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loading=\"lazy\"><\/p>\n<p>\u57fa\u4e8e\u73b0\u6709\u4e13\u7ebf\u4ea7\u54c1BGW\u7684\u529f\u80fd\u9650\u5236\uff0c\u4e91\u4e0a\u4e00\u4fa7\u7684\u8def\u7531\u53ea\u80fd\u6307\u5411K8S\u96c6\u7fa4\u6240\u5728\u7684VPC\uff0c\u65e0\u6cd5\u6307\u5411\u5177\u4f53\u7684\u67d0\u4e2aK8S\u8282\u70b9\u3002\u800c\u60f3\u8981\u8bbf\u95eeclusterIP\u7c7b\u578bservice\u548cpod\uff0c\u5fc5\u987b\u5728\u96c6\u7fa4\u5185\u7684\u8282\u70b9\u548cpod\u8bbf\u95ee\u3002\u56e0\u6b64\u8bbf\u95eeservice\u548cpod\u7684\u8def\u7531\u4e0b\u4e00\u8df3\uff0c\u5fc5\u987b\u662f\u67d0\u4e2a\u96c6\u7fa4\u8282\u70b9\u3002\u6240\u4ee5\u4f7f\u7528\u4e13\u7ebf\u4ea7\u54c1\u663e\u7136\u662f\u65e0\u6cd5\u6ee1\u8db3\u9700\u6c42\u7684\u3002<\/p>\n<p>\u6211\u4eec\u6765\u770b\u81ea\u5efaVPN\u65b9\u5f0f\uff0c\u81ea\u5efaVPN\u5728\u5ba2\u6237\u529e\u516c\u7f51\u548c\u4e91\u4e0a\u7f51\u7edc\u5404\u6709\u4e00\u4e2a\u6709\u516c\u7f51IP\u7684\u7aef\u70b9\u8bbe\u5907\uff0c\u4e24\u4e2a\u8bbe\u5907\u4e4b\u95f4\u5efa\u7acb\u52a0\u5bc6\u901a\u8baf\u96a7\u9053\uff0c\u5b9e\u9645\u5e95\u5c42\u8fd8\u662f\u57fa\u4e8e\u516c\u7f51\u901a\u8baf\u3002\u5982\u679c\u4f7f\u7528\u8be5\u65b9\u6848\uff0c\u4e91\u4e0a\u7684\u7aef\u70b9\u6211\u4eec\u53ef\u4ee5\u9009\u62e9\u548c\u96c6\u7fa4\u8282\u70b9\u5728\u540c\u4e00VPC\u7684\u4e0d\u540c\u5b50\u7f51\u4e0b\u7684\u6709\u516c\u7f51IP\u7684\u4e91\u4e3b\u673a\u3002\u529e\u516c\u7f51\u4fa7\u5bf9service\u548cpod\u7684\u8bbf\u95ee\u6570\u636e\u5305\u901a\u8fc7VPN\u96a7\u9053\u53d1\u9001\u81f3\u4e91\u4e3b\u673a\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e\u4e91\u4e3b\u673a\u6240\u5728\u5b50\u7f51\u8def\u7531\uff0c\u5c06\u6570\u636e\u5305\u8def\u7531\u81f3\u67d0\u4e2a\u96c6\u7fa4\u8282\u70b9\uff0c\u7136\u540e\u5728\u96c6\u7fa4\u8282\u70b9\u6240\u5728\u5b50\u7f51\u914d\u7f6e\u5230\u5ba2\u6237\u7aef\u7684\u8def\u7531\u4e0b\u4e00\u8df3\u6307\u5411\u7aef\u70b9\u4e91\u4e3b\u673a\uff0c\u540c\u65f6\u9700\u8981\u5728pod\u5b50\u7f51\u4e5f\u505a\u76f8\u540c\u7684\u8def\u7531\u914d\u7f6e\u3002\u81f3\u4e8eVPN\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u901a\u8fc7\u548c\u5ba2\u6237\u6c9f\u901a\uff0c\u6211\u4eec\u9009\u53d6ipsec\u96a7\u9053\u65b9\u5f0f\u3002<\/p>\n<p>\u786e\u5b9a\u4e86\u65b9\u6848\uff0c\u6211\u4eec\u9700\u8981\u5728\u6d4b\u8bd5\u73af\u5883\u5b9e\u65bd\u65b9\u6848\u9a8c\u8bc1\u53ef\u884c\u6027\u3002\u7531\u4e8e\u6211\u4eec\u6ca1\u6709\u4e91\u4e0b\u73af\u5883\uff0c\u56e0\u6b64\u9009\u53d6\u548cK8S\u96c6\u7fa4\u4e0d\u540c\u5730\u57df\u7684\u4e91\u4e3b\u673a\u4ee3\u66ff\u5ba2\u6237\u7684\u529e\u516c\u7f51\u7aef\u70b9\u8bbe\u5907\u3002\u5728\u534e\u4e1c\u4e0a\u6d77\u5730\u57df\u521b\u5efa\u4e91\u4e3b\u673aoffice-ipsec-sh\u6a21\u62df\u5ba2\u6237\u529e\u516c\u7f51\u5ba2\u6237\u7aef\uff0c\u5728\u534e\u5317\u5317\u4eac\u5730\u57df\u7684K8S\u96c6\u7fa4K8S-BJTEST01\u6240\u5728VPC\u7684NAT\/LB\u5b50\u7f51\u521b\u5efa\u4e00\u4e2a\u6709\u516c\u7f51IP\u7684\u4e91\u4e3b\u673aK8S-ipsec-bj\uff0c\u6a21\u62df\u5ba2\u6237\u573a\u666f\u4e0b\u7684ipsec\u4e91\u4e0a\u7aef\u70b9\uff0c\u4e0e\u534e\u4e1c\u4e0a\u6d77\u4e91\u4e3b\u673aoffice-ipsec-sh\u5efa\u7acbipsec\u96a7\u9053\u3002\u8bbe\u7f6eNAT\/LB\u5b50\u7f51\u7684\u8def\u7531\u8868\uff0c\u6dfb\u52a0\u5230service\u7f51\u6bb5\u7684\u8def\u7531\u4e0b\u4e00\u8df3\u6307\u5411K8S\u96c6\u7fa4\u8282\u70b9k8s-node-vmlppp-bs9jq8pua\uff0c\u4ee5\u4e0b\u7b80\u79f0node A\u3002\u7531\u4e8epod\u5b50\u7f51\u548cNAT\/LB\u5b50\u7f51\u540c\u5c5e\u4e8e\u4e00\u4e2aVPC\uff0c\u6240\u4ee5\u65e0\u9700\u914d\u7f6e\u5230pod\u7f51\u6bb5\u7684\u8def\u7531\uff0c\u8bbf\u95eepod\u65f6\u4f1a\u76f4\u63a5\u5339\u914dlocal\u8def\u7531\uff0c\u8f6c\u53d1\u81f3\u5bf9\u5e94\u7684\u5f39\u6027\u7f51\u5361\u4e0a\u3002\u4e3a\u4e86\u5b9e\u73b0\u6570\u636e\u5305\u7684\u8fd4\u56de\uff0c\u5728node\u5b50\u7f51\u548cpod\u5b50\u7f51\u5206\u522b\u914d\u7f6e\u5230\u4e0a\u6d77\u4e91\u4e3b\u673aoffice-ipsec-sh\u7684\u8def\u7531\uff0c\u4e0b\u4e00\u8df3\u6307\u5411K8S-ipsec-bj\u3002\u5b8c\u6574\u67b6\u6784\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355393\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><strong>\u7b2c\u4e09\u90e8\u5206\uff1a\u5b9e\u8df5\u51fa\u201c\u95ee\u9898\u201d<\/strong><\/p>\n<p>\u65e2\u7136\u786e\u5b9a\u4e86\u65b9\u6848\uff0c\u6211\u4eec\u5c31\u5f00\u59cb\u642d\u5efa\u73af\u5883\u4e86\u3002\u9996\u5148\u5728K8S\u96c6\u7fa4\u7684NAT\/LB\u5b50\u7f51\u521b\u5efak8s-ipsec-bj\u4e91\u4e3b\u673a\uff0c\u5e76\u7ed1\u5b9a\u516c\u7f51IP\u3002\u7136\u540e\u4e0e\u4e0a\u6d77\u4e91\u4e3b\u673aoffice-ipsec-sh\u5efa\u7acbipsec\u96a7\u9053\u3002\u5173\u4e8eipsec\u90e8\u5206\u7684\u914d\u7f6e\u65b9\u6cd5\u7f51\u7edc\u4e0a\u6709\u5f88\u591a\u6587\u6863\uff0c\u5728\u6b64\u4e0d\u505a\u8be6\u7ec6\u53d9\u8ff0\uff0c\u6709\u5174\u8da3\u7684\u7ae5\u978b\u53ef\u4ee5\u53c2\u7167\u6587\u6863\u81ea\u5df1\u5b9e\u8df5\u4e0b\u3002\u96a7\u9053\u5efa\u7acb\u540e\uff0c\u5728\u4e24\u7aef\u4e92ping\u5bf9\u7aef\u7684\u5185\u7f51IP\uff0c\u5982\u679c\u53ef\u4ee5ping\u901a\u7684\u8bdd\uff0c\u8bc1\u660eipsec\u5de5\u4f5c\u6b63\u5e38\u3002\u6309\u7167\u89c4\u5212\u914d\u7f6e\u597dNAT\/LB\u5b50\u7f51\u548cnode\u5b50\u7f51\u4ee5\u53capod\u5b50\u7f51\u7684\u8def\u7531\u3002\u6211\u4eec\u5728k8s\u96c6\u7fa4\u7684serivce\u4e2d\uff0c\u9009\u62e9\u4e00\u4e2a\u540d\u4e3anginx\u7684serivce\uff0cclusterIP\u4e3a10.0.58.158\uff0c\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355394\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u8be5\u670d\u52a1\u540e\u7aef\u7684pod\u662f10.0.0.13\uff0c\u90e8\u7f72nginx\u9ed8\u8ba4\u9875\u9762\uff0c\u5e76\u76d1\u542c80\u7aef\u53e3\u3002\u5728\u4e0a\u6d77\u4e91\u4e3b\u673a\u4e0a\u6d4b\u8bd5ping service\u7684IP 10.0.58.158\uff0c\u53ef\u4ee5ping\u901a\uff0c\u540c\u65f6\u4f7f\u7528paping\u5de5\u5177ping\u670d\u52a1\u768480\u7aef\u53e3\uff0c\u4e5f\u53ef\u4ee5ping\u901a\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355395\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u4f7f\u7528curl <a href=\"https:\/\/link.segmentfault.com\/?enc=6%2Bv0vSjexKV48wgPvG7mug%3D%3D.x5ljxK1QpAgD%2FUQTUKuPctRsgY76P%2FevKAQlNt1RnOc%3D\" rel=\"nofollow\">http:\/\/10.0.58.158<\/a>\u8fdb\u884chttp\u8bf7\u6c42\uff0c\u4e5f\u53ef\u4ee5\u6210\u529f\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355396\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u518d\u6d4b\u8bd5\u76f4\u63a5\u8bbf\u95ee\u540e\u7aefpod\uff0c\u4e5f\u6ca1\u6709\u95ee\u9898:)<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355397\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355398\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u6b63\u5f53\u653b\u57ce\u72ee\u5fc3\u91cc\u7f8e\u6ecb\u6ecb\uff0c\u4ee5\u4e3a\u4e00\u5207\u90fd\u5927\u529f\u544a\u6210\u7684\u65f6\u5019\uff0c\u6d4b\u8bd5\u8bbf\u95ee\u53e6\u4e00\u4e2aservice\u7684\u7ed3\u679c\u72b9\u5982\u4e00\u76c6\u51b7\u6c34\u6cfc\u6765\u3002\u6211\u4eec\u63a5\u7740\u9009\u53d6\u4e86mysql\u8fd9\u4e2aservice\uff0c\u6d4b\u8bd5\u8bbf\u95ee3306\u7aef\u53e3\u3002\u8be5serivce\u7684clusterIP\u662f10.0.60.80\uff0c\u540e\u7aefpod\u7684IP\u662f10.0.0.14<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355399\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5728\u4e0a\u6d77\u4e91\u4e3b\u673a\u76f4\u63a5ping service\u7684clusterIP\uff0c\u6ca1\u6709\u95ee\u9898\u3002\u4f46\u662fpaping 3306\u7aef\u53e3\u7684\u65f6\u5019\uff0c\u5c45\u7136\u4e0d\u901a\u4e86\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355400\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u7136\u540e\u6211\u4eec\u6d4b\u8bd5\u76f4\u63a5\u8bbf\u95eeserivce\u7684\u540e\u7aefpod\uff0c\u8be1\u5f02\u7684\u662f\uff0c\u540e\u7aefpod\u65e0\u8bba\u662fping IP\u8fd8\u662fpaping 3306\u7aef\u53e3\uff0c\u90fd\u662f\u53ef\u4ee5\u8fde\u901a\u7684\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355401\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u80bf\u4e48\u56de\u4e8b\uff1f\u8fd9\u662f\u80bf\u4e48\u56de\u4e8b\uff1f<\/p>\n<p>\u7ecf\u8fc7\u653b\u57ce\u72ee\u4e00\u756a\u5bf9\u6bd4\u5206\u6790\uff0c\u53d1\u73b0\u4e24\u4e2aserivce\u552f\u4e00\u7684\u4e0d\u540c\u662f\uff0c\u53ef\u4ee5\u8fde\u901anginx\u670d\u52a1\u7684\u540e\u7aefpod 10.0.0.13\u5c31\u90e8\u7f72\u5728\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u5230\u7684node A\u4e0a\u3002\u800c\u4e0d\u80fd\u8fde\u901a\u7684mysql\u670d\u52a1\u7684\u540e\u7aefpod\u4e0d\u5728node A\u4e0a\uff0c\u5728\u53e6\u4e00\u4e2a\u8282\u70b9\u4e0a\u3002<\/p>\n<p>\u4e3a\u4e86\u9a8c\u8bc1\u95ee\u9898\u539f\u56e0\u662f\u5426\u5c31\u5728\u4e8e\u6b64\uff0c\u6211\u4eec\u5355\u72ec\u4fee\u6539NAT\/LB\u5b50\u7f51\u8def\u7531\uff0c\u5230mysql\u670d\u52a1\u7684\u4e0b\u4e00\u8df3\u6307\u5411\u540e\u7aefpod\u6240\u5728\u7684\u8282\u70b9\u3002\u7136\u540e\u518d\u6b21\u6d4b\u8bd5\u3002\u679c\u7136\uff01\u73b0\u5728\u53ef\u4ee5\u8bbf\u95eemysql\u670d\u52a1\u76843306\u7aef\u53e3\u4e86\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355402\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>**\u63a2\u7a76\u539f\u56e0<br \/>\u7b2c\u56db\u90e8\u5206\uff1a\u4e09\u4e2a\u4e3a\u4ec0\u4e48\uff1f**<\/p>\n<p>\u6b64\u65f6\u6b64\u523b\uff0c\u653b\u57ce\u72ee\u7684\u5fc3\u4e2d\u6709\u4e09\u4e2a\u7591\u95ee\uff1a<br \/>\uff081\uff09\u4e3a\u4ec0\u4e48\u8bf7\u6c42\u8f6c\u53d1\u81f3service\u540e\u7aefpod\u6240\u5728\u7684\u8282\u70b9\u65f6\u53ef\u4ee5\u8fde\u901a\uff1f<br \/>\uff082\uff09\u4e3a\u4ec0\u4e48\u8bf7\u6c42\u8f6c\u53d1\u81f3service\u540e\u7aefpod\u4e0d\u5728\u7684\u8282\u70b9\u65f6\u4e0d\u80fd\u8fde\u901a\uff1f<br \/>\uff083\uff09\u4e3a\u4ec0\u4e48\u4e0d\u7ba1\u8f6c\u53d1\u81f3\u54ea\u4e2a\u8282\u70b9\uff0cservice\u7684IP\u90fd\u53ef\u4ee5ping\u901a\uff1f<\/p>\n<ul>\n<li>\u6df1\u5165\u5206\u6790\uff0c\u6d88\u9664\u95ee\u53f7<br \/>\u4e3a\u4e86\u6d88\u9664\u6211\u4eec\u5fc3\u4e2d\u7684\u5c0f\u95ee\u53f7\uff0c\u6211\u4eec\u5c31\u8981\u6df1\u5165\u5206\u6790\uff0c\u4e86\u89e3\u5bfc\u81f4\u95ee\u9898\u7684\u539f\u56e0\uff0c\u7136\u540e\u518d\u5bf9\u75c7\u4e0b\u836f\u3002\u65e2\u7136\u8981\u6392\u67e5\u7f51\u7edc\u95ee\u9898\uff0c\u5f53\u7136\u8fd8\u662f\u8981\u796d\u51fa\u7ecf\u5178\u6cd5\u5b9d\u2014\u2014tcpdump\u6293\u5305\u5de5\u5177\u3002\u4e3a\u4e86\u628a\u7126\u70b9\u96c6\u4e2d\uff0c\u6211\u4eec\u5bf9\u6d4b\u8bd5\u73af\u5883\u7684\u67b6\u6784\u8fdb\u884c\u4e86\u8c03\u6574\u3002\u4e0a\u6d77\u5230\u5317\u4eac\u7684ipsec\u90e8\u5206\u7ef4\u6301\u73b0\u6709\u67b6\u6784\u4e0d\u53d8\uff0c\u6211\u4eec\u5bf9K8S\u96c6\u7fa4\u8282\u70b9\u8fdb\u884c\u6269\u5bb9\uff0c\u65b0\u5efa\u4e00\u4e2a\u6ca1\u6709\u4efb\u4f55pod\u7684\u7a7a\u8282\u70b9k8s-node-vmcrm9-bst9jq8pua\uff0c\u4ee5\u4e0b\u7b80\u79f0node B\uff0c\u8be5\u8282\u70b9\u53ea\u505a\u8bf7\u6c42\u8f6c\u53d1\u3002\u4fee\u6539NAT\/LB\u5b50\u7f51\u8def\u7531\uff0c\u8bbf\u95eeservice\u5730\u5740\u7684\u8def\u7531\u4e0b\u4e00\u8df3\u6307\u5411\u8be5\u8282\u70b9\u3002\u6d4b\u8bd5\u7684service\u6211\u4eec\u9009\u53d6\u4e4b\u524d\u4f7f\u7528\u7684nginx\u670d\u52a110.0.58.158\u548c\u540e\u7aefpod 10.0.0.13\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/li>\n<\/ul>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355403\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5f53\u9700\u8981\u6d4b\u8bd5\u8bf7\u6c42\u8f6c\u53d1\u81f3pod\u6240\u5728\u8282\u70b9\u7684\u573a\u666f\u65f6\uff0c\u6211\u4eec\u5c06service\u8def\u7531\u4e0b\u4e00\u8df3\u4fee\u6539\u4e3ak8s-node-A\u5373\u53ef\u3002<\/p>\n<p><strong>\u4e07\u4e8b\u4ff1\u5907\uff0c\u8ba9\u6211\u4eec\u5f00\u542f\u89e3\u60d1\u4e4b\u65c5\uff01Go Go Go!<\/strong><\/p>\n<p>\u9996\u5148\u63a2\u7a76\u7591\u95ee1\u573a\u666f\uff0c\u6211\u4eec\u5728k8s-node-A\u4e0a\u6267\u884c\u547d\u4ee4\u6293\u53d6\u4e0e\u4e0a\u6d77\u4e91\u4e3b\u673a172.16.0.50\u7684\u5305\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<br \/>tcpdump -i any host 172.16.0.50 -w \/tmp\/dst-node-client.cap<\/p>\n<p>\u5404\u4f4d\u7ae5\u978b\u662f\u5426\u8fd8\u8bb0\u5f97\u6211\u4eec\u4e4b\u524d\u63d0\u5230\u8fc7\uff0c\u5728\u6258\u7ba1K8S\u96c6\u7fa4\u4e2d\uff0c\u6240\u6709pod\u7684\u6570\u636e\u6d41\u91cf\u5747\u901a\u8fc7\u8282\u70b9\u7684\u5f39\u6027\u7f51\u5361\u6536\u53d1\uff1f<\/p>\n<p>\u5728k8s-node-A\u4e0apod\u4f7f\u7528\u7684\u5f39\u6027\u7f51\u5361\u662feth1\u3002\u6211\u4eec\u9996\u5148\u5728\u4e0a\u6d77\u4e91\u4e3b\u673a\u4e0a\u4f7f\u7528curl\u547d\u4ee4\u8bf7\u6c42<a href=\"https:\/\/link.segmentfault.com\/?enc=j%2BEWMI0CNFlwGtiBcJUzCQ%3D%3D.X6xYvrLUSdX%2BGB2RQASvGlFwjV8nVAT2cZU%2FvO6mRAA%3D\" rel=\"nofollow\">http:\/\/10.0.58.158<\/a>\uff0c\u540c\u65f6\u6267\u884c\u547d\u4ee4\u6293\u53d6k8s-node-A\u7684eth1\u4e0a\u662f\u5426\u6709pod 10.0.0.13\u7684\u5305\u6536\u53d1\uff0c\u547d\u4ee4\u5982\u4e0b\uff1atcpdump \u2013i eth1 host 10.0.0.13\u7ed3\u679c\u5982\u4e0b\u56fe:<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355404\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5e76\u6ca1\u6709\u4efb\u4f5510.0.0.13\u7684\u5305\u4eceeth1\u6536\u53d1\uff0c\u4f46\u6b64\u65f6\u4e0a\u6d77\u4e91\u4e3b\u673a\u4e0a\u7684curl\u64cd\u4f5c\u662f\u53ef\u4ee5\u8bf7\u6c42\u6210\u529f\u7684\uff0c\u8bf4\u660e10.0.0.13\u5fc5\u7136\u7ed9\u5ba2\u6237\u7aef\u56de\u5305\u4e86\uff0c\u4f46\u662f\u5e76\u6ca1\u6709\u901a\u8fc7eth1\u56de\u5305\u3002<br \/>\u90a3\u4e48\u6211\u4eec\u5c06\u6293\u5305\u8303\u56f4\u6269\u5927\u81f3\u5168\u90e8\u63a5\u53e3\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<br \/>tcpdump -i any host 10.0.0.13<br \/>\u7ed3\u679c\u5982\u4e0b\u56fe:<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355405\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\u8fd9\u6b21\u786e\u5b9e\u6293\u5230\u4e8610.0.0.13\u548c172.16.0.50\u4ea4\u4e92\u7684\u6570\u636e\u5305\uff0c\u4e3a\u4e86\u4fbf\u4e8e\u5206\u6790\uff0c\u6211\u4eec\u4f7f\u7528\u547d\u4ee4tcpdump -i any host 10.0.0.13 -w \/tmp\/dst-node-pod.cap\u5c06\u5305\u8f93\u51fa\u4e3acap\u6587\u4ef6\u3002<\/p>\n<p>\u540c\u65f6\u6211\u4eec\u518d\u6267\u884ctcpdump -i any host 10.0.58.158\uff0c\u5bf9service IP\u8fdb\u884c\u6293\u5305\uff0c<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355406\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u53ef\u4ee5\u770b\u5230172.16.0.50\u6267\u884ccurl\u8bf7\u6c42\u65f6\u53ef\u4ee5\u6293\u5230\u6570\u636e\u5305\uff0c\u4e14\u53ea\u670910.0.58.158\u4e0e172.16.0.50\u4ea4\u4e92\u7684\u6570\u636e\u5305\uff0c\u4e0d\u6267\u884c\u8bf7\u6c42\u65f6\u6ca1\u6709\u6570\u636e\u5305\u3002<br \/>\u7531\u4e8e\u8fd9\u4e00\u90e8\u5206\u6570\u636e\u5305\u4f1a\u5305\u542b\u5728\u5bf9172.16.0.50\u7684\u6293\u5305\u4e2d\uff0c\u56e0\u6b64\u6211\u4eec\u4e0d\u518d\u5355\u72ec\u5206\u6790\u3002<br \/>\u5c06\u9488\u5bf9172.16.0.50\u548c10.0.0.13\u7684\u6293\u5305\u6587\u4ef6\u53d6\u51fa\uff0c\u4f7f\u7528wireshark\u5de5\u5177\u8fdb\u884c\u5206\u6790,\u9996\u5148\u5206\u6790\u5bf9\u5ba2\u6237\u7aef172.16.0.50\u7684\u6293\u5305\uff0c\u8be6\u60c5\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355407\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u53ef\u4ee5\u53d1\u73b0\u5ba2\u6237\u7aef172.16.0.50\u5148\u7ed9service IP 10.0.58.158\u53d1\u4e86\u4e00\u4e2a\u5305\uff0c\u7136\u540e\u53c8\u7ed9pod IP 10.0.0.13\u53d1\u4e86\u4e00\u4e2a\u5305\uff0c\u4e24\u4e2a\u5305\u7684ID\uff0c\u5185\u5bb9\u7b49\u5b8c\u5168\u4e00\u81f4\u3002\u800c\u6700\u540e\u56de\u5305\u65f6\uff0cpod 10.0.0.13\u7ed9\u5ba2\u6237\u7aef\u56de\u4e86\u4e00\u4e2a\u5305\uff0c\u7136\u540eservice IP 10.0.58.158\u4e5f\u7ed9\u5ba2\u6237\u7aef\u56de\u4e86\u4e00\u4e2aID\u548c\u5185\u5bb9\u5b8c\u5168\u76f8\u540c\u7684\u5305\u3002\u8fd9\u662f\u4ec0\u4e48\u539f\u56e0\u5bfc\u81f4\u7684\u5462\uff1f<\/p>\n<p>\u901a\u8fc7\u4e4b\u524d\u7684\u4ecb\u7ecd\uff0c\u6211\u4eec\u77e5\u9053service\u5c06\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u81f3\u540e\u7aefpod\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u5ba2\u6237\u7aef\u8bf7\u6c42\u7684\u662fservice\u7684IP\uff0c\u7136\u540eservice\u4f1a\u505aDNAT\uff08\u6839\u636e\u76ee\u7684IP\u505aNAT\u8f6c\u53d1\uff09\uff0c\u5c06\u8bf7\u6c42\u8f6c\u53d1\u81f3\u540e\u7aef\u7684pod IP\u3002\u867d\u7136\u6211\u4eec\u6293\u5305\u770b\u5230\u7684\u662f\u5ba2\u6237\u7aef\u53d1\u4e86\u4e24\u6b21\u5305\uff0c\u5206\u522b\u53d1\u7ed9service\u548cpod\uff0c\u5b9e\u9645\u4e0a\u5ba2\u6237\u7aef\u5e76\u6ca1\u6709\u91cd\u65b0\u53d1\u5305\uff0c\u800c\u662f\u7531service\u5b8c\u6210\u4e86\u76ee\u7684\u5730\u5740\u8f6c\u6362\u3002\u800cpod\u56de\u5305\u65f6\uff0c\u4e5f\u662f\u5c06\u5305\u56de\u7ed9service\uff0c\u7136\u540e\u518d\u7531service\u8f6c\u53d1\u7ed9\u5ba2\u6237\u7aef\u3002\u56e0\u4e3a\u662f\u76f8\u540c\u8282\u70b9\u5185\u8bf7\u6c42\uff0c\u8fd9\u4e00\u8fc7\u7a0b\u5e94\u8be5\u662f\u5728\u8282\u70b9\u7684\u5185\u90e8\u865a\u62df\u7f51\u7edc\u4e2d\u5b8c\u6210\uff0c\u6240\u4ee5\u6211\u4eec\u5728pod\u4f7f\u7528\u7684eth1\u7f51\u5361\u4e0a\u5e76\u6ca1\u6709\u6293\u5230\u548c\u5ba2\u6237\u7aef\u4ea4\u4e92\u7684\u4efb\u4f55\u6570\u636e\u5305\u3002\u518d\u7ed3\u5408pod\u7ef4\u5ea6\u7684\u6293\u5305\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u9488\u5bf9client\u6293\u5305\u65f6\u6293\u5230\u7684http get\u8bf7\u6c42\u5305\u5728\u5bf9pod\u7684\u6293\u5305\u4e2d\u4e5f\u80fd\u6293\u5230\uff0c\u4e5f\u9a8c\u8bc1\u4e86\u6211\u4eec\u7684\u5206\u6790\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355408\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355409\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u90a3\u4e48pod\u662f\u901a\u8fc7\u54ea\u4e2a\u7f51\u7edc\u63a5\u53e3\u8fdb\u884c\u6536\u53d1\u5305\u7684\u5462\uff1f\u6267\u884c\u547d\u4ee4netstat -rn\u67e5\u770bnode A\u4e0a\u7684\u7f51\u7edc\u8def\u7531\uff0c\u6211\u4eec\u6709\u4e86\u5982\u4e0b\u53d1\u73b0\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355410\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5728\u8282\u70b9\u5185\uff0c\u6240\u6709\u8bbf\u95ee10.0.0.13\u7684\u8def\u7531\u90fd\u6307\u5411\u4e86cni34f0b149874\u8fd9\u4e2a\u7f51\u7edc\u63a5\u53e3\u3002\u5f88\u663e\u7136\u8fd9\u4e2a\u63a5\u53e3\u662fCNI\u7f51\u7edc\u63d2\u4ef6\u521b\u5efa\u7684\u865a\u62df\u7f51\u7edc\u8bbe\u5907\u3002\u4e3a\u4e86\u9a8c\u8bc1pod\u6240\u6709\u7684\u6d41\u91cf\u662f\u5426\u90fd\u901a\u8fc7\u8be5\u63a5\u53e3\u6536\u53d1\uff0c\u6211\u4eec\u518d\u6b21\u5728\u5ba2\u6237\u7aef\u8bf7\u6c42service\u5730\u5740\uff0c\u5728node A\u4ee5\u5ba2\u6237\u7aef\u7ef4\u5ea6\u548cpod\u7ef4\u5ea6\u6293\u5305\uff0c\u4f46\u662f\u8fd9\u6b21\u4ee5pod\u7ef4\u5ea6\u6293\u5305\u65f6\uff0c\u6211\u4eec\u4e0d\u518d\u4f7f\u7528-i any\u53c2\u6570\uff0c\u800c\u662f\u66ff\u6362\u4e3a-i cni34f0b149874\u3002\u6293\u5305\u540e\u5206\u6790\u5bf9\u6bd4\uff0c\u53d1\u73b0\u5982\u6211\u4eec\u6240\u6599\uff0c\u5ba2\u6237\u7aef\u5bf9pod\u7684\u6240\u6709\u8bf7\u6c42\u5305\u90fd\u80fd\u5728\u5bf9cni34f0b149874\u7684\u6293\u5305\u4e2d\u627e\u5230\uff0c\u540c\u65f6\u5bf9\u7cfb\u7edf\u4e2d\u9664\u4e86cni34f0b149874\u4e4b\u5916\u7684\u5176\u4ed6\u7f51\u7edc\u63a5\u53e3\u6293\u5305\uff0c\u5747\u6ca1\u6709\u6293\u5230\u4e0e\u5ba2\u6237\u7aef\u4ea4\u4e92\u7684\u4efb\u4f55\u6570\u636e\u5305\u3002\u56e0\u6b64\u53ef\u4ee5\u8bc1\u660e\u6211\u4eec\u7684\u63a8\u65ad\u6b63\u786e\u3002<\/p>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0c\u5728\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u81f3pod\u6240\u5728\u8282\u70b9\u65f6\uff0c\u6570\u636e\u901a\u8def\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355411\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u63a2\u7a76\u6700\u4e3a\u5173\u5fc3\u7684\u95ee\u98982\u573a\u666f\uff0c\u4fee\u6539NAT\/LB\u5b50\u7f51\u8def\u7531\u5230service\u7684\u4e0b\u4e00\u8df3\u6307\u5411\u65b0\u5efa\u8282\u70b9node B\uff0c\u5982\u56fe\u6240\u793a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355412\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u8fd9\u6b21\u6211\u4eec\u9700\u8981\u5728node B\u548cnode A\u4e0a\u540c\u65f6\u6293\u5305\u3002\u5728\u5ba2\u6237\u7aef\u8fd8\u662f\u4f7f\u7528curl\u65b9\u5f0f\u8bf7\u6c42service\u5730\u5740\u3002\u5728\u8f6c\u53d1\u8282\u70b9node B\u4e0a\uff0c\u6211\u4eec\u5148\u6267\u884c\u547d\u4ee4tcpdump -i eth0 host 10.0.58.158\u6293\u53d6service\u7ef4\u5ea6\u7684\u6570\u636e\u5305\uff0c\u53d1\u73b0\u6293\u53d6\u5230\u4e86\u5ba2\u6237\u7aef\u5230service\u7684\u8bf7\u6c42\u5305\uff0c\u4f46\u662fservice\u6ca1\u6709\u4efb\u4f55\u56de\u5305\uff0c\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355413\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5404\u4f4d\u7ae5\u978b\u53ef\u80fd\u4f1a\u6709\u7591\u60d1\uff0c\u4e3a\u4ec0\u4e48\u6293\u53d6\u7684\u662f10.0.58.158\uff0c\u4f46\u6293\u5305\u4e2d\u663e\u793a\u7684\u76ee\u7684\u7aef\u662f\u8be5\u8282\u70b9\u540d\uff1f<\/p>\n<p>\u5b9e\u9645\u4e0a\u8fd9\u4e0eservice\u7684\u5b9e\u73b0\u673a\u5236\u6709\u5173\u3002\u5728\u96c6\u7fa4\u4e2d\u521b\u5efaservice\u540e\uff0c\u96c6\u7fa4\u7f51\u7edc\u7ec4\u4ef6\u4f1a\u5728\u5404\u4e2a\u8282\u70b9\u4e0a\u90fd\u9009\u53d6\u4e00\u4e2a\u968f\u673a\u7aef\u53e3\u8fdb\u884c\u76d1\u542c\uff0c\u7136\u540e\u5728\u8282\u70b9\u7684iptables\u4e2d\u914d\u7f6e\u8f6c\u53d1\u89c4\u5219\uff0c\u51e1\u662f\u5728\u8282\u70b9\u5185\u8bf7\u6c42service IP\u5747\u8f6c\u53d1\u81f3\u8be5\u968f\u673a\u7aef\u53e3\uff0c\u7136\u540e\u7531\u96c6\u7fa4\u7f51\u7edc\u7ec4\u4ef6\u8fdb\u884c\u5904\u7406\u3002\u6240\u4ee5\u5728\u8282\u70b9\u5185\u8bbf\u95eeservice\u65f6\uff0c\u5b9e\u9645\u8bbf\u95ee\u7684\u662f\u8282\u70b9\u4e0a\u7684\u67d0\u4e2a\u7aef\u53e3\u3002\u5982\u679c\u5c06\u6293\u5305\u5bfc\u51fa\u4e3acap\u6587\u4ef6\uff0c\u53ef\u4ee5\u770b\u5230\u8bf7\u6c42\u7684\u76ee\u7684IP\u4ecd\u7136\u662f10.0.58.158\uff0c\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355414\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u8fd9\u4e5f\u89e3\u91ca\u4e86\u4e3a\u4ec0\u4e48clusterIP\u53ea\u80fd\u5728\u96c6\u7fa4\u5185\u7684\u8282\u70b9\u6216\u8005pod\u8bbf\u95ee\uff0c\u56e0\u4e3a\u96c6\u7fa4\u5916\u7684\u8bbe\u5907\u6ca1\u6709k8s\u7f51\u7edc\u7ec4\u4ef6\u521b\u5efa\u7684iptables\u89c4\u5219\uff0c\u4e0d\u80fd\u5c06\u8bf7\u6c42service\u5730\u5740\u8f6c\u4e3a\u8bf7\u6c42\u8282\u70b9\u7684\u7aef\u53e3\uff0c\u5373\u4f7f\u6570\u636e\u5305\u53d1\u9001\u81f3\u96c6\u7fa4\uff0c\u7531\u4e8eservice\u7684clusterIP\u5728\u8282\u70b9\u7684\u7f51\u7edc\u4e2d\u5b9e\u9645\u662f\u4e0d\u5b58\u5728\u7684\uff0c\u56e0\u6b64\u4f1a\u88ab\u4e22\u5f03\u3002\uff08\u5947\u602a\u7684\u59ff\u52bf\u53c8\u589e\u957f\u4e86\u5462\uff09\u56de\u5230\u95ee\u9898\u672c\u8eab\uff0c\u5728\u8f6c\u53d1\u8282\u70b9\u4e0a\u6293\u53d6service\u76f8\u5173\u5305\uff0c\u53d1\u73b0service\u6ca1\u6709\u50cf\u8f6c\u53d1\u5230pod\u6240\u5728\u8282\u70b9\u65f6\u7ed9\u5ba2\u6237\u7aef\u56de\u5305\u3002\u6211\u4eec\u518d\u6267\u884c\u547d\u4ee4tcpdump -i any host 172.16.0.50 -w \/tmp\/fwd-node-client.cap\u4ee5\u5ba2\u6237\u7aef\u7ef4\u5ea6\u6293\u5305\uff0c\u5305\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355415\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u6211\u4eec\u53d1\u73b0\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u8282\u70b9node B\u4e0a\u7684service\u540e\uff0cservice\u540c\u6837\u505a\u4e86DNAT\uff0c\u5c06\u8bf7\u6c42\u8f6c\u53d1\u5230node A\u4e0a\u768410.0.0.13\u3002\u4f46\u662f\u5728\u8f6c\u53d1\u8282\u70b9\u4e0a\u6ca1\u6709\u6536\u523010.0.0.13\u56de\u7ed9\u5ba2\u6237\u7aef\u7684\u4efb\u4f55\u6570\u636e\u5305\uff0c\u4e4b\u540e\u5ba2\u6237\u7aef\u91cd\u4f20\u4e86\u51e0\u6b21\u8bf7\u6c42\u5305\uff0c\u5747\u6ca1\u6709\u56de\u5e94\u3002<\/p>\n<p>\u90a3\u4e48node A\u662f\u5426\u6536\u5230\u4e86\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u5305\u5462\uff1fpod\u53c8\u6709\u6ca1\u6709\u7ed9\u5ba2\u6237\u7aef\u56de\u5305\u5462\uff1f<\/p>\n<p>\u6211\u4eec\u79fb\u6b65node A\u8fdb\u884c\u6293\u5305\u3002\u5728node B\u4e0a\u7684\u6293\u5305\u6211\u4eec\u53ef\u4ee5\u83b7\u6089node A\u4e0a\u5e94\u8be5\u53ea\u6709\u5ba2\u6237\u7aefIP\u548cpod IP\u7684\u4ea4\u4e92\uff0c\u56e0\u6b64\u6211\u4eec\u5c31\u4ece\u8fd9\u4e24\u4e2a\u7ef4\u5ea6\u6293\u5305\u3002\u6839\u636e\u4e4b\u524d\u6293\u5305\u7684\u5206\u6790\u7ed3\u679c\uff0c\u6570\u636e\u5305\u8fdb\u5165\u8282\u70b9\u5185\u4e4b\u540e\uff0c\u5e94\u8be5\u901a\u8fc7\u865a\u62df\u8bbe\u5907cni34f0b149874\u4e0epod\u4ea4\u4e92\u3002\u800cnode B\u8282\u70b9\u8bbf\u95eepod\u5e94\u8be5\u4ecenode A\u7684\u5f39\u6027\u7f51\u5361eth1\u8fdb\u5165\u8282\u70b9\uff0c\u800c\u4e0d\u662feth0\uff0c\u4e3a\u4e86\u9a8c\u8bc1\uff0c\u9996\u5148\u6267\u884c\u547d\u4ee4tcpdump -i eth0 host 172.16.0.50\u548ctcpdump -i eth0 host 10.0.0.13\uff0c\u6ca1\u6709\u6293\u5230\u4efb\u4f55\u6570\u636e\u5305\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355416\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u8bf4\u660e\u6570\u636e\u5305\u6ca1\u6709\u8d70eth0\u3002\u518d\u5206\u522b\u6267\u884ctcpdump -i eth1 host 172.16.0.50 -w \/tmp\/dst-node-client-eth1.cap\u548ctcpdump -i cni34f0b149874 host 172.16.0.50 -w \/tmp\/dst-node-client-cni.cap\u6293\u53d6\u5ba2\u6237\u7aef\u7ef4\u5ea6\u6570\u636e\u5305\uff0c\u5bf9\u6bd4\u53d1\u73b0\u6570\u636e\u5305\u5185\u5bb9\u5b8c\u5168\u4e00\u81f4\uff0c\u8bf4\u660e\u6570\u636e\u5305\u4eceeth1\u8fdb\u5165Node A\u540e\uff0c\u901a\u8fc7\u7cfb\u7edf\u5185\u8def\u7531\u8f6c\u53d1\u81f3cni34f0b149874\u3002\u6570\u636e\u5305\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355417\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u53ef\u4ee5\u770b\u5230\u5ba2\u6237\u7aef\u7ed9pod\u53d1\u5305\u540e\uff0cpod\u7ed9\u5ba2\u6237\u7aef\u56de\u4e86\u5305\u3002\u6267\u884ctcpdump -i eth1 host 10.0.0.13 -w \/tmp\/dst-node-pod-eth1.cap\u548ctcpdump -i host 10.0.0.13 -w \/tmp\/dst-node-pod-cni.cap\u6293\u53d6pod\u7ef4\u5ea6\u6570\u636e\u5305\uff0c\u5bf9\u6bd4\u53d1\u73b0\u6570\u636e\u5305\u5185\u5bb9\u5b8c\u5168\u4e00\u81f4\uff0c\u8bf4\u660epod\u7ed9\u5ba2\u6237\u7aef\u7684\u56de\u5305\u901a\u8fc7cni34f0b149874\u53d1\u51fa\uff0c\u7136\u540e\u4eceeth1\u7f51\u5361\u79bb\u5f00node A\u8282\u70b9\u3002\u6570\u636e\u5305\u5185\u5bb9\u4e5f\u53ef\u4ee5\u770b\u5230pod\u7ed9\u5ba2\u6237\u7aef\u8fd4\u56de\u4e86\u5305\uff0c\u4f46\u6ca1\u6709\u6536\u5230\u5ba2\u6237\u7aef\u5bf9\u4e8e\u8fd4\u56de\u5305\u7684\u56de\u5e94\uff0c\u89e6\u53d1\u4e86\u91cd\u4f20\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355418\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u90a3\u4e48\u65e2\u7136pod\u7684\u56de\u5305\u5df2\u7ecf\u53d1\u51fa\uff0c\u4e3a\u4ec0\u4e48node B\u4e0a\u6ca1\u6709\u6536\u5230\u56de\u5305\uff0c\u5ba2\u6237\u7aef\u4e5f\u6ca1\u6709\u6536\u5230\u56de\u5305\u5462\uff1f\u67e5\u770beth1\u7f51\u5361\u6240\u5c5e\u7684pod\u5b50\u7f51\u8def\u7531\u8868\uff0c\u6211\u4eec\u604d\u7136\u5927\u609f\uff01<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355419\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u7531\u4e8epod\u7ed9\u5ba2\u6237\u7aef\u56de\u5305\u662f\u4ecenode A\u7684eth1\u7f51\u5361\u53d1\u51fa\u7684\uff0c\u6240\u4ee5\u867d\u7136\u6309\u7167\u6b63\u5e38DNAT\u89c4\u5219\uff0c\u6570\u636e\u5305\u5e94\u8be5\u53d1\u56de\u7ed9node B\u4e0a\u7684service\u7aef\u53e3\uff0c\u4f46\u662f\u53d7eth1\u5b50\u7f51\u8def\u7531\u8868\u5f71\u54cd\uff0c\u6570\u636e\u5305\u76f4\u63a5\u88ab\u201c\u52ab\u6301\u201d\u5230\u4e86k8s-ipsec-bj\u8fd9\u4e2a\u4e3b\u673a\u4e0a\u3002\u800c\u6570\u636e\u5305\u5230\u4e86\u8fd9\u4e2a\u4e3b\u673a\u4e0a\u4e4b\u540e\uff0c\u7531\u4e8e\u6ca1\u6709\u7ecf\u8fc7service\u7684\u8f6c\u6362\uff0c\u56de\u5305\u7684\u6e90\u5730\u5740\u662fpod\u5730\u574010.0.0.13\uff0c\u76ee\u7684\u5730\u5740\u662f172.16.0.50\uff0c\u8fd9\u4e2a\u6570\u636e\u5305\u56de\u590d\u7684\u662f\u6e90\u5730\u5740172.16.0.50\uff0c\u76ee\u7684\u5730\u574010.0.58.158\u8fd9\u4e2a\u6570\u636e\u5305\u3002\u76f8\u5f53\u4e8e\u8bf7\u6c42\u5305\u7684\u76ee\u7684\u5730\u5740\u548c\u56de\u590d\u5305\u7684\u6e90\u5730\u5740\u4e0d\u4e00\u81f4\uff0c\u5bf9\u4e8ek8s-ipsec-bj\u6765\u8bf4\uff0c\u53ea\u770b\u5230\u4e8610.0.0.13\u7ed9172.16.0.50\u7684reply\u5305\uff0c\u4f46\u662f\u6ca1\u6709\u6536\u5230\u8fc7172.16.0.50\u7ed910.0.0.13\u7684request\u5305\uff0c\u4e91\u5e73\u53f0\u865a\u62df\u7f51\u7edc\u7684\u673a\u5236\u662f\u9047\u5230\u53ea\u6709reply\u5305\uff0c\u6ca1\u6709request\u5305\u7684\u60c5\u51b5\u4f1a\u5c06request\u5305\u4e22\u5f03,\u907f\u514d\u5229\u7528\u5730\u5740\u6b3a\u9a97\u53d1\u8d77\u7f51\u7edc\u653b\u51fb\u3002\u6240\u4ee5\u5ba2\u6237\u7aef\u4e0d\u4f1a\u6536\u523010.0.0.13\u7684\u56de\u5305\uff0c\u4e5f\u5c31\u65e0\u6cd5\u5b8c\u6210\u5bf9service\u7684\u8bf7\u6c42\u3002\u5728\u8fd9\u4e2a\u573a\u666f\u4e0b\uff0c\u6570\u636e\u5305\u7684\u901a\u8def\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355420\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u6b64\u65f6\u5ba2\u6237\u7aef\u53ef\u4ee5\u6210\u529f\u8bf7\u6c42pod\u7684\u539f\u56e0\u4e5f\u4e00\u76ee\u4e86\u7136 \uff0c\u8bf7\u6c42pod\u7684\u6570\u636e\u901a\u8def\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355421\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u8bf7\u6c42\u5305\u548c\u8fd4\u56de\u5305\u7684\u8def\u5f84\u4e00\u81f4\uff0c\u90fd\u7ecf\u8fc7k8s-ipsec-bj\u8282\u70b9\u4e14\u6e90\u76eeIP\u6ca1\u6709\u53d1\u751f\u6539\u53d8\uff0c\u56e0\u6b64pod\u53ef\u4ee5\u8fde\u901a\u3002<\/p>\n<p>\u770b\u5230\u8fd9\u91cc\uff0c\u673a\u667a\u7684\u7ae5\u978b\u53ef\u80fd\u5df2\u7ecf\u60f3\u5230\uff0c\u90a3\u4fee\u6539eth1\u6240\u5c5e\u7684pod\u5b50\u7f51\u8def\u7531\uff0c\u8ba9\u53bb\u5f80172.16.0.50\u7684\u6570\u636e\u5305\u4e0b\u4e00\u8df3\u4e0d\u53d1\u9001\u5230k8s-ipsec-bj\uff0c\u800c\u662f\u8fd4\u56de\u7ed9k8s-node-B\uff0c\u4e0d\u5c31\u53ef\u4ee5\u8ba9\u56de\u5305\u6cbf\u7740\u6765\u8def\u539f\u8def\u8fd4\u56de\uff0c\u4e0d\u4f1a\u88ab\u4e22\u5f03\u5417\uff1f<\/p>\n<p>\u662f\u7684\uff0c\u7ecf\u8fc7\u6211\u4eec\u7684\u6d4b\u8bd5\u9a8c\u8bc1\uff0c\u8fd9\u6837\u786e\u5b9e\u53ef\u4ee5\u4f7f\u5ba2\u6237\u7aef\u6210\u529f\u8bf7\u6c42\u670d\u52a1\u3002\u4f46\u662f\u522b\u5fd8\u4e86\uff0c\u7528\u6237\u8fd8\u6709\u4e00\u4e2a\u9700\u6c42\u662f\u5ba2\u6237\u7aef\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u540e\u7aefpod\uff0c\u5982\u679cpod\u56de\u5305\u8fd4\u56de\u7ed9node B\uff0c\u90a3\u4e48\u5ba2\u6237\u7aef\u8bf7\u6c42pod\u65f6\u7684\u6570\u636e\u901a\u8def\u662f\u600e\u6837\u7684\u5462\uff1f<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355422\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u5982\u56fe\u6240\u793a\uff0c\u53ef\u4ee5\u770b\u5230\u5ba2\u6237\u7aef\u5bf9Pod\u7684\u8bf7\u6c42\u5230\u8fbek8s-ipsec-bj\u540e\uff0c\u7531\u4e8e\u662f\u540c\u4e00vpc\u5185\u7684\u5730\u5740\u8bbf\u95ee\uff0c\u6240\u4ee5\u9075\u5faalocal\u8def\u7531\u89c4\u5219\u76f4\u63a5\u8f6c\u53d1\u5230node A eth1\u7f51\u5361\uff0c\u800cpod\u7ed9\u5ba2\u6237\u7aef\u56de\u5305\u65f6\uff0c\u53d7eth1\u7f51\u5361\u8def\u7531\u63a7\u5236\uff0c\u53d1\u9001\u5230\u4e86node B\u4e0a\u3002node B\u4e4b\u524d\u6ca1\u6709\u6536\u5230\u8fc7\u5ba2\u6237\u7aef\u5bf9pod\u7684request\u5305\uff0c\u540c\u6837\u4f1a\u9047\u5230\u53ea\u6709reply\u5305\u6ca1\u6709request\u5305\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u56de\u5305\u88ab\u4e22\u5f03\uff0c\u5ba2\u6237\u7aef\u65e0\u6cd5\u8bf7\u6c42pod\u3002<\/p>\n<p>\u81f3\u6b64\uff0c\u6211\u4eec\u641e\u6e05\u695a\u4e86\u4e3a\u4ec0\u4e48\u5ba2\u6237\u7aef\u8bf7\u6c42\u8f6c\u53d1\u81f3service\u540e\u7aefpod\u4e0d\u5728\u7684\u8282\u70b9\u4e0a\u65f6\u65e0\u6cd5\u6210\u529f\u8bbf\u95eeservice\u7684\u539f\u56e0\u3002\u90a3\u4e48\u4e3a\u4ec0\u4e48\u5728\u6b64\u65f6\u867d\u7136\u8bf7\u6c42service\u7684\u7aef\u53e3\u5931\u8d25\uff0c\u4f46\u662f\u53ef\u4ee5ping\u901aservice\u5730\u5740\u5462\uff1f<\/p>\n<p>\u653b\u57ce\u72ee\u63a8\u65ad\uff0c\u65e2\u7136service\u5bf9\u540e\u7aef\u7684pod\u8d77\u5230DNAT\u548c\u8d1f\u8f7d\u5747\u8861\u7684\u4f5c\u7528\uff0c\u90a3\u4e48\u5f53\u5ba2\u6237\u7aefping service\u5730\u5740\u65f6\uff0cICMP\u5305\u5e94\u8be5\u662f\u7531service\u76f4\u63a5\u5e94\u7b54\u5ba2\u6237\u7aef\u7684\uff0c\u5373service\u4ee3\u66ff\u540e\u7aefpod\u7b54\u590d\u5ba2\u6237\u7aef\u7684ping\u5305\u3002\u4e3a\u4e86\u9a8c\u8bc1\u6211\u4eec\u7684\u63a8\u65ad\u662f\u5426\u6b63\u786e\uff0c\u6211\u4eec\u5728\u96c6\u7fa4\u4e2d\u65b0\u5efa\u4e00\u4e2a\u6ca1\u6709\u5173\u8054\u4efb\u4f55\u540e\u7aef\u7684\u7a7a\u670d\u52a1\uff0c\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355423\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u7136\u540e\u5728\u5ba2\u6237\u7aefping 10.0.62.200\uff0c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355424\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u679c\u4e0d\u5176\u7136\uff0c\u5373\u4f7fservice\u540e\u7aef\u6ca1\u6709\u4efb\u4f55pod\uff0c\u4e5f\u53ef\u4ee5ping\u901a\uff0c\u56e0\u6b64\u8bc1\u660eICMP\u5305\u5747\u4e3aservice\u4ee3\u7b54\uff0c\u4e0d\u5b58\u5728\u5b9e\u9645\u8bf7\u6c42\u540e\u7aefpod\u65f6\u7684\u95ee\u9898\uff0c\u56e0\u6b64\u53ef\u4ee5ping\u901a\u3002<\/p>\n<p><strong>\u7b2c\u4e94\u90e8\u5206\uff1a\u5929\u65e0\u7edd\u4eba\u4e4b\u8def<\/strong><\/p>\n<p>\u65e2\u7136\u8d39\u5c3d\u5468\u6298\u627e\u5230\u4e86\u8bbf\u95ee\u5931\u8d25\u7684\u539f\u56e0\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u8981\u60f3\u529e\u6cd5\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002\u4e8b\u5b9e\u4e0a\u53ea\u8981\u60f3\u529e\u6cd5\u8ba9pod\u8de8\u8282\u70b9\u7ed9\u5ba2\u6237\u7aef\u56de\u5305\u65f6\u9690\u85cf\u81ea\u5df1\u7684IP\uff0c\u5bf9\u5916\u663e\u793a\u7684\u662fservice\u7684IP\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u5305\u88ab\u4e22\u5f03\u3002\u539f\u7406\u4e0a\u7c7b\u4f3c\u4e8eSNAT\uff08\u57fa\u4e8e\u6e90IP\u7684\u5730\u5740\u8f6c\u6362\uff09\u3002\u53ef\u4ee5\u7c7b\u6bd4\u4e3a\u6ca1\u6709\u516c\u7f51IP\u7684\u5c40\u57df\u7f51\u8bbe\u5907\u6709\u81ea\u5df1\u7684\u5185\u7f51IP\uff0c\u5f53\u8bbf\u95ee\u516c\u7f51\u65f6\u9700\u8981\u901a\u8fc7\u7edf\u4e00\u7684\u516c\u7f51\u51fa\u53e3\uff0c\u800c\u6b64\u65f6\u5916\u90e8\u770b\u5230\u7684\u5ba2\u6237\u7aefIP\u662f\u516c\u7f51\u51fa\u53e3\u7684IP\uff0c\u5e76\u4e0d\u662f\u5c40\u57df\u7f51\u8bbe\u5907\u7684\u5185\u7f51IP\u3002\u5b9e\u73b0SNAT\uff0c\u6211\u4eec\u9996\u5148\u4f1a\u60f3\u5230\u901a\u8fc7\u8282\u70b9\u64cd\u4f5c\u7cfb\u7edf\u4e0a\u7684iptables\u89c4\u5219\u3002\u6211\u4eec\u5728pod\u6240\u5728\u8282\u70b9node A\u4e0a\u6267\u884ciptables-save\u547d\u4ee4\uff0c\u67e5\u770b\u7cfb\u7edf\u5df2\u6709\u7684iptables\u89c4\u5219\u90fd\u6709\u54ea\u4e9b\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355425\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355426\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><strong>\u6572\u9ed1\u677f\uff0c\u6ce8\u610f\u5566<\/strong><br \/>\u53ef\u4ee5\u770b\u5230\u7cfb\u7edf\u521b\u5efa\u4e86\u8fd1\u5343\u6761iptables\u89c4\u5219\uff0c\u5927\u591a\u6570\u4e0ek8s\u6709\u5173\u3002\u6211\u4eec\u91cd\u70b9\u5173\u6ce8\u4e0a\u56fe\u4e2d\u7684nat\u7c7b\u578b\u89c4\u5219\uff0c\u53d1\u73b0\u4e86\u6709\u5982\u4e0b\u51e0\u6761\u5f15\u8d77\u4e86\u6211\u4eec\u7684\u6ce8\u610f\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355427\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<ul>\n<li>\u9996\u5148\u770b\u7ea2\u6846\u90e8\u5206\u89c4\u5219<br \/>-A KUBE-SERVICES -m comment &#8211;comment &#8220;Kubernetes service cluster ip + port for masquerade purpose&#8221; -m set &#8211;match-set KUBE-CLUSTER-IP src,dst -j KUBE-MARK-MASQ<\/li>\n<\/ul>\n<p>\u8be5\u89c4\u5219\u8868\u793a\u5982\u679c\u8bbf\u95ee\u7684\u6e90\u5730\u5740\u6216\u8005\u76ee\u7684\u5730\u5740\u662fcluster ip +\u7aef\u53e3\uff0c\u51fa\u4e8emasquerade\u76ee\u7684\uff0c\u5c06\u8df3\u8f6c\u81f3KUBE-MARK-MASQ\u94fe\uff0cmasquerade\u4e5f\u5c31\u662f\u5730\u5740\u4f2a\u88c5\u7684\u610f\u601d\uff01\u5728NAT\u8f6c\u6362\u4e2d\u4f1a\u7528\u5230\u5730\u5740\u4f2a\u88c5\u3002\u63a5\u4e0b\u6765\u770b\u84dd\u6846\u90e8\u5206\u89c4\u5219<\/p>\n<p>-A KUBE-MARK-MASQ -j MARK &#8211;set-xmark 0x4000\/0x4000<\/p>\n<p>\u8be5\u89c4\u5219\u8868\u793a\u5bf9\u4e8e\u6570\u636e\u5305\u6253\u4e0a\u9700\u8981\u505a\u5730\u5740\u4f2a\u88c5\u7684\u6807\u8bb00x4000\/0x4000\u3002<\/p>\n<ul>\n<li>\u6700\u540e\u770b\u9ec4\u6846\u90e8\u5206\u89c4\u5219<br \/>-A KUBE-POSTROUTING -m comment &#8211;comment &#8220;kubernetes service traffic requiring SNAT&#8221; -m mark &#8211;mark 0x4000\/0x4000 -j MASQUERADE<\/li>\n<\/ul>\n<p>\u8be5\u89c4\u5219\u8868\u793a\u5bf9\u4e8e\u6807\u8bb0\u4e3a0x4000\/0x4000\u9700\u8981\u505aSNAT\u7684\u6570\u636e\u5305\uff0c\u5c06\u8df3\u8f6c\u81f3MASQUERADE\u94fe\u8fdb\u884c\u5730\u5740\u4f2a\u88c5\u3002<\/p>\n<p>\u8fd9\u4e09\u6761\u89c4\u5219\u6240\u505a\u7684\u64cd\u4f5c\u8c8c\u4f3c\u6b63\u662f\u6211\u4eec\u9700\u8981iptables\u5e2e\u6211\u4eec\u5b9e\u73b0\u7684\uff0c\u4f46\u662f\u4ece\u4e4b\u524d\u7684\u6d4b\u8bd5\u6765\u770b\u663e\u7136\u8fd9\u4e09\u6761\u89c4\u5219\u5e76\u6ca1\u6709\u751f\u6548\u3002\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f\u662f\u5426\u662fk8s\u7684\u7f51\u7edc\u7ec4\u4ef6\u91cc\u6709\u67d0\u4e2a\u53c2\u6570\u63a7\u5236\u7740\u662f\u5426\u4f1a\u5bf9\u8bbf\u95eeclusterIP\u65f6\u7684\u6570\u636e\u5305\u8fdb\u884cSNAT\uff1f<\/p>\n<p>\u8fd9\u5c31\u8981\u4ece\u8d1f\u8d23service\u4e0epod\u4e4b\u95f4\u7f51\u7edc\u4ee3\u7406\u8f6c\u53d1\u7684\u7ec4\u4ef6\u2014\u2014kube-proxy\u7684\u5de5\u4f5c\u6a21\u5f0f\u548c\u53c2\u6570\u8fdb\u884c\u7814\u7a76\u4e86\u3002\u6211\u4eec\u5df2\u7ecf\u77e5\u9053service\u4f1a\u5bf9\u540e\u7aefpod\u8fdb\u884c\u8d1f\u8f7d\u5747\u8861\u548c\u4ee3\u7406\u8f6c\u53d1\uff0c\u8981\u60f3\u5b9e\u73b0\u8be5\u529f\u80fd\uff0c\u4f9d\u8d56\u7684\u662fkube-proxy\u7ec4\u4ef6\uff0c\u4ece\u540d\u79f0\u4e0a\u53ef\u4ee5\u770b\u51fa\u8fd9\u662f\u4e00\u4e2a\u4ee3\u7406\u6027\u8d28\u7684\u7f51\u7edc\u7ec4\u4ef6\u3002\u5b83\u4ee5pod\u5f62\u5f0f\u8fd0\u884c\u5728\u6bcf\u4e2ak8s\u8282\u70b9\u4e0a\uff0c\u5f53\u4ee5service\u7684clusterIP+\u7aef\u53e3\u65b9\u5f0f\u8bbf\u95ee\u65f6\uff0c\u901a\u8fc7iptables\u89c4\u5219\u5c06\u8bf7\u6c42\u8f6c\u53d1\u81f3\u8282\u70b9\u4e0a\u5bf9\u5e94\u7684\u968f\u673a\u7aef\u53e3\uff0c\u4e4b\u540e\u8bf7\u6c42\u7531kube-proxy\u7ec4\u4ef6\u63a5\u624b\u5904\u7406\uff0c\u901a\u8fc7kube-proxy\u5185\u90e8\u7684\u8def\u7531\u548c\u8c03\u5ea6\u7b97\u6cd5\uff0c\u8f6c\u53d1\u81f3\u76f8\u5e94\u7684\u540e\u7aefPod\u3002\u6700\u521d\uff0ckube-proxy\u7684\u5de5\u4f5c\u6a21\u5f0f\u662fuserspace\uff08\u7528\u6237\u7a7a\u95f4\u4ee3\u7406\uff09\u6a21\u5f0f\uff0ckube-proxy\u8fdb\u7a0b\u5728\u8fd9\u4e00\u65f6\u671f\u662f\u4e00\u4e2a\u771f\u5b9e\u7684TCP\/UDP\u4ee3\u7406\uff0c\u7c7b\u4f3cHA Proxy\u3002\u7531\u4e8e\u8be5\u6a21\u5f0f\u57281.2\u7248\u672ck8s\u5f00\u59cb\u5df2\u88abiptables\u6a21\u5f0f\u53d6\u4ee3\uff0c\u5728\u6b64\u4e0d\u505a\u8d58\u8ff0\uff0c\u6709\u5174\u8da3\u7684\u7ae5\u978b\u53ef\u4ee5\u81ea\u884c\u7814\u7a76\u4e0b\u3002<\/p>\n<p>1.2\u7248\u672c\u5f15\u5165\u7684iptables\u6a21\u5f0f\u4f5c\u4e3akube-proxy\u7684\u9ed8\u8ba4\u6a21\u5f0f\uff0ckube-proxy\u672c\u8eab\u4e0d\u518d\u8d77\u5230\u4ee3\u7406\u7684\u4f5c\u7528\uff0c\u800c\u662f\u901a\u8fc7\u521b\u5efa\u548c\u7ef4\u62a4\u5bf9\u5e94\u7684iptables\u89c4\u5219\u5b9e\u73b0service\u5230pod\u7684\u6d41\u91cf\u8f6c\u53d1\u3002\u4f46\u662f\u4f9d\u8d56iptables\u89c4\u5219\u5b9e\u73b0\u4ee3\u7406\u5b58\u5728\u65e0\u6cd5\u907f\u514d\u7684\u7f3a\u9677\uff0c\u5728\u96c6\u7fa4\u4e2d\u7684service\u548cpod\u5927\u91cf\u589e\u52a0\u540e\uff0ciptables\u89c4\u5219\u7684\u6570\u91cf\u4e5f\u4f1a\u6025\u5267\u589e\u52a0\uff0c\u4f1a\u5bfc\u81f4\u8f6c\u53d1\u6027\u80fd\u663e\u8457\u4e0b\u964d\uff0c\u6781\u7aef\u60c5\u51b5\u4e0b\u751a\u81f3\u4f1a\u51fa\u73b0\u89c4\u5219\u4e22\u5931\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u4e3a\u4e86\u89e3\u51b3iptables\u6a21\u5f0f\u7684\u5f0a\u7aef\uff0cK8S\u57281.8\u7248\u672c\u5f00\u59cb\u5f15\u5165IPVS\uff08IP Virtual Server\uff09\u6a21\u5f0f\u3002IPVS\u6a21\u5f0f\u4e13\u95e8\u7528\u4e8e\u9ad8\u6027\u80fd\u8d1f\u8f7d\u5747\u8861\uff0c\u4f7f\u7528\u66f4\u9ad8\u6548\u7684hash\u8868\u6570\u636e\u7ed3\u6784\uff0c\u4e3a\u5927\u578b\u96c6\u7fa4\u7ed9\u51fa\u4e86\u66f4\u597d\u7684\u6269\u5c55\u6027\u548c\u6027\u80fd\u3002\u6bd4iptables\u6a21\u5f0f\u652f\u6301\u66f4\u590d\u6742\u7684\u8d1f\u8f7d\u5747\u8861\u8c03\u5ea6\u7b97\u6cd5\u7b49\u3002\u6258\u7ba1\u96c6\u7fa4\u7684kube-proxy\u6b63\u662f\u4f7f\u7528\u4e86IPVS\u6a21\u5f0f\u3002<\/p>\n<p>\u4f46\u662fIPVS\u6a21\u5f0f\u65e0\u6cd5\u7ed9\u4e0e\u5305\u8fc7\u6ee4\uff0c\u5730\u5740\u4f2a\u88c5\u548cSNAT\u7b49\u529f\u80fd\uff0c\u6240\u4ee5\u5728\u9700\u8981\u4f7f\u7528\u8fd9\u4e9b\u529f\u80fd\u7684\u573a\u666f\u4e0b\uff0cIPVS\u8fd8\u662f\u8981\u642d\u914diptables\u89c4\u5219\u4f7f\u7528\u3002\u7b49\u7b49\uff0c\u5730\u5740\u4f2a\u88c5\u548cSNAT\uff0c\u8fd9\u4e0d\u6b63\u662f\u6211\u4eec\u4e4b\u524d\u5728iptables\u89c4\u5219\u4e2d\u770b\u5230\u8fc7\u7684\uff1f\u8fd9\u4e5f\u5c31\u662f\u8bf4\uff0ciptables\u5728\u4e0d\u8fdb\u884c\u5730\u5740\u4f2a\u88c5\u548cSNAT\u65f6\uff0c\u4e0d\u4f1a\u9075\u5faa\u76f8\u5e94\u7684iptables\u89c4\u5219\uff0c\u800c\u4e00\u65e6\u8bbe\u7f6e\u4e86\u67d0\u4e2a\u53c2\u6570\u5f00\u542f\u5730\u5740\u4f2a\u88c5\u548cSNAT\uff0c\u4e4b\u524d\u770b\u5230\u7684iptables\u89c4\u5219\u5c31\u4f1a\u751f\u6548\uff01\u4e8e\u662f\u6211\u4eec\u5230kubernetes\u5b98\u7f51\u67e5\u627ekube-proxy\u7684\u5de5\u4f5c\u53c2\u6570\uff0c\u6709\u4e86\u4ee4\u4eba\u6fc0\u52a8\u7684\u53d1\u73b0\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355428\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u597d\u4e00\u4e2a\u84e6\u7136\u56de\u9996\uff01\u653b\u57ce\u72ee\u7684\u7b2c\u516d\u611f\u544a\u8bc9\u6211\u4eec\uff0c&#8211;masquerade-all\u53c2\u6570\u5c31\u662f\u89e3\u51b3\u6211\u4eec\u95ee\u9898\u7684\u5173\u952e\uff01<\/p>\n<p><strong>\u7b2c\u516d\u90e8\u5206\uff1a\u771f\u00b7\u65b9\u6cd5\u6bd4\u56f0\u96be\u591a<\/strong><\/p>\n<p>\u6211\u4eec\u51b3\u5b9a\u6d4b\u8bd5\u5f00\u542f\u4e0b&#8211;masquerade-all\u8fd9\u4e2a\u53c2\u6570\u3002kube-proxy\u5728\u96c6\u7fa4\u4e2d\u7684\u6bcf\u4e2a\u8282\u70b9\u4e0a\u4ee5pod\u5f62\u5f0f\u8fd0\u884c\uff0c\u800ckube-proxy\u7684\u53c2\u6570\u914d\u7f6e\u90fd\u4ee5configmap\u5f62\u5f0f\u6302\u8f7d\u5230pod\u4e0a\u3002\u6211\u4eec\u6267\u884ckubectl get cm -n kube-system\u67e5\u770bkube-proxy\u7684configmap\uff0c\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355429\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u7ea2\u6846\u91cc\u7684\u5c31\u662fkube-proxy\u7684\u914d\u7f6econfigmap\uff0c\u6267\u884ckubectl edit cm kube-proxy-config-khc289cbhd -n kube-system\u7f16\u8f91\u8fd9\u4e2aconfigmap\uff0c\u5982\u56fe\u6240\u793a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355430\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u627e\u5230\u4e86masqueradeALL\u53c2\u6570\uff0c\u9ed8\u8ba4\u662ffalse\uff0c\u6211\u4eec\u4fee\u6539\u4e3atrue\uff0c\u7136\u540e\u4fdd\u5b58\u4fee\u6539\u3002<\/p>\n<p>\u8981\u60f3\u4f7f\u914d\u7f6e\u751f\u6548\uff0c\u9700\u8981\u9010\u4e00\u5220\u9664\u5f53\u524d\u7684kube-proxy pod\uff0cdaemonset\u4f1a\u81ea\u52a8\u91cd\u5efapod\uff0c\u91cd\u5efa\u7684pod\u4f1a\u6302\u8f7d\u4fee\u6539\u8fc7\u7684configmap\uff0cmasqueradeALL\u529f\u80fd\u4e5f\u5c31\u5f00\u542f\u4e86\u3002\u5982\u56fe\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355431\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u671f\u5f85\u5730\u6413\u624b\u624b<br \/>\u63a5\u4e0b\u6765\u6fc0\u52a8\u4eba\u5fc3\u7684\u65f6\u523b\u5230\u6765\u4e86\uff0c\u6211\u4eec\u5c06\u8bbf\u95eeservice\u7684\u8def\u7531\u6307\u5411node B\uff0c\u7136\u540e\u5728\u4e0a\u6d77\u5ba2\u6237\u7aef\u4e0a\u6267\u884cpaping 10.0.58.158 -p 80\u89c2\u5bdf\u6d4b\u8bd5\u7ed3\u679c\uff08\u671f\u5f85\u5730\u6413\u624b\u624b\uff09\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355432\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u6b64\u60c5\u6b64\u666f\uff0c\u4e0d\u7981\u8ba9\u653b\u57ce\u72ee\u6d41\u4e0b\u4e86\u6b23\u559c\u7684\u6cea\u6c34\u2026\u2026<\/p>\n<p>\u518d\u6d4b\u8bd5\u4e0bcurl <a href=\"https:\/\/link.segmentfault.com\/?enc=LWHQE8mGAyOxvLAtHOs5CQ%3D%3D.sle8ghDkL262RyEJJi%2FvBkbNNlCySt49iaca4Vt1tLk%3D\" rel=\"nofollow\">http:\/\/10.0.58.158<\/a> \u540c\u6837\u53ef\u4ee5\u6210\u529f\uff01\u5965\u529b\u7ed9~<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355433\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u518d\u6d4b\u8bd5\u4e0b\u76f4\u63a5\u8bbf\u95ee\u540e\u7aefPod\uff0c\u4ee5\u53ca\u8bf7\u6c42\u8f6c\u53d1\u81f3pod\u6240\u5728\u8282\u70b9\uff0c\u90fd\u6ca1\u6709\u95ee\u9898\u3002\u81f3\u6b64\u5ba2\u6237\u7684\u9700\u6c42\u7ec8\u4e8e\u534d\u89e3\uff0c\u957f\u8212\u4e00\u53e3\u6c14\uff01<\/p>\n<p><strong>\u5927\u7ed3\u5c40\uff1a\u77e5\u5176\u6240\u4ee5\u7136<\/strong><\/p>\n<p>\u867d\u7136\u95ee\u9898\u5df2\u7ecf\u89e3\u51b3\uff0c\u4f46\u662f\u6211\u4eec\u7684\u63a2\u7a76\u8fd8\u6ca1\u6709\u7ed3\u675f\u3002\u5f00\u542fmasqueradeALL\u53c2\u6570\u540e\uff0cservice\u662f\u5982\u4f55\u5bf9\u6570\u636e\u5305\u505aSNAT\uff0c\u907f\u514d\u4e86\u4e4b\u524d\u7684\u4e22\u5305\u95ee\u9898\u5462\uff1f\u8fd8\u662f\u901a\u8fc7\u6293\u5305\u8fdb\u884c\u5206\u6790\u3002<\/p>\n<p>\u9996\u5148\u5206\u6790\u8f6c\u53d1\u81f3pod\u4e0d\u5728\u7684\u8282\u70b9\u65f6\u7684\u573a\u666f\uff0c\u5ba2\u6237\u7aef\u8bf7\u6c42\u670d\u52a1\u65f6\uff0c\u5728pod\u6240\u5728\u8282\u70b9\u5bf9\u5ba2\u6237\u7aefIP\u8fdb\u884c\u6293\u5305\uff0c\u6ca1\u6709\u6293\u5230\u4efb\u4f55\u5305\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355434\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u8bf4\u660e\u5f00\u542f\u53c2\u6570\u540e\uff0c\u5230\u540e\u7aefpod\u7684\u8bf7\u6c42\u4e0d\u518d\u662f\u4ee5\u5ba2\u6237\u7aefIP\u53d1\u8d77\u7684\u3002<\/p>\n<p>\u5728\u8f6c\u53d1\u8282\u70b9\u5bf9pod IP\u8fdb\u884c\u6293\u5305\u53ef\u4ee5\u6293\u5230\u8f6c\u53d1\u8282\u70b9\u7684service\u7aef\u53e3\u4e0epod\u4e4b\u95f4\u7684\u4ea4\u4e92\u5305<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355435\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" 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decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042355438\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" 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href=\"https:\/\/segmentfault.com\/a\/1190000042355389\">https:\/\/segmentfault.com\/a\/1190000042355389<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u524d\u8a00 \u5728\u672c\u6b21\u6848\u4f8b\u4e2d\uff0c\u6211\u4eec\u7684\u4e2d\u53f0\u6280\u672f\u5de5\u7a0b\u5e08\u9047\u5230\u4e86\u6765\u81ea\u5ba2\u6237\u63d0\u51fa\u7684\u6253\u7834k8s\u4ea7\u54c1\u529f\u80fd\u9650\u5236\u7684\u7279\u6b8a\u9700\u6c42\uff0c\u9762\u5bf9\u8fd9\u4e2a\u6781\u5177\u6311\u6218 [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-10006274","post","type-post","status-publish","format-standard","hentry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006274","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006274"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006274\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006274"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006274"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006274"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}