{"id":35607,"date":"2023-04-23T16:40:37","date_gmt":"2023-03-18T12:41:37","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e9%80%9a%e8%bf%87-kube-proxy-%e5%ae%9e%e7%8e%b0%e4%ba%86%e8%a7%a3-iptables-%ef%bd%9e%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86%e3%80%82kube-proxy-%e7%9a%84%e5%9f%ba%e7%a1%80%ef%bd%9e%e3%80%82\/"},"modified":"2024-04-30T00:55:05","modified_gmt":"2024-04-29T16:55:05","slug":"%e9%80%9a%e8%bf%87-kube-proxy-%e5%ae%9e%e7%8e%b0%e4%ba%86%e8%a7%a3-iptables-%ef%bd%9e%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86%e3%80%82kube-proxy-%e7%9a%84%e5%9f%ba%e7%a1%80%ef%bd%9e%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e9%80%9a%e8%bf%87-kube-proxy-%e5%ae%9e%e7%8e%b0%e4%ba%86%e8%a7%a3-iptables-%ef%bd%9e%e7%ac%ac%e4%b8%80%e9%83%a8%e5%88%86%e3%80%82kube-proxy-%e7%9a%84%e5%9f%ba%e7%a1%80%ef%bd%9e%e3%80%82\/","title":{"rendered":"\u901a\u8fc7 kube-proxy \u5b9e\u73b0\u4e86\u89e3 iptables \uff5e\u7b2c\u4e00\u90e8\u5206\u3002kube-proxy \u7684\u57fa\u7840\uff5e"},"content":{"rendered":"

\u9996\u5148<\/h2>\n

\u8fd9\u7bc7\u6587\u7ae0\u662fCyberAgent\u76842023\u5c4a\u6bd5\u4e1a\u751f\u5185\u5b9a\u8005Advent Calendar\u7684\u7b2c\u516d\u7bc7\u6587\u7ae0\u3002<\/p>\n

\u5927\u5bb6\u90fd\u77e5\u9053\u7684\u5bb9\u5668\u5e73\u53f0 Kubernetes \u662f\u7531\u591a\u79cd\u7ec4\u4ef6\u7ec4\u5408\u800c\u6210\u7684\uff0c\u5176\u4e2d\u4e00\u4e2a\u7ec4\u4ef6\u662f\u7528\u4e8e\u63a7\u5236\u5de5\u4f5c\u8282\u70b9\u7f51\u7edc\u7684 “kube-proxy”\u3002kube-proxy \u6709\u51e0\u79cd\u5de5\u4f5c\u6a21\u5f0f\u6765\u63a7\u5236\u5de5\u4f5c\u8282\u70b9\u5185\u7684\u6d41\u91cf\uff0c\u672c\u6b21\u6211\u4eec\u5c06\u8ffd\u8e2a\u5e76\u4e86\u89e3\u5176\u4e2d\u4e00\u79cd\u4f7f\u7528 Linux \u7f51\u7edc\u529f\u80fd\u7684 “iptables” \u5de5\u4f5c\u6a21\u5f0f\u7684\u884c\u4e3a\u3002<\/p>\n

kube-proxy \u662f\u4ec0\u4e48\uff1f<\/h2>\n

kube-proxy \u662f\u5728\u6bcf\u4e2a\u5de5\u4f5c\u8282\u70b9\u4e0a\u8fd0\u884c\u7684\u8fdb\u7a0b\uff0c\u6839\u636e\u521b\u5efa\u7684 Service \u8d44\u6e90\u7b49\u6765\u8fdb\u884c\u5de5\u4f5c\u8282\u70b9\u5185\u7684\u7f51\u7edc\u8bbe\u7f6e\uff0c\u4ee5\u5b9e\u73b0\u4e0e Pod \u7684\u901a\u4fe1\u3002<\/p>\n

\"Screenshot<\/div>\n

\u5177\u4f53\u8bbe\u7f6e\u7f51\u7edc\u7684\u65b9\u6cd5\u6709\u4e09\u79cd\uff0c\u5206\u522b\u662f\u201c\u7528\u6237\u7a7a\u95f4\u4ee3\u7406\u6a21\u5f0f\u201d\u3001\u201ciptables\u4ee3\u7406\u6a21\u5f0f\u201d\u548c\u201cIPVS\u4ee3\u7406\u6a21\u5f0f\u201d\u3002\u672c\u6b21\u5c06\u8ffd\u8e2a\u4f7f\u7528iptables\u4ee3\u7406\u6a21\u5f0f\u7684\u5b9e\u65bd\u3002<\/p>\n

iptables \u662f\u4e00\u79cd\u7528\u4e8e\u5728 Linux \u64cd\u4f5c\u7cfb\u7edf\u4e0a\u8bbe\u7f6e\u548c\u7ba1\u7406\u9632\u706b\u5899\u89c4\u5219\u7684\u8f6f\u4ef6\u3002<\/h2>\n

iptables\u662fLinux\u7684\u7f51\u7edc\u529f\u80fd\uff0c\u53ef\u4ee5\u901a\u8fc7\u547d\u4ee4\u5728\u5185\u6838\u5c42\u63a7\u5236\u6570\u636e\u5305\u8fc7\u6ee4\u548c\u8def\u7531\u7b49\u529f\u80fd\u3002iptables\u7684\u5b9e\u73b0\u662f\u4e00\u4e2a\u540d\u4e3aNetfilter\u7684Linux\u6a21\u5757\uff0c\u5e76\u4e14\u5b9e\u9645\u4e0aiptables\u5c31\u662f\u7528\u4e8e\u64cd\u4f5cNetfilter\u7684\u63a5\u53e3\u3002[3]<\/p>\n

\u7b80\u5355\u6765\u8bf4\uff0c\u5982\u679c\u8981\u963b\u6b62\u6765\u81ea\u7279\u5b9aIP\u5730\u5740192.0.2.1\u7684\u901a\u4fe1\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\u6765\u5b9e\u73b0\u3002<\/p>\n

iptables -A<\/span> INPUT -s<\/span> 192.0.2.1 -j<\/span> DROP\r\n<\/code><\/pre>\n
\u53e6\u5916\uff0c\u5982\u679c\u53ea\u5141\u8bb8SSH\u901a\u4fe1\uff0c\u5219\u53ef\u4ee5\u5982\u4e0b\u8bbe\u7f6e\u3002<\/p>\n
iptables -A<\/span> INPUT -p<\/span> tcp -m<\/span> tcp --dport<\/span> 22 -j<\/span> ACCEPT\r\n<\/code><\/pre>\n
\u6b64\u5916\uff0ciptables \u8fd8\u53ef\u4ee5\u901a\u8fc7\u89c4\u5219\u4fee\u6539\u6570\u636e\u5305\u7684\u5185\u5bb9\uff0c\u4f8b\u5982\uff0c\u5982\u679c\u8981\u66f4\u6539\u7279\u5b9a\u6570\u636e\u5305\u7684\u76ee\u6807\u5730\u5740\uff08\u76ee\u6807\u7f51\u7edc\u5730\u5740\u8f6c\u6362\uff09\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u4ee5\u4e0b\u89c4\u5219\u3002<\/p>\n
iptables -A<\/span> INPUT -d<\/span> 192.0.2.1\/32 -p<\/span> tcp -m<\/span> tcp -j<\/span> DNAT --to-destination<\/span> 192.0.2.2:80\r\n<\/code><\/pre>\n
iptables\u4ee3\u7406\u6a21\u5f0f\u7684kube-proxy\u6839\u636eService\u8d44\u6e90\u7684\u72b6\u6001\uff0c\u5728\u6bcf\u4e2a\u5de5\u4f5c\u8282\u70b9\u4e0a\u6267\u884ciptables\u547d\u4ee4\uff0c\u5c06\u6d41\u5411Service IP\u5730\u5740\u7684\u6d41\u91cf\u91cd\u5b9a\u5411\u5230\u4e0e\u8be5Service\u76f8\u5173\u8054\u7684Pod\u3002<\/p>\n
Kube-proxy\u7684\u5b9e\u73b0<\/h2>\n
\u5b9e\u65bd\u7684\u6982\u8981<\/h3>\n
\u8fd9\u91cc\u6211\u4eec\u8981\u786e\u8ba4 kube-proxy \u7684\u5b9e\u73b0\u3002kube-proxy \u4e0e\u5176\u4ed6 Kubernetes \u7ec4\u4ef6\u4e00\u6837\uff0c\u662f\u7528 Go \u7f16\u5199\u7684\uff0c\u5176\u6e90\u4ee3\u7801\u5b58\u653e\u5728 https:\/\/github.com\/kubernetes\/kubernetes \u7684\u4ee3\u7801\u5e93\u4e2d\u3002\u6211\u4eec\u5c06\u91cd\u70b9\u5173\u6ce8 v1.28.4 \u7684\u5b9e\u73b0\u3002<\/p>\n
\u5728\u8fdb\u5165\u5177\u4f53\u5b9e\u65bd\u4e4b\u524d\uff0c\u8ba9\u6211\u4eec\u5148\u786e\u8ba4kube-proxy\u7684\u5b9e\u65bd\u6982\u8981\u3002\u5c06\u5176\u7ed8\u5236\u6210\u56fe\u5f62\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
\"Screenshot<\/div>\n
kube-proxy\u7684\u5b9e\u4f53\u662f\u4e00\u4e2a\u540d\u4e3aProxyServer\u7684\u7ed3\u6784\u4f53\uff0c\u5b83\u62e5\u6709\u4e00\u4e9b\u5176\u4ed6\u7ed3\u6784\u4f53\uff0c\u5982Client\u548cProxier\uff08\u8fd8\u6709\u5176\u4ed6\u7ed3\u6784\u4f53\u7701\u7565\u4e0d\u5199\uff09\u3002<\/p>\n
ProxyServer\u901a\u8fc7Client\u548ckube-apiserver\u8fdb\u884c\u6301\u7eed\u76d1\u89c6Service\u548cEndpointSlice\u7b49\u8d44\u6e90\u3002\u5f53\u8fd9\u4e9b\u8d44\u6e90\u88ab\u521b\u5efa\u6216\u4fee\u6539\u65f6\uff0cProxyServer\u5c06\u68c0\u6d4b\u5230\u5e76\u6267\u884cProxier\u7684syncProxyRules()\u51fd\u6570\u4ee5\u540c\u6b65\u8d44\u6e90\u72b6\u6001\u548c\u5de5\u4f5c\u8282\u70b9\u7684iptables\u89c4\u5219\u3002\u53e6\u5916\uff0cProxier\u5728\u542f\u52a8\u65f6\u6267\u884csyncLoop()\u51fd\u6570\uff0c\u5373\u4f7f\u8d44\u6e90\u6ca1\u6709\u53d1\u751f\u53d8\u5316\uff0c\u4e5f\u4f1a\u5b9a\u671f\u6267\u884csyncProxyRules()\u51fd\u6570\u4ee5\u8fdb\u884c\u8d44\u6e90\u72b6\u6001\u548ciptables\u89c4\u5219\u7684\u540c\u6b65\u3002<\/p>\n
ProxyServer\u4e2d\u7684Proxier\u662f\u7531proxy.Provider\u63a5\u53e3\u5b9a\u4e49\u7684\uff0c\u8be5\u63a5\u53e3\u5728https:\/\/github.com\/kubernetes\/kubernetes\/blob\/v1.28.4\/pkg\/proxy\/types.go#L30\u4e2d\u5b9a\u4e49\u3002\u5b83\u8fd8\u5177\u6709config.ServiceHandler\u3001config.EndpointSliceHandler\u63a5\u53e3\u6765\u5904\u7406Service\/EndpointSlice\u8d44\u6e90\u7684\u53d8\u66f4\uff0c\u4ee5\u53casyncProxyRules()\u7684\u5305\u88c5\u5668sync()\u548c\u5b9a\u671f\u6267\u884csync()\u7684syncLoop()\u3002<\/p>\n
\/\/ #L30<\/span>\r\n\r\ntype<\/span> Provider<\/span> interface<\/span> {<\/span>\r\n\tconfig<\/span>.<\/span>EndpointSliceHandler<\/span>\r\n\tconfig<\/span>.<\/span>ServiceHandler<\/span>\r\n\tconfig<\/span>.<\/span>NodeHandler<\/span>\r\n\r\n\t\/\/ Sync immediately synchronizes the Provider's current state to proxy rules.<\/span>\r\n\tSync<\/span>()<\/span>\r\n\t\/\/ SyncLoop runs periodic work.<\/span>\r\n\t\/\/ This is expected to run as a goroutine or as the main loop of the app.<\/span>\r\n\t\/\/ It does not return.<\/span>\r\n\tSyncLoop<\/span>()<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
kube-proxy\u7684\u5de5\u4f5c\u6a21\u5f0f\u4e0d\u540c\uff0cProxier\u7684\u5b9e\u73b0\u4e5f\u4f1a\u6709\u6240\u4e0d\u540c\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u672c\u6b21\u8ba8\u8bba\u7684iptables\u4ee3\u7406\u6a21\u5f0f\uff0chttps:\/\/github.com\/kubernetes\/kubernetes\/blob\/v1.28.4\/pkg\/proxy\/iptables\/proxier.go \u662fProxier\u7684\u5b9e\u73b0\u3002<\/p>\n
\u5165\u53e3<\/h3>\n
\u8ba9\u6211\u4eec\u4ece\u5165\u53e3\u70b9\u5f00\u59cb\u8ffd\u8e2a kube-proxy \u7684\u5b9e\u73b0\u3002<\/p>\n
kube-proxy\u7684\u5165\u53e3\u70b9\u4f4d\u4e8ehttps:\/\/github.com\/kubernetes\/kubernetes\/blob\/v1.28.4\/cmd\/kube-proxy\/proxy.go\uff0c\u5e76\u4e14\u5728\u8fd9\u91cc\u53ea\u662f\u521b\u5efa\u4e86\u4e00\u4e2acobra.Command\uff0c\u5e76\u8c03\u7528Run()\u65b9\u6cd5\u3002<\/p>\n
func<\/span> main<\/span>()<\/span> {<\/span>\r\n\tcommand<\/span> :=<\/span> app<\/span>.<\/span>NewProxyCommand<\/span>()<\/span>\r\n\tcode<\/span> :=<\/span> cli<\/span>.<\/span>Run<\/span>(<\/span>command<\/span>)<\/span>\r\n\tos<\/span>.<\/span>Exit<\/span>(<\/span>code<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u521b\u5efa\u5e76\u542f\u52a8ProxyServer<\/h3>\n
\u5728\u5165\u53e3\u70b9\u521b\u5efa\u7684 cobra.Command \u4e2d\u6ce8\u518c\u4e86 ProxyServer \u7684\u521b\u5efa\u8fc7\u7a0b\uff0c\u5176\u5b9e\u73b0\u5728 https:\/\/github.com\/kubernetes\/kubernetes\/blob\/v1.28.4\/cmd\/kube-proxy\/app\/server.go#L358 \u4e2d\u901a\u8fc7 newProxyServer() \u521b\u5efa ProxyServer\uff0c\u6700\u540e\u901a\u8fc7\u6267\u884c o.runLoop() \u6765\u542f\u52a8\u521b\u5efa\u7684 ProxyServer\u3002<\/p>\n
\/\/ #L358<\/span>\r\n\r\n\/\/ Run runs the specified ProxyServer.<\/span>\r\nfunc<\/span> (<\/span>o<\/span> *<\/span>Options<\/span>)<\/span> Run<\/span>()<\/span> error<\/span> {<\/span>\r\n\tdefer<\/span> close<\/span>(<\/span>o<\/span>.<\/span>errCh<\/span>)<\/span>\r\n\tif<\/span> len<\/span>(<\/span>o<\/span>.<\/span>WriteConfigTo<\/span>)<\/span> ><\/span> 0<\/span> {<\/span>\r\n\t\treturn<\/span> o<\/span>.<\/span>writeConfigFile<\/span>()<\/span>\r\n\t}<\/span>\r\n\r\n\terr<\/span> :=<\/span> platformCleanup<\/span>(<\/span>o<\/span>.<\/span>config<\/span>.<\/span>Mode<\/span>,<\/span> o<\/span>.<\/span>CleanupAndExit<\/span>)<\/span>\r\n\tif<\/span> o<\/span>.<\/span>CleanupAndExit<\/span> {<\/span>\r\n\t\treturn<\/span> err<\/span>\r\n\t}<\/span>\r\n\t\/\/ We ignore err otherwise; the cleanup is best-effort, and the backends will have<\/span>\r\n\t\/\/ logged messages if they failed in interesting ways.<\/span>\r\n\r\n\tproxyServer<\/span>,<\/span> err<\/span> :=<\/span> newProxyServer<\/span>(<\/span>o<\/span>.<\/span>config<\/span>,<\/span> o<\/span>.<\/span>master<\/span>,<\/span> o<\/span>.<\/span>InitAndExit<\/span>)<\/span>\r\n\tif<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n\t\treturn<\/span> err<\/span>\r\n\t}<\/span>\r\n\tif<\/span> o<\/span>.<\/span>InitAndExit<\/span> {<\/span>\r\n\t\treturn<\/span> nil<\/span>\r\n\t}<\/span>\r\n\r\n\to<\/span>.<\/span>proxyServer<\/span> =<\/span> proxyServer<\/span>\r\n\treturn<\/span> o<\/span>.<\/span>runLoop<\/span>()<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\/\/ #L378<\/span>\r\n\r\n\/\/ runLoop will watch on the update change of the proxy server's configuration file.<\/span>\r\n\/\/ Return an error when updated<\/span>\r\nfunc<\/span> (<\/span>o<\/span> *<\/span>Options<\/span>)<\/span> runLoop<\/span>()<\/span> error<\/span> {<\/span>\r\n\tif<\/span> o<\/span>.<\/span>watcher<\/span> !=<\/span> nil<\/span> {<\/span>\r\n\t\to<\/span>.<\/span>watcher<\/span>.<\/span>Run<\/span>()<\/span>\r\n\t}<\/span>\r\n\r\n\t\/\/ run the proxy in goroutine<\/span>\r\n\tgo<\/span> func<\/span>()<\/span> {<\/span>\r\n\t\terr<\/span> :=<\/span> o<\/span>.<\/span>proxyServer<\/span>.<\/span>Run<\/span>()<\/span>\r\n\t\to<\/span>.<\/span>errCh<\/span> <-<\/span> err<\/span>\r\n\t}()<\/span>\r\n\r\n\tfor<\/span> {<\/span>\r\n\t\terr<\/span> :=<\/span> <-<\/span>o<\/span>.<\/span>errCh<\/span>\r\n\t\tif<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n\t\t\treturn<\/span> err<\/span>\r\n\t\t}<\/span>\r\n\t}<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5728newProxyServer\uff08\uff09\u51fd\u6570\u4e2d\uff0c\u901a\u8fc7kube-apiserver\u521b\u5efaClient\u4ee5\u76d1\u89c6Service\u8d44\u6e90\u7b49\uff0c\u5e76\u901a\u8fc7createClient\uff08\uff09\u548ccreateProxier\uff08\uff09\u521b\u5efaProxier\u7ed3\u6784\u6765\u8fdb\u884c\u5b9e\u9645\u7684\u7f51\u7edc\u8bbe\u7f6e\u3002<\/p>\n
\/\/ #L581<\/span>\r\n\r\n\/\/ newProxyServer creates a ProxyServer based on the given config<\/span>\r\nfunc<\/span> newProxyServer<\/span>(<\/span>config<\/span> *<\/span>kubeproxyconfig<\/span>.<\/span>KubeProxyConfiguration<\/span>,<\/span> master<\/span> string<\/span>,<\/span> initOnly<\/span> bool<\/span>)<\/span> (<\/span>*<\/span>ProxyServer<\/span>,<\/span> error<\/span>)<\/span> {<\/span>\r\n\ts<\/span> :=<\/span> &<\/span>ProxyServer<\/span>{<\/span>Config<\/span>:<\/span> config<\/span>}<\/span>\r\n\r\n    \/\/ (\u4e2d\u7565)<\/span>\r\n\r\n\ts<\/span>.<\/span>Client<\/span>,<\/span> err<\/span> =<\/span> createClient<\/span>(<\/span>config<\/span>.<\/span>ClientConnection<\/span>,<\/span> master<\/span>)<\/span>\r\n\tif<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n\t\treturn<\/span> nil<\/span>,<\/span> err<\/span>\r\n\t}<\/span>\r\n\r\n\t\/\/ (\u4e2d\u7565)<\/span>\r\n\r\n\ts<\/span>.<\/span>Proxier<\/span>,<\/span> err<\/span> =<\/span> s<\/span>.<\/span>createProxier<\/span>(<\/span>config<\/span>,<\/span> dualStackSupported<\/span>,<\/span> initOnly<\/span>)<\/span>\r\n\tif<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n\t\treturn<\/span> nil<\/span>,<\/span> err<\/span>\r\n\t}<\/span>\r\n\r\n\treturn<\/span> s<\/span>,<\/span> nil<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u521b\u5efa\u5e76\u542f\u52a8Proxier<\/h3>\n
createProxier() \u7684\u5b9e\u73b0\u4f4d\u4e8e https:\/\/github.com\/kubernetes\/kubernetes\/blob\/v1.28.4\/cmd\/kube-proxy\/app\/server_others.go#L127 \uff0c\u6839\u636e kube-proxy \u7684\u5de5\u4f5c\u6a21\u5f0f\u548c\u662f\u5426\u542f\u7528 dualStack\uff08\u540c\u65f6\u4f7f\u7528 IPv4\/6\uff09\u8fdb\u884c\u5206\u652f\u5224\u65ad\uff0c\u9009\u62e9\u8fd4\u56de\u54ea\u4e2a Proxier \u7684\u5b9e\u73b0\u3002\u5728\u5355\u6808\u7684 iptables \u4ee3\u7406\u6a21\u5f0f\u4e0b\uff0c\u5b9e\u73b0\u5982\u4e0b\u90e8\u5206\u3002<\/p>\n
\/\/ #L127<\/span>\r\n\r\n\/\/ createProxier creates the proxy.Provider<\/span>\r\nfunc<\/span> (<\/span>s<\/span> *<\/span>ProxyServer<\/span>)<\/span> createProxier<\/span>(<\/span>config<\/span> *<\/span>proxyconfigapi<\/span>.<\/span>KubeProxyConfiguration<\/span>,<\/span> dualStack<\/span> bool<\/span>)<\/span> (<\/span>proxy<\/span>.<\/span>Provider<\/span>,<\/span> error<\/span>)<\/span> {<\/span>\r\n\tvar<\/span> proxier<\/span> proxy<\/span>.<\/span>Provider<\/span>\r\n\tvar<\/span> err<\/span> error<\/span>\r\n\r\n\t\/\/ (\u4e2d\u7565)<\/span>\r\n\r\n\tif<\/span> config<\/span>.<\/span>Mode<\/span> ==<\/span> proxyconfigapi<\/span>.<\/span>ProxyModeIPTables<\/span> {<\/span>\r\n\t\tklog<\/span>.<\/span>InfoS<\/span>(<\/span>\"Using iptables Proxier\"<\/span>)<\/span>\r\n\r\n\t\tif<\/span> dualStack<\/span> {<\/span>\r\n\t\t\t\/\/ dualStack \u306e\u5834\u5408\u306e Proxier \u4f5c\u6210\u51e6\u7406<\/span>\r\n            \/\/ (\u4e2d\u7565)<\/span>\r\n\t\t}<\/span> else<\/span> {<\/span>\r\n\t\t\t\/\/ Create a single-stack proxier if and only if the node does not support dual-stack (i.e, no iptables support).<\/span>\r\n\t\t\tvar<\/span> localDetector<\/span> proxyutiliptables<\/span>.<\/span>LocalTrafficDetector<\/span>\r\n\t\t\tlocalDetector<\/span>,<\/span> err<\/span> =<\/span> getLocalDetector<\/span>(<\/span>s<\/span>.<\/span>PrimaryIPFamily<\/span>,<\/span> config<\/span>.<\/span>DetectLocalMode<\/span>,<\/span> config<\/span>,<\/span> s<\/span>.<\/span>podCIDRs<\/span>)<\/span>\r\n\t\t\tif<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n\t\t\t\treturn<\/span> nil<\/span>,<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"unable to create proxier: %v\"<\/span>,<\/span> err<\/span>)<\/span>\r\n\t\t\t}<\/span>\r\n\r\n\t\t\t\/\/ TODO this has side effects that should only happen when Run() is invoked.<\/span>\r\n\t\t\tproxier<\/span>,<\/span> err<\/span> =<\/span> iptables<\/span>.<\/span>NewProxier<\/span>(<\/span>\r\n\t\t\t\ts<\/span>.<\/span>PrimaryIPFamily<\/span>,<\/span>\r\n\t\t\t\tiptInterface<\/span>,<\/span>\r\n\t\t\t\tutilsysctl<\/span>.<\/span>New<\/span>(),<\/span>\r\n\t\t\t\texecer<\/span>,<\/span>\r\n\t\t\t\tconfig<\/span>.<\/span>IPTables<\/span>.<\/span>SyncPeriod<\/span>.<\/span>Duration<\/span>,<\/span>\r\n\t\t\t\tconfig<\/span>.<\/span>IPTables<\/span>.<\/span>MinSyncPeriod<\/span>.<\/span>Duration<\/span>,<\/span>\r\n\t\t\t\tconfig<\/span>.<\/span>IPTables<\/span>.<\/span>MasqueradeAll<\/span>,<\/span>\r\n\t\t\t\t*<\/span>config<\/span>.<\/span>IPTables<\/span>.<\/span>LocalhostNodePorts<\/span>,<\/span>\r\n\t\t\t\tint<\/span>(<\/span>*<\/span>config<\/span>.<\/span>IPTables<\/span>.<\/span>MasqueradeBit<\/span>),<\/span>\r\n\t\t\t\tlocalDetector<\/span>,<\/span>\r\n\t\t\t\ts<\/span>.<\/span>Hostname<\/span>,<\/span>\r\n\t\t\t\ts<\/span>.<\/span>NodeIPs<\/span>[<\/span>s<\/span>.<\/span>PrimaryIPFamily<\/span>],<\/span>\r\n\t\t\t\ts<\/span>.<\/span>Recorder<\/span>,<\/span>\r\n\t\t\t\ts<\/span>.<\/span>HealthzServer<\/span>,<\/span>\r\n\t\t\t\tconfig<\/span>.<\/span>NodePortAddresses<\/span>,<\/span>\r\n\t\t\t)<\/span>\r\n\t\t}<\/span>\r\n\r\n\t\tif<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n\t\t\treturn<\/span> nil<\/span>,<\/span> fmt<\/span>.<\/span>Errorf<\/span>(<\/span>\"unable to create proxier: %v\"<\/span>,<\/span> err<\/span>)<\/span>\r\n\t\t}<\/span>\r\n\t}<\/span> else<\/span> if<\/span> config<\/span>.<\/span>Mode<\/span> ==<\/span> proxyconfigapi<\/span>.<\/span>ProxyModeIPVS<\/span> {<\/span>\r\n\t\t\/\/ IPVA \u30d7\u30ed\u30ad\u30b7\u30e2\u30fc\u30c9\u306e\u5834\u5408\u306e Proxier \u4f5c\u6210\u51e6\u7406<\/span>\r\n        \/\/ (\u4e2d\u7565)<\/span>\r\n\t}<\/span>\r\n\r\n\treturn<\/span> proxier<\/span>,<\/span> nil<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
iptables.NewProxier() \u662f\u4e00\u4e2a\u4f7f\u7528iptables\u7684Proxier\u521b\u5efa\u65b9\u6cd5\uff0c\u5728https:\/\/github.com\/kubernetes\/kubernetes\/blob\/v1.28.4\/pkg\/proxy\/iptables\/proxier.go#L222\u4e2d\u6709\u5b9e\u73b0\u3002\u901a\u8fc7\u5c06\u81ea\u8eab\u7684syncProxyRules()\u4f20\u9012\u7ed9async.NewBoundedFrequencyRunner()\u6765\u8fd4\u56de\u8981\u5206\u914d\u7ed9Proxier\u7684syncRunner\u7ed3\u6784\u4f53\uff0c\u4ee5\u4fbf\u5728sync()\u6267\u884c\u65f6\u901a\u8fc7syncRunner\u6267\u884csyncProxyRules()\u3002<\/p>\n
\/\/ #L222<\/span>\r\n\r\n\/\/ NewProxier returns a new Proxier given an iptables Interface instance.<\/span>\r\n\/\/ Because of the iptables logic, it is assumed that there is only a single Proxier active on a machine.<\/span>\r\n\/\/ An error will be returned if iptables fails to update or acquire the initial lock.<\/span>\r\n\/\/ Once a proxier is created, it will keep iptables up to date in the background and<\/span>\r\n\/\/ will not terminate if a particular iptables call fails.<\/span>\r\nfunc<\/span> NewProxier<\/span>(<\/span>ipFamily<\/span> v1<\/span>.<\/span>IPFamily<\/span>,<\/span>\r\n\tipt<\/span> utiliptables<\/span>.<\/span>Interface<\/span>,<\/span>\r\n\tsysctl<\/span> utilsysctl<\/span>.<\/span>Interface<\/span>,<\/span>\r\n\texec<\/span> utilexec<\/span>.<\/span>Interface<\/span>,<\/span>\r\n\tsyncPeriod<\/span> time<\/span>.<\/span>Duration<\/span>,<\/span>\r\n\tminSyncPeriod<\/span> time<\/span>.<\/span>Duration<\/span>,<\/span>\r\n\tmasqueradeAll<\/span> bool<\/span>,<\/span>\r\n\tlocalhostNodePorts<\/span> bool<\/span>,<\/span>\r\n\tmasqueradeBit<\/span> int<\/span>,<\/span>\r\n\tlocalDetector<\/span> proxyutiliptables<\/span>.<\/span>LocalTrafficDetector<\/span>,<\/span>\r\n\thostname<\/span> string<\/span>,<\/span>\r\n\tnodeIP<\/span> net<\/span>.<\/span>IP<\/span>,<\/span>\r\n\trecorder<\/span> events<\/span>.<\/span>EventRecorder<\/span>,<\/span>\r\n\thealthzServer<\/span> healthcheck<\/span>.<\/span>ProxierHealthUpdater<\/span>,<\/span>\r\n\tnodePortAddressStrings<\/span> []<\/span>string<\/span>,<\/span>\r\n)<\/span> (<\/span>*<\/span>Proxier<\/span>,<\/span> error<\/span>)<\/span> {<\/span>\r\n\t\/\/ (\u4e2d\u7565)<\/span>\r\n\r\n\tproxier<\/span> :=<\/span> &<\/span>Proxier<\/span>{<\/span>\r\n\t\tsvcPortMap<\/span>:<\/span>               make<\/span>(<\/span>proxy<\/span>.<\/span>ServicePortMap<\/span>),<\/span>\r\n\t\tserviceChanges<\/span>:<\/span>           proxy<\/span>.<\/span>NewServiceChangeTracker<\/span>(<\/span>newServiceInfo<\/span>,<\/span> ipFamily<\/span>,<\/span> recorder<\/span>,<\/span> nil<\/span>),<\/span>\r\n\t\tendpointsMap<\/span>:<\/span>             make<\/span>(<\/span>proxy<\/span>.<\/span>EndpointsMap<\/span>),<\/span>\r\n\t\tendpointsChanges<\/span>:<\/span>         proxy<\/span>.<\/span>NewEndpointChangeTracker<\/span>(<\/span>hostname<\/span>,<\/span> newEndpointInfo<\/span>,<\/span> ipFamily<\/span>,<\/span> recorder<\/span>,<\/span> nil<\/span>),<\/span>\r\n\t\tneedFullSync<\/span>:<\/span>             true<\/span>,<\/span>\r\n\t\tsyncPeriod<\/span>:<\/span>               syncPeriod<\/span>,<\/span>\r\n\t\tiptables<\/span>:<\/span>                 ipt<\/span>,<\/span>\r\n\t\tmasqueradeAll<\/span>:<\/span>            masqueradeAll<\/span>,<\/span>\r\n\t\tmasqueradeMark<\/span>:<\/span>           masqueradeMark<\/span>,<\/span>\r\n\t\texec<\/span>:<\/span>                     exec<\/span>,<\/span>\r\n\t\tlocalDetector<\/span>:<\/span>            localDetector<\/span>,<\/span>\r\n\t\thostname<\/span>:<\/span>                 hostname<\/span>,<\/span>\r\n\t\tnodeIP<\/span>:<\/span>                   nodeIP<\/span>,<\/span>\r\n\t\trecorder<\/span>:<\/span>                 recorder<\/span>,<\/span>\r\n\t\tserviceHealthServer<\/span>:<\/span>      serviceHealthServer<\/span>,<\/span>\r\n\t\thealthzServer<\/span>:<\/span>            healthzServer<\/span>,<\/span>\r\n\t\tprecomputedProbabilities<\/span>:<\/span> make<\/span>([]<\/span>string<\/span>,<\/span> 0<\/span>,<\/span> 1001<\/span>),<\/span>\r\n\t\tiptablesData<\/span>:<\/span>             bytes<\/span>.<\/span>NewBuffer<\/span>(<\/span>nil<\/span>),<\/span>\r\n\t\texistingFilterChainsData<\/span>:<\/span> bytes<\/span>.<\/span>NewBuffer<\/span>(<\/span>nil<\/span>),<\/span>\r\n\t\tfilterChains<\/span>:<\/span>             proxyutil<\/span>.<\/span>NewLineBuffer<\/span>(),<\/span>\r\n\t\tfilterRules<\/span>:<\/span>              proxyutil<\/span>.<\/span>NewLineBuffer<\/span>(),<\/span>\r\n\t\tnatChains<\/span>:<\/span>                proxyutil<\/span>.<\/span>NewLineBuffer<\/span>(),<\/span>\r\n\t\tnatRules<\/span>:<\/span>                 proxyutil<\/span>.<\/span>NewLineBuffer<\/span>(),<\/span>\r\n\t\tlocalhostNodePorts<\/span>:<\/span>       localhostNodePorts<\/span>,<\/span>\r\n\t\tnodePortAddresses<\/span>:<\/span>        nodePortAddresses<\/span>,<\/span>\r\n\t\tnetworkInterfacer<\/span>:<\/span>        proxyutil<\/span>.<\/span>RealNetwork<\/span>{},<\/span>\r\n\t}<\/span>\r\n\r\n    burstSyncs<\/span> :=<\/span> 2<\/span>\r\n\tklog<\/span>.<\/span>V<\/span>(<\/span>2<\/span>)<\/span>.<\/span>InfoS<\/span>(<\/span>\"Iptables sync params\"<\/span>,<\/span> \"ipFamily\"<\/span>,<\/span> ipt<\/span>.<\/span>Protocol<\/span>(),<\/span> \"minSyncPeriod\"<\/span>,<\/span> minSyncPeriod<\/span>,<\/span> \"syncPeriod\"<\/span>,<\/span> syncPeriod<\/span>,<\/span> \"burstSyncs\"<\/span>,<\/span> burstSyncs<\/span>)<\/span>\r\n\t\/\/ We pass syncPeriod to ipt.Monitor, which will call us only if it needs to.<\/span>\r\n\t\/\/ We need to pass *some* maxInterval to NewBoundedFrequencyRunner anyway though.<\/span>\r\n\t\/\/ time.Hour is arbitrary.<\/span>\r\n\tproxier<\/span>.<\/span>syncRunner<\/span> =<\/span> async<\/span>.<\/span>NewBoundedFrequencyRunner<\/span>(<\/span>\"sync-runner\"<\/span>,<\/span> proxier<\/span>.<\/span>syncProxyRules<\/span>,<\/span> minSyncPeriod<\/span>,<\/span> time<\/span>.<\/span>Hour<\/span>,<\/span> burstSyncs<\/span>)<\/span>\r\n\r\n\t\/\/ (\u4e2d\u7565)<\/span>\r\n\r\n\treturn<\/span> proxier<\/span>,<\/span> nil<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
iptables.NewProxier() \u8fd4\u56de\u7684 Proxier \u7ed3\u6784\u4f53\u5b9e\u73b0\u4e86 proxy.Provider \u63a5\u53e3\uff0c\u540c\u4e00\u6587\u4ef6\u4e2d\u8fd8\u5b9e\u73b0\u4e86\u5404\u79cd\u65b9\u6cd5\u5982 ServiceHandler\u3001EndpointSliceHandler \u63a5\u53e3\uff0c\u4ee5\u53ca sync()\u3001syncLoop() \u65b9\u6cd5\u3002\u540c\u65f6\uff0c\u5728\u8fd9\u4e9b\u65b9\u6cd5\u4e2d\u8c03\u7528\u4e86 syncProxyRules() \u65b9\u6cd5\u6765\u5b9e\u9645\u64cd\u4f5c iptables\u3002\u6839\u636e\u8d44\u6e90\u7684\u72b6\u6001\u6765\u5177\u4f53\u64cd\u4f5c iptables \u7684\u65b9\u5f0f\u53ef\u4ee5\u901a\u8fc7\u67e5\u770b syncProxyRules() \u65b9\u6cd5\u7684\u5185\u5bb9\u6765\u4e86\u89e3\u3002\uff08\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u5927\u6982\u6709800\u884c…\uff09<\/p>\n
\r\n\/\/ #L759<\/span>\r\n\r\n\/\/ This is where all of the iptables-save\/restore calls happen.<\/span>\r\n\/\/ The only other iptables rules are those that are setup in iptablesInit()<\/span>\r\n\/\/ This assumes proxier.mu is NOT held<\/span>\r\nfunc<\/span> (<\/span>proxier<\/span> *<\/span>Proxier<\/span>)<\/span> syncProxyRules<\/span>()<\/span> {<\/span>\r\n\tproxier<\/span>.<\/span>mu<\/span>.<\/span>Lock<\/span>()<\/span>\r\n\tdefer<\/span> proxier<\/span>.<\/span>mu<\/span>.<\/span>Unlock<\/span>()<\/span>\r\n\r\n    \/\/ don't sync rules till we've received services and endpoints<\/span>\r\n\tif<\/span> !<\/span>proxier<\/span>.<\/span>isInitialized<\/span>()<\/span> {<\/span>\r\n\t\tklog<\/span>.<\/span>V<\/span>(<\/span>2<\/span>)<\/span>.<\/span>InfoS<\/span>(<\/span>\"Not syncing iptables until Services and Endpoints have been received from master\"<\/span>)<\/span>\r\n\t\treturn<\/span>\r\n\t}<\/span>\r\n \r\n    (<\/span>\u5f8c\u7565<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u603b\u7ed3<\/h2>\n
\u672c\u6587\u7b80\u8981\u4ecb\u7ecd\u4e86kube-proxy\u7684\u6982\u8ff0\u548c\u5b9e\u73b0\uff0c\u4ee5\u53ca\u4f5c\u4e3a\u786e\u8ba4iptables\u5728iptables\u4ee3\u7406\u6a21\u5f0f\u4e0b\u5982\u4f55\u4f7f\u7528\u7684\u51c6\u5907\u5de5\u4f5c\u3002\u4e0b\u6b21\u6211\u4eec\u5c06\u5177\u4f53\u67e5\u770bkube-proxy\u4e2diptables\u7684\u4f7f\u7528\u60c5\u51b5\u3002<\/p>\n
\u5728\u4f60\u8bfb\u5b8c\u6700\u540e\u4e00\u53e5\u4e4b\u524d\uff0c\u975e\u5e38\u611f\u8c22\u3002<\/p>\n
\u8bf7\u53c2\u9605\u5f15\u7528\u8d44\u6599<\/h2>\n
[1] Kubernetes\u7684\u7ec4\u4ef6 | Kubernetes
\n[2] \u865a\u62dfIP\u548c\u670d\u52a1\u4ee3\u7406 | Kubernetes
\n[3] iptables | ArchWiki
\n[4] kubernetes\/kubernetes | GitHub<\/p>\n","protected":false},"excerpt":{"rendered":"
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