{"id":366,"date":"2014-05-23T16:34:15","date_gmt":"2014-05-23T16:34:15","guid":{"rendered":"5ef698cd9fe650923ea331c15af3b160"},"modified":"2014-05-23T16:34:15","modified_gmt":"2014-05-23T16:34:15","slug":"","status":"publish","type":"post","link":"https:\/\/www.xiaobo.li\/notes\/archives\/366","title":{"rendered":"Linux\u4e0b\u9ad8\u5e76\u53d1socket\u6700\u5927\u8fde\u63a5\u6570"},"content":{"rendered":"<p>Linux\u4e0b\u9ad8\u5e76\u53d1socket\u6700\u5927\u8fde\u63a5\u6570\u6240\u53d7\u7684\u9650\u5236\u95ee\u9898<\/p>\n<p><strong>\u3000\u30001\u3001\u4fee\u6539\u7528\u6237\u8fdb\u7a0b\u53ef\u6253\u5f00\u6587\u4ef6\u6570\u9650\u5236<\/strong><\/p>\n<p>\u3000\u3000\u5728Linux\u5e73\u53f0\u4e0a\uff0c\u65e0\u8bba\u7f16\u5199\u5ba2\u6237\u7aef\u7a0b\u5e8f\u8fd8\u662f\u670d\u52a1\u7aef\u7a0b\u5e8f\uff0c\u5728\u8fdb\u884c\u9ad8\u5e76\u53d1TCP\u8fde\u63a5\u5904\u7406\u65f6\uff0c\u6700\u9ad8\u7684\u5e76\u53d1\u6570\u91cf\u90fd\u8981\u53d7\u5230\u7cfb\u7edf\u5bf9\u7528\u6237\u5355\u4e00\u8fdb\u7a0b\u540c\u65f6\u53ef\u6253\u5f00\u6587\u4ef6\u6570\u91cf\u7684\u9650\u5236(\u8fd9\u662f\u56e0\u4e3a\u7cfb\u7edf\u4e3a\u6bcf\u4e2aTCP\u8fde\u63a5\u90fd\u8981\u521b\u5efa\u4e00\u4e2asocket\u53e5\u67c4\uff0c\u6bcf\u4e2asocket\u53e5\u67c4\u540c\u65f6\u4e5f\u662f\u4e00\u4e2a\u6587\u4ef6\u53e5\u67c4)\u3002\u53ef\u4f7f\u7528ulimit\u547d\u4ee4\u67e5\u770b\u7cfb\u7edf\u5141\u8bb8\u5f53\u524d\u7528\u6237\u8fdb\u7a0b\u6253\u5f00\u7684\u6587\u4ef6\u6570\u9650\u5236\uff1a<\/p>\n<p>\u3000\u3000[speng@as4 ~]$ ulimit -n<\/p>\n<p>\u3000\u30001024<\/p>\n<p>\u3000\u3000\u8fd9\u8868\u793a\u5f53\u524d\u7528\u6237\u7684\u6bcf\u4e2a\u8fdb\u7a0b\u6700\u591a\u5141\u8bb8\u540c\u65f6\u6253\u5f001024\u4e2a\u6587\u4ef6\uff0c\u8fd91024\u4e2a\u6587\u4ef6\u4e2d\u8fd8\u5f97\u9664\u53bb\u6bcf\u4e2a\u8fdb\u7a0b\u5fc5\u7136\u6253\u5f00\u7684\u6807\u51c6\u8f93\u5165\uff0c\u6807\u51c6\u8f93\u51fa\uff0c\u6807\u51c6\u9519\u8bef\uff0c\u670d\u52a1\u5668\u76d1\u542c socket,\u8fdb\u7a0b\u95f4\u901a\u8baf\u7684unix\u57dfsocket\u7b49\u6587\u4ef6\uff0c\u90a3\u4e48\u5269\u4e0b\u7684\u53ef\u7528\u4e8e\u5ba2\u6237\u7aefsocket\u8fde\u63a5\u7684\u6587\u4ef6\u6570\u5c31\u53ea\u6709\u5927\u69821024-10=1014\u4e2a\u5de6\u53f3\u3002\u4e5f\u5c31\u662f\u8bf4\u7f3a\u7701\u60c5\u51b5\u4e0b\uff0c\u57fa\u4e8eLinux\u7684\u901a\u8baf\u7a0b\u5e8f\u6700\u591a\u5141\u8bb8\u540c\u65f61014\u4e2aTCP\u5e76\u53d1\u8fde\u63a5\u3002<\/p>\n<p>\u3000\u3000\u5bf9\u4e8e\u60f3\u652f\u6301\u66f4\u9ad8\u6570\u91cf\u7684TCP\u5e76\u53d1\u8fde\u63a5\u7684\u901a\u8baf\u5904\u7406\u7a0b\u5e8f\uff0c\u5c31\u5fc5\u987b\u4fee\u6539Linux\u5bf9\u5f53\u524d\u7528\u6237\u7684\u8fdb\u7a0b\u540c\u65f6\u6253\u5f00\u7684\u6587\u4ef6\u6570\u91cf\u7684\u8f6f\u9650\u5236(soft limit)\u548c\u786c\u9650\u5236(hardlimit)\u3002\u5176\u4e2d\u8f6f\u9650\u5236\u662f\u6307Linux\u5728\u5f53\u524d\u7cfb\u7edf\u80fd\u591f\u627f\u53d7\u7684\u8303\u56f4\u5185\u8fdb\u4e00\u6b65\u9650\u5236\u7528\u6237\u540c\u65f6\u6253\u5f00\u7684\u6587\u4ef6\u6570;\u786c\u9650\u5236\u5219\u662f\u6839\u636e\u7cfb\u7edf\u786c\u4ef6\u8d44\u6e90\u72b6\u51b5(\u4e3b\u8981\u662f\u7cfb\u7edf\u5185\u5b58)\u8ba1\u7b97\u51fa\u6765\u7684\u7cfb\u7edf\u6700\u591a\u53ef\u540c\u65f6\u6253\u5f00\u7684\u6587\u4ef6\u6570\u91cf\u3002\u901a\u5e38\u8f6f\u9650\u5236\u5c0f\u4e8e\u6216\u7b49\u4e8e\u786c\u9650\u5236\u3002<\/p>\n<p>\u3000\u3000\u4fee\u6539\u4e0a\u8ff0\u9650\u5236\u7684\u6700\u7b80\u5355\u7684\u529e\u6cd5\u5c31\u662f\u4f7f\u7528ulimit\u547d\u4ee4\uff1a<\/p>\n<p>\u3000\u3000[speng@as4 ~]$ ulimit -n<\/p>\n<p>\u3000\u3000\u4e0a\u8ff0\u547d\u4ee4\u4e2d\uff0c\u5728\u4e2d\u6307\u5b9a\u8981\u8bbe\u7f6e\u7684\u5355\u4e00\u8fdb\u7a0b\u5141\u8bb8\u6253\u5f00\u7684\u6700\u5927\u6587\u4ef6\u6570\u3002\u5982\u679c\u7cfb\u7edf\u56de\u663e\u7c7b\u4f3c\u4e8e\"Operation notpermitted\"\u4e4b\u7c7b\u7684\u8bdd\uff0c\u8bf4\u660e\u4e0a\u8ff0\u9650\u5236\u4fee\u6539\u5931\u8d25\uff0c\u5b9e\u9645\u4e0a\u662f\u56e0\u4e3a\u5728\u4e2d\u6307\u5b9a\u7684\u6570\u503c\u8d85\u8fc7\u4e86Linux\u7cfb\u7edf\u5bf9\u8be5\u7528\u6237\u6253\u5f00\u6587\u4ef6\u6570\u7684\u8f6f\u9650\u5236\u6216\u786c\u9650\u5236\u3002\u56e0\u6b64\uff0c\u5c31\u9700\u8981\u4fee\u6539Linux\u7cfb\u7edf\u5bf9\u7528\u6237\u7684\u5173\u4e8e\u6253\u5f00\u6587\u4ef6\u6570\u7684\u8f6f\u9650\u5236\u548c\u786c\u9650\u5236\u3002<\/p>\n<p>\u3000\u3000\u7b2c\u4e00\u6b65\uff0c\u4fee\u6539\/etc\/security\/limits.conf\u6587\u4ef6\uff0c\u5728\u6587\u4ef6\u4e2d\u6dfb\u52a0\u5982\u4e0b\u884c\uff1a<\/p>\n<p>\u3000\u3000speng soft nofile 10240<\/p>\n<p>\u3000\u3000speng hard nofile 10240<\/p>\n<p>\u3000\u3000\u5176\u4e2dspeng\u6307\u5b9a\u4e86\u8981\u4fee\u6539\u54ea\u4e2a\u7528\u6237\u7684\u6253\u5f00\u6587\u4ef6\u6570\u9650\u5236\uff0c\u53ef\u7528'*'\u53f7\u8868\u793a\u4fee\u6539\u6240\u6709\u7528\u6237\u7684\u9650\u5236;<\/p>\n<p>\u3000\u3000soft\u6216hard\u6307\u5b9a\u8981\u4fee\u6539\u8f6f\u9650\u5236\u8fd8\u662f\u786c\u9650\u5236;10240\u5219\u6307\u5b9a\u4e86\u60f3\u8981\u4fee\u6539\u7684\u65b0\u7684\u9650\u5236\u503c\uff0c\u5373\u6700\u5927\u6253\u5f00\u6587\u4ef6\u6570(\u8bf7\u6ce8\u610f\u8f6f\u9650\u5236\u503c\u8981\u5c0f\u4e8e\u6216\u7b49\u4e8e\u786c\u9650\u5236)\u3002\u4fee\u6539\u5b8c\u540e\u4fdd\u5b58\u6587\u4ef6\u3002<\/p>\n<p>\u3000\u3000\u7b2c\u4e8c\u6b65\uff0c\u4fee\u6539\/etc\/pam.d\/login\u6587\u4ef6\uff0c\u5728\u6587\u4ef6\u4e2d\u6dfb\u52a0\u5982\u4e0b\u884c\uff1a<\/p>\n<p>\u3000\u3000session required \/lib\/security\/pam_limits.so \u8fd9\u662f\u544a\u8bc9Linux\u5728\u7528\u6237\u5b8c\u6210\u7cfb\u7edf\u767b\u5f55\u540e\uff0c\u5e94\u8be5\u8c03\u7528pam_limits.so\u6a21\u5757\u6765\u8bbe\u7f6e\u7cfb\u7edf\u5bf9\u8be5\u7528\u6237\u53ef\u4f7f\u7528\u7684\u5404\u79cd\u8d44\u6e90\u6570\u91cf\u7684\u6700\u5927\u9650\u5236(\u5305\u62ec\u7528\u6237\u53ef\u6253\u5f00\u7684\u6700\u5927\u6587\u4ef6\u6570\u9650\u5236)\uff0c\u800cpam_limits.so\u6a21\u5757\u5c31\u4f1a\u4ece\/etc\/security\/limits.conf\u6587\u4ef6\u4e2d\u8bfb\u53d6\u914d\u7f6e\u6765\u8bbe\u7f6e\u8fd9\u4e9b\u9650\u5236\u503c\u3002\u4fee\u6539\u5b8c\u540e\u4fdd\u5b58\u6b64\u6587\u4ef6\u3002<\/p>\n<p>\u3000\u3000\u7b2c\u4e09\u6b65\uff0c\u67e5\u770bLinux\u7cfb\u7edf\u7ea7\u7684\u6700\u5927\u6253\u5f00\u6587\u4ef6\u6570\u9650\u5236\uff0c\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\uff1a<\/p>\n<p>\u3000\u3000[speng@as4 ~]$ cat \/proc\/sys\/fs\/file-max<\/p>\n<p>\u3000\u300012158<\/p>\n<p>\u3000\u3000\u8fd9\u8868\u660e\u8fd9\u53f0Linux\u7cfb\u7edf\u6700\u591a\u5141\u8bb8\u540c\u65f6\u6253\u5f00(\u5373\u5305\u542b\u6240\u6709\u7528\u6237\u6253\u5f00\u6587\u4ef6\u6570\u603b\u548c)12158\u4e2a\u6587\u4ef6\uff0c\u662fLinux\u7cfb\u7edf\u7ea7\u786c\u9650\u5236\uff0c\u6240\u6709\u7528\u6237\u7ea7\u7684\u6253\u5f00\u6587\u4ef6\u6570\u9650\u5236\u90fd\u4e0d\u5e94\u8d85\u8fc7\u8fd9\u4e2a\u6570\u503c\u3002\u901a\u5e38\u8fd9\u4e2a\u7cfb\u7edf\u7ea7\u786c\u9650\u5236\u662fLinux\u7cfb\u7edf\u5728\u542f\u52a8\u65f6\u6839\u636e\u7cfb\u7edf\u786c\u4ef6\u8d44\u6e90\u72b6\u51b5\u8ba1\u7b97\u51fa\u6765\u7684\u6700\u4f73\u7684\u6700\u5927\u540c\u65f6\u6253\u5f00\u6587\u4ef6\u6570\u9650\u5236\uff0c\u5982\u679c\u6ca1\u6709\u7279\u6b8a\u9700\u8981\uff0c\u4e0d\u5e94\u8be5\u4fee\u6539\u6b64\u9650\u5236\uff0c\u9664\u975e\u60f3\u4e3a\u7528\u6237\u7ea7\u6253\u5f00\u6587\u4ef6\u6570\u9650\u5236\u8bbe\u7f6e\u8d85\u8fc7\u6b64\u9650\u5236\u7684\u503c\u3002<\/p>\n<p>\u3000\u3000\u4fee\u6539\u6b64\u786c\u9650\u5236\u7684\u65b9\u6cd5\u662f\u4fee\u6539\/etc\/rc.local\u811a\u672c\uff0c\u5728\u811a\u672c\u4e2d\u6dfb\u52a0\u5982\u4e0b\u884c\uff1a<\/p>\n<p>\u3000\u3000echo 22158 &gt; \/proc\/sys\/fs\/file-max<\/p>\n<p>\u3000\u3000\u8fd9\u662f\u8ba9Linux\u5728\u542f\u52a8\u5b8c\u6210\u540e\u5f3a\u884c\u5c06\u7cfb\u7edf\u7ea7\u6253\u5f00\u6587\u4ef6\u6570\u786c\u9650\u5236\u8bbe\u7f6e\u4e3a22158.\u4fee\u6539\u5b8c\u540e\u4fdd\u5b58\u6b64\u6587\u4ef6\u3002<\/p>\n<p>\u3000\u3000\u5b8c\u6210\u4e0a\u8ff0\u6b65\u9aa4\u540e\u91cd\u542f\u7cfb\u7edf\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\u5c31\u53ef\u4ee5\u5c06Linux\u7cfb\u7edf\u5bf9\u6307\u5b9a\u7528\u6237\u7684\u5355\u4e00\u8fdb\u7a0b\u5141\u8bb8\u540c\u65f6\u6253\u5f00\u7684\u6700\u5927\u6587\u4ef6\u6570\u9650\u5236\u8bbe\u4e3a\u6307\u5b9a\u7684\u6570\u503c\u3002\u5982\u679c\u91cd\u542f\u540e\u7528 ulimit-n\u547d\u4ee4\u67e5\u770b\u7528\u6237\u53ef\u6253\u5f00\u6587\u4ef6\u6570\u9650\u5236\u4ecd\u7136\u4f4e\u4e8e\u4e0a\u8ff0\u6b65\u9aa4\u4e2d\u8bbe\u7f6e\u7684\u6700\u5927\u503c\uff0c\u8fd9\u53ef\u80fd\u662f\u56e0\u4e3a\u5728\u7528\u6237\u767b\u5f55\u811a\u672c\/etc\/profile\u4e2d\u4f7f\u7528ulimit -n\u547d\u4ee4\u5df2\u7ecf\u5c06\u7528\u6237\u53ef\u540c\u65f6\u6253\u5f00\u7684\u6587\u4ef6\u6570\u505a\u4e86\u9650\u5236\u3002\u7531\u4e8e\u901a\u8fc7ulimit-n\u4fee\u6539\u7cfb\u7edf\u5bf9\u7528\u6237\u53ef\u540c\u65f6\u6253\u5f00\u6587\u4ef6\u7684\u6700\u5927\u6570\u9650\u5236\u65f6\uff0c\u65b0\u4fee\u6539\u7684\u503c\u53ea\u80fd\u5c0f\u4e8e\u6216\u7b49\u4e8e\u4e0a\u6b21 ulimit-n\u8bbe\u7f6e\u7684\u503c\uff0c\u56e0\u6b64\u60f3\u7528\u6b64\u547d\u4ee4\u589e\u5927\u8fd9\u4e2a\u9650\u5236\u503c\u662f\u4e0d\u53ef\u80fd\u7684\u3002<\/p>\n<p>\u3000\u3000\u6240\u4ee5\uff0c\u5982\u679c\u6709\u4e0a\u8ff0\u95ee\u9898\u5b58\u5728\uff0c\u5c31\u53ea\u80fd\u53bb\u6253\u5f00\/etc\/profile\u811a\u672c\u6587\u4ef6\uff0c\u5728\u6587\u4ef6\u4e2d\u67e5\u627e\u662f\u5426\u4f7f\u7528\u4e86ulimit-n\u9650\u5236\u4e86\u7528\u6237\u53ef\u540c\u65f6\u6253\u5f00\u7684\u6700\u5927\u6587\u4ef6\u6570\u91cf\uff0c\u5982\u679c\u627e\u5230\uff0c\u5219\u5220\u9664\u8fd9\u884c\u547d\u4ee4\uff0c\u6216\u8005\u5c06\u5176\u8bbe\u7f6e\u7684\u503c\u6539\u4e3a\u5408\u9002\u7684\u503c\uff0c\u7136\u540e\u4fdd\u5b58\u6587\u4ef6\uff0c\u7528\u6237\u9000\u51fa\u5e76\u91cd\u65b0\u767b\u5f55\u7cfb\u7edf\u5373\u53ef\u3002 \u901a\u8fc7\u4e0a\u8ff0\u6b65\u9aa4\uff0c\u5c31\u4e3a\u652f\u6301\u9ad8\u5e76\u53d1TCP\u8fde\u63a5\u5904\u7406\u7684\u901a\u8baf\u5904\u7406\u7a0b\u5e8f\u89e3\u9664\u5173\u4e8e\u6253\u5f00\u6587\u4ef6\u6570\u91cf\u65b9\u9762\u7684\u7cfb\u7edf\u9650\u5236\u3002<\/p>\n<p>&nbsp;<\/p>\n<p><strong>\u3000\u30002\u3001\u4fee\u6539\u7f51\u7edc\u5185\u6838\u5bf9TCP\u8fde\u63a5\u7684\u6709\u5173\u9650\u5236<\/strong><\/p>\n<p>\u3000\u3000\u5728Linux\u4e0a\u7f16\u5199\u652f\u6301\u9ad8\u5e76\u53d1TCP\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u901a\u8baf\u5904\u7406\u7a0b\u5e8f\u65f6\uff0c\u6709\u65f6\u4f1a\u53d1\u73b0\u5c3d\u7ba1\u5df2\u7ecf\u89e3\u9664\u4e86\u7cfb\u7edf\u5bf9\u7528\u6237\u540c\u65f6\u6253\u5f00\u6587\u4ef6\u6570\u7684\u9650\u5236\uff0c\u4f46\u4ecd\u4f1a\u51fa\u73b0\u5e76\u53d1TCP\u8fde\u63a5\u6570\u589e\u52a0\u5230\u4e00\u5b9a\u6570\u91cf\u65f6\uff0c\u518d\u4e5f\u65e0\u6cd5\u6210\u529f\u5efa\u7acb\u65b0\u7684TCP\u8fde\u63a5\u7684\u73b0\u8c61\u3002\u51fa\u73b0\u8fd9\u79cd\u73b0\u5728\u7684\u539f\u56e0\u6709\u591a\u79cd\u3002<\/p>\n<p>\u3000\u3000\u7b2c\u4e00\u79cd\u539f\u56e0\u53ef\u80fd\u662f\u56e0\u4e3aLinux\u7f51\u7edc\u5185\u6838\u5bf9\u672c\u5730\u7aef\u53e3\u53f7\u8303\u56f4\u6709\u9650\u5236\u3002\u6b64\u65f6\uff0c\u8fdb\u4e00\u6b65\u5206\u6790\u4e3a\u4ec0\u4e48\u65e0\u6cd5\u5efa\u7acbTCP\u8fde\u63a5\uff0c\u4f1a\u53d1\u73b0\u95ee\u9898\u51fa\u5728connect()\u8c03\u7528\u8fd4\u56de\u5931\u8d25\uff0c\u67e5\u770b\u7cfb\u7edf\u9519\u8bef\u63d0\u793a\u6d88\u606f\u662f\"Can't assign requestedaddress\".\u540c\u65f6\uff0c\u5982\u679c\u5728\u6b64\u65f6\u7528tcpdump\u5de5\u5177\u76d1\u89c6\u7f51\u7edc\uff0c\u4f1a\u53d1\u73b0\u6839\u672c\u6ca1\u6709TCP\u8fde\u63a5\u65f6\u5ba2\u6237\u7aef\u53d1SYN\u5305\u7684\u7f51\u7edc\u6d41\u91cf\u3002\u8fd9\u4e9b\u60c5\u51b5\u8bf4\u660e\u95ee\u9898\u5728\u4e8e\u672c\u5730Linux\u7cfb\u7edf\u5185\u6838\u4e2d\u6709\u9650\u5236\u3002<\/p>\n<p>\u3000\u3000\u5176\u5b9e\uff0c\u95ee\u9898\u7684\u6839\u672c\u539f\u56e0\u5728\u4e8eLinux\u5185\u6838\u7684TCP\/IP\u534f\u8bae\u5b9e\u73b0\u6a21\u5757\u5bf9\u7cfb\u7edf\u4e2d\u6240\u6709\u7684\u5ba2\u6237\u7aefTCP\u8fde\u63a5\u5bf9\u5e94\u7684\u672c\u5730\u7aef\u53e3\u53f7\u7684\u8303\u56f4\u8fdb\u884c\u4e86\u9650\u5236(\u4f8b\u5982\uff0c\u5185\u6838\u9650\u5236\u672c\u5730\u7aef\u53e3\u53f7\u7684\u8303\u56f4\u4e3a1024~32768\u4e4b\u95f4)\u3002\u5f53\u7cfb\u7edf\u4e2d\u67d0\u4e00\u65f6\u523b\u540c\u65f6\u5b58\u5728\u592a\u591a\u7684TCP\u5ba2\u6237\u7aef\u8fde\u63a5\u65f6\uff0c\u7531\u4e8e\u6bcf\u4e2aTCP\u5ba2\u6237\u7aef\u8fde\u63a5\u90fd\u8981\u5360\u7528\u4e00\u4e2a\u552f\u4e00\u7684\u672c\u5730\u7aef\u53e3\u53f7(\u6b64\u7aef\u53e3\u53f7\u5728\u7cfb\u7edf\u7684\u672c\u5730\u7aef\u53e3\u53f7\u8303\u56f4\u9650\u5236\u4e2d)\uff0c\u5982\u679c\u73b0\u6709\u7684TCP\u5ba2\u6237\u7aef\u8fde\u63a5\u5df2\u5c06\u6240\u6709\u7684\u672c\u5730\u7aef\u53e3\u53f7\u5360\u6ee1\uff0c\u5219\u6b64\u65f6\u5c31\u65e0\u6cd5\u4e3a\u65b0\u7684TCP\u5ba2\u6237\u7aef\u8fde\u63a5\u5206\u914d\u4e00\u4e2a\u672c\u5730\u7aef\u53e3\u53f7\u4e86\uff0c\u56e0\u6b64\u7cfb\u7edf\u4f1a\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5728connect()\u8c03\u7528\u4e2d\u8fd4\u56de\u5931\u8d25\uff0c\u5e76\u5c06\u9519\u8bef\u63d0\u793a\u6d88\u606f\u8bbe\u4e3a\"Can't assignrequested address\".<\/p>\n<p>\u3000\u3000\u6709\u5173\u8fd9\u4e9b\u63a7\u5236\u903b\u8f91\u53ef\u4ee5\u67e5\u770bLinux\u5185\u6838\u6e90\u4ee3\u7801\uff0c\u4ee5linux2.6\u5185\u6838\u4e3a\u4f8b\uff0c\u53ef\u4ee5\u67e5\u770btcp_ipv4.c\u6587\u4ef6\u4e2d\u5982\u4e0b\u51fd\u6570\uff1a<\/p>\n<p>\u3000\u3000static int tcp_v4_hash_connect(struct sock *sk)<\/p>\n<p>\u3000\u3000\u8bf7\u6ce8\u610f\u4e0a\u8ff0\u51fd\u6570\u4e2d\u5bf9\u53d8\u91cfsysctl_local_port_range\u7684\u8bbf\u95ee\u63a7\u5236\u3002\u53d8\u91cfsysctl_local_port_range\u7684\u521d\u59cb\u5316\u5219\u662f\u5728tcp.c\u6587\u4ef6\u4e2d\u7684\u5982\u4e0b\u51fd\u6570\u4e2d\u8bbe\u7f6e\uff1a<\/p>\n<p>\u3000\u3000void __init tcp_init(void)<\/p>\n<p>\u3000\u3000\u5185\u6838\u7f16\u8bd1\u65f6\u9ed8\u8ba4\u8bbe\u7f6e\u7684\u672c\u5730\u7aef\u53e3\u53f7\u8303\u56f4\u53ef\u80fd\u592a\u5c0f\uff0c\u56e0\u6b64\u9700\u8981\u4fee\u6539\u6b64\u672c\u5730\u7aef\u53e3\u8303\u56f4\u9650\u5236\u3002<\/p>\n<p>\u3000\u3000\u7b2c\u4e00\u6b65\uff0c\u4fee\u6539\/etc\/sysctl.conf\u6587\u4ef6\uff0c\u5728\u6587\u4ef6\u4e2d\u6dfb\u52a0\u5982\u4e0b\u884c\uff1a<\/p>\n<p>\u3000\u3000net.ipv4.ip_local_port_range = 1024 65000<\/p>\n<p>\u3000\u3000\u8fd9\u8868\u660e\u5c06\u7cfb\u7edf\u5bf9\u672c\u5730\u7aef\u53e3\u8303\u56f4\u9650\u5236\u8bbe\u7f6e\u4e3a1024~65000\u4e4b\u95f4\u3002\u8bf7\u6ce8\u610f\uff0c\u672c\u5730\u7aef\u53e3\u8303\u56f4\u7684\u6700\u5c0f\u503c\u5fc5\u987b\u5927\u4e8e\u6216\u7b49\u4e8e1024;\u800c\u7aef\u53e3\u8303\u56f4\u7684\u6700\u5927\u503c\u5219\u5e94\u5c0f\u4e8e\u6216\u7b49\u4e8e65535.\u4fee\u6539\u5b8c\u540e\u4fdd\u5b58\u6b64\u6587\u4ef6\u3002<\/p>\n<p>\u3000\u3000\u7b2c\u4e8c\u6b65\uff0c\u6267\u884csysctl\u547d\u4ee4\uff1a<\/p>\n<p>\u3000\u3000[speng@as4 ~]$ sysctl -p<\/p>\n<p>\u3000\u3000\u5982\u679c\u7cfb\u7edf\u6ca1\u6709\u9519\u8bef\u63d0\u793a\uff0c\u5c31\u8868\u660e\u65b0\u7684\u672c\u5730\u7aef\u53e3\u8303\u56f4\u8bbe\u7f6e\u6210\u529f\u3002\u5982\u679c\u6309\u4e0a\u8ff0\u7aef\u53e3\u8303\u56f4\u8fdb\u884c\u8bbe\u7f6e\uff0c\u5219\u7406\u8bba\u4e0a\u5355\u72ec\u4e00\u4e2a\u8fdb\u7a0b\u6700\u591a\u53ef\u4ee5\u540c\u65f6\u5efa\u7acb60000\u591a\u4e2aTCP\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n<p>\u3000\u3000\u7b2c\u4e8c\u79cd\u65e0\u6cd5\u5efa\u7acbTCP\u8fde\u63a5\u7684\u539f\u56e0\u53ef\u80fd\u662f\u56e0\u4e3aLinux\u7f51\u7edc\u5185\u6838\u7684IP_TABLE\u9632\u706b\u5899\u5bf9\u6700\u5927\u8ddf\u8e2a\u7684TCP\u8fde\u63a5\u6570\u6709\u9650\u5236\u3002\u6b64\u65f6\u7a0b\u5e8f\u4f1a\u8868\u73b0\u4e3a\u5728 connect()\u8c03\u7528\u4e2d\u963b\u585e\uff0c\u5982\u540c\u6b7b\u673a\uff0c\u5982\u679c\u7528tcpdump\u5de5\u5177\u76d1\u89c6\u7f51\u7edc\uff0c\u4e5f\u4f1a\u53d1\u73b0\u6839\u672c\u6ca1\u6709TCP\u8fde\u63a5\u65f6\u5ba2\u6237\u7aef\u53d1SYN\u5305\u7684\u7f51\u7edc\u6d41\u91cf\u3002\u7531\u4e8e IP_TABLE\u9632\u706b\u5899\u5728\u5185\u6838\u4e2d\u4f1a\u5bf9\u6bcf\u4e2aTCP\u8fde\u63a5\u7684\u72b6\u6001\u8fdb\u884c\u8ddf\u8e2a\uff0c\u8ddf\u8e2a\u4fe1\u606f\u5c06\u4f1a\u653e\u5728\u4f4d\u4e8e\u5185\u6838\u5185\u5b58\u4e2d\u7684conntrackdatabase\u4e2d\uff0c\u8fd9\u4e2a\u6570\u636e\u5e93\u7684\u5927\u5c0f\u6709\u9650\uff0c\u5f53\u7cfb\u7edf\u4e2d\u5b58\u5728\u8fc7\u591a\u7684TCP\u8fde\u63a5\u65f6\uff0c\u6570\u636e\u5e93\u5bb9\u91cf\u4e0d\u8db3\uff0cIP_TABLE\u65e0\u6cd5\u4e3a\u65b0\u7684TCP\u8fde\u63a5\u5efa\u7acb\u8ddf\u8e2a\u4fe1\u606f\uff0c\u4e8e\u662f\u8868\u73b0\u4e3a\u5728connect()\u8c03\u7528\u4e2d\u963b\u585e\u3002\u6b64\u65f6\u5c31\u5fc5\u987b\u4fee\u6539\u5185\u6838\u5bf9\u6700\u5927\u8ddf\u8e2a\u7684TCP\u8fde\u63a5\u6570\u7684\u9650\u5236\uff0c\u65b9\u6cd5\u540c\u4fee\u6539\u5185\u6838\u5bf9\u672c\u5730\u7aef\u53e3\u53f7\u8303\u56f4\u7684\u9650\u5236\u662f\u7c7b\u4f3c\u7684\uff1a<\/p>\n<p>\u3000\u3000\u7b2c\u4e00\u6b65\uff0c\u4fee\u6539\/etc\/sysctl.conf\u6587\u4ef6\uff0c\u5728\u6587\u4ef6\u4e2d\u6dfb\u52a0\u5982\u4e0b\u884c\uff1a<\/p>\n<p>\u3000\u3000net.ipv4.ip_conntrack_max = 10240<\/p>\n<p>\u3000\u3000\u8fd9\u8868\u660e\u5c06\u7cfb\u7edf\u5bf9\u6700\u5927\u8ddf\u8e2a\u7684TCP\u8fde\u63a5\u6570\u9650\u5236\u8bbe\u7f6e\u4e3a10240.\u8bf7\u6ce8\u610f\uff0c\u6b64\u9650\u5236\u503c\u8981\u5c3d\u91cf\u5c0f\uff0c\u4ee5\u8282\u7701\u5bf9\u5185\u6838\u5185\u5b58\u7684\u5360\u7528\u3002<\/p>\n<p>\u3000\u3000\u7b2c\u4e8c\u6b65\uff0c\u6267\u884csysctl\u547d\u4ee4\uff1a<\/p>\n<p>\u3000\u3000[speng@as4 ~]$ sysctl -p<\/p>\n<p>\u3000\u3000\u5982\u679c\u7cfb\u7edf\u6ca1\u6709\u9519\u8bef\u63d0\u793a\uff0c\u5c31\u8868\u660e\u7cfb\u7edf\u5bf9\u65b0\u7684\u6700\u5927\u8ddf\u8e2a\u7684TCP\u8fde\u63a5\u6570\u9650\u5236\u4fee\u6539\u6210\u529f\u3002\u5982\u679c\u6309\u4e0a\u8ff0\u53c2\u6570\u8fdb\u884c\u8bbe\u7f6e\uff0c\u5219\u7406\u8bba\u4e0a\u5355\u72ec\u4e00\u4e2a\u8fdb\u7a0b\u6700\u591a\u53ef\u4ee5\u540c\u65f6\u5efa\u7acb10000\u591a\u4e2aTCP\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n<p>\u3000\u30003\u3001\u4f7f\u7528\u652f\u6301\u9ad8\u5e76\u53d1\u7f51\u7edcI\/O\u7684\u7f16\u7a0b\u6280\u672f\u5728Linux\u4e0a\u7f16\u5199\u9ad8\u5e76\u53d1TCP\u8fde\u63a5\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u5fc5\u987b\u4f7f\u7528\u5408\u9002\u7684\u7f51\u7edcI\/O\u6280\u672f\u548cI\/O\u4e8b\u4ef6\u5206\u6d3e\u673a\u5236\u3002\u53ef\u7528\u7684I\/O\u6280\u672f\u6709\u540c\u6b65I\/O,\u975e\u963b\u585e\u5f0f\u540c\u6b65I\/O(\u4e5f\u79f0\u53cd\u5e94\u5f0fI\/O)\uff0c\u4ee5\u53ca\u5f02\u6b65I\/O.\u5728\u9ad8TCP\u5e76\u53d1\u7684\u60c5\u5f62\u4e0b\uff0c\u5982\u679c\u4f7f\u7528\u540c\u6b65I\/O,\u8fd9\u4f1a\u4e25\u91cd\u963b\u585e\u7a0b\u5e8f\u7684\u8fd0\u8f6c\uff0c\u9664\u975e\u4e3a\u6bcf\u4e2aTCP\u8fde\u63a5\u7684I\/O\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u3002<\/p>\n<p>\u3000\u3000\u4f46\u662f\uff0c\u8fc7\u591a\u7684\u7ebf\u7a0b\u53c8\u4f1a\u56e0\u7cfb\u7edf\u5bf9\u7ebf\u7a0b\u7684\u8c03\u5ea6\u9020\u6210\u5de8\u5927\u5f00\u9500\u3002\u56e0\u6b64\uff0c\u5728\u9ad8TCP\u5e76\u53d1\u7684\u60c5\u5f62\u4e0b\u4f7f\u7528\u540c\u6b65 I\/O\u662f\u4e0d\u53ef\u53d6\u7684\uff0c\u8fd9\u65f6\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u975e\u963b\u585e\u5f0f\u540c\u6b65I\/O\u6216\u5f02\u6b65I\/O.\u975e\u963b\u585e\u5f0f\u540c\u6b65I\/O\u7684\u6280\u672f\u5305\u62ec\u4f7f\u7528select()\uff0cpoll()\uff0cepoll\u7b49\u673a\u5236\u3002\u5f02\u6b65I\/O\u7684\u6280\u672f\u5c31\u662f\u4f7f\u7528AIO.<\/p>\n<p>\u3000\u3000\u4eceI\/O\u4e8b\u4ef6\u5206\u6d3e\u673a\u5236\u6765\u770b\uff0c\u4f7f\u7528select()\u662f\u4e0d\u5408\u9002\u7684\uff0c\u56e0\u4e3a\u5b83\u6240\u652f\u6301\u7684\u5e76\u53d1\u8fde\u63a5\u6570\u6709\u9650(\u901a\u5e38\u57281024\u4e2a\u4ee5\u5185)\u3002\u5982\u679c\u8003\u8651\u6027\u80fd\uff0cpoll()\u4e5f\u662f\u4e0d\u5408\u9002\u7684\uff0c\u5c3d\u7ba1\u5b83\u53ef\u4ee5\u652f\u6301\u7684\u8f83\u9ad8\u7684TCP\u5e76\u53d1\u6570\uff0c\u4f46\u662f\u7531\u4e8e\u5176\u91c7\u7528\"\u8f6e\u8be2\"\u673a\u5236\uff0c\u5f53\u5e76\u53d1\u6570\u8f83\u9ad8\u65f6\uff0c\u5176\u8fd0\u884c\u6548\u7387\u76f8\u5f53\u4f4e\uff0c\u5e76\u53ef\u80fd\u5b58\u5728I\/O\u4e8b\u4ef6\u5206\u6d3e\u4e0d\u5747\uff0c\u5bfc\u81f4\u90e8\u5206TCP\u8fde\u63a5\u4e0a\u7684I\/O\u51fa\u73b0\"\u9965\u997f\"\u73b0\u8c61\u3002\u800c\u5982\u679c\u4f7f\u7528epoll\u6216AIO,\u5219\u6ca1\u6709\u4e0a\u8ff0\u95ee\u9898(\u65e9\u671fLinux\u5185\u6838\u7684AIO\u6280\u672f\u5b9e\u73b0\u662f\u901a\u8fc7\u5728\u5185\u6838\u4e2d\u4e3a\u6bcf\u4e2a I\/O\u8bf7\u6c42\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u6765\u5b9e\u73b0\u7684\uff0c\u8fd9\u79cd\u5b9e\u73b0\u673a\u5236\u5728\u9ad8\u5e76\u53d1TCP\u8fde\u63a5\u7684\u60c5\u5f62\u4e0b\u4f7f\u7528\u5176\u5b9e\u4e5f\u6709\u4e25\u91cd\u7684\u6027\u80fd\u95ee\u9898\u3002\u4f46\u5728\u6700\u65b0\u7684Linux\u5185\u6838\u4e2d\uff0cAIO\u7684\u5b9e\u73b0\u5df2\u7ecf\u5f97\u5230\u6539\u8fdb)\u3002<\/p>\n<p>\u3000\u3000\u7efc\u4e0a\u6240\u8ff0\uff0c\u5728\u5f00\u53d1\u652f\u6301\u9ad8\u5e76\u53d1TCP\u8fde\u63a5\u7684Linux\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u5e94\u5c3d\u91cf\u4f7f\u7528epoll\u6216AIO\u6280\u672f\u6765\u5b9e\u73b0\u5e76\u53d1\u7684TCP\u8fde\u63a5\u4e0a\u7684I\/O\u63a7\u5236\uff0c\u8fd9\u5c06\u4e3a\u63d0\u5347\u7a0b\u5e8f\u5bf9\u9ad8\u5e76\u53d1TCP\u8fde\u63a5\u7684\u652f\u6301\u63d0\u4f9b\u6709\u6548\u7684I\/O\u4fdd\u8bc1\u3002<\/p>\n<p>\u3000\u3000\u5185\u6838\u53c2\u6570sysctl.conf\u7684\u4f18\u5316<\/p>\n<p>\u3000\u3000\/etc\/sysctl.conf \u662f\u7528\u6765\u63a7\u5236linux\u7f51\u7edc\u7684\u914d\u7f6e\u6587\u4ef6\uff0c\u5bf9\u4e8e\u4f9d\u8d56\u7f51\u7edc\u7684\u7a0b\u5e8f(\u5982web\u670d\u52a1\u5668\u548ccache\u670d\u52a1\u5668)\u975e\u5e38\u91cd\u8981\uff0cRHEL\u9ed8\u8ba4\u63d0\u4f9b\u7684\u6700\u597d\u8c03\u6574\u3002<\/p>\n<p>\u3000\u3000\u63a8\u8350\u914d\u7f6e(\u628a\u539f\/etc\/sysctl.conf\u5185\u5bb9\u6e05\u6389\uff0c\u628a\u4e0b\u9762\u5185\u5bb9\u590d\u5236\u8fdb\u53bb)\uff1a<\/p>\n<p>\u3000\u3000net.ipv4.ip_local_port_range = 1024 65535<\/p>\n<p>\u3000\u3000net.core.rmem_max=16777216<\/p>\n<p>\u3000\u3000net.core.wmem_max=16777216<\/p>\n<p>\u3000\u3000net.ipv4.tcp_rmem=4096 87380 16777216<\/p>\n<p>\u3000\u3000net.ipv4.tcp_wmem=4096 65536 16777216<\/p>\n<p>\u3000\u3000net.ipv4.tcp_fin_timeout = 10<\/p>\n<p>\u3000\u3000net.ipv4.tcp_tw_recycle = 1<\/p>\n<p>\u3000\u3000net.ipv4.tcp_timestamps = 0<\/p>\n<p>\u3000\u3000net.ipv4.tcp_window_scaling = 0<\/p>\n<p>\u3000\u3000net.ipv4.tcp_sack = 0<\/p>\n<p>\u3000\u3000net.core.netdev_max_backlog = 30000<\/p>\n<p>\u3000\u3000net.ipv4.tcp_no_metrics_save=1<\/p>\n<p>\u3000\u3000net.core.somaxconn = 262144<\/p>\n<p>\u3000\u3000net.ipv4.tcp_syncookies = 0<\/p>\n<p>\u3000\u3000net.ipv4.tcp_max_orphans = 262144<\/p>\n<p>\u3000\u3000net.ipv4.tcp_max_syn_backlog = 262144<\/p>\n<p>\u3000\u3000net.ipv4.tcp_synack_retries = 2<\/p>\n<p>\u3000\u3000net.ipv4.tcp_syn_retries = 2<\/p>\n<p>\u3000\u3000\u8fd9\u4e2a\u914d\u7f6e\u53c2\u8003\u4e8ecache\u670d\u52a1\u5668varnish\u7684\u63a8\u8350\u914d\u7f6e\u548cSunOne \u670d\u52a1\u5668\u7cfb\u7edf\u4f18\u5316\u7684\u63a8\u8350\u914d\u7f6e\u3002<\/p>\n<p>\u3000\u3000varnish\u8c03\u4f18\u63a8\u8350\u914d\u7f6e\u7684\u5730\u5740\u4e3a\uff1a<a href=\"http:\/\/varnish.projects.linpro.no\/wiki\/Performance\">http:\/\/varnish.projects.linpro.no\/wiki\/Performance<\/a><\/p>\n<p>\u3000\u3000\u4e0d\u8fc7varnish\u63a8\u8350\u7684\u914d\u7f6e\u662f\u6709\u95ee\u9898\u7684\uff0c\u5b9e\u9645\u8fd0\u884c\u8868\u660e\"net.ipv4.tcp_fin_timeout = 3\"\u7684\u914d\u7f6e\u4f1a\u5bfc\u81f4\u9875\u9762\u7ecf\u5e38\u6253\u4e0d\u5f00;\u5e76\u4e14\u5f53\u7f51\u53cb\u4f7f\u7528\u7684\u662fIE6\u6d4f\u89c8\u5668\u65f6\uff0c\u8bbf\u95ee\u7f51\u7ad9\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u6240\u6709\u7f51\u9875\u90fd\u4f1a<\/p>\n<p>\u3000\u3000\u6253\u4e0d\u5f00\uff0c\u91cd\u542f\u6d4f\u89c8\u5668\u540e\u6b63\u5e38\u3002\u53ef\u80fd\u662f\u56fd\u5916\u7684\u7f51\u901f\u5feb\u5427\uff0c\u6211\u4eec\u56fd\u60c5\u51b3\u5b9a\u9700\u8981\u8c03\u6574\"net.ipv4.tcp_fin_timeout = 10\",\u572810s\u7684\u60c5\u51b5\u4e0b\uff0c\u4e00\u5207\u6b63\u5e38(\u5b9e\u9645\u8fd0\u884c\u7ed3\u8bba)\u3002<\/p>\n<p>\u3000\u3000\u4fee\u6539\u5b8c\u6bd5\u540e\uff0c\u6267\u884c\uff1a<\/p>\n<p>\u3000\u3000\/sbin\/sysctl -p \/etc\/sysctl.conf<\/p>\n<p>\u3000\u3000\/sbin\/sysctl -w net.ipv4.route.flush=1<\/p>\n<p>\u3000\u3000\u547d\u4ee4\u751f\u6548\u3002\u4e3a\u4e86\u4fdd\u9669\u8d77\u89c1\uff0c\u4e5f\u53ef\u4ee5reboot\u7cfb\u7edf\u3002<\/p>\n<p>\u3000\u3000\u8c03\u6574\u6587\u4ef6\u6570\uff1a<\/p>\n<p>\u3000\u3000linux\u7cfb\u7edf\u4f18\u5316\u5b8c\u7f51\u7edc\u5fc5\u987b\u8c03\u9ad8\u7cfb\u7edf\u5141\u8bb8\u6253\u5f00\u7684\u6587\u4ef6\u6570\u624d\u80fd\u652f\u6301\u5927\u7684\u5e76\u53d1\uff0c\u9ed8\u8ba41024\u662f\u8fdc\u8fdc\u4e0d\u591f\u7684\u3002<\/p>\n<p>\u3000\u3000\u6267\u884c\u547d\u4ee4\uff1a<\/p>\n<p>\u3000\u3000Shell\u4ee3\u7801<\/p>\n<p>\u3000\u3000echo ulimit -HSn 65536 \u300b \/etc\/rc.local<\/p>\n<p>\u3000\u3000echo ulimit -HSn 65536 \u300b\/root\/.bash_profile<\/p>\n<p>\u3000\u3000ulimit -HSn 65536<\/p>\n<p>---------------------------------------<\/p>\n<p>net.ipv4.ip_local_port_range = 1024&nbsp;&nbsp;&nbsp;&nbsp; 61000<br \/>\nnet.core.rmem_max=16777216<br \/>\nnet.core.wmem_max=16777216<br \/>\nnet.ipv4.tcp_rmem=4096 87380 16777216<br \/>\nnet.ipv4.tcp_wmem=4096 65536 16777216<br \/>\nnet.ipv4.tcp_fin_timeout = 20<br \/>\nnet.ipv4.tcp_tw_recycle = 1<br \/>\nnet.ipv4.tcp_timestamps = 0<br \/>\nnet.ipv4.tcp_window_scaling = 0<br \/>\nnet.ipv4.tcp_sack = 0<br \/>\nnet.core.netdev_max_backlog = 30000<br \/>\nnet.ipv4.tcp_no_metrics_save=1<br \/>\nnet.core.somaxconn = 262144<br \/>\nnet.ipv4.tcp_syncookies = 0<br \/>\nnet.ipv4.tcp_max_orphans = 262144<br \/>\nnet.ipv4.tcp_max_syn_backlog = 262144<br \/>\nnet.ipv4.tcp_synack_retries = 2<br \/>\nnet.ipv4.tcp_syn_retries = 2<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linux\u4e0b\u9ad8\u5e76\u53d1socket\u6700\u5927\u8fde\u63a5\u6570\u6240\u53d7\u7684\u9650\u5236\u95ee\u9898<\/p>\n<p><strong>\u3000\u30001\u3001\u4fee\u6539\u7528\u6237\u8fdb\u7a0b\u53ef\u6253\u5f00\u6587\u4ef6\u6570\u9650\u5236<\/strong><\/p>\n<p>\u3000\u3000\u5728Linux\u5e73\u53f0\u4e0a\uff0c\u65e0\u8bba\u7f16\u5199\u5ba2\u6237\u7aef\u7a0b\u5e8f\u8fd8\u662f\u670d\u52a1\u7aef\u7a0b\u5e8f\uff0c\u5728\u8fdb\u884c\u9ad8\u5e76\u53d1TCP\u8fde\u63a5\u5904\u7406\u65f6\uff0c\u6700\u9ad8\u7684\u5e76\u53d1\u6570\u91cf\u90fd\u8981\u53d7\u5230\u7cfb\u7edf\u5bf9\u7528\u6237\u5355\u4e00\u8fdb\u7a0b\u540c\u65f6\u53ef\u6253\u5f00\u6587\u4ef6\u6570\u91cf\u7684\u9650\u5236(\u8fd9\u662f\u56e0\u4e3a\u7cfb\u7edf\u4e3a\u6bcf\u4e2aTCP\u8fde\u63a5\u90fd\u8981\u521b\u5efa\u4e00\u4e2asocket\u53e5\u67c4\uff0c\u6bcf\u4e2asocket\u53e5\u67c4\u540c\u65f6\u4e5f\u662f\u4e00\u4e2a\u6587\u4ef6\u53e5\u67c4)\u3002\u53ef\u4f7f\u7528ulimit\u547d\u4ee4\u67e5\u770b\u7cfb\u7edf\u5141\u8bb8\u5f53\u524d\u7528\u6237\u8fdb\u7a0b\u6253\u5f00\u7684\u6587\u4ef6\u6570\u9650\u5236\uff1a<\/p>\n<p>\u3000\u3000[speng@as4 ~]$ ulimit -n<\/p>\n<p>\u3000\u30001024<\/p>\n<p>\u3000\u3000\u8fd9\u8868\u793a\u5f53\u524d\u7528\u6237\u7684\u6bcf\u4e2a\u8fdb\u7a0b\u6700\u591a\u5141\u8bb8\u540c\u65f6\u6253\u5f001024\u4e2a\u6587\u4ef6\uff0c\u8fd91024\u4e2a\u6587\u4ef6\u4e2d\u8fd8\u5f97\u9664\u53bb\u6bcf\u4e2a\u8fdb\u7a0b\u5fc5\u7136\u6253\u5f00\u7684\u6807\u51c6\u8f93\u5165\uff0c\u6807\u51c6\u8f93\u51fa\uff0c\u6807...<\/p>\n<p> <a href=\"https:\/\/www.xiaobo.li\/notes\/archives\/366\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[287],"tags":[166],"class_list":["post-366","post","type-post","status-publish","format-standard","hentry","category-linux","tag-sysctl"],"_links":{"self":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/366","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/comments?post=366"}],"version-history":[{"count":0,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/366\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/media?parent=366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/categories?post=366"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/tags?post=366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}