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wp-image-1316\" src=\"http:\/\/47.94.246.125\/wp-content\/uploads\/2019\/01\/2-1.jpg\" alt=\"\" width=\"598\" height=\"361\" \/>\u56fe2 K8S\u63a7\u5236\u5668\u67b6\u6784\u6a21\u5f0f<\/p>\n\n\n<strong>\u63a7\u5236\u5668\u67b6\u6784\u6a21\u5f0f<\/strong>\uff1a\u4e00\u4e2a\u5178\u578b\u7684\u63a7\u5236\u5668\u5b9e\u73b0\u901a\u8fc7API server\u7684List-Watch\u673a\u5236\u7684\u5ba2\u6237\u7aefinformer\u4e0eAPI server\u4fdd\u6301\u4ea4\u4e92\uff0c\u8ddf\u8e2a\u7279\u5b9a\u7684\u8d44\u6e90\u5bf9\u8c61\u7684\u72b6\u6001\u4e0e\u53d8\u5316\u3002\u5bf9\u8c61\u53d8\u5316\u7684\u4e8b\u4ef6\u7531informer\u8c03\u7528\u76f8\u5e94\u7684callback\u5b8c\u6210\u4e00\u4e9b\u57fa\u672c\u7684\u5904\u7406\uff0c\u7136\u540e\u628a\u76f8\u5173\u7684\u53d8\u66f4\u53ca\u5bf9\u8c61\u4fe1\u606f\u653e\u5230workqueue\u91cc\u9762\u3002\u63a7\u5236\u5668\u7684\u5e94\u7528\u903b\u8f91\u5b9e\u73b0\u5728worker\u534f\u7a0b\u91cc\u9762\u3002\u63a7\u5236\u5668\u53ef\u542f\u52a8\u591a\u4e2aworker\u534f\u7a0b\u6765\u5904\u7406workqueue\u91cc\u7684\u5bf9\u8c61\u4e8b\u4ef6\u3002\u6839\u636e\u5bf9\u8c61\u7684\u671f\u671b\u72b6\u6001\u548c\u5f53\u524d\u7cfb\u7edf\u7684\u5b9e\u9645\u60c5\u51b5\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\uff0c\u5e76\u901a\u8fc7clients\u5411API server\u53d1\u9001\u884c\u52a8\u8bf7\u6c42\u3002\u5b9e\u9645\u4e0a\u4e5f\u662f\u901a\u8fc7\u5bf9\u5176\u4ed6\u76f8\u5173\u4e0b\u6e38\u8d44\u6e90\u5bf9\u8c61\u7684\u8bbe\u7f6e\uff0c\u4ee5\u5b9e\u73b0\u6574\u4e2a\u96c6\u7fa4\u5411\u671f\u671b\u7684\u72b6\u6001\u6f14\u8fdb\u3002\u6b64\u5916\uff0c\u4e3a\u7f13\u89e3\u5404\u7ec4\u4ef6\u6a21\u5757\u5bf9API server\u7684\u8bbf\u95ee\u538b\u529b\u3001\u63d0\u9ad8\u5904\u7406\u6027\u80fd\uff0c\u63a7\u5236\u5668\u7684\u5185\u90e8\u5b9e\u73b0\u4e5f\u90fd\u91c7\u7528\u4e86\u7f13\u5b58\u673a\u5236\u7684\u652f\u6301\u3002\n\n<strong>kube-controller-manager<\/strong>\uff1aK8S\u5185\u7f6e\u4e86\u4e00\u7cfb\u5217\u7684\u63a7\u5236\u5668\uff0c\u57fa\u672c\u4e0a\u90fd\u662f\u5d4c\u5165\u5728controller-manager\u8fdb\u7a0b\u91cc\u7684\u3002\u5176\u4e2d\uff0cReplication Controller\u7684\u529f\u80fd\u662f\u786e\u4fdd\u96c6\u7fa4\u4e2d\u6709\u4e14\u4ec5\u6709\u6307\u5b9a\u4e2a\u6570\u7684Pod\u5b9e\u4f8b\u5728\u8fd0\u884c\uff0c\u53ef\u4ee5\u901a\u8fc7\u8c03\u6574RC\u4e2d\u7684\u526f\u672c\u6570\u91cf\u6765\u5b9e\u73b0\u7cfb\u7edf\u6269\u5bb9\u6216\u7f29\u5bb9\uff0c\u901a\u8fc7\u6539\u53d8RC\u4e2d\u7684Pod\u6a21\u677f\u6765\u5b9e\u73b0\u7cfb\u7edf\u7684\u6eda\u52a8\u5347\u7ea7\uff1bEndpoints Controller\u4e2d\u7684Endpoints\u8868\u793a\u67d0\u4e2aService\u5bf9\u5e94\u7684\u6240\u6709Pod\u526f\u672c\u7684\u8bbf\u95ee\u5730\u5740\u3002\u6b64\u63a7\u5236\u5668\u7684\u529f\u80fd\u662f\u901a\u8fc7\u76d1\u542cService\u548c\u5bf9\u5e94\u7684Pod\u526f\u672c\u7684\u53d8\u5316\uff0c\u8d1f\u8d23\u751f\u6210\u548c\u7ef4\u62a4\u6240\u6709Endpoints\u5bf9\u8c61\u3002\u800c\u5de5\u4f5c\u8282\u70b9\u4e0a\u7684kube-proxy\u5c31\u662f\u901a\u8fc7\u76d1\u542cService\u548cEndpoints\u6765\u914d\u7f6e\u76f8\u5e94\u7684\u6570\u636e\u9762\u5b9e\u73b0\u76f8\u5e94\u7684\u8f6c\u53d1\u548c\u8d1f\u8f7d\u5747\u8861\u529f\u80fd\u3002\u6211\u4eec\u53ef\u4ee5\u7406\u89e3Endpoints Controller\u662fK8S\u9664Pod\u4ee5\u5916\u6700\u91cd\u8981\u7684\u8d44\u6e90\u5bf9\u8c61\u670d\u52a1Service\u7684\u96c6\u7fa4\u5c42\u9762\u7684\u63a7\u5236\u5668\uff0c\u800ckube-proxy\u5219\u662f\u76f8\u5e94\u8282\u70b9\u5c42\u9762\u7684\u63a7\u5236\u5668\uff1bNamespace Controller\u7684\u529f\u80fd\u662f\u5728\u540e\u53f0\u5b9e\u73b0\u4f18\u96c5\u5730\u5220\u9664\u67d0Namespace\u4e0b\u7684Service Account\u3001RC\u3001Pod\u7b49\u8d44\u6e90\u5bf9\u8c61\u53ca\u6b64Namespace\u672c\u8eab\uff1bService Accounts Controller\u7684\u529f\u80fd\u662f\u4e3a\u6bcf\u4e2aNamespace\u7ef4\u62a4\u4e00\u4e2a\u9ed8\u8ba4\u7684Service Account\uff0c\u5e76\u4e0eToken Controller\u914d\u5408\u5b9e\u73b0K8S\u96c6\u7fa4\u5185\u90e8Pod\u8bbf\u95eeAPI server\u7684\u8ba4\u8bc1\u529f\u80fd\u3002\n\nK8S\u9664\u672c\u8eab\u5185\u7f6e\u7684\u8fd9\u4e9b\u63a7\u5236\u5668\u5916\uff0c\u4e5f\u652f\u6301\u5404\u79cd\u7528\u6237\u81ea\u5b9a\u4e49\u6269\u5c55\u3002\u63a7\u5236\u5668\u53ef\u4ee5\u8fd0\u884c\u5728K8S\u4e3b\u8282\u70b9\u4e0a\uff0c\u4e5f\u53ef\u4ee5\u8fd0\u884c\u5728\u5de5\u4f5c\u8282\u70b9\u4e0a\uff1b\u53ef\u4ee5\u8fd0\u884c\u5728K8S\u96c6\u7fa4\u5185\uff0c\u751a\u81f3\u8fd0\u884c\u5728\u96c6\u7fa4\u5916\u3002\n\n\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1317\" src=\"https:\/\/www.yunshan.net\/blog\/wp-content\/uploads\/2019\/01\/3.jpg\" alt=\"\" width=\"854\" height=\"540\" \/>\u56fe3 Pod\u8c03\u5ea6\u3001\u521b\u5efa\u3001CNI-Plugin\u6302\u63a5\u5bb9\u5668\u7f51\u7edc\u7684\u5904\u7406\u65f6\u5e8f<\/p>\n\n\n\n\n\n<h4 id=\"toc_3\">Pod\u5904\u7406\u7ec4\u4ef6\u4e0e\u529f\u80fd<\/h4>\n\n\n\u57fa\u672c\u4e0aK8S\u7684\u8d44\u6e90\u5bf9\u8c61\u4e0e\u63a7\u5236\u5668\u90fd\u662f\u76f8\u4e92\u5bf9\u5e94\u3001\u914d\u5408\u8d77\u6765\u5b8c\u6210\u76f8\u5e94\u7684\u529f\u80fd\u7684\u3002\u4f46\u5982\u679c\u6ce8\u610f\u5230\u7684\u8bdd\uff0c\u5728controller-manager\u4e2d\u5e76\u6ca1\u6709\u9488\u5bf9Pod\u5bf9\u8c61\u64cd\u4f5c\u7684\u63a7\u5236\u5668\u3002\u5b9e\u9645\u4e0aK8S\u51b3\u5b9a\u628aPod\u653e\u5230\u54ea\u4e2a\u8282\u70b9\u4e0a\u662f\u7531\u7ec4\u4ef6scheduler\u6309\u7167\u76f8\u5e94\u7684\u7b56\u7565\u51b3\u7b56\u7684\uff0c\u800cPod\u7684\u5b9e\u9645\u521b\u5efa\u4e0e\u7ef4\u62a4\u662f\u7531kubelet\u5b8c\u6210\u7684\u3002\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u4e3ascheduler\u662fPod\u96c6\u7fa4\u5c42\u9762\u7684\u63a7\u5236\u5668\uff0ckubelet\u5219\u662fPod\u8282\u70b9\u5c42\u9762\u7684\u63a7\u5236\u5668\u3002\n\n\u5177\u4f53\u7684\u6765\u8bf4\uff0c\u5c31\u662fscheduler\u901a\u8fc7API server\u63d0\u4f9b\u7684Watch\u7b49\u63a5\u53e3\uff0c\u76d1\u542c\u5e76\u83b7\u53d6\u5230\u672a\u8c03\u5ea6\u7684Pod\u548c\u8282\u70b9\u7b49\u7684\u76f8\u5173\u4fe1\u606f\uff0c\u901a\u8fc7\u8fc7\u6ee4\u548c\u4f18\u5148\u7ea7\u7b97\u5206\u5bf9\u8282\u70b9\u7b5b\u9009\uff0c\u9009\u62e9\u51fa\u6700\u5408\u9002\u7684\u8282\u70b9\uff0c\u5c06Pod\u4e0e\u6b64\u8282\u70b9\u7ed1\u5b9a\uff0c\u5e76\u628a\u7ed3\u679c\u901a\u8fc7API server\u5b58\u50a8\u5230etcd\u4e2d\u3002\u5728\u76f8\u5e94\u5de5\u4f5c\u8282\u70b9\u4e0a\u7684kubelet\u4f1a\u53bb\u5b9e\u9645\u521b\u5efaPod\u7684SandBox\uff0c\u8c03\u7528CNI-Plugin\u8fdb\u884c\u76f8\u5e94\u7684\u7f51\u7edc\u914d\u7f6e\u6302\u63a5SandBox\u7f51\u7edc\u540d\u5b57\u7a7a\u95f4\u5230\u5bb9\u5668\u7f51\u7edc\u4e0a\uff0c\u521b\u5efa\u548c\u8fd0\u884cPod\u6240\u5c5e\u7684init\u5bb9\u5668\uff0c\u6700\u7ec8\u521b\u5efa\u548c\u8fd0\u884cPod\u7684\u5e38\u89c4\u4e1a\u52a1\u5bb9\u5668\u3002\n\n\n<h3 id=\"toc_4\">SDN\u5bb9\u5668\u7f51\u7edc<\/h3>\n\n\n\u4e1a\u754c\u6240\u8c13\u7684\u201cThere is no such thing called container 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id=\"toc_5\">\u6570\u636e\u8f6c\u53d1\u9762\u4e0e\u7ba1\u7406\u63a7\u5236\u9762<\/h4>\n\n\n\u9488\u5bf9\u5f53\u524d\u4e3b\u6d41\u7684\u5178\u578b\u7684\u5bb9\u5668\u7f51\u7edc\u89e3\u51b3\u65b9\u6848\u7684\u5206\u6790\uff0c\u7279\u522b\u4ece\u6570\u636e\u8f6c\u53d1\u9762\u7279\u5f81\u7684\u89d2\u5ea6\uff0c\u53ef\u4ee5\u8ba4\u4e3a\u4e3b\u8981\u5305\u62ec\u4ee5Calico\u4e3a\u4ee3\u8868\u7684\u57fa\u4e8e\u7ecf\u5178\u7684\u4e09\u5c42\u8def\u7531\u3001Netfilter\u6a21\u578b\u7684\u5b9e\u73b0\uff0c\u548c\u4ee5OpenShift\u7684SDN\u53caNeutron\u7b49\u4e3a\u5178\u578b\u4ee3\u8868\u7684\u4e8c\u5c42SDN\/OVS\u6a21\u578b\u7684\u5b9e\u73b0\u7b49\u3002\n\n<strong>\u4e09\u5c42\u8def\u7531\/Netfilter\u6a21\u578b<\/strong>\uff1a\u8fd9\u7c7b\u5b9e\u73b0\u7684\u4f18\u70b9\u662f\u7f51\u7edc\u62d3\u6251\u76f4\u89c2\u6613\u61c2\uff0c\u6241\u5e73\u5316\u7ed3\u6784\uff0c\u53ef\u6269\u5c55\u6027\u5f3a\uff1b\u5bb9\u5668\u95f4\u4e09\u5c42\u7f51\u7edc\u9694\u79bb\uff0c\u4e0d\u9700\u8981\u89e3\u51b3arp\u98ce\u66b4\u95ee\u9898\uff1b\u57fa\u4e8e\u7ecf\u5178\u7684\u3001\u6210\u719f\u7684Netfilter\/IPtables\u4e0eLinux\u8def\u7531\u6280\u672f\uff0c\u5305\u8f6c\u53d1\u4e0e\u7ec6\u7c92\u5ea6\u7b56\u7565\u63a7\u5236\u6548\u7387\u9ad8\u7b49\u3002\n\n<strong>\u4e8c\u5c42SDN\/OVS\u6a21\u578b<\/strong>\uff1a\u8fd9\u7c7b\u6a21\u5f0f\u7684\u8f6c\u53d1\u9762\u662f\u6307Overlay\u4e8c\u5c42\u548c\u6d41\u8868\u6d41\u6c34\u7ebf\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\u91c7\u7528OVS\uff0c\u652f\u6301\u4e0e\u5404\u79cdUnderlay\u6a21\u5f0f\u7684\u5bf9\u63a5\uff0c\u53ef\u6269\u5c55\u5b9e\u73b0DVR\u3001\u5e7f\u64ad\u6291\u5236\u7279\u6027\u7b49\u3002\u8fd9\u662f\u5f53\u524d\u6bd4\u8f83\u5178\u578b\u548c\u6210\u719f\u7684\u8f6c\u53d1\u9762SDN\u6a21\u5f0f\u65b9\u6848\uff1b\u4e09\u5c42\u91c7\u7528\u7f51\u7edc\u540d\u5b57\u7a7a\u95f4\u7684Linux\u8def\u7531\u5668\uff1b\u5b89\u5168\u7b56\u7565\u4ee5\u53caNAT\u529f\u80fd\u91c7\u7528Netfilter\/IPtables\u5b9e\u73b0\u3002\n\n\u57fa\u4e8e\u8fd9\u79cd\u53c2\u8003\u67b6\u6784\u5b9e\u73b0\u7684\u65b9\u6848\u7684\u4f18\u70b9\u662f\u517c\u5bb9\u4e86\u4f20\u7edf\u7f51\u7edc\u4e8c\u5c42\u4ea4\u6362\u3001\u4e09\u5c42\u8def\u7531\u3001\u7b56\u7565\u63a7\u5236\uff0c\u53ef\u4ee5\u901a\u8fc7VLAN\u5b9e\u73b0\u591a\u79df\u6237\u9694\u79bb\uff1b\u53ef\u4ee5\u91c7\u7528\u5178\u578b\u7684SDN\u5957\u8def\u5bf9\u5bb9\u5668\u7f51\u7edc\u7684\u8bbf\u95ee\u505a\u5230\u7ec6\u7c92\u5ea6\u63a7\u5236\uff1bOverlay\u4e0eUnderlay\u7684\u89e3\u8026\u8bbe\u8ba1\uff0c\u5177\u5907\u826f\u597d\u7684\u6df7\u5408\u4e91\u3001\u516c\u6709\u4e91\u7684\u4e92\u8054\u80fd\u529b\uff1b\u903b\u8f91\u7ed3\u6784\u6e05\u6670\uff0c\u53ef\u9002\u5e94\u4e0d\u540c\u573a\u666f\u548c\u89c4\u6a21\u7684\u7f51\u7edc\u65b9\u6848\uff1b\u6709\u6210\u719f\u7684\u5f00\u53d1\u90e8\u7f72\u8fd0\u7ef4\u5b9e\u8df5\u7ecf\u9a8c\uff0c\u7a33\u5b9a\u6027\u7ecf\u8fc7\u751f\u4ea7\u73af\u5883\u9a8c\u8bc1\u3002\u8fd9\u79cd\u7c7b\u578b\u7684\u5178\u578b\u6709OpenShitf\u7684SDN\u8f6c\u53d1\u9762\u65b9\u6848\uff0c\u4ece\u67d0\u79cd\u89d2\u5ea6\u6765\u770b\u5b83\u4e0eNeutron\u6a21\u578b\u7684\u8f6c\u53d1\u9762\u5b9e\u73b0\u6709\u5f88\u591a\u7c7b\u4f3c\u7684\u5730\u65b9\u3002\n\nSDN\u5bb9\u5668\u7f51\u7edc\u8f6c\u53d1\u9762\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\u7684\u5173\u952e\u56e0\u7d20\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u865a\u62df\u7f51\u7edc\u65b9\u6848\u800c\u8a00\uff0c\u662f\u9009\u62e9\u4ee5Linux\u8def\u7531\u3001Netfilter\u4e3a\u57fa\u7840\uff0c\u53e0\u52a0\u57fa\u4e8eOVS\u7684\u591a\u79df\u6237\u652f\u6301\u7b49\u7684SDN\u6269\u5c55\u3002\u4e00\u822c\u800c\u8a00\u4ee5OVS\u4e3a\u4e3b\u4f53\u7684SDN\u5bb9\u5668\u7f51\u7edc\u89e3\u51b3\u65b9\u6848\uff0c\u4e5f\u662f\u9700\u8981\u6709\u4e09\u5c42\u4e92\u8054\u7684\u529f\u80fd\u914d\u5408\u7684\u3002\u800c\u5bf9\u4e8e\u7b80\u5355\u6241\u5e73\u7684\u4e09\u5c42\u5bb9\u5668\u7f51\u7edc\u65b9\u6848\u662f\u53ef\u4ee5\u6ca1\u6709\u4e8c\u5c42OVS\u7279\u6027\u652f\u6301\u7684\u3002\n\n\n<p 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