{"id":36105,"date":"2025-03-26T14:17:40","date_gmt":"2025-03-26T06:17:40","guid":{"rendered":"https:\/\/www.yunshan.net\/blog\/?p=36105"},"modified":"2025-03-26T14:17:40","modified_gmt":"2025-03-26T06:17:40","slug":"ebpf%e5%9c%a8%e5%ae%b9%e5%99%a8%e6%8a%80%e6%9c%af%e4%b8%ad%e7%9a%84%e5%ba%94%e7%94%a8%e6%9c%89%e5%93%aa%e4%ba%9b%e4%bc%98%e5%8a%bf%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.yunshan.net\/blog\/archives\/36105.html","title":{"rendered":"eBPF\u5728\u5bb9\u5668\u6280\u672f\u4e2d\u7684\u5e94\u7528\u6709\u54ea\u4e9b\u4f18\u52bf\uff1f"},"content":{"rendered":"

\n

\"eBPF\u5728\u5bb9\u5668\u6280\u672f\u4e2d\u7684\u5e94\u7528\u6709\u54ea\u4e9b\u4f18\u52bf\uff1f\"<\/p>\n<\/p>\n

\n

\u5f53\u5bb9\u5668\u6280\u672f\u6210\u4e3a\u4e91\u539f\u751f\u67b6\u6784\u7684\u6838\u5fc3\u652f\u67f1\u65f6\uff0c\u5f00\u53d1\u8005\u4eec\u53d1\u73b0\u4f20\u7edf\u7684Linux\u5185\u6838\u5de5\u5177\u5df2\u96be\u4ee5\u5e94\u5bf9\u5fae\u670d\u52a1\u67b6\u6784\u4e0b\u9ad8\u5bc6\u5ea6\u3001\u9ad8\u52a8\u6001\u7684\u8fd0\u7ef4\u9700\u6c42\u3002\u4ece\u7f51\u7edc\u6027\u80fd\u74f6\u9888\u5230\u5b89\u5168\u76d1\u63a7\u76f2\u533a\uff0c\u4ece\u8d44\u6e90\u8c03\u5ea6\u5ef6\u8fdf\u5230\u53ef\u89c2\u6d4b\u6027\u788e\u7247\u5316\uff0c\u5bb9\u5668\u751f\u6001\u6b63\u9762\u4e34\u4e00\u573a\u6548\u80fd\u9769\u547d<\/strong>\u3002\u800c\u5728\u8fd9\u573a\u53d8\u9769\u4e2d\uff0ceBPF\uff08Extended Berkeley Packet Filter\uff09<\/strong>\u5982\u540c\u4e00\u628a\u745e\u58eb\u519b\u5200\uff0c\u6b63\u5728\u91cd\u5851\u5bb9\u5668\u6280\u672f\u7684\u5e95\u5c42\u80fd\u529b\u2014\u2014\u5b83\u5141\u8bb8\u5f00\u53d1\u8005\u5728\u65e0\u9700\u4fee\u6539\u5185\u6838\u4ee3\u7801\u7684\u524d\u63d0\u4e0b\uff0c\u5b89\u5168\u5730\u6ce8\u5165\u81ea\u5b9a\u4e49\u7a0b\u5e8f\uff0c\u4e3a\u5bb9\u5668\u63d0\u4f9b\u5b9e\u65f6\u89c2\u6d4b\u3001\u52a8\u6001\u8fc7\u6ee4\u3001\u7cbe\u51c6\u63a7\u5236<\/strong>\u7684\u80fd\u529b\u3002\u8fd9\u79cd\u6280\u672f\u8303\u5f0f\u7684\u8f6c\u53d8\uff0c\u4e0d\u4ec5\u8ba9Kubernetes\u7b49\u5bb9\u5668\u7f16\u6392\u7cfb\u7edf\u7684\u6027\u80fd\u63d0\u5347\u4e8610\u500d\uff0c\u66f4\u50ac\u751f\u51faCilium\u3001Falco\u7b49\u98a0\u8986\u6027\u5de5\u5177\u94fe\u3002<\/p>\n

\n

\u4e00\u3001\u98a0\u8986\u4f20\u7edf\uff1aeBPF\u5982\u4f55\u91cd\u6784\u5bb9\u5668\u7f51\u7edc\u6027\u80fd<\/strong><\/h3>\n

\u5728\u5bb9\u5668\u96c6\u7fa4\u4e2d\uff0c\u7f51\u7edc\u6027\u80fd\u5e38\u5e38\u53d7\u9650\u4e8e\u4f20\u7edfiptables\u89c4\u5219\u94fe\u7684\u7ebf\u6027\u5904\u7406\u673a\u5236\u3002\u5f53\u96c6\u7fa4\u89c4\u6a21\u6269\u5c55\u5230\u6570\u5343\u8282\u70b9\u65f6\uff0ciptables\u7684\u89c4\u5219\u5339\u914d\u6548\u7387\u5448\u73b0\u6307\u6570\u7ea7\u4e0b\u964d\u3002eBPF\u901a\u8fc7\u7ed5\u8fc7\u5185\u6838\u534f\u8bae\u6808\u7684\u5197\u4f59\u8def\u5f84\uff0c\u76f4\u63a5\u5c06\u7f51\u7edc\u5305\u5904\u7406\u903b\u8f91\u6ce8\u5165\u5230\u6570\u636e\u5e73\u9762<\/strong>\uff0c\u5b9e\u73b0\u4e86\u7f51\u7edc\u4f20\u8f93\u7684\u201c\u8d85\u8f66\u9053\u201d\u3002<\/p>\n

\u4ee5CNCF\u5b75\u5316\u7684Cilium\u9879\u76ee\u4e3a\u4f8b\uff0c\u5176\u57fa\u4e8eeBPF\u7684Host-Reachable Services<\/strong>\u673a\u5236\uff0c\u5c06Kubernetes Service\u7684IPVS\u8f6c\u53d1\u6548\u7387\u63d0\u5347400%\u3002\u901a\u8fc7eBPF\u7a0b\u5e8f\u5728\u7f51\u5361\u9a71\u52a8\u5c42\u7684\u96f6\u62f7\u8d1d\uff08Zero-Copy\uff09\u5904\u7406\uff0c\u5bb9\u5668\u95f4\u7684TCP\u901a\u4fe1\u5ef6\u8fdf\u4ece\u6beb\u79d2\u7ea7\u9aa4\u964d\u5230\u5fae\u79d2\u7ea7\u3002\u66f4\u5173\u952e\u7684\u662f\uff0ceBPF\u652f\u6301\u52a8\u6001\u52a0\u8f7d\u548c\u5378\u8f7d\u7a0b\u5e8f<\/strong>\uff0c\u8fd9\u4f7f\u5f97\u7f51\u7edc\u7b56\u7565\u7684\u66f4\u65b0\u65e0\u9700\u91cd\u542f\u5bb9\u5668\u6216\u8282\u70b9\uff0c\u5b8c\u7f8e\u9002\u914dKubernetes\u7684\u5f39\u6027\u6269\u7f29\u5bb9\u573a\u666f\u3002<\/p>\n

\n

\u4e8c\u3001\u6df1\u5ea6\u900f\u89c6\uff1a\u6253\u7834\u5bb9\u5668\u53ef\u89c2\u6d4b\u6027\u7684\u9ed1\u7bb1<\/strong><\/h3>\n

\u4f20\u7edf\u76d1\u63a7\u5de5\u5177\u5982top\u3001netstat\u5728\u5bb9\u5668\u5316\u73af\u5883\u4e2d\u5b58\u5728\u81f4\u547d\u7f3a\u9677\u2014\u2014\u5b83\u4eec\u65e0\u6cd5\u611f\u77e5Linux\u547d\u540d\u7a7a\u95f4\u7684\u9694\u79bb\u8fb9\u754c\u3002\u5f53\u5bb9\u5668\u53d1\u751f\u6027\u80fd\u6296\u52a8\u65f6\uff0c\u8fd0\u7ef4\u4eba\u5458\u5f80\u5f80\u9700\u8981\u50cf\u201c\u8003\u53e4\u5b66\u5bb6\u201d\u4e00\u6837\u62fc\u63a5cAdvisor\u3001Prometheus<\/a>\u3001kubelet\u7b49\u591a\u6e90\u6570\u636e\u3002eBPF\u7684Hook\u70b9\u904d\u5e03\u5185\u6838\u8c03\u5ea6\u3001\u6587\u4ef6\u7cfb\u7edf\u3001\u7f51\u7edc\u6808\u7b49\u5173\u952e\u8def\u5f84<\/strong>\uff0c\u4f7f\u5f97\u5f00\u53d1\u8005\u53ef\u4ee5\u6355\u83b7\u5305\u62ec\u7cfb\u7edf\u8c03\u7528\u3001TCP\u91cd\u4f20\u3001\u5757I\/O\u5ef6\u8fdf\u5728\u5185\u7684200+\u79cd\u6307\u6807\u3002<\/p>\n

Linux\u57fa\u91d1\u4f1a\u7684\u7814\u7a76\u8868\u660e\uff0c\u57fa\u4e8eeBPF\u7684BCC\u5de5\u5177\u96c6\u80fd\u5c06\u5bb9\u5668\u6545\u969c\u6839\u56e0\u5206\u6790<\/a><\/a>\u65f6\u95f4\u7f29\u77ed83%\u3002\u4f8b\u5982\uff0c\u5f00\u6e90\u9879\u76eePixie\u901a\u8fc7eBPF\u81ea\u52a8\u5173\u8054\u5bb9\u5668PID\u4e0eKubernetes\u5143\u6570\u636e\uff0c\u76f4\u63a5\u5c55\u793a\u67d0Deployment\u7684HTTP 499\u9519\u8bef\u4e0e\u540e\u7aefRedis\u6162\u67e5\u8be2\u7684\u56e0\u679c\u5173\u7cfb\u3002\u8fd9\u79cd\u5168\u6808\u3001\u5b9e\u65f6\u3001\u65e0\u4fb5\u5165\u7684\u89c2\u6d4b\u80fd\u529b<\/strong>\uff0c\u8ba9\u201c\u8c03\u8bd5\u751f\u4ea7\u73af\u5883\u201d\u4e0d\u518d\u662f\u4e00\u53e5\u73a9\u7b11\u3002<\/p>\n

\n

\u4e09\u3001\u5b89\u5168\u8fdb\u5316\uff1a\u4ece\u9759\u6001\u89c4\u5219\u5230\u52a8\u6001\u884c\u4e3a\u9632\u62a4<\/strong><\/h3>\n

\u5bb9\u5668\u5b89\u5168\u66fe\u957f\u671f\u4f9d\u8d56\u57fa\u4e8e\u7b7e\u540d\u7684\u9759\u6001\u68c0\u6d4b\uff0c\u8fd9\u79cd\u201c\u9a6c\u5947\u8bfa\u9632\u7ebf\u201d\u5728\u96f6\u65e5\u6f0f\u6d1e\u9762\u524d\u5f62\u540c\u865a\u8bbe\u3002eBPF\u4f7f\u5f97\u5185\u6838\u7ea7\u5b89\u5168\u7b56\u7565\u80fd\u591f\u7406\u89e3\u5e94\u7528\u8bed\u4e49<\/strong>\u2014\u2014\u5f53\u67d0\u4e2a\u5bb9\u5668\u8fdb\u7a0b\u7a81\u7136\u8c03\u7528fork()\u521b\u5efa\u5b50\u8fdb\u7a0b\u5e76\u8fde\u63a5\u975e\u5e38\u89c4\u7aef\u53e3\u65f6\uff0ceBPF\u7a0b\u5e8f\u53ef\u4ee5\u5b9e\u65f6\u963b\u65ad\u8be5\u884c\u4e3a\u5e76\u89e6\u53d1\u544a\u8b66\u3002<\/p>\n

Aqua Security\u7684\u5b9e\u9a8c\u6570\u636e\u663e\u793a\uff0c\u57fa\u4e8eeBPF\u7684\u5bb9\u5668\u8fd0\u884c\u65f6\u9632\u62a4\u65b9\u6848\uff0c\u5c06\u6f0f\u6d1e\u5229\u7528\u653b\u51fb\u7684\u68c0\u6d4b\u8986\u76d6\u7387\u4ece\u4f20\u7edf\u65b9\u6848\u768467%\u63d0\u5347\u81f394%\u3002\u66f4\u503c\u5f97\u5173\u6ce8\u7684\u662f\uff0ceBPF\u4e0eLinux\u5b89\u5168\u6a21\u5757\uff08LSM\uff09\u7684\u6df1\u5ea6\u6574\u5408\uff0c\u8ba9\u96f6\u4fe1\u4efb\u5b89\u5168\u6a21\u578b<\/strong>\u5728\u5bb9\u5668\u5c42\u771f\u6b63\u843d\u5730\u3002\u4f8b\u5982\uff0c\u8c37\u6b4c\u7684gVisor\u9879\u76ee\u901a\u8fc7eBPF\u5b9e\u73b0\u7528\u6237\u6001\u5185\u6838\u7684\u7cfb\u7edf\u8c03\u7528\u8fc7\u6ee4\uff0c\u4f7f\u5f97\u5373\u4f7f\u5bb9\u5668\u7a81\u7834\u9694\u79bb\uff0c\u653b\u51fb\u8005\u4e5f\u65e0\u6cd5\u6267\u884c\u7279\u6743\u6307\u4ee4\u3002<\/p>\n

\n

\u56db\u3001\u6548\u80fd\u9769\u547d\uff1a\u5f53\u8d44\u6e90\u8c03\u5ea6\u9047\u89c1\u667a\u80fd\u611f\u77e5<\/strong><\/h3>\n

\u5728\u6df7\u90e8\u573a\u666f\u4e0b\uff0c\u5bb9\u5668\u8d44\u6e90\u7684\u8d85\u5356\u4e0e\u4e89\u7528\u53ef\u80fd\u5bfc\u81f4\u201c\u8d44\u6e90\u8e29\u8e0f\u201d\u3002\u4f20\u7edfcgroups\u867d\u7136\u80fd\u8fdb\u884cCPU\/\u5185\u5b58\u7684\u786c\u9650\u5236\uff0c\u4f46\u7f3a\u4e4f\u5bf9\u771f\u5b9e\u8d1f\u8f7d\u7684\u5f39\u6027\u54cd\u5e94\u3002eBPF\u7a0b\u5e8f\u53ef\u5b9e\u65f6\u8ffd\u8e2a\u8fdb\u7a0b\u7684\u8c03\u5ea6\u5ef6\u8fdf\u3001\u5185\u5b58\u7f3a\u9875\u5f02\u5e38\u7b49\u5fae\u89c2\u6307\u6807<\/strong>\uff0c\u5e76\u4e0eKubernetes\u8c03\u5ea6\u5668\u8054\u52a8\u5b9e\u73b0\u9884\u6d4b\u6027\u8d44\u6e90\u5206\u914d\u3002<\/p>\n

Facebook\u7684\u6848\u4f8b\u5206\u6790\u63ed\u793a\uff0c\u5176\u57fa\u4e8eeBPF\u5f00\u53d1\u7684pFSAgent<\/strong>\u7ec4\u4ef6\uff0c\u901a\u8fc7\u5206\u6790\u5bb9\u5668\u8fdb\u7a0b\u7684\u7f3a\u9875\u4e2d\u65ad\u9891\u7387\uff0c\u52a8\u6001\u8c03\u6574\u5185\u5b58\u5927\u9875\uff08HugePage\uff09\u5206\u914d\u7b56\u7565\uff0c\u4f7fJava\u5e94\u7528\u7684GC\u505c\u987f\u65f6\u95f4\u51cf\u5c1140%\u3002\u5728\u5b58\u50a8\u9886\u57df\uff0c\u5f00\u6e90\u9879\u76eeBPFBox\u5229\u7528eBPF\u5b9e\u73b0\u5bb9\u5668\u6587\u4ef6\u8bbf\u95ee\u7684\u201c\u7eb3\u7c73\u7ea7\u5ba1\u8ba1\u201d\uff0c\u7cbe\u51c6\u8bc6\u522b\u5f02\u5e38IO\u6a21\u5f0f\u5e76\u81ea\u52a8\u9650\u6d41\u3002<\/p>\n

\n

\u4e94\u3001\u672a\u6765\u84dd\u56fe\uff1aeBPF\u4e0e\u5bb9\u5668\u751f\u6001\u7684\u5171\u751f\u8fdb\u5316<\/strong><\/h3>\n

\u968f\u77402023\u5e74Linux 6.1\u5185\u6838\u5c06eBPF\u7684\u73af\u5f62\u7f13\u51b2\u533a\uff08Ring Buffer\uff09\u6027\u80fd\u63d0\u53475\u500d\uff0c\u8fd9\u9879\u6280\u672f\u6b63\u5728\u7a81\u7834\u6700\u540e\u7684\u6027\u80fd\u74f6\u9888\u3002\u5728\u670d\u52a1\u7f51\u683c\u9886\u57df\uff0cCilium Service Mesh\u901a\u8fc7eBPF\u66ff\u4ee3Envoy\u7684Sidecar\u4ee3\u7406\uff0c\u5c06\u670d\u52a1\u95f4\u901a\u4fe1\u7684\u5ef6\u8fdf\u4ece2ms\u964d\u81f30.5ms\u3002\u66f4\u4e3a\u6fc0\u8fdb\u7684\u662f\uff0c\u5fae\u8f6f\u63d0\u51fa\u7684eBPF for Windows<\/strong>\u8ba1\u5212\uff0c\u6b63\u8bd5\u56fe\u5c06\u8fd9\u79cd\u80fd\u529b\u6269\u5c55\u5230\u975eLinux\u5bb9\u5668\u8fd0\u884c\u65f6\u3002<\/p>\n

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