{"id":528,"date":"2016-08-11T17:58:27","date_gmt":"2016-08-11T09:58:27","guid":{"rendered":"http:\/\/julyclyde.org\/?p=528"},"modified":"2016-08-11T17:58:27","modified_gmt":"2016-08-11T09:58:27","slug":"kube-proxy-proxy-modeiptables-%e4%b8%8e-rp_filter-%e5%86%b2%e7%aa%81","status":"publish","type":"post","link":"https:\/\/julyclyde.org\/?p=528","title":{"rendered":"kube-proxy –proxy-mode=iptables \u4e0e rp_filter \u51b2\u7a81"},"content":{"rendered":"

2015\u5e7412\u670816\u65e5\uff0c\u6731\u9e4f\u5b89\u88c5\u4e86\u65b0\u7248kubernetes master\u7248\u672c\uff08\u6bd41.1\u65b0\uff0c\u4e3a1.2alpha**\uff09\uff0c\u7136\u540e\u53d1\u73b0\uff0c\u8bbf\u95ee clusterIP:clusterPort \u4f1a\u53d1\u751f\u65e0\u6cd5\u8fde\u63a5\u7684\u6545\u969c\u3002<\/p>\n

\u4ece\u96c6\u7fa4\u5185Node\u4e0a\u8bbf\u95ee<\/h1>\n

\u5206\u522b\u5728Node rz-ep19\u548ccontainer\u91cc\u6267\u884ccurl\u8bbf\u95ee\uff0c\u53d1\u73b0container\u91cccurl\u53ef\u4ee5\u6210\u529f\u8bbf\u95ee\uff0c\u4f46Node\u4e0a\u4e00\u822c\u4e0d\u884c\uff08\u5076\u5c14\u6210\u529f\uff0c\u51e0\u7387\u5f88\u4f4e\uff09\u3002\u67e5\u770biptables\u89c4\u5219\uff0c\u53d1\u73b0\u65b0\u7248kube-proxy\u5df2\u7ecf\u4e0d\u518d\u5c06\u8bf7\u6c42REDIRECT\u5230\u672c\u673akube-proxy\u7aef\u53e3\uff0c\u800c\u662f\uff1a<\/p>\n

    \n
  1. \u5148\u628aPREROUTING\u3001OUTPUT\u65e0\u6761\u4ef6\u6307\u5411KUBE-SERVICES\u94fe\uff1b\u5982\u5339\u914d\u4e0d\u4e0aKUBE-SERVICES\u94fe\uff0c\u5219\u518d\u5c1d\u8bd5\u5339\u914d\u53d1\u7ed9docker0<\/li>\n
  2. \u5728KUBE-SERVICES\u94fe\u91cc\u5339\u914dclusterIP:clusterPort\u6761\u4ef6\uff0c\u7136\u540e\u53d1\u5230KUBE-SVC-***\u94fe<\/li>\n
  3. \u5728KUBE-SVC-***\u94fe\u4e2d\uff0c\u7528-m statistic –mode random –probability\u8fd9\u6837\u7684\u6761\u4ef6\u5c06\u6d41\u91cf\u6309\u7b49\u6bd4\u4f8b\u5206\u7ed9\u591a\u4e2aKUBE-SEP-***\u94fe<\/li>\n
  4. \u7136\u540e\u518d\u5728KUBE-SEP-***\u94fe\u4e2d\uff0c\u5c06\u6570\u636e\u5305DNAT\u7ed9endpoint<\/li>\n<\/ol>\n

    \u4e3a\u4e86\u51cf\u5c11\u5e72\u6270\uff0c\u6211\u4eec\u7f29\u51cf\u4e86kube-system\/elasticsearch-logging 10.16.59.73:9200\u670d\u52a1\u7684\u89c4\u6a21\uff0c\u5230\u53ea\u6709\u4e00\u4e2aendpoint 172.16.86.48:9200\u8fd0\u884c\u5728rz-ep10\u4e0a\uff1brz-ep19 10.16.49.16\u4f5c\u4e3a\u8fd0\u884ccurl\u7684\u5ba2\u6237\u7aef<\/p>\n

      \n
    • \u5728rz-ep19\u7684flannel\u63a5\u53e3\u4e0a\u6293\u5305\uff0c\u6293\u5230\u4e86 10.16.49.16->172.17.86.48\u7684TCP SYN\uff0c\u4f46\u6ca1\u6709\u6536\u5230\u56de\u5e94\u3002<\/li>\n
    • \u5728rz-ep10\uff08endpoint Pod\u6240\u5728\u7684Node\uff09\u7684flannel\u63a5\u53e3\u4e0a\u6293\u5305\uff0c\u6293\u5230\u4e86\u548c\u4e0a\u8ff0\u76f8\u540c\u7684\u5305\uff0c\u4e5f\u6ca1\u6709\u6536\u5230\u56de\u5e94\u3002<\/li>\n
    • \u5728rz-ep10\u7684docker0\u63a5\u53e3\u4e0a\u6293\u5305\uff0c\u6ca1\u6709\u6293\u5230<\/li>\n<\/ul>\n

      \u7531\u6b64\u5224\u65ad\uff0crz-ep10\u7684\u5185\u6838\u5728\u8f6c\u53d1\u65f6\u4e3b\u52a8\u4e22\u5f03\u6389\u4e86 10.16.49.16->172.17.86.48\u7684SYN\uff0c\u4ee5\u81f3\u4e8e\u65e0\u6cd5\u5efa\u7acbTCP\u8fde\u63a5\u3002\u67e5\u770b\/proc\/sys\/net\/ipv4\/conf\/{all,flannel.7890}\/rp_filter\uff0c\u53d1\u73b0flannel.7890\/rp_filter\u5185\u5bb9\u4e3a1\uff0c\u5373\u5728\u6b64\u7f51\u5361\u4e0a\u6267\u884c\u201c\u6839\u636e\u56de\u6eaf\u8def\u7531\u68c0\u67e5\u6570\u636e\u5305\u662f\u5426\u4e3a\u4f2a\u9020\u201d\u7684\u68c0\u67e5\u3002\u56e0\u4e3a\u6e90IP 10.16.49.16\u5728rz-ep10\u770b\u6765\u7406\u5e94\u51fa\u73b0\u81eaeth0\u800c\u975eflannel.7890\u63a5\u53e3\uff0c\u6240\u4ee5\u88ab\u5224\u5b9a\u4e3a\u5047\u9020\u5305\uff0c\u4e22\u5f03\u3002<\/p>\n

      \u5c06\u6b64\u53c2\u6570\u6539\u4e3a0\uff0c\u518d\u53bbdocker0\u4e0a\u6293\u5305\uff0c\u53ef\u4ee5\u6536\u5230172.17.86.48\u53d1\u56de10.16.49.16 SYNACK\u5305\uff1b\u4f46rz-ep19\u4e0acurl\u4ecd\u663e\u793a\u65e0\u6cd5\u5efa\u7acb\u8fde\u63a5\u3002<\/p>\n

      \u5728rz-ep10\u7684\u89d2\u5ea6\u8003\u8651\uff0c\u8fd9\u4e2a172.17.86.48->10.16.49.16\u7684\u5305\u5e94\u8be5\u4eceeth0\u53d1\u51fa\uff0c\u4e5f\u5c31\u662f\u5728rz-ep19\u7684eth0\u4e0a\u6536\u5230\u3002\u800c\u5728rz-ep19\u7684\u89d2\u5ea6\u8003\u8651\uff0c\u6e90IP 172.16.86.48\u4e0d\u5e94\u6765\u81eaeth0\uff0c\u4e5f\u4f1a\u88abrp_filter\u53c2\u6570\u5f71\u54cd\uff0c\u4e22\u5f03\u6389\uff0c\u6240\u4ee5\u65e0\u6cd5\u5efa\u7acb\u8fde\u63a5\u3002\u628arz-ep19\u7684eth0\/rp_filter\u53c2\u6570\u6539\u4e3a0\uff0c\u7ec8\u4e8e\u53ef\u4ee5\u6b63\u5e38\u8bbf\u95ee\u4e86\u3002<\/p>\n

       <\/p>\n

      \"plantuml9098040596798137974\"<\/p>\n

       <\/p>\n

      \u4ece\u96c6\u7fa4\u5916\u8bbf\u95ee<\/h1>\n

      \u4ece\u529e\u516c\u533a\u6211\u7684\u7b14\u8bb0\u672c\u7535\u8111 172.30.26.169 \u8bbf\u95ee 10.16.59.67:80 \u670d\u52a1\uff0c\u8be5\u865aIP\u88ab\u624b\u5de5\u7ed1\u5728rz-ep01\u4e0a\uff0cping\u53ef\u4ee5\u901a\uff0c\u4f46\u8bbf\u95ee\u4e0d\u901a\u3002<\/p>\n

      \u5728\u7b14\u8bb0\u672c\u7535\u8111\u4e0a\u6293\u5305\uff0c\u53d1\u73b0\u53ea\u6709\u4ece\u672c\u673a\u53d1\u5f80clusterIP\u7684SYN\u5305\uff0c\u6ca1\u6709\u8fd4\u56de\uff0c\u6240\u4ee5\u65e0\u6cd5\u5efa\u7acbTCP\u8fde\u63a5\u3002<\/p>\n

      \u6539\u4ee5Pod IP\u4e3a\u8fc7\u6ee4\u6761\u4ef6\uff0c\u53d1\u73b0Pod IP\u76f4\u63a5\u53d1\u56de SYN_ACK\u7ed9\u6211\u7684\u7b14\u8bb0\u672c\u7535\u8111\uff0c\u4f46\u56e0\u4e3a\u7b14\u8bb0\u672c\u7535\u8111\u8fd9\u8fb9\u6ca1\u6709\u53d1\u8d77\u5bf9Pod\u7684SYN\uff0c\u6240\u4ee5\u76f4\u63a5\u56de\u590dRST\u7ed9Pod\u4e86\u3002<\/p>\n

      \u6539\u7528iptables\u6a21\u5f0f\u4e4b\u540e\uff0c\u7531\u4e8e\u4e0d\u5bf9\u79f0\u8def\u5f84\u7684\u95ee\u9898\uff0c\u8fd9\u79cd\u8bbf\u95ee\u57fa\u672c\u4e0a\u65e0\u6cd5\u4ee5\u4ee5\u524d\u201c\u628aclusterIP\u7ed1\u5728Node\u4e0a\u201d\u7684\u505a\u6cd5\u5b9e\u73b0<\/p>\n","protected":false},"excerpt":{"rendered":"

      2015\u5e7412\u670816\u65e5\uff0c\u6731\u9e4f\u5b89\u88c5\u4e86\u65b0\u7248kubernetes master\u7248\u672c\uff08\u6bd41.1\u65b0\uff0c\u4e3a1.2alpha**\uff09\uff0c\u7136\u540e\u53d1\u73b0\uff0c\u8bbf\u95ee clusterIP:clusterPort \u4f1a\u53d1\u751f\u65e0\u6cd5\u8fde\u63a5\u7684\u6545\u969c\u3002 \u4ece\u96c6\u7fa4\u5185Node\u4e0a\u8bbf\u95ee \u5206\u522b\u5728Node rz-ep19\u548ccontainer\u91cc\u6267\u884ccurl\u8bbf\u95ee\uff0c\u53d1\u73b0container\u91cccurl\u53ef\u4ee5\u6210\u529f\u8bbf\u95ee\uff0c\u4f46Node\u4e0a\u4e00\u822c\u4e0d\u884c\uff08\u5076\u5c14\u6210\u529f\uff0c\u51e0\u7387\u5f88\u4f4e\uff09\u3002\u67e5\u770biptables\u89c4\u5219\uff0c\u53d1\u73b0\u65b0\u7248kube-proxy\u5df2\u7ecf\u4e0d\u518d\u5c06\u8bf7\u6c42REDIRECT\u5230\u672c\u673akube-proxy\u7aef\u53e3\uff0c\u800c\u662f\uff1a \u5148\u628aPREROUTING\u3001OUTPUT\u65e0\u6761\u4ef6\u6307\u5411KUBE-SERVICES\u94fe\uff1b\u5982\u5339\u914d\u4e0d\u4e0aKUBE-SERVICES\u94fe\uff0c\u5219\u518d\u5c1d\u8bd5\u5339\u914d\u53d1\u7ed9docker0 \u5728KUBE-SERVICES\u94fe\u91cc\u5339\u914dclusterIP:clusterPort\u6761\u4ef6\uff0c\u7136\u540e\u53d1\u5230KUBE-SVC-***\u94fe \u5728KUBE-SVC-***\u94fe\u4e2d\uff0c\u7528-m statistic –mode random –probability\u8fd9\u6837\u7684\u6761\u4ef6\u5c06\u6d41\u91cf\u6309\u7b49\u6bd4\u4f8b\u5206\u7ed9\u591a\u4e2aKUBE-SEP-***\u94fe \u7136\u540e\u518d\u5728KUBE-SEP-***\u94fe\u4e2d\uff0c\u5c06\u6570\u636e\u5305DNAT\u7ed9endpoint \u4e3a\u4e86\u51cf\u5c11\u5e72\u6270\uff0c\u6211\u4eec\u7f29\u51cf\u4e86kube-system\/elasticsearch-logging 10.16.59.73:9200\u670d\u52a1\u7684\u89c4\u6a21\uff0c\u5230\u53ea\u6709\u4e00\u4e2aendpoint 172.16.86.48:9200\u8fd0\u884c\u5728rz-ep10\u4e0a\uff1brz-ep19 10.16.49.16\u4f5c\u4e3a\u8fd0\u884ccurl\u7684\u5ba2\u6237\u7aef \u5728rz-ep19\u7684flannel\u63a5\u53e3\u4e0a\u6293\u5305\uff0c\u6293\u5230\u4e86 10.16.49.16->172.17.86.48\u7684TCP SYN\uff0c\u4f46\u6ca1\u6709\u6536\u5230\u56de\u5e94\u3002 \u5728rz-ep10\uff08endpoint Pod\u6240\u5728\u7684Node\uff09\u7684flannel\u63a5\u53e3\u4e0a\u6293\u5305\uff0c\u6293\u5230\u4e86\u548c\u4e0a\u8ff0\u76f8\u540c\u7684\u5305\uff0c\u4e5f\u6ca1\u6709\u6536\u5230\u56de\u5e94\u3002 \u5728rz-ep10\u7684docker0\u63a5\u53e3\u4e0a\u6293\u5305\uff0c\u6ca1\u6709\u6293\u5230 \u7531\u6b64\u5224\u65ad\uff0crz-ep10\u7684\u5185\u6838\u5728\u8f6c\u53d1\u65f6\u4e3b\u52a8\u4e22\u5f03\u6389\u4e86 10.16.49.16->172.17.86.48\u7684SYN\uff0c\u4ee5\u81f3\u4e8e\u65e0\u6cd5\u5efa\u7acbTCP\u8fde\u63a5\u3002\u67e5\u770b\/proc\/sys\/net\/ipv4\/conf\/{all,flannel.7890}\/rp_filter\uff0c\u53d1\u73b0flannel.7890\/rp_filter\u5185\u5bb9\u4e3a1\uff0c\u5373\u5728\u6b64\u7f51\u5361\u4e0a\u6267\u884c\u201c\u6839\u636e\u56de\u6eaf\u8def\u7531\u68c0\u67e5\u6570\u636e\u5305\u662f\u5426\u4e3a\u4f2a\u9020\u201d\u7684\u68c0\u67e5\u3002\u56e0\u4e3a\u6e90IP 10.16.49.16\u5728rz-ep10\u770b\u6765\u7406\u5e94\u51fa\u73b0\u81eaeth0\u800c\u975eflannel.7890\u63a5\u53e3\uff0c\u6240\u4ee5\u88ab\u5224\u5b9a\u4e3a\u5047\u9020\u5305\uff0c\u4e22\u5f03\u3002 \u5c06\u6b64\u53c2\u6570\u6539\u4e3a0\uff0c\u518d\u53bbdocker0\u4e0a\u6293\u5305\uff0c\u53ef\u4ee5\u6536\u5230172.17.86.48\u53d1\u56de10.16.49.16 SYNACK\u5305\uff1b\u4f46rz-ep19\u4e0acurl\u4ecd\u663e\u793a\u65e0\u6cd5\u5efa\u7acb\u8fde\u63a5\u3002 \u5728rz-ep10\u7684\u89d2\u5ea6\u8003\u8651\uff0c\u8fd9\u4e2a172.17.86.48->10.16.49.16\u7684\u5305\u5e94\u8be5\u4eceeth0\u53d1\u51fa\uff0c\u4e5f\u5c31\u662f\u5728rz-ep19\u7684eth0\u4e0a\u6536\u5230\u3002\u800c\u5728rz-ep19\u7684\u89d2\u5ea6\u8003\u8651\uff0c\u6e90IP 172.16.86.48\u4e0d\u5e94\u6765\u81eaeth0\uff0c\u4e5f\u4f1a\u88abrp_filter\u53c2\u6570\u5f71\u54cd\uff0c\u4e22\u5f03\u6389\uff0c\u6240\u4ee5\u65e0\u6cd5\u5efa\u7acb\u8fde\u63a5\u3002\u628arz-ep19\u7684eth0\/rp_filter\u53c2\u6570\u6539\u4e3a0\uff0c\u7ec8\u4e8e\u53ef\u4ee5\u6b63\u5e38\u8bbf\u95ee\u4e86\u3002     \u4ece\u96c6\u7fa4\u5916\u8bbf\u95ee \u4ece\u529e\u516c\u533a\u6211\u7684\u7b14\u8bb0\u672c\u7535\u8111 172.30.26.169 \u8bbf\u95ee 10.16.59.67:80 \u670d\u52a1\uff0c\u8be5\u865aIP\u88ab\u624b\u5de5\u7ed1\u5728rz-ep01\u4e0a\uff0cping\u53ef\u4ee5\u901a\uff0c\u4f46\u8bbf\u95ee\u4e0d\u901a\u3002 … Continue reading →<\/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":[1],"tags":[65],"class_list":["post-528","post","type-post","status-publish","format-standard","hentry","category-default","tag-kubernetes"],"_links":{"self":[{"href":"https:\/\/julyclyde.org\/index.php?rest_route=\/wp\/v2\/posts\/528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/julyclyde.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/julyclyde.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/julyclyde.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/julyclyde.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=528"}],"version-history":[{"count":0,"href":"https:\/\/julyclyde.org\/index.php?rest_route=\/wp\/v2\/posts\/528\/revisions"}],"wp:attachment":[{"href":"https:\/\/julyclyde.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/julyclyde.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/julyclyde.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}