5899&#xff09;<\/p>\n<ul>\n<li>\u5e38\u89c1&#xff1a;\u8f6c\u53d1\/\u7f51\u5173\u4fa7\u4e22\u5305\u3001\u8fde\u63a5\u5efa\u7acb\u6162\u3001\u968f\u673a\u8d85\u65f6<\/li>\n<li>\u76f4\u89c9&#xff1a;\u4e1a\u52a1\u673a\u5668\u770b\u8d77\u6765\u6b63\u5e38&#xff0c;\u4f46\u201c\u8fc7\u7f51\u5173\u5c31\u574f\u201d<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u8fd9\u4e09\u7c7b\u95ee\u9898\u4f1a\u4e92\u76f8\u53e0\u52a0&#xff0c;\u6240\u4ee5\u7b2c\u4e00\u6b65\u5fc5\u987b\u5b9a\u6027&#xff1a;\u73b0\u5728\u5361\u5728\u8c01\u8eab\u4e0a\u3002<\/p>\n<hr \/>\n<h3>\u4e8c\u3001\u4e09\u6761\u547d\u4ee4\u5feb\u901f\u5b9a\u6027&#xff08;5\u5206\u949f\u5185\u51fa\u7ed3\u8bba&#xff09;<\/h3>\n<h4>2.1 \u5148\u770b\u8fde\u63a5\u72b6\u6001\u5206\u5e03<\/h4>\n<p>ss -s<\/p>\n<p>\u91cd\u70b9\u770b&#xff1a;<\/p>\n<ul>\n<li>TCP: \u603b\u91cf<\/li>\n<li>estab&#xff08;ESTABLISHED&#xff09;\u662f\u5426\u5f02\u5e38\u9ad8<\/li>\n<li>timewait \u662f\u5426\u5f02\u5e38\u9ad8<\/li>\n<li>orphaned \/ tw&#xff08;\u4e0d\u540c\u7cfb\u7edf\u663e\u793a\u7565\u6709\u5dee\u5f02&#xff09;<\/li>\n<\/ul>\n<p>\u518d\u7ec6\u4e00\u70b9\u770b&#xff1a;<\/p>\n<p>ss -tan state time-wait <span class=\"token operator\">|<\/span> <span class=\"token function\">wc<\/span> -l<br \/>\nss -tan state established <span class=\"token operator\">|<\/span> <span class=\"token function\">wc<\/span> -l<\/p>\n<p>\u5982\u679c TIME-WAIT \u8fdc\u5927\u4e8e ESTABLISHED&#xff0c;\u901a\u5e38\u662f\u77ed\u8fde\u63a5\u8fc7\u591a&#xff08;\u6216\u8fde\u63a5\u590d\u7528\u5931\u8d25&#xff09;\u5f15\u8d77\u3002<\/p>\n<h4>2.2 \u786e\u8ba4\u662f\u5426\u662f\u201c\u7aef\u53e3\u8017\u5c3d\u201d<\/h4>\n<p>\u5148\u770b\u672c\u673a\u4e34\u65f6\u7aef\u53e3\u8303\u56f4&#xff1a;<\/p>\n<p>sysctl net.ipv4.ip_local_port_range<\/p>\n<p>\u8f93\u51fa\u7c7b\u4f3c&#xff1a;<\/p>\n<p>net.ipv4.ip_local_port_range &#061; 32768 60999<\/p>\n<p>\u8fd9\u610f\u5473\u7740\u53ef\u7528\u4e34\u65f6\u7aef\u53e3\u5927\u7ea6 28k \u4e2a\u3002\u7136\u540e\u770b TIME_WAIT \u6570\u91cf\u662f\u4e0d\u662f\u63a5\u8fd1\u8fd9\u4e2a\u6570\u91cf\u7ea7&#xff08;\u751a\u81f3\u66f4\u9ad8&#xff09;\u3002<\/p>\n<p>\u5feb\u901f\u4f30\u7b97&#xff1a;\u5982\u679c\u4f60\u6709 30k \u5de6\u53f3 TIME_WAIT&#xff0c;\u540c\u65f6\u5e94\u7528\u8fd8\u5728\u731b\u70c8\u53d1\u8d77\u65b0\u8fde\u63a5&#xff0c;\u7aef\u53e3\u8017\u5c3d\u5c31\u5f88\u5bb9\u6613\u51fa\u73b0\u3002<\/p>\n<p>\u8fdb\u4e00\u6b65\u786e\u8ba4&#xff1a;\u6293\u4e00\u4e2a\u5178\u578b\u62a5\u9519\u8fdb\u7a0b&#xff0c;\u770b\u5b83\u662f\u5426\u9891\u7e41\u5bf9\u5916\u5efa\u7acb\u8fde\u63a5&#xff1a;<\/p>\n<p><span class=\"token assign-left variable\">pid<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&lt;<\/span>\u4f60\u7684\u8fdb\u7a0bPID<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token function\">lsof<\/span> -p <span class=\"token string\">&#034;<span class=\"token variable\">$pid<\/span>&#034;<\/span> -nP <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> TCP <span class=\"token operator\">|<\/span> <span class=\"token function\">head<\/span><\/p>\n<p>\u5982\u679c\u5927\u91cf\u662f -&gt; \u76ee\u6807IP:\u76ee\u6807\u7aef\u53e3 \u7684 outbound \u8fde\u63a5&#xff0c;\u800c\u4e14\u7aef\u53e3\u6301\u7eed\u53d8\u5316&#xff0c;\u5c31\u662f\u5178\u578b\u7684\u201c\u5ba2\u6237\u7aef\u77ed\u8fde\u63a5\u98ce\u66b4\u201d\u3002<\/p>\n<h4>2.3 \u6392\u9664\/\u786e\u8ba4 conntrack \u6253\u6ee1&#xff08;NAT\/\u7f51\u5173\u7279\u522b\u5173\u952e&#xff09;<\/h4>\n<p><span class=\"token function\">cat<\/span> \/proc\/sys\/net\/netfilter\/nf_conntrack_count<br \/>\n<span class=\"token function\">cat<\/span> \/proc\/sys\/net\/netfilter\/nf_conntrack_max<\/p>\n<p>\u5982\u679c count \u63a5\u8fd1 max&#xff0c;\u57fa\u672c\u53ef\u4ee5\u5224\u5b9a&#xff1a;conntrack \u5728\u6389\u94fe\u5b50\u3002\u8fd9\u7c7b\u95ee\u9898\u5e38\u89c1\u5728&#xff1a;<\/p>\n<ul>\n<li>\u51fa\u53e3 NAT \u7f51\u5173<\/li>\n<li>K8s \u8282\u70b9&#xff08;iptables \u6a21\u5f0f &#043; \u5927\u91cf\u51fa\u5411\u8fde\u63a5&#xff09;<\/li>\n<li>\u9632\u706b\u5899\u8bbe\u5907&#xff08;Linux \u505a\u7f51\u5173&#xff09;<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e09\u3001\u628a\u6839\u56e0\u5206\u5c42&#xff1a;\u5e94\u7528\u5c42 \/ \u7cfb\u7edf\u5c42 \/ \u7f51\u7edc\u5c42<\/h3>\n<h4>3.1 \u5e94\u7528\u5c42&#xff1a;\u8fde\u63a5\u6ca1\u6709\u590d\u7528&#xff08;\u6700\u5e38\u89c1&#xff09;<\/h4>\n<p>\u73b0\u8c61&#xff1a;TIME_WAIT \u591a\u3001\u7aef\u53e3\u6d88\u8017\u5feb&#xff0c;\u4f46\u670d\u52a1CPU\/\u5185\u5b58\u5e76\u4e0d\u9ad8\u3002<\/p>\n<p>\u6839\u56e0\u901a\u5e38\u662f&#xff1a;<\/p>\n<ul>\n<li>HTTP \u5ba2\u6237\u7aef\u6ca1\u542f\u7528 keep-alive&#xff08;\u6216\u9891\u7e41\u521b\u5efa client&#xff09;<\/li>\n<li>\u8fde\u63a5\u6c60\u592a\u5c0f&#xff0c;\u6c60\u6ee1\u540e\u9000\u5316\u6210\u77ed\u8fde\u63a5<\/li>\n<li>\u8bf7\u6c42\u8d85\u65f6\u8bbe\u7f6e\u4e0d\u5f53\u5bfc\u81f4\u8fde\u63a5\u88ab\u52a8\u5173\u95ed\/\u9891\u7e41\u91cd\u5efa<\/li>\n<\/ul>\n<h5>3.1.1 Go&#xff1a;\u6700\u5bb9\u6613\u8e29\u7684\u51e0\u4e2a\u70b9<\/h5>\n<p>Go \u7684 http.Client \u662f\u53ef\u590d\u7528\u5bf9\u8c61\u3002\u5e38\u89c1\u9519\u8bef\u662f\u6bcf\u6b21\u8bf7\u6c42\u90fd &amp;http.Client{} \u6216 http.NewRequest \u540e\u4e0d\u6b63\u786e\u5904\u7406 body\u3002<\/p>\n<p>\u5173\u952e\u8981\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u590d\u7528\u540c\u4e00\u4e2a http.Client<\/li>\n<li>\u8bfb\u5b8c\u5e76\u5173\u95ed resp.Body&#xff08;\u5426\u5219\u8fde\u63a5\u65e0\u6cd5\u590d\u7528&#xff09;<\/li>\n<li>\u8bbe\u7f6e\u5408\u7406\u7684\u8fde\u63a5\u6c60\u53c2\u6570&#xff08;Transport&#xff09;<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff08;\u53ef\u4f5c\u4e3a\u751f\u4ea7\u9ed8\u8ba4\u6a21\u677f&#xff09;&#xff1a;<\/p>\n<p>tr <span class=\"token operator\">:&#061;<\/span> <span class=\"token operator\">&amp;<\/span>http<span class=\"token punctuation\">.<\/span>Transport<span class=\"token punctuation\">{<\/span><br \/>\n    Proxy<span class=\"token punctuation\">:<\/span> http<span class=\"token punctuation\">.<\/span>ProxyFromEnvironment<span class=\"token punctuation\">,<\/span><br \/>\n    MaxIdleConns<span class=\"token punctuation\">:<\/span>        <span class=\"token number\">1000<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    MaxIdleConnsPerHost<span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">,<\/span><br \/>\n    IdleConnTimeout<span class=\"token punctuation\">:<\/span>     <span class=\"token number\">90<\/span> <span class=\"token operator\">*<\/span> time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">,<\/span><br \/>\n    TLSHandshakeTimeout<span class=\"token punctuation\">:<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">*<\/span> time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">,<\/span><br \/>\n    ExpectContinueTimeout<span class=\"token punctuation\">:<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">*<\/span> time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>client <span class=\"token operator\">:&#061;<\/span> <span class=\"token operator\">&amp;<\/span>http<span class=\"token punctuation\">.<\/span>Client<span class=\"token punctuation\">{<\/span><br \/>\n    Transport<span class=\"token punctuation\">:<\/span> tr<span class=\"token punctuation\">,<\/span><br \/>\n    Timeout<span class=\"token punctuation\">:<\/span>   <span class=\"token number\">5<\/span> <span class=\"token operator\">*<\/span> time<span class=\"token punctuation\">.<\/span>Second<span class=\"token punctuation\">,<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>resp<span class=\"token punctuation\">,<\/span> err <span class=\"token operator\">:&#061;<\/span> client<span class=\"token punctuation\">.<\/span><span class=\"token function\">Get<\/span><span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">if<\/span> err <span class=\"token operator\">!&#061;<\/span> <span class=\"token boolean\">nil<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* &#8230; *\/<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">defer<\/span> resp<span class=\"token punctuation\">.<\/span>Body<span class=\"token punctuation\">.<\/span><span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\nio<span class=\"token punctuation\">.<\/span><span class=\"token function\">Copy<\/span><span class=\"token punctuation\">(<\/span>io<span class=\"token punctuation\">.<\/span>Discard<span class=\"token punctuation\">,<\/span> resp<span class=\"token punctuation\">.<\/span>Body<span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8bfb\u5b8c&#xff0c;\u4fdd\u8bc1\u8fde\u63a5\u53ef\u590d\u7528<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5982\u679c\u4f60\u53ea Close() \u4e0d\u8bfb\u5b8c body&#xff0c;\u5f88\u591a\u60c5\u51b5\u4e0b\u8fde\u63a5\u8fd8\u662f\u4f1a\u88ab\u4e22\u5f03&#xff0c;\u590d\u7528\u6548\u679c\u5f88\u5dee\u3002<\/p>\n<h5>3.1.2 Java&#xff1a;\u8fde\u63a5\u6c60\u4e0e\u590d\u7528\u8981\u201c\u663e\u5f0f\u6b63\u786e\u201d<\/h5>\n<p>\u4ee5 Apache HttpClient \/ OkHttp \u4e3a\u4f8b&#xff0c;\u6838\u5fc3\u662f&#xff1a;<\/p>\n<ul>\n<li>\u8fde\u63a5\u6c60\u8981\u5355\u4f8b<\/li>\n<li>\u8d85\u65f6\u8bbe\u7f6e\u8981\u5408\u7406&#xff08;connect\/read\/write&#xff09;<\/li>\n<li>\u7ebf\u7a0b\u6570\/\u5e76\u53d1\u91cf\u8981\u5339\u914d\u6c60\u5927\u5c0f<\/li>\n<\/ul>\n<p>\u5982\u679c\u4f60\u7528\u7684\u662f\u201c\u6bcf\u6b21 new \u4e00\u4e2a\u5ba2\u6237\u7aef\u201d&#xff0c;TIME_WAIT \u7206\u70b8\u57fa\u672c\u662f\u5fc5\u7136\u7684\u3002<\/p>\n<h4>3.2 \u7cfb\u7edf\u5c42&#xff1a;\u7aef\u53e3\u8303\u56f4\u592a\u5c0f \/ TIME_WAIT \u56de\u6536\u7b56\u7565\u4e0d\u5f53<\/h4>\n<h5>3.2.1 \u6269\u5927\u4e34\u65f6\u7aef\u53e3\u8303\u56f4<\/h5>\n<p>\u9ed8\u8ba4\u8303\u56f4\u5728\u5f88\u591a\u9ad8\u5e76\u53d1\u51fa\u5411\u573a\u666f\u4e0d\u591f\u7528\u3002\u53ef\u4ee5\u6269\u5927\u5230&#xff1a;<\/p>\n<p>sysctl -w net.ipv4.ip_local_port_range<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;10000 65535&#034;<\/span><\/p>\n<p>\u6301\u4e45\u5316\u5199\u5165 \/etc\/sysctl.conf \u6216 \/etc\/sysctl.d\/*.conf\u3002<\/p>\n<h5>3.2.2 TIME_WAIT \u7684\u56de\u6536\u4e0e\u590d\u7528&#xff08;\u8c28\u614e&#xff09;<\/h5>\n<p>\u4f60\u7ecf\u5e38\u4f1a\u770b\u5230\u5efa\u8bae\u5f00&#xff1a;<\/p>\n<p>sysctl -w net.ipv4.tcp_tw_reuse<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><\/p>\n<p>\u5b83\u7684\u542b\u4e49\u662f&#xff1a;\u5728\u4e00\u5b9a\u6761\u4ef6\u4e0b\u5141\u8bb8\u590d\u7528\u5904\u4e8e TIME_WAIT \u7684\u8fde\u63a5&#xff08;\u66f4\u51c6\u786e\u8bf4\u590d\u7528\u672c\u5730\u7aef\u53e3&#xff09;\u3002\u5bf9\u201c\u5ba2\u6237\u7aef\u5927\u91cf\u51fa\u5411\u77ed\u8fde\u63a5\u201d\u6709\u5e2e\u52a9\u3002<\/p>\n<p>\u6ce8\u610f\u4e8b\u9879&#xff1a;<\/p>\n<ul>\n<li>tcp_tw_recycle \u5df2\u7ecf\u88ab\u79fb\u9664&#xff08;\u4e0d\u8981\u518d\u627e\u5b83&#xff0c;\u4e5f\u4e0d\u8981\u518d\u6284\u8fc7\u65f6\u6587\u7ae0&#xff09;<\/li>\n<li>tcp_tw_reuse \u4e3b\u8981\u5f71\u54cd\u201c\u4e3b\u52a8\u53d1\u8d77\u8fde\u63a5\u7684\u4e00\u7aef\u201d&#xff0c;\u5bf9\u7eaf\u670d\u52a1\u7aef\u76d1\u542c\u7aef\u53e3\u5e2e\u52a9\u6709\u9650<\/li>\n<li>\u5982\u679c\u4f60\u7684\u6d41\u91cf\u7ecf\u8fc7 NAT\u3001\u6216\u5bf9\u7aef\u5bf9\u65f6\u95f4\u6233\u654f\u611f&#xff0c;\u6781\u7aef\u60c5\u51b5\u4e0b\u53ef\u80fd\u5f15\u53d1\u8fde\u63a5\u5f02\u5e38&#xff08;\u867d\u4e0d\u5e38\u89c1&#xff0c;\u4f46\u8981\u7070\u5ea6\u9a8c\u8bc1&#xff09;<\/li>\n<\/ul>\n<h5>3.2.3 FIN\/TIME_WAIT \u76f8\u5173\u53c2\u6570&#xff08;\u522b\u4e71\u8c03&#xff09;<\/h5>\n<p>\u6709\u4eba\u559c\u6b22\u8c03&#xff1a;<\/p>\n<p>sysctl -w net.ipv4.tcp_fin_timeout<span class=\"token operator\">&#061;<\/span><span class=\"token number\">15<\/span><\/p>\n<p>\u8fd9\u5bf9\u67d0\u4e9b\u573a\u666f\u80fd\u51cf\u5c11\u8d44\u6e90\u5360\u7528&#xff0c;\u4f46\u4e0d\u662f\u4e07\u80fd\u836f&#xff0c;\u5e76\u53ef\u80fd\u5f71\u54cd\u957f\u8fde\u63a5\u7684\u5173\u95ed\u884c\u4e3a\u3002\u5efa\u8bae\u5148\u628a\u201c\u8fde\u63a5\u590d\u7528\u201d\u505a\u5bf9&#xff0c;\u518d\u8c28\u614e\u8c03\u7cfb\u7edf\u53c2\u6570\u3002<\/p>\n<h4>3.3 \u7f51\u7edc\u5c42&#xff1a;NAT\/\u8d1f\u8f7d\u5747\u8861\u5bfc\u81f4\u7aef\u53e3\u4e0e\u8ddf\u8e2a\u8868\u538b\u529b<\/h4>\n<h5>3.3.1 \u5178\u578b\u573a\u666f&#xff1a;\u51fa\u53e3 NAT \u7aef\u53e3\u8017\u5c3d<\/h5>\n<p>\u5f53\u5f88\u591a\u5185\u7f51\u673a\u5668\u901a\u8fc7\u4e00\u4e2a\u51fa\u53e3IP\u8bbf\u95ee\u516c\u7f51\u65f6&#xff0c;\u51fa\u53e3\u8bbe\u5907\u9700\u8981\u4e3a\u6bcf\u6761\u8fde\u63a5\u5206\u914d SNAT \u7aef\u53e3\u3002SNAT \u7aef\u53e3\u540c\u6837\u662f\u6709\u9650\u7684\u3002<\/p>\n<p>\u8868\u73b0&#xff1a;<\/p>\n<ul>\n<li>\u5185\u7f51\u670d\u52a1\u8bbf\u95ee\u516c\u7f51\u4e0d\u7a33\u5b9a\u3001\u968f\u673a\u8d85\u65f6<\/li>\n<li>\u51fa\u53e3\u8bbe\u5907 nf_conntrack \u63a5\u8fd1\u4e0a\u9650<\/li>\n<\/ul>\n<p>\u89e3\u51b3\u601d\u8def&#xff1a;<\/p>\n<ul>\n<li>\u589e\u52a0\u51fa\u53e3IP&#xff08;SNAT \u591aIP&#xff09;\u5206\u644a\u7aef\u53e3<\/li>\n<li>\u589e\u5927 conntrack \u8868&#xff0c;\u5e76\u4f18\u5316\u8d85\u65f6<\/li>\n<li>\u964d\u4f4e\u77ed\u8fde\u63a5&#xff1a;\u8ba9\u5e94\u7528\u5c3d\u91cf\u957f\u8fde\u63a5\/\u8fde\u63a5\u6c60\u590d\u7528<\/li>\n<\/ul>\n<hr \/>\n<h3>\u56db\u3001\u4ece\u201c\u75c7\u72b6 \u2192 \u6839\u56e0\u201d\u7684\u6392\u67e5\u8def\u5f84&#xff08;\u5efa\u8bae\u7167\u6284&#xff09;<\/h3>\n<h4>4.1 \u5148\u786e\u8ba4\u662f\u4e0d\u662f\u5e94\u7528\u6ca1\u590d\u7528\u8fde\u63a5<\/h4>\n<p><span class=\"token comment\"># \u770b\u67d0\u4e2a\u76ee\u7684\u7aef\u53e3\u7684\u8fde\u63a5\u72b6\u6001\u5206\u5e03&#xff08;\u4ee5 443 \u4e3a\u4f8b&#xff09;<\/span><br \/>\nss -tan <span class=\"token string\">&#039;( dport &#061; :443 )&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">awk<\/span> <span class=\"token string\">&#039;NR&gt;1{print $1}&#039;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">sort<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">uniq<\/span> -c <span class=\"token operator\">|<\/span> <span class=\"token function\">sort<\/span> -rn<\/p>\n<p><span class=\"token comment\"># \u770b\u67d0\u4e2a\u8fdb\u7a0b\u7684\u5bf9\u5916\u8fde\u63a5\u6570\u91cf<\/span><br \/>\n<span class=\"token assign-left variable\">pid<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&lt;<\/span>PID<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token function\">lsof<\/span> -p <span class=\"token string\">&#034;<span class=\"token variable\">$pid<\/span>&#034;<\/span> -nP <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> TCP <span class=\"token operator\">|<\/span> <span class=\"token function\">wc<\/span> -l<\/p>\n<p>\u5982\u679c\u8fde\u63a5\u5efa\u5f97\u975e\u5e38\u5feb\u3001TIME_WAIT \u591a\u3001\u800c\u4e14\u76ee\u7684\u5730\u96c6\u4e2d\u5728\u5c11\u6570\u51e0\u4e2a\u670d\u52a1&#xff0c;\u4f18\u5148\u6539\u5e94\u7528\u3002<\/p>\n<h4>4.2 \u5982\u679c\u662f\u7f51\u5173\/NAT&#xff0c;\u5148\u770b conntrack<\/h4>\n<p><span class=\"token function\">watch<\/span> -n <span class=\"token number\">1<\/span> <span class=\"token string\">&#039;echo -n &#034;count&#061;&#034;; cat \/proc\/sys\/net\/netfilter\/nf_conntrack_count; echo -n &#034; max&#061;&#034;; cat \/proc\/sys\/net\/netfilter\/nf_conntrack_max&#039;<\/span><\/p>\n<p>\u5982\u679c count \u6301\u7eed\u9876\u7740 max \u8dd1&#xff0c;\u5148\u522b\u5728\u4e1a\u52a1\u673a\u4e0a\u201c\u4e71\u8c03 sysctl\u201d&#xff0c;\u6839\u56e0\u53ef\u80fd\u5728\u7f51\u5173\u3002<\/p>\n<h4>4.3 \u6392\u9664 FD \u9650\u5236<\/h4>\n<p><span class=\"token assign-left variable\">pid<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token operator\">&lt;<\/span>PID<span class=\"token operator\">&gt;<\/span><br \/>\n<span class=\"token function\">cat<\/span> \/proc\/<span class=\"token string\">&#034;<span class=\"token variable\">$pid<\/span>&#034;<\/span>\/limits <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> -i <span class=\"token string\">&#039;open files&#039;<\/span><br \/>\n<span class=\"token function\">lsof<\/span> -p <span class=\"token string\">&#034;<span class=\"token variable\">$pid<\/span>&#034;<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">wc<\/span> -l<\/p>\n<p>\u5982\u679c lsof \u6570\u63a5\u8fd1\u4e0a\u9650&#xff0c;\u5148\u63d0 FD&#xff0c;\u518d\u770b\u8fde\u63a5\u590d\u7528\u3002<\/p>\n<hr \/>\n<h3>\u4e94\u3001\u843d\u5730\u4f18\u5316\u65b9\u6848&#xff08;\u6309\u4f18\u5148\u7ea7&#xff09;<\/h3>\n<h4>5.1 \u4f18\u5148\u7ea7A&#xff1a;\u5e94\u7528\u4fa7\u8fde\u63a5\u590d\u7528&#xff08;\u6536\u76ca\u6700\u5927\u3001\u98ce\u9669\u6700\u5c0f&#xff09;<\/h4>\n<ul>\n<li>HTTP \u5ba2\u6237\u7aef\u590d\u7528 &#043; \u8fde\u63a5\u6c60<\/li>\n<li>\u786e\u4fdd\u54cd\u5e94\u4f53\u6b63\u786e\u5173\u95ed\/\u8bfb\u5b8c<\/li>\n<li>\u5408\u7406\u7684\u8d85\u65f6\u4e0e\u91cd\u8bd5\u7b56\u7565&#xff08;\u907f\u514d\u201c\u8d85\u65f6\u2192\u91cd\u8fde\u98ce\u66b4\u201d&#xff09;<\/li>\n<\/ul>\n<h4>5.2 \u4f18\u5148\u7ea7B&#xff1a;\u6269\u5927\u7aef\u53e3\u6c60&#xff08;\u4e2d\u7b49\u6536\u76ca\u3001\u4f4e\u98ce\u9669&#xff09;<\/h4>\n<p>sysctl -w net.ipv4.ip_local_port_range<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;10000 65535&#034;<\/span><\/p>\n<h4>5.3 \u4f18\u5148\u7ea7C&#xff1a;\u9002\u5ea6\u5f00\u542f\u7aef\u53e3\u590d\u7528&#xff08;\u9700\u8981\u7070\u5ea6&#xff09;<\/h4>\n<p>sysctl -w net.ipv4.tcp_tw_reuse<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><\/p>\n<p>\u53ea\u5efa\u8bae\u5728\u201c\u5ba2\u6237\u7aef\u51fa\u5411\u77ed\u8fde\u63a5 &#043; \u5df2\u786e\u8ba4\u590d\u7528\u4ecd\u4e0d\u8db3\u201d\u7684\u573a\u666f\u4f7f\u7528&#xff0c;\u5e76\u7070\u5ea6\u9a8c\u8bc1\u3002<\/p>\n<h4>5.4 \u4f18\u5148\u7ea7D&#xff1a;\u7f51\u5173\/\u9632\u706b\u5899\/\u8282\u70b9 conntrack \u8c03\u4f18&#xff08;\u770b\u573a\u666f&#xff09;<\/h4>\n<p>\u589e\u5927\u8868&#xff1a;<\/p>\n<p>sysctl -w net.netfilter.nf_conntrack_max<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1048576<\/span><\/p>\n<p>\u540c\u65f6\u8981\u8bc4\u4f30\u5185\u5b58\u5360\u7528\u4e0e\u8d85\u65f6\u7b56\u7565&#xff08;\u4e0d\u540c\u53d1\u884c\u7248\u9ed8\u8ba4\u503c\u5dee\u5f02\u5f88\u5927&#xff09;&#xff0c;\u522b\u201c\u53ea\u52a0 max \u4e0d\u7ba1\u56de\u6536\u201d\u3002<\/p>\n<hr \/>\n<h3>\u516d\u3001\u4e00\u4efd\u901f\u67e5\u6e05\u5355&#xff08;\u6392\u67e5\u65f6\u76f4\u63a5\u5bf9\u7167&#xff09;<\/h3>\n<h4>6.1 \u73b0\u8c61 \u2192 \u53ef\u80fd\u539f\u56e0<\/h4>\n<table>\n<tr>\u73b0\u8c61\u5e38\u89c1\u539f\u56e0<\/tr>\n<tbody>\n<tr>\n<td>cannot assign requested address<\/td>\n<td>\u672c\u673a\u4e34\u65f6\u7aef\u53e3\u8017\u5c3d \/ TIME_WAIT \u592a\u591a<\/td>\n<\/tr>\n<tr>\n<td>too many open files<\/td>\n<td>FD \u4e0a\u9650\u4e0d\u591f \/ \u8fde\u63a5\u6cc4\u6f0f<\/td>\n<\/tr>\n<tr>\n<td>\u968f\u673a\u8d85\u65f6\u3001\u8de8\u7f51\u6bb5\u66f4\u660e\u663e<\/td>\n<td>\u7f51\u5173 conntrack \u6253\u6ee1 \/ NAT \u7aef\u53e3\u8017\u5c3d<\/td>\n<\/tr>\n<tr>\n<td>TIME_WAIT \u9ad8\u4f46\u670d\u52a1\u7aef\u4e5f\u6709\u95ee\u9898<\/td>\n<td>\u5ba2\u6237\u7aef\u590d\u7528\u5931\u8d25 &#043; \u670d\u52a1\u7aef\u77ed\u8fde\u63a5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>6.2 \u5fc5\u8dd1\u547d\u4ee4&#xff08;\u5efa\u8bae\u6536\u85cf&#xff09;<\/h4>\n<p>ss -s<br \/>\nss -tan state time-wait <span class=\"token operator\">|<\/span> <span class=\"token function\">wc<\/span> -l<br \/>\nsysctl net.ipv4.ip_local_port_range<br \/>\n<span class=\"token function\">cat<\/span> \/proc\/sys\/net\/netfilter\/nf_conntrack_count<br \/>\n<span class=\"token function\">cat<\/span> \/proc\/sys\/net\/netfilter\/nf_conntrack_max<\/p>\n<hr \/>\n<h3>\u603b\u7ed3<\/h3>\n<p>\u8fde\u63a5\u95ee\u9898\u6392\u67e5\u7684\u6838\u5fc3\u4e0d\u662f\u201c\u8c03\u5185\u6838\u53c2\u6570\u201d&#xff0c;\u800c\u662f&#xff1a;<\/p>\n<li>\u5148\u5b9a\u6027&#xff1a;\u7aef\u53e3\u8017\u5c3d \/ FD \u8017\u5c3d \/ conntrack \u8017\u5c3d<\/li>\n<li>\u5148\u6cbb\u672c&#xff1a;\u5e94\u7528\u4fa7\u8fde\u63a5\u590d\u7528\u4e0e\u8fde\u63a5\u6c60<\/li>\n<li>\u518d\u515c\u5e95&#xff1a;\u6269\u5927\u7aef\u53e3\u8303\u56f4\u3001\u8c28\u614e\u542f\u7528 tw_reuse<\/li>\n<li>\u522b\u5ffd\u7565\u7f51\u7edc\u8bbe\u5907&#xff1a;NAT\/\u7f51\u5173\u7684 conntrack \u4e0e SNAT \u7aef\u53e3\u540c\u6837\u4f1a\u6210\u4e3a\u74f6\u9888<\/li>\n<p>\u53ea\u8981\u6309\u8fd9\u4e2a\u987a\u5e8f\u505a&#xff0c;TIME_WAIT \u7206\u70b8\u548c\u7aef\u53e3\u8017\u5c3d\u57fa\u672c\u90fd\u80fd\u7a33\u4f4f&#xff0c;\u800c\u4e14\u4e0d\u4f1a\u5f15\u5165\u9690\u6027\u98ce\u9669\u3002<\/p>\n<hr \/>\n<p>\u66f4\u591a\u8fd0\u7ef4\u4e0e\u7f51\u7edc\u5b9e\u6218\u6587\u7ae0&#xff0c;\u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7&#xff1a;\u5317\u5e73\u7684\u79cb\u8475<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb844\u6b21\uff0c\u70b9\u8d5e25\u6b21\uff0c\u6536\u85cf11\u6b21\u3002\u7ebf\u4e0a\u6700\u201c\u7384\u5b66\u201d\u7684\u4e00\u7c7b\u6545\u969c\uff0c\u662f\u670d\u52a1\u672c\u8eab\u6ca1\u5d29\uff0c\u4f46\u5c31\u662f\u8fde\u4e0d\u4e0a\uff1a\u8bf7\u6c42\u5927\u91cf\u8d85\u65f6\u3001\u5076\u53d1\u3001\u7f51\u5173\/\u5e94\u7528\u62a5\uff0c\u91cd\u542f\u4e00\u4f1a\u513f\u53c8\u597d\u3002\u5f88\u591a\u65f6\u5019\uff0c\u8fd9\u4e0d\u662fCPU\u4e5f\u4e0d\u662f\u5185\u5b58\uff0c\u800c\u662f\u8fde\u63a5\u8d44\u6e90\u88ab\u8017\u5c3d\u4e86\u2014\u2014\u5178\u578b\u8868\u73b0\u662fTIME_WAIT \u7206\u70b8\u672c\u673a\u4e34\u65f6\u7aef\u53e3\uff08ephemeral ports\uff09\u8017\u5c3d\u3001\u6216\u8005conntrack 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