{"id":35654,"date":"2023-01-09T11:57:41","date_gmt":"2024-01-03T02:18:25","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/k8s%e4%b8%ad%e7%9a%84%e6%95%85%e9%9a%9c%e6%8e%92%e9%99%a4%e5%ae%9e%e4%be%8b2%ef%bc%9a%e5%90%af%e7%94%a8br_netfilter\/"},"modified":"2024-04-29T09:12:07","modified_gmt":"2024-04-29T01:12:07","slug":"k8s%e4%b8%ad%e7%9a%84%e6%95%85%e9%9a%9c%e6%8e%92%e9%99%a4%e5%ae%9e%e4%be%8b2%ef%bc%9a%e5%90%af%e7%94%a8br_netfilter","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/k8s%e4%b8%ad%e7%9a%84%e6%95%85%e9%9a%9c%e6%8e%92%e9%99%a4%e5%ae%9e%e4%be%8b2%ef%bc%9a%e5%90%af%e7%94%a8br_netfilter\/","title":{"rendered":"k8s\u4e2d\u7684\u6545\u969c\u6392\u9664\u5b9e\u4f8b2\uff1a\u542f\u7528br_netfilter"},"content":{"rendered":"

\u5728k8s\u4e2d\u7684\u6545\u969c\u6392\u9664\u5b9e\u4f8b2\uff1a\u542f\u7528br_netfilter\u3002<\/h1>\n

\u6b22\u8fce\u6765\u5230\u89e3\u51b3\u5728Kubernetes\u6df1\u6e0a\u4e2d\u53d1\u73b0\u7684\u795e\u79d8\u7f51\u7edc\u95ee\u9898\u7684\u65c5\u7a0b\u3002\u672c\u6b21\u8bdd\u9898\u5bf9\u4e8e\u90a3\u4e9b\u5bf9\u7f51\u7edc\u4e86\u89e3\u4e0d\u6df1\u7684\u4eba\u6765\u8bf4\u662f\u975e\u5e38\u5177\u6709\u6311\u6218\u6027\u7684\u6545\u969c\u6392\u9664\u6545\u4e8b\u3002<\/p>\n

\u95ee\u9898\u7684\u53d1\u751f de<\/h2>\n

\u6211\u5728Kubernetes\u96c6\u7fa4\u4e2d\u9047\u5230\u4e86\u4e00\u4e2a\u7f55\u89c1\u7684\u95ee\u9898\uff0c\u5373Pod\u4e4b\u95f4\u7684\u540d\u79f0\u89e3\u6790\u4e0d\u6b63\u5e38\u3002\u5f53\u6211\u4f7f\u7528dig\u547d\u4ee4\u6267\u884cDNS\u67e5\u8be2\u65f6\uff0c\u610f\u5916\u7684\u6570\u636e\u6e90\u8fd4\u56de\u4e86\u54cd\u5e94\u3002\u5177\u4f53\u6765\u8bf4\uff0c;; reply from unexpected source: 10.200.2.177#53, expected 10.32.0.10#53\u662f\u9519\u8bef\u7684\u4fe1\u606f\u3002\u4e3a\u4ec0\u4e48\u6211\u5f97\u5230\u7684\u54cd\u5e94\u4e0d\u662f\u6211\u671f\u671b\u7684CoreDNS\u670d\u52a1\u7684IP\u5730\u5740\uff0c\u800c\u662f\u6258\u7ba1Pod\u7684\u8282\u70b9\u7684IP\u5730\u5740\u5462\uff1f<\/p>\n

\u8ffd\u5bfb\u539f\u56e0<\/h2>\n

\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u8c03\u67e5\u4e86GitHub\u7684Issue\u548c\u793e\u533a\u8bba\u575b\u3002\u603b\u7684\u6765\u8bf4\uff0c\u95ee\u9898\u7684\u6838\u5fc3\u4e0e\u7f51\u7edc\u6570\u636e\u5305\u7684\u8def\u7531\u548c\u8fc7\u6ee4\u76f8\u5173\u3002\u5728Kubernetes\u4e2d\uff0c\u7f51\u7edc\u6d41\u91cf\u901a\u5e38\u6839\u636e\u7279\u5b9a\u7684\u89c4\u5219\u548c\u8def\u5f84\u8fdb\u884c\u8def\u7531\u3002\u7136\u800c\uff0c\u5728\u7279\u5b9a\u6761\u4ef6\u4e0b\uff0c\u8fd9\u4e9b\u6570\u636e\u5305\u53ef\u80fd\u4f1a\u91c7\u53d6\u610f\u5916\u7684\u8def\u5f84\u3002<\/p>\n

br_netfilter\u662f\u4ec0\u4e48\uff1f<\/h2>\n

\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u89e3\u91ca\u4e00\u4e0bbr_netfilter\u6a21\u5757\u7684\u4f5c\u7528\u3002\u8be5\u6a21\u5757\u5728Linux\u5185\u6838\u7a7a\u95f4\u4e2d\u8fd0\u884c\uff0c\u5e76\u63d0\u4f9b\u4e86\u5728\u901a\u8fc7\u7f51\u7edc\u6865\u63a5\u7684\u6d41\u91cf\u4e0a\u5e94\u7528Netfilter\u89c4\u5219\uff08\u4f8b\u5982iptables\u89c4\u5219\uff09\u7684\u529f\u80fd\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u65e0\u8bba\u662fPod\u4e4b\u95f4\u8fd8\u662f\u4e0d\u540c\u7f51\u7edc\u6bb5\u4e4b\u95f4\u7684\u901a\u4fe1\uff0c\u90fd\u53ef\u4ee5\u8fdb\u884c\u6d41\u91cf\u63a7\u5236\u548c\u8fc7\u6ee4\u3002<\/p>\n

\u5728\u865a\u62df\u73af\u5883\u4e2d\u8fdb\u884c\u7684\u7b2c\u4e8c\u5c42\u7f51\u7edc\u64cd\u4f5c\u3002<\/h2>\n

\u5728\u7269\u7406\u7f51\u7edc\u73af\u5883\u4e2d\uff0c\u6570\u636e\u94fe\u8def\u5c42\uff08\u7b2c\u4e8c\u5c42\uff09\u901a\u8fc7\u4f7f\u7528MAC\u5730\u5740\u6765\u5b9e\u73b0\u8bbe\u5907\u4e4b\u95f4\u7684\u901a\u4fe1\u3002\u7136\u800c\uff0c\u5728\u865a\u62df\u73af\u5883\u4e2d\uff0c\u8fd9\u4e9b\u7269\u7406\u6982\u5ff5\u662f\u901a\u8fc7\u8f6f\u4ef6\u8fdb\u884c\u4eff\u771f\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5373\u4f7f\u6ca1\u6709\u5b9e\u9645\u7684\u7269\u7406\u8fde\u63a5\uff0c\u57fa\u4e8eMAC\u5730\u5740\u7684\u901a\u4fe1\u548c\u901a\u8fc7\u6865\u63a5\u8fde\u63a5\u7684\u6570\u636e\u5305\u8f6c\u53d1\u7b49\u4ecd\u7136\u4f1a\u8fdb\u884c\u3002<\/p>\n

\u89e3\u51b3\u65b9\u6848<\/h2>\n

\u4f5c\u4e3a\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\uff0c\u5efa\u8bae\u542f\u7528br_netfilter\u6a21\u5757\u3002\u901a\u8fc7\u8fd9\u4e2a\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5bf9\u7f51\u7edc\u6d41\u91cf\u8fdb\u884c\u9002\u5f53\u7684\u8fc7\u6ee4\u548c\u8def\u7531\u89c4\u5219\uff0c\u5e76\u4e14\u53ef\u4ee5\u786e\u4fddPod\u4e4b\u95f4\u7684\u901a\u4fe1\u6309\u7167\u9884\u671f\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n

# br_netfilter\u3092\u6709\u52b9\u306b\u3059\u308b<\/span>\r\nsudo <\/span>modprobe br_netfilter\r\n<\/code><\/pre>\n
\u6b64\u5916\uff0c\u4f5c\u4e3a\u4e00\u79cd\u957f\u671f\u89e3\u51b3\u65b9\u6848\uff0c\u60a8\u8fd8\u53ef\u4ee5\u5c06\u8be5\u6a21\u5757\u6dfb\u52a0\u5230\u7cfb\u7edf\u7684\u542f\u52a8\u8bbe\u7f6e\u4e2d\u3002<\/p>\n
\u7406\u60f3\u4e2d\u7684\u6d41\u91cf\u8fc7\u6ee4\u548c\u95ee\u9898\u5904\u7406<\/h2>\n
\u8ba9\u6211\u4eec\u5177\u4f53\u8003\u8651\u4e00\u4e0b\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5728Kubernetes\u96c6\u7fa4\u5185\u51fa\u73b0\u4e86\u6d41\u91cf\u95ee\u9898\u3002\u4ee5\u4e0b\u662f\u9884\u671f\u6d41\u91cf\u548c\u53d1\u751f\u95ee\u9898\u65f6\u6d41\u91cf\u7684\u793a\u4f8b\u3002<\/p>\n
\u539f\u672c\u671f\u671b\u7684\u4ea4\u901a\u6d41\u91cf\uff1a<\/h3>\n
    \n
  1. \n
      DNS\u67e5\u8be2\u7684\u5f00\u59cb\uff1a\u4ecePod\uff08\u4f8b\u5982\uff1aPod A\uff09\u5411\u670d\u52a1\u540d\u79f0\uff08\u4f8b\u5982\uff1aservice.kubernetes\uff09\u53d1\u51faDNS\u67e5\u8be2\u3002<\/ol>\n<\/li>\n<\/ol>\n
      \u8bf7\u6c42\u7684\u8f6c\u53d1\uff1a\u6b64\u67e5\u8be2\u5c06\u8f6c\u53d1\u5230\u914d\u7f6e\u7684DNS\u670d\u52a1\uff08\u5728\u6b64\u60c5\u51b5\u4e0b\u662f\u8fd0\u884cCoreDNS\u7684\u670d\u52a1\u7684Cluster IP\uff0c\u4f8b\u5982\uff1a10.32.0.10\uff09\u3002<\/p>\n
      \u540d\u79f0\u89e3\u6790\u548c\u54cd\u5e94\uff1aCoreDNS\u63a5\u6536\u67e5\u8be2\uff0c\u5e76\u5c06\u8bf7\u6c42\u7684\u670d\u52a1\u540d\u79f0\u89e3\u6790\u4e3a\u76f8\u5e94\u7684IP\u5730\u5740\uff08\u670d\u52a1\u7684Cluster IP\uff09\u3002\u7136\u540e\uff0c\u5c06\u89e3\u6790\u7ed3\u679c\u8fd4\u56de\u7ed9Pod A\u3002<\/p>\n
      \u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u6d41\u91cf\u5c06\u6cbf\u7740\u660e\u786e\u7684\u8def\u5f84\u8fdb\u884c\u4f20\u8f93\uff0c\u5e76\u4e14\u54cd\u5e94\u5c06\u4ece\u671f\u671b\u7684\u6e90\uff08CoreDNS\u670d\u52a1\u7684IP\uff09\u8fd4\u56de\u3002<\/p>\n
      \u554f\u984c\u767c\u751f\u6642\u7684\u6d41\u91cf\u60c5\u6cc1\uff1a<\/h3>\n
        \n
      1. \n
          DNS\u67e5\u8be2\u7684\u5f00\u59cb\uff1a\u540c\u6837\uff0c\u4ecePod A\u53d1\u51faDNS\u67e5\u8be2\u3002<\/ol>\n<\/li>\n<\/ol>\n
          \u8bf7\u6c42\u8f6c\u53d1\uff1a\u67e5\u8be2\u88ab\u8f6c\u53d1\u5230CoreDNS\uff0c\u4f46\u51fa\u73b0\u4e86\u95ee\u9898\u3002<\/p>\n
          \u8def\u7531\u6545\u969c\uff1a\u54cd\u5e94\u5e94\u8be5\u8fd4\u56de\u5230Pod A\uff0c\u4f46\u7531\u4e8e\u7f51\u7edc\u914d\u7f6e\u4e0d\u6b63\u786e\uff0c\u54cd\u5e94\u6570\u636e\u5305\u7684\u6e90IP\u88ab\u91cd\u5199\uff08NAT\/Masquerading\u95ee\u9898\uff09\u3002\u7ed3\u679c\u662f\uff0cPod A\u6536\u5230\u7684\u54cd\u5e94\u4e0d\u662f\u6765\u81eaCoreDNS\u7684IP\uff0810.32.0.10\uff09\uff0c\u800c\u662f\u6765\u81ea\u53e6\u4e00\u4e2a\u610f\u5916\u7684\u5730\u5740\uff08\u4f8b\u5982\uff0c\u8282\u70b9\u7684IP 10.200.2.177\uff09\u3002<\/p>\n
          \u9519\u8bef\u53d1\u751f\uff1a\u7531\u4e8ePod A\u6ca1\u6709\u4ece\u9884\u671f\u7684\u6e90\u63a5\u6536\u5230\u54cd\u5e94\uff0c\u5b83\u4f1a\u5ffd\u7565\u6216\u5c06\u5176\u89c6\u4e3a\u9519\u8bef\u3002\u8fd9\u662f\u5bfc\u81f4”\u6765\u81ea\u610f\u5916\u6765\u6e90\u7684\u56de\u590d”\u9519\u8bef\u7684\u539f\u56e0\u3002<\/p>\n
          br_netfilter\u7684\u4f5c\u7528\u548c\u5f71\u54cd\uff1a<\/h3>\n
          br_netfilter\u6a21\u5757\u5c06Linux\u5185\u6838\u7684\u7f51\u7edc\u8fc7\u6ee4\u529f\u80fd\u5e94\u7528\u4e8e\u6865\u63a5\u8fde\u63a5\u7684\u6d41\u91cf\uff08\u4f8b\u5982Pod\u4e4b\u95f4\u7684\u901a\u4fe1\uff09\u3002\u8fd9\u610f\u5473\u7740\u5373\u4f7f\u6d41\u91cf\u6ca1\u6709\u901a\u8fc7\u7269\u7406\u7f51\u7edc\u63a5\u53e3\uff0cIP\u8868\uff08iptables\uff09\u89c4\u5219\u4e5f\u4f1a\u5e94\u7528\u4e8e\u6d41\u91cf\u3002<\/p>\n
            \n
          1. \n
              \u5982\u679c\u542f\u7528\u4e86br_netfilter\uff0c\u5219\u5c06\u5f3a\u5236\u6267\u884c\u6240\u671f\u671b\u7684\u64cd\u4f5c\uff1a\u6b63\u786e\u7684iptables\u89c4\u5219\u5c06\u88ab\u5e94\u7528\uff0c\u7279\u522b\u662f\u4f1a\u6b63\u786e\u6267\u884c\u6570\u636e\u5305\u6e90IP\u5730\u5740\u7684\u4f2a\u88c5\u3002\u8fd9\u5c06\u786e\u4fddDNS\u54cd\u5e94\u4fdd\u6301\u6b63\u786e\u7684\u6e90IP\u5730\u5740\uff08CoreDNS\u7684\u96c6\u7fa4IP\uff09\uff0c\u5e76\u4f7fPod A\u80fd\u591f\u63a5\u53d7\u54cd\u5e94\u3002<\/ol>\n<\/li>\n<\/ol>\n
              \u4fee\u590d\u610f\u5916\u7684\u8def\u7531\u95ee\u9898\uff1a\u901a\u8fc7\u5e94\u7528\u6b63\u786e\u7684\u8def\u7531\u548c\u4f2a\u88c5\u89c4\u5219\u6765\u4fee\u6b63\u4e0d\u6b63\u786e\u6e90\u5730\u5740\u7684\u54cd\u5e94\u3002\u8fd9\u5c06\u786e\u4fdd\u6570\u636e\u5305\u4ee5\u671f\u671b\u7684\u6e90\u5730\u5740\u53d1\u9001\u5230Pod A\uff0c\u5e76\u4f7f\u901a\u4fe1\u6b63\u5e38\u5b8c\u6210\u3002<\/p>\n
              \u603b\u7684\u6765\u8bf4\uff0c\u542f\u7528br_netfilter\u5bf9\u4e8e\u5bb9\u5668\u7f16\u6392\u7cfb\u7edf\u5982Kubernetes\u6765\u8bf4\uff0c\u662f\u786e\u4fdd\u7f51\u7edc\u901a\u4fe1\u7684\u4e00\u81f4\u6027\u81f3\u5173\u91cd\u8981\u7684\u3002\u901a\u8fc7\u8fd9\u6837\u505a\uff0c\u53ef\u4ee5\u786e\u4fdd\u9002\u5f53\u7684\u901a\u4fe1\u8def\u7531\u5728\u670d\u52a1\u4e4b\u95f4\u5f97\u4ee5\u4fdd\u8bc1\uff0c\u89e3\u51b3\u4e86\u610f\u5916\u7f51\u7edc\u6d41\u91cf\u7684\u95ee\u9898\u3002<\/p>\n
              \u603b\u4e4b<\/h2>\n
              Kubernetes\uff08k8s\uff09\u9700\u8981\u4f9d\u8d56\u4e8ebr_netfilter\u6a21\u5757\u6216\u5176\u7c7b\u4f3c\u529f\u80fd\uff0c\u4ee5\u786e\u4fdd\u5185\u90e8\u7f51\u7edc\u6b63\u5e38\u8fd0\u884c\u3002\u901a\u8fc7\u5b58\u5728\u8be5\u6a21\u5757\uff08\u6216\u5177\u6709\u76f8\u4f3c\u529f\u80fd\u7684\u5176\u4ed6\u673a\u5236\uff09\uff0cKubernetes\u80fd\u591f\u51c6\u786e\u63a7\u5236Pod\u4e4b\u95f4\u7684\u901a\u4fe1\u548c\u5176\u4ed6\u91cd\u8981\u7684\u7f51\u7edc\u64cd\u4f5c\u3002<\/p>\n
              br_netfilter\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\u5c24\u4e3a\u91cd\u8981\uff1a<\/p>\n
                \n
              1. \n
                  Pod\u95f4\u901a\u4fe1\uff1a\u5728Kubernetes\u73af\u5883\u4e2d\uff0c\u4e0d\u540cPod\u4e4b\u95f4\u7684\u6d41\u91cf\u901a\u5e38\u901a\u8fc7\u4f7f\u7528Linux\u6865\u8fdb\u884c\u8def\u7531\u3002\u5982\u679c\u6ca1\u6709br_netfilter\uff0c\u8fd9\u4e2a\u6d41\u91cf\u5c06\u7ed5\u8fc7iptables\u89c4\u5219\uff0c\u5bfc\u81f4\u65e0\u6cd5\u6b63\u786e\u5e94\u7528\u7f51\u7edc\u7b56\u7565\u3001NAT\u548c\u5176\u4ed6\u7f51\u7edc\u529f\u80fd\u3002<\/ol>\n<\/li>\n<\/ol>\n
                  \u7f51\u7edc\u7b56\u7565\u5e94\u7528\uff1aKubernetes\u4f7f\u7528\u7f51\u7edc\u7b56\u7565\u6765\u63a7\u5236Pod\u7ea7\u522b\u7684\u6d41\u91cf\u6d41\u52a8\u3002br_netfilter\u63d0\u4f9b\u4e86\u8def\u7531\u6765\u5b9e\u9645\u5e94\u7528\u8fd9\u4e9b\u7b56\u7565\u5230\u6d41\u91cf\u4e0a\uff0c\u4ee5\u786e\u4fdd\u5fc5\u8981\u7684\u5b89\u5168\u6027\u548c\u9694\u79bb\u3002<\/p>\n
                  \u670d\u52a1\u8def\u7531\u548c\u8d1f\u8f7d\u5747\u8861\uff1aKubernetes\u7684\u670d\u52a1\uff08\u7279\u522b\u662fClusterIP\u7c7b\u578b\uff09\u901a\u8fc7\u4f7f\u7528iptables\/NAT\u89c4\u5219\u5c06\u6d41\u91cf\u8def\u7531\u5230Pod\u4e0a\u3002\u8fd9\u4e9b\u89c4\u5219\u901a\u8fc7br_netfilter\u6a21\u5757\u5e94\u7528\u5230\u6865\u63a5\u8fde\u63a5\u7684\u6d41\u91cf\u4e0a\u6765\u5b9e\u73b0\u529f\u80fd\u3002<\/p>\n
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