{"id":3842,"date":"2019-02-24T13:47:31","date_gmt":"2019-02-24T05:47:31","guid":{"rendered":"http:\/\/switch.linesno.com\/?p=3842"},"modified":"2019-02-24T13:47:33","modified_gmt":"2019-02-24T05:47:33","slug":"service-%e5%92%8c-kube-proxy-%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"http:\/\/switch.linesno.com\/?p=3842","title":{"rendered":"service \u548c kube-proxy \u539f\u7406"},"content":{"rendered":"<h2 id=\"\u7b80\u4ecb\">\u7b80\u4ecb<\/h2>\n<p>\u5728 kubernetes \u96c6\u7fa4\u4e2d\uff0c\u7f51\u7edc\u662f\u975e\u5e38\u57fa\u7840\u4e5f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u90e8\u5206\u3002\u5bf9\u4e8e\u5927\u89c4\u6a21\u7684\u8282\u70b9\u548c\u5bb9\u5668\u6765\u8bf4\uff0c\u8981\u4fdd\u8bc1\u7f51\u7edc\u7684\u8fde\u901a\u6027\u3001\u7f51\u7edc\u8f6c\u53d1\u7684\u9ad8\u6548\uff0c\u540c\u65f6\u80fd\u505a\u7684 ip \u548c port \u81ea\u52a8\u5316\u5206\u914d\u548c\u7ba1\u7406\uff0c\u5e76\u8ba9\u7528\u6237\u7528\u76f4\u89c2\u7b80\u5355\u7684\u65b9\u5f0f\u6765\u8bbf\u95ee\u9700\u8981\u7684\u5e94\u7528\uff0c\u8fd9\u662f\u9700\u8981\u590d\u6742\u4e14\u7ec6\u81f4\u8bbe\u8ba1\u7684\u3002<\/p>\n<p>kubernetes \u5728\u8fd9\u65b9\u9762\u4e0b\u4e86\u5f88\u5927\u7684\u529f\u592b\uff0c\u5b83\u901a\u8fc7\u00a0<code>service<\/code>\u3001<code>dns<\/code>\u3001<code>ingress<\/code>\u00a0\u7b49\u6982\u5ff5\uff0c\u89e3\u51b3\u4e86\u670d\u52a1\u53d1\u73b0\u3001\u8d1f\u8f7d\u5747\u8861\u7684\u95ee\u9898\uff0c\u4e5f\u5927\u5927\u7b80\u5316\u4e86\u7528\u6237\u7684\u4f7f\u7528\u548c\u914d\u7f6e\u3002<\/p>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u5c31\u8bb2\u89e3\u5982\u4f55\u914d\u7f6e kubernetes \u7684\u7f51\u7edc\uff0c\u6700\u7ec8\u4ece\u96c6\u7fa4\u5185\u90e8\u548c\u96c6\u7fa4\u5916\u90e8\u90fd\u80fd\u8bbf\u95ee\u5e94\u7528\u3002<\/p>\n<h2 id=\"\u8de8\u4e3b\u673a\u7f51\u7edc\u914d\u7f6e\uff1aflannel\">\u8de8\u4e3b\u673a\u7f51\u7edc\u914d\u7f6e\uff1aflannel<\/h2>\n<p>\u4e00\u76f4\u4ee5\u6765\uff0ckubernetes \u5e76\u6ca1\u6709\u4e13\u95e8\u7684\u7f51\u7edc\u6a21\u5757\u8d1f\u8d23\u7f51\u7edc\u914d\u7f6e\uff0c\u5b83\u9700\u8981\u7528\u6237\u5728\u4e3b\u673a\u4e0a\u5df2\u7ecf\u914d\u7f6e\u597d\u7f51\u7edc\u3002kubernetes \u5bf9\u7f51\u7edc\u7684\u8981\u6c42\u662f\uff1a\u5bb9\u5668\u4e4b\u95f4\uff08\u5305\u62ec\u540c\u4e00\u53f0\u4e3b\u673a\u4e0a\u7684\u5bb9\u5668\uff0c\u548c\u4e0d\u540c\u4e3b\u673a\u7684\u5bb9\u5668\uff09\u53ef\u4ee5\u4e92\u76f8\u901a\u4fe1\uff0c\u5bb9\u5668\u548c\u96c6\u7fa4\u4e2d\u6240\u6709\u7684\u8282\u70b9\u4e5f\u80fd\u76f4\u63a5\u901a\u4fe1\u3002<\/p>\n<p>\u81f3\u4e8e\u5177\u4f53\u7684\u7f51\u7edc\u65b9\u6848\uff0c\u7528\u6237\u53ef\u4ee5\u81ea\u5df1\u9009\u62e9\uff0c\u76ee\u524d\u4f7f\u7528\u6bd4\u8f83\u591a\u7684\u662f flannel\uff0c\u56e0\u4e3a\u5b83\u6bd4\u8f83\u7b80\u5355\uff0c\u800c\u4e14\u521a\u597d\u6ee1\u8db3 kubernetes \u5bf9\u7f51\u7edc\u7684\u8981\u6c42\u3002\u6211\u4eec\u4f1a\u4f7f\u7528 flannel vxlan \u6a21\u5f0f\uff0c\u5177\u4f53\u7684\u914d\u7f6e\u6211\u5728\u535a\u5ba2\u4e4b\u524d<a href=\"http:\/\/cizixs.com\/2016\/06\/15\/flannel-overlay-network\">\u6709\u6587\u7ae0\u4ecb\u7ecd\u8fc7<\/a>\uff0c\u8fd9\u91cc\u4e0d\u518d\u8d58\u8ff0\u3002<\/p>\n<p>\u4ee5\u540e kubernetes \u7f51\u7edc\u7684\u53d1\u5c55\u65b9\u5411\u662f\u5e0c\u671b\u901a\u8fc7\u63d2\u4ef6\u7684\u65b9\u5f0f\u6765\u96c6\u6210\u4e0d\u540c\u7684\u7f51\u7edc\u65b9\u6848\uff0c\u00a0<a href=\"https:\/\/kubernetes.io\/docs\/concepts\/cluster-administration\/network-plugins\/#cni\" target=\"_blank\" rel=\"noopener\">CNI<\/a>\u00a0\u5c31\u662f\u8fd9\u4e00\u52aa\u529b\u7684\u7ed3\u679c\uff0cflannel \u4e5f\u80fd\u591f\u901a\u8fc7 CNI \u63d2\u4ef6\u7684\u5f62\u5f0f\u4f7f\u7528\u3002<\/p>\n<h2 id=\"kube-proxy-\u548c-service\">kube-proxy \u548c service<\/h2>\n<p>\u914d\u7f6e\u597d\u7f51\u7edc\u4e4b\u540e\uff0c\u96c6\u7fa4\u662f\u4ec0\u4e48\u60c5\u51b5\u5462\uff1f\u6211\u4eec\u53ef\u4ee5\u521b\u5efa pod\uff0c\u4e5f\u80fd\u901a\u8fc7 ReplicationController \u6765\u521b\u5efa\u7279\u5b9a\u526f\u672c\u7684 pod\uff08\u8fd9\u662f\u66f4\u63a8\u8350\u4e5f\u662f\u751f\u4ea7\u4e0a\u8981\u4f7f\u7528\u7684\u65b9\u6cd5\uff0c\u5373\u4f7f\u67d0\u4e2a rc \u4e2d\u53ea\u6709\u4e00\u4e2a pod \u5b9e\u4f8b\uff09\u3002\u53ef\u4ee5\u4ece\u96c6\u7fa4\u4e2d\u83b7\u53d6\u6bcf\u4e2a pod ip \u5730\u5740\uff0c\u7136\u540e\u4e5f\u80fd\u5728\u96c6\u7fa4\u5185\u90e8\u76f4\u63a5\u901a\u8fc7\u00a0<code>podIP:Port<\/code>\u00a0\u6765\u83b7\u53d6\u5bf9\u5e94\u7684\u670d\u52a1\u3002<\/p>\n<p>\u4f46\u662f\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898\uff1a<strong>pod \u662f\u7ecf\u5e38\u53d8\u5316\u7684\uff0c\u6bcf\u6b21\u66f4\u65b0 ip \u5730\u5740\u90fd\u53ef\u80fd\u4f1a\u53d1\u751f\u53d8\u5316<\/strong>\uff0c\u5982\u679c\u76f4\u63a5\u8bbf\u95ee\u5bb9\u5668 ip \u7684\u8bdd\uff0c\u4f1a\u6709\u5f88\u5927\u7684\u95ee\u9898\u3002\u800c\u4e14\u8fdb\u884c\u6269\u5c55\u7684\u65f6\u5019\uff0crc \u4e2d\u4f1a\u6709\u65b0\u7684 pod \u521b\u5efa\u51fa\u6765\uff0c\u51fa\u73b0\u65b0\u7684 ip \u5730\u5740\uff0c\u6211\u4eec\u9700\u8981\u4e00\u79cd\u66f4\u7075\u6d3b\u7684\u65b9\u5f0f\u6765\u8bbf\u95ee pod \u7684\u670d\u52a1\u3002<\/p>\n<h3 id=\"Service-\u548c-cluster-IP\">Service \u548c cluster IP<\/h3>\n<p>\u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\uff0ckubernetes \u7684\u89e3\u51b3\u65b9\u6848\u662f\u201c\u670d\u52a1\u201d\uff08service\uff09\uff0c\u6bcf\u4e2a\u670d\u52a1\u90fd\u4e00\u4e2a\u56fa\u5b9a\u7684\u865a\u62df ip\uff08\u8fd9\u4e2a ip \u4e5f\u88ab\u79f0\u4e3a cluster IP\uff09\uff0c\u81ea\u52a8\u5e76\u4e14\u52a8\u6001\u5730\u7ed1\u5b9a\u540e\u9762\u7684 pod\uff0c\u6240\u6709\u7684\u7f51\u7edc\u8bf7\u6c42\u76f4\u63a5\u8bbf\u95ee\u670d\u52a1 ip\uff0c\u670d\u52a1\u4f1a\u81ea\u52a8\u5411\u540e\u7aef\u505a\u8f6c\u53d1\u3002Service \u9664\u4e86\u63d0\u4f9b\u7a33\u5b9a\u7684\u5bf9\u5916\u8bbf\u95ee\u65b9\u5f0f\u4e4b\u5916\uff0c\u8fd8\u80fd\u8d77\u5230\u8d1f\u8f7d\u5747\u8861\uff08Load Balance\uff09\u7684\u529f\u80fd\uff0c\u81ea\u52a8\u628a\u8bf7\u6c42\u6d41\u91cf\u5206\u5e03\u5230\u540e\u7aef\u6240\u6709\u7684\u670d\u52a1\u4e0a\uff0c\u670d\u52a1\u53ef\u4ee5\u505a\u5230\u5bf9\u5ba2\u6237\u900f\u660e\u5730\u8fdb\u884c\u6c34\u5e73\u6269\u5c55\uff08scale\uff09\u3002<\/p>\n<p><img decoding=\"async\" class=\"post-img\" src=\"\" alt=\"\" data-src=\"\" \/><\/p>\n<p>\u800c\u5b9e\u73b0 service \u8fd9\u4e00\u529f\u80fd\u7684\u5173\u952e\uff0c\u5c31\u662f kube-proxy\u3002kube-proxy \u8fd0\u884c\u5728\u6bcf\u4e2a\u8282\u70b9\u4e0a\uff0c\u76d1\u542c API Server \u4e2d\u670d\u52a1\u5bf9\u8c61\u7684\u53d8\u5316\uff0c\u901a\u8fc7\u7ba1\u7406 iptables \u6765\u5b9e\u73b0\u7f51\u7edc\u7684\u8f6c\u53d1\u3002<\/p>\n<blockquote><p><strong>NOTE<\/strong>: kube-proxy \u8981\u6c42 NODE \u8282\u70b9\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u8981\u5177\u5907 \/sys\/module\/br_netfilter \u6587\u4ef6\uff0c\u800c\u4e14\u8fd8\u8981\u8bbe\u7f6e bridge-nf-call-iptables=1\uff0c\u5982\u679c\u4e0d\u6ee1\u8db3\u8981\u6c42\uff0c\u90a3\u4e48 kube-proxy \u53ea\u662f\u5c06\u68c0\u67e5\u4fe1\u606f\u8bb0\u5f55\u5230\u65e5\u5fd7\u4e2d\uff0ckube-proxy \u4ecd\u7136\u4f1a\u6b63\u5e38\u8fd0\u884c\uff0c\u4f46\u662f\u8fd9\u6837\u901a\u8fc7 Kube-proxy \u8bbe\u7f6e\u7684\u67d0\u4e9b iptables \u89c4\u5219\u5c31\u4e0d\u4f1a\u5de5\u4f5c\u3002<\/p><\/blockquote>\n<p>kube-proxy \u6709\u4e24\u79cd\u5b9e\u73b0 service \u7684\u65b9\u6848\uff1auserspace \u548c iptables<\/p>\n<ul>\n<li>userspace \u662f\u5728\u7528\u6237\u7a7a\u95f4\u76d1\u542c\u4e00\u4e2a\u7aef\u53e3\uff0c\u6240\u6709\u7684 service \u90fd\u8f6c\u53d1\u5230\u8fd9\u4e2a\u7aef\u53e3\uff0c\u7136\u540e kube-proxy \u5728\u5185\u90e8\u5e94\u7528\u5c42\u5bf9\u5176\u8fdb\u884c\u8f6c\u53d1\u3002\u56e0\u4e3a\u662f\u5728\u7528\u6237\u7a7a\u95f4\u8fdb\u884c\u8f6c\u53d1\uff0c\u6240\u4ee5\u6548\u7387\u4e5f\u4e0d\u9ad8<\/li>\n<li>iptables \u5b8c\u5168\u5b9e\u73b0 iptables \u6765\u5b9e\u73b0 service\uff0c\u662f\u76ee\u524d\u9ed8\u8ba4\u7684\u65b9\u5f0f\uff0c\u4e5f\u662f\u63a8\u8350\u7684\u65b9\u5f0f\uff0c\u6548\u7387\u5f88\u9ad8\uff08\u53ea\u6709\u5185\u6838\u4e2d netfilter \u4e00\u4e9b\u635f\u8017\uff09\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u901a\u8fc7 iptables \u6a21\u5f0f\u8fd0\u884c kube-proxy\uff0c\u540e\u9762\u7684\u5206\u6790\u4e5f\u662f\u9488\u5bf9\u8fd9\u4e2a\u6a21\u5f0f\u7684\uff0cuserspace \u53ea\u662f\u65e7\u7248\u672c\u652f\u6301\u7684\u6a21\u5f0f\uff0c\u4ee5\u540e\u53ef\u80fd\u4f1a\u653e\u5f03\u7ef4\u62a4\u548c\u652f\u6301\u3002<\/p>\n<h3 id=\"kube-proxy-\u53c2\u6570\u4ecb\u7ecd\">kube-proxy \u53c2\u6570\u4ecb\u7ecd<\/h3>\n<p>kube-proxy \u7684\u529f\u80fd\u76f8\u5bf9\u7b80\u5355\u4e00\u4e9b\uff0c\u4e5f\u6bd4\u8f83\u72ec\u7acb\uff0c\u9700\u8981\u7684\u914d\u7f6e\u5e76\u4e0d\u662f\u5f88\u591a\uff0c\u6bd4\u8f83\u5e38\u7528\u7684\u542f\u52a8\u53c2\u6570\u5305\u62ec\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u53c2\u6570<\/th>\n<th>\u542b\u4e49<\/th>\n<th>\u9ed8\u8ba4\u503c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u2013alsologtostderr<\/td>\n<td>\u6253\u5370\u65e5\u5fd7\u5230\u6807\u51c6\u8f93\u51fa<\/td>\n<td>false<\/td>\n<\/tr>\n<tr>\n<td>\u2013bind-address<\/td>\n<td>HTTP \u76d1\u542c\u5730\u5740<\/td>\n<td>0.0.0.0<\/td>\n<\/tr>\n<tr>\n<td>\u2013cleanup-iptables<\/td>\n<td>\u5982\u679c\u8bbe\u7f6e\u4e3a true\uff0c\u4f1a\u6e05\u7406 proxy \u8bbe\u7f6e\u7684 iptables \u9009\u9879\u5e76\u9000\u51fa<\/td>\n<td>false<\/td>\n<\/tr>\n<tr>\n<td>\u2013healthz-bind-address<\/td>\n<td>\u5065\u5eb7\u68c0\u67e5 HTTP API \u76d1\u542c\u7aef\u53e3<\/td>\n<td>127.0.0.1<\/td>\n<\/tr>\n<tr>\n<td>\u2013healthz-port<\/td>\n<td>\u5065\u5eb7\u68c0\u67e5\u7aef\u53e3<\/td>\n<td>10249<\/td>\n<\/tr>\n<tr>\n<td>\u2013iptables-masquerade-bit<\/td>\n<td>\u4f7f\u7528 iptables \u8fdb\u884c SNAT \u7684\u63a9\u7801\u957f\u5ea6<\/td>\n<td>14<\/td>\n<\/tr>\n<tr>\n<td>\u2013iptables-sync-period<\/td>\n<td>iptables \u66f4\u65b0\u9891\u7387<\/td>\n<td>30s<\/td>\n<\/tr>\n<tr>\n<td>\u2013kubeconfig<\/td>\n<td>kubeconfig \u914d\u7f6e\u6587\u4ef6\u5730\u5740<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u2013log-dir<\/td>\n<td>\u65e5\u5fd7\u6587\u4ef6\u76ee\u5f55\/\u8def\u5f84<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u2013masquerade-all<\/td>\n<td>\u5982\u679c\u4f7f\u7528 iptables \u6a21\u5f0f\uff0c\u5bf9\u6240\u6709\u6d41\u91cf\u8fdb\u884c SNAT \u5904\u7406<\/td>\n<td>false<\/td>\n<\/tr>\n<tr>\n<td>\u2013master<\/td>\n<td>kubernetes master API Server \u5730\u5740<\/td>\n<td><\/td>\n<\/tr>\n<tr>\n<td>\u2013proxy-mode<\/td>\n<td>\u4ee3\u7406\u6a21\u5f0f\uff0c<code>userspace<\/code>\u00a0\u6216\u8005\u00a0<code>iptables<\/code>\uff0c \u76ee\u524d\u9ed8\u8ba4\u662f\u00a0<code>iptables<\/code>\uff0c\u5982\u679c\u7cfb\u7edf\u6216\u8005 iptables \u7248\u672c\u4e0d\u591f\u65b0\uff0c\u4f1a fallback \u5230 userspace \u6a21\u5f0f<\/td>\n<td>iptables<\/td>\n<\/tr>\n<tr>\n<td>\u2013proxy-port-range<\/td>\n<td>\u4ee3\u7406\u4f7f\u7528\u7684\u7aef\u53e3\u8303\u56f4\uff0c \u683c\u5f0f\u4e3a\u00a0<code>beginPort-endPort<\/code>\uff0c\u5982\u679c\u6ca1\u6709\u6307\u5b9a\uff0c\u4f1a\u968f\u673a\u9009\u62e9<\/td>\n<td><code>0-0<\/code><\/td>\n<\/tr>\n<tr>\n<td>\u2013udp-timeout<\/td>\n<td>UDP \u7a7a\u8fde\u63a5 timeout \u65f6\u95f4\uff0c\u53ea\u5bf9\u00a0<code>userspace<\/code>\u00a0\u6a21\u5f0f\u6709\u7528<\/td>\n<td>250ms<\/td>\n<\/tr>\n<tr>\n<td>\u2013v<\/td>\n<td>\u65e5\u5fd7\u7ea7\u522b<\/td>\n<td>0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><code>kube-proxy<\/code>\u00a0\u7684\u5de5\u4f5c\u6a21\u5f0f\u53ef\u4ee5\u901a\u8fc7\u00a0<code>--proxy-mode<\/code>\u00a0\u8fdb\u884c\u914d\u7f6e\uff0c\u53ef\u4ee5\u9009\u62e9\u00a0<code>userspace<\/code>\u00a0\u6216\u8005\u00a0<code>iptables<\/code>\u3002<\/p>\n<h3 id=\"\u5b9e\u4f8b\u542f\u52a8\u548c\u6d4b\u8bd5\">\u5b9e\u4f8b\u542f\u52a8\u548c\u6d4b\u8bd5<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u5728\u7ec8\u7aef\u4e0a\u542f\u52a8\u00a0<code>kube-proxy<\/code>\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u8bf8\u5982\u00a0<code>systemd<\/code>\u00a0\u8fd9\u6837\u7684\u5de5\u5177\u6765\u7ba1\u7406\u5b83\uff0c\u6bd4\u5982\u4e0b\u9762\u5c31\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u00a0<code>kube-proxy.service<\/code>\u00a0\u914d\u7f6e\u6587\u4ef6<\/p>\n<pre><code class=\"hljs makefile\">[root@localhost]<span class=\"hljs-comment\"># cat \/usr\/lib\/systemd\/system\/kube-proxy.service<\/span>\r\n[Unit]\r\nDescription=Kubernetes Proxy Service\r\nDocumentation=http:\/\/kubernetes.com\r\nAfter=network.target\r\nWants=network.target\r\n\r\n[Service]\r\nType=simple\r\nEnvironmentFile=-\/etc\/sysconfig\/kube-proxy\r\nExecStart=\/usr\/bin\/kube-proxy \\\r\n    --master=http:\/\/172.17.8.100:8080 \\\r\n    --v=4 \\\r\n    --proxy-mode=iptables\r\nTimeoutStartSec=0\r\nRestart=on-abnormal\r\n\r\n[Install]\r\nWantedBy=multi-user.target\r\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u65b9\u4fbf\u6d4b\u8bd5\uff0c\u6211\u4eec\u521b\u5efa\u4e00\u4e2a rc\uff0c\u91cc\u9762\u6709\u4e09\u4e2a pod\u3002\u8fd9\u4e2a pod \u8fd0\u884c\u7684\u662f\u00a0<a href=\"https:\/\/github.com\/cizixs\/whoami\" target=\"_blank\" rel=\"noopener\"><code>cizixs\/whoami<\/code>\u00a0\u5bb9\u5668<\/a>\uff0c\u5b83\u662f\u4e00\u4e2a\u7b80\u5355\u7684 HTTP \u670d\u52a1\u5668\uff0c\u76d1\u542c\u5728 3000 \u7aef\u53e3\uff0c\u8bbf\u95ee\u5b83\u4f1a\u8fd4\u56de\u5bb9\u5668\u7684 hostname\u3002<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\"><span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># cat whoami-rc.yml<\/span><\/span>\r\napiVersion: v1\r\nkind: ReplicationController\r\nmetadata:\r\n  name: <span class=\"token function\">whoami<\/span>\r\nspec:\r\n  replicas: 3\r\n  selector:\r\n    app: <span class=\"token function\">whoami<\/span>\r\n  template:\r\n    metadata:\r\n      name: <span class=\"token function\">whoami<\/span>\r\n      labels:\r\n        app: <span class=\"token function\">whoami<\/span>\r\n        env: dev\r\n    spec:\r\n      containers:\r\n      - name: <span class=\"token function\">whoami<\/span>\r\n        image: cizixs\/whoami:v0.5\r\n        ports:\r\n        - containerPort: 3000\r\n        env:\r\n          - name: MESSAGE\r\n            value: viola\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u4e3a\u6bcf\u4e2a pod \u8bbe\u7f6e\u4e86\u4e24\u4e2a label\uff1a<code>app=whoami<\/code>\u00a0\u548c\u00a0<code>env=dev<\/code>\uff0c\u8fd9\u4e24\u4e2a\u6807\u7b7e\u5f88\u91cd\u8981\uff0c\u4e5f\u662f\u540e\u9762\u670d\u52a1\u8fdb\u884c\u7ed1\u5b9a pod \u7684\u5173\u952e\u3002<\/p>\n<p>\u4e3a\u4e86\u4f7f\u7528 service\uff0c\u6211\u4eec\u8fd8\u8981\u5b9a\u4e49\u53e6\u5916\u4e00\u4e2a\u6587\u4ef6\uff0c\u5e76\u901a\u8fc7\u00a0<code>kubectl create -f .\/whoami-svc.yml<\/code>\u00a0\u6765\u521b\u5efa\u51fa\u6765\u5bf9\u8c61\uff1a<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\">apiVersion: v1\r\nkind: Service\r\nmetadata:\r\n  labels:\r\n    name: <span class=\"token function\">whoami<\/span>\r\n  name: <span class=\"token function\">whoami<\/span>\r\nspec:\r\n  ports:\r\n    - port: 3000\r\n      targetPort: 3000\r\n      protocol: TCP\r\n  selector:\r\n    app: <span class=\"token function\">whoami<\/span>\r\n    env: dev\r\n<\/code><\/pre>\n<p>\u5176\u4e2d\u00a0<code>selector<\/code>\u00a0\u544a\u8bc9 kubernetes \u8fd9\u4e2a service \u548c\u540e\u7aef\u54ea\u4e9b pod \u7ed1\u5b9a\u5728\u4e00\u8d77\uff0c\u8fd9\u91cc\u5305\u542b\u7684\u952e\u503c\u5bf9\u4f1a\u5bf9\u6240\u6709 pod \u7684\u00a0<code>labels<\/code>\u00a0\u8fdb\u884c\u5339\u914d\uff0c\u53ea\u8981\u5b8c\u5168\u5339\u914d\uff0cservice \u5c31\u4f1a\u628a pod \u4f5c\u4e3a\u540e\u7aef\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cservice \u548c rc \u5e76\u4e0d\u662f\u5bf9\u5e94\u7684\u5173\u7cfb\uff0c\u4e00\u4e2a service \u53ef\u80fd\u4f1a\u4f7f\u7528\u591a\u4e2a rc \u7ba1\u7406\u7684 pod \u4f5c\u4e3a\u540e\u7aef\u5e94\u7528\u3002<\/p>\n<p><code>ports<\/code>\u00a0\u5b57\u6bb5\u6307\u5b9a\u670d\u52a1\u7684\u7aef\u53e3\u4fe1\u606f\uff1a<\/p>\n<ul>\n<li><code>port<\/code>\uff1a\u865a\u62df ip \u8981\u7ed1\u5b9a\u7684 port\uff0c\u6bcf\u4e2a service \u4f1a\u521b\u5efa\u51fa\u6765\u4e00\u4e2a\u865a\u62df ip\uff0c\u901a\u8fc7\u8bbf\u95ee\u00a0<code>vip:port<\/code>\u00a0\u5c31\u80fd\u83b7\u53d6\u670d\u52a1\u7684\u5185\u5bb9\u3002\u8fd9\u4e2a port \u53ef\u4ee5\u7528\u6237\u968f\u673a\u9009\u53d6\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u670d\u52a1\u90fd\u6709\u81ea\u5df1\u7684 vip\uff0c\u4e5f\u4e0d\u7528\u62c5\u5fc3\u51b2\u7a81\u7684\u60c5\u51b5<\/li>\n<li><code>targetPort<\/code>\uff1apod \u4e2d\u66b4\u9732\u51fa\u6765\u7684 port\uff0c\u8fd9\u662f\u8fd0\u884c\u7684\u5bb9\u5668\u4e2d\u5177\u4f53\u66b4\u9732\u51fa\u6765\u7684\u7aef\u53e3\uff0c\u4e00\u5b9a\u4e0d\u80fd\u5199\u9519<\/li>\n<li><code>protocol<\/code>\uff1a\u63d0\u4f9b\u670d\u52a1\u7684\u534f\u8bae\u7c7b\u578b\uff0c\u53ef\u4ee5\u662f\u00a0<code>TCP<\/code>\u00a0\u6216\u8005\u00a0<code>UDP<\/code><\/li>\n<\/ul>\n<p>\u521b\u5efa\u4e4b\u540e\u53ef\u4ee5\u5217\u51fa service \uff0c\u53d1\u73b0\u6211\u4eec\u521b\u5efa\u7684 service \u5df2\u7ecf\u5206\u914d\u4e86\u4e00\u4e2a\u865a\u62df ip (10.10.10.28)\uff0c\u8fd9\u4e2a\u865a\u62df ip \u5730\u5740\u662f\u4e0d\u4f1a\u53d8\u5316\u7684\uff08\u9664\u975e service \u88ab\u5220\u9664\uff09\u3002\u67e5\u770b service \u7684\u8be6\u60c5\u53ef\u4ee5\u770b\u5230\u5b83\u7684 endpoints \u5217\u51fa\uff0c\u5bf9\u5e94\u4e86\u5177\u4f53\u63d0\u4f9b\u670d\u52a1\u7684 pod \u5730\u5740\u548c\u7aef\u53e3\u3002<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\"><span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># kubectl get svc<\/span><\/span>\r\nNAME         CLUSTER-IP    EXTERNAL-IP   PORT<span class=\"token punctuation\">(<\/span>S<span class=\"token punctuation\">)<\/span>    AGE\r\nkubernetes   10.10.10.1    <span class=\"token operator\">&lt;<\/span>none<span class=\"token operator\">&gt;<\/span>        443\/TCP    19d\r\n<span class=\"token function\">whoami<\/span>       10.10.10.28   <span class=\"token operator\">&lt;<\/span>none<span class=\"token operator\">&gt;<\/span>        3000\/TCP   1d\r\n\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># kubectl describe svc whoami<\/span><\/span>\r\nName:                   <span class=\"token function\">whoami<\/span>\r\nNamespace:              default\r\nLabels:                 name<span class=\"token operator\">=<\/span>whoami\r\nSelector:               app<span class=\"token operator\">=<\/span>whoami\r\nType:                   ClusterIP\r\nIP:                     10.10.10.28\r\nPort:                   <span class=\"token operator\">&lt;<\/span><span class=\"hljs-built_in\">unset<\/span><span class=\"token operator\">&gt;<\/span> 3000\/TCP\r\nEndpoints:              10.11.32.6:3000,10.13.192.4:3000,10.16.192.3:3000\r\nSession Affinity:       None\r\nNo events.\r\n<\/code><\/pre>\n<p>\u9ed8\u8ba4\u7684 service \u7c7b\u578b\u662f\u00a0<code>ClusterIP<\/code>\uff0c\u8fd9\u4e2a\u4e5f\u53ef\u4ee5\u4ece\u4e0a\u9762\u8f93\u51fa\u770b\u51fa\u6765\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ea\u80fd\u4ece\u96c6\u7fa4\u5185\u90e8\u8bbf\u95ee\u8fd9\u4e2a IP\uff0c\u4e0d\u80fd\u76f4\u63a5\u4ece\u96c6\u7fa4\u5916\u90e8\u8bbf\u95ee\u670d\u52a1\u3002\u5982\u679c\u60f3\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\uff0c\u6211\u4eec\u540e\u9762\u4f1a\u8bb2\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p>\u6d4b\u8bd5\u4e00\u4e0b\uff0c\u8bbf\u95ee service \u670d\u52a1\u7684\u65f6\u5019\u53ef\u4ee5\u770b\u5230\u5b83\u4f1a\u968f\u673a\u5730\u8bbf\u95ee\u540e\u7aef\u7684 pod\uff0c\u7ed9\u51fa\u4e0d\u540c\u7684\u8fd4\u56de\uff1a<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\"><span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># curl http:\/\/10.10.10.28:3000<\/span><\/span>\r\nviola from whoami-8fpqp\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># curl http:\/\/10.10.10.28:3000<\/span><\/span>\r\nviola from whoami-c0x6h\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># curl http:\/\/10.10.10.28:3000<\/span><\/span>\r\nviola from whoami-8fpqp\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># curl http:\/\/10.10.10.28:3000<\/span><\/span>\r\nviola from whoami-dc9ds\r\n<\/code><\/pre>\n<p>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u670d\u52a1\u4f1a\u968f\u673a\u8f6c\u53d1\u5230\u53ef\u7528\u7684\u540e\u7aef\u3002\u5982\u679c\u5e0c\u671b\u4fdd\u6301\u4f1a\u8bdd\uff08\u540c\u4e00\u4e2a client \u6c38\u8fdc\u90fd\u8f6c\u53d1\u5230\u76f8\u540c\u7684 pod\uff09\uff0c\u53ef\u4ee5\u628a\u00a0<code>service.spec.sessionAffinity<\/code>\u00a0\u8bbe\u7f6e\u4e3a\u00a0<code>ClientIP<\/code>\u3002<\/p>\n<p><strong>NOTE<\/strong>: \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u670d\u52a1\u5206\u914d\u7684 cluster IP \u662f\u4e00\u4e2a\u865a\u62df ip\uff0c\u5982\u679c\u4f60\u5c1d\u8bd5\u00a0<code>ping<\/code>\u00a0\u8fd9\u4e2a IP \u4f1a\u53d1\u73b0\u5b83\u6ca1\u6709\u4efb\u4f55\u54cd\u5e94\uff0c\u8fd9\u4e5f\u662f\u521a\u63a5\u89e6 kubernetes service \u7684\u4eba\u7ecf\u5e38\u4f1a\u72af\u7684\u9519\u8bef\u3002\u5b9e\u9645\u4e0a\uff0c\u8fd9\u4e2a\u865a\u62df IP \u53ea\u6709\u548c\u5b83\u7684 port \u4e00\u8d77\u7684\u65f6\u5019\u624d\u6709\u4f5c\u7528\uff0c\u76f4\u63a5\u8bbf\u95ee\u5b83\uff0c\u6216\u8005\u60f3\u8bbf\u95ee\u8be5 IP \u7684\u5176\u4ed6\u7aef\u53e3\u90fd\u662f\u5f92\u52b3\u3002<\/p>\n<h3 id=\"\u5916\u90e8\u80fd\u591f\u8bbf\u95ee\u7684\u670d\u52a1\">\u5916\u90e8\u80fd\u591f\u8bbf\u95ee\u7684\u670d\u52a1<\/h3>\n<p>\u4e0a\u9762\u521b\u5efa\u7684\u670d\u52a1\u53ea\u80fd\u5728\u96c6\u7fa4\u5185\u90e8\u8bbf\u95ee\uff0c\u8fd9\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u8fd8\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u3002\u5982\u679c\u5e0c\u671b\u6709\u4e00\u4e2a\u80fd\u76f4\u63a5\u5bf9\u5916\u4f7f\u7528\u7684\u670d\u52a1\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0<code>NodePort<\/code>\u00a0\u6216\u8005\u00a0<code>LoadBalancer<\/code>\u00a0\u7c7b\u578b\u7684 Service\u3002\u6211\u4eec\u5148\u8bf4\u8bf4\u00a0<code>NodePort<\/code>\u00a0\uff0c\u5b83\u7684\u610f\u601d\u662f\u5728\u6240\u6709 worker \u8282\u70b9\u4e0a\u66b4\u9732\u4e00\u4e2a\u7aef\u53e3\uff0c\u8fd9\u6837\u5916\u90e8\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u8bbf\u95ee\u00a0<code>nodeIP:Port<\/code>\u00a0\u6765\u8bbf\u95ee\u5e94\u7528\u3002<\/p>\n<p>\u6211\u4eec\u5148\u628a\u521a\u624d\u521b\u5efa\u7684\u670d\u52a1\u5220\u9664\uff1a<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\"><span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># kubectl delete rc whoami<\/span><\/span>\r\nreplicationcontroller <span class=\"token string\"><span class=\"hljs-string\">\"whoami\"<\/span><\/span> deleted\r\n\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># kubectl delete svc whoami<\/span><\/span>\r\n<span class=\"token function\">service<\/span> <span class=\"token string\"><span class=\"hljs-string\">\"whoami\"<\/span><\/span> deleted\r\n\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># kubectl get pods,svc,rc<\/span><\/span>\r\nNAME         CLUSTER-IP   EXTERNAL-IP   PORT<span class=\"token punctuation\">(<\/span>S<span class=\"token punctuation\">)<\/span>   AGE\r\nkubernetes   10.10.10.1   <span class=\"token operator\">&lt;<\/span>none<span class=\"token operator\">&gt;<\/span>        443\/TCP   14h\r\n<\/code><\/pre>\n<p>\u5bf9\u6211\u4eec\u539f\u6765\u7684\u00a0<code>Service<\/code>\u00a0\u914d\u7f6e\u6587\u4ef6\u8fdb\u884c\u4fee\u6539\uff0c\u628a\u00a0<code>spec.type<\/code>\u00a0\u5199\u6210\u00a0<code>NodePort<\/code>\u00a0\u7c7b\u578b\uff1a<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\"><span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># cat whoami-svc.yml<\/span><\/span>\r\napiVersion: v1\r\nkind: Service\r\nmetadata:\r\n  labels:\r\n    name: <span class=\"token function\">whoami<\/span>\r\n  name: <span class=\"token function\">whoami<\/span>\r\nspec:\r\n  ports:\r\n    - port: 3000\r\n      protocol: TCP\r\n      <span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># nodePort: 31000<\/span><\/span>\r\n  selector:\r\n    app: <span class=\"token function\">whoami<\/span>\r\n  <span class=\"hljs-built_in\">type<\/span>: NodePort\r\n<\/code><\/pre>\n<p>\u56e0\u4e3a\u6211\u4eec\u7684\u5e94\u7528\u6bd4\u8f83\u7b80\u5355\uff0c\u53ea\u6709\u4e00\u4e2a\u7aef\u53e3\u3002\u5982\u679c pod \u6709\u591a\u4e2a\u7aef\u53e3\uff0c\u4e5f\u53ef\u4ee5\u5728\u00a0<code>spec.ports<\/code>\u4e2d\u7ee7\u7eed\u6dfb\u52a0\uff0c\u53ea\u6709\u4fdd\u8bc1\u591a\u4e2a port \u4e4b\u95f4\u4e0d\u51b2\u7a81\u5c31\u884c\u3002<\/p>\n<p>\u91cd\u65b0\u521b\u5efa rc \u548c svc\uff1a<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\"><span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># kubectl create -f .\/whoami-svc.yml<\/span><\/span>\r\n<span class=\"token function\">service<\/span> <span class=\"token string\"><span class=\"hljs-string\">\"whoami\"<\/span><\/span> created\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># kubectl get rc,pods,svc<\/span><\/span>\r\nNAME        DESIRED   CURRENT   READY     AGE\r\nrc\/whoami   3         3         3         10s\r\n\r\nNAME              READY     STATUS    RESTARTS   AGE\r\npo\/whoami-8zc3d   1\/1       Running   0          10s\r\npo\/whoami-mc2<span class=\"hljs-built_in\">fg<\/span>   1\/1       Running   0          10s\r\npo\/whoami-z6skj   1\/1       Running   0          10s\r\n\r\nNAME             CLUSTER-IP     EXTERNAL-IP   PORT<span class=\"token punctuation\">(<\/span>S<span class=\"token punctuation\">)<\/span>          AGE\r\nsvc\/kubernetes   10.10.10.1     <span class=\"token operator\">&lt;<\/span>none<span class=\"token operator\">&gt;<\/span>        443\/TCP          14h\r\nsvc\/whoami       10.10.10.163   <span class=\"token operator\">&lt;<\/span>nodes<span class=\"token operator\">&gt;<\/span>       3000:31647\/TCP   7s\r\n<\/code><\/pre>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u56e0\u4e3a\u6211\u4eec\u6ca1\u6709\u6307\u5b9a\u00a0<code>nodePort<\/code>\u00a0\u7684\u503c\uff0ckubernetes \u4f1a\u81ea\u52a8\u7ed9\u6211\u4eec\u5206\u914d\u4e00\u4e2a\uff0c\u6bd4\u5982\u8fd9\u91cc\u7684\u00a0<code>31647<\/code>\uff08\u9ed8\u8ba4\u7684\u53d6\u503c\u8303\u56f4\u662f 30000-32767\uff09\u3002\u5f53\u7136\u6211\u4eec\u4e5f\u53ef\u4ee5\u5220\u9664\u914d\u7f6e\u4e2d\u00a0<code># nodePort: 31000<\/code>\u00a0\u7684\u6ce8\u91ca\uff0c\u8fd9\u6837\u4f1a\u4f7f\u7528\u00a0<code>31000<\/code>\u00a0\u7aef\u53e3\u3002<\/p>\n<p><code>nodePort<\/code>\u00a0\u7c7b\u578b\u7684\u670d\u52a1\u4f1a\u5728\u6240\u6709\u7684 worker \u8282\u70b9\uff08\u8fd0\u884c\u4e86 kube-proxy\uff09\u4e0a\u7edf\u4e00\u66b4\u9732\u51fa\u7aef\u53e3\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\uff0c\u4e5f\u5c31\u662f\u8bf4\u5916\u90e8\u53ef\u4ee5\u4efb\u610f\u9009\u62e9\u4e00\u4e2a\u8282\u70b9\u8fdb\u884c\u8bbf\u95ee\u3002\u6bd4\u5982\u6211\u672c\u5730\u96c6\u7fa4\u6709\u4e09\u4e2a\u8282\u70b9\uff1a<code>172.17.8.100<\/code>\u3001<code>172.17.8.101<\/code>\u00a0\u548c\u00a0<code>172.17.8.102<\/code>\uff1a<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\"><span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># curl http:\/\/172.17.8.100:31647<\/span><\/span>\r\nviola from whoami-mc2<span class=\"hljs-built_in\">fg<\/span>\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># curl http:\/\/172.17.8.101:31647<\/span><\/span>\r\nviola from whoami-8zc3d\r\n<span class=\"token punctuation\">[<\/span>root@localhost ~<span class=\"token punctuation\">]<\/span><span class=\"token comment\" spellcheck=\"true\"><span class=\"hljs-comment\"># curl http:\/\/172.17.8.102:31647<\/span><\/span>\r\nviola from whoami-z6skj\r\n<\/code><\/pre>\n<p>\u6709\u4e86\u00a0<code>nodePort<\/code>\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u5916\u90e8\u7684 Load Balance \u6216\u8005\u8def\u7531\u5668\u628a\u6d41\u91cf\u8f6c\u53d1\u5230\u4efb\u610f\u7684\u8282\u70b9\uff0c\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\u7684\u540c\u65f6\uff0c\u4e5f\u53ef\u4ee5\u505a\u5230\u8d1f\u8f7d\u5747\u8861\u7684\u6548\u679c\u3002<\/p>\n<p><code>nodePort<\/code>\u00a0\u7c7b\u578b\u7684\u670d\u52a1\u5e76\u4e0d\u5f71\u54cd\u539f\u6765\u865a\u62df IP \u7684\u8bbf\u95ee\u65b9\u5f0f\uff0c\u5185\u90e8\u8282\u70b9\u4f9d\u7136\u53ef\u4ee5\u901a\u8fc7\u00a0<code>vip:port<\/code>\u00a0\u7684\u65b9\u5f0f\u8fdb\u884c\u8bbf\u95ee\u3002<\/p>\n<p><code>LoadBalancer<\/code>\u00a0\u7c7b\u578b\u7684\u670d\u52a1\u9700\u8981\u516c\u6709\u4e91\u652f\u6301\uff0c\u5982\u679c\u4f60\u7684\u96c6\u7fa4\u90e8\u7f72\u5728\u516c\u6709\u4e91\uff08GCE\u3001AWS\u7b49\uff09\u53ef\u4ee5\u8003\u8651\u8fd9\u79cd\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"service-\u539f\u7406\u89e3\u6790\">service \u539f\u7406\u89e3\u6790<\/h2>\n<p>\u76ee\u524d kube-proxy \u9ed8\u8ba4\u4f7f\u7528 iptables \u6a21\u5f0f\uff0c\u4e0a\u8ff0\u5c55\u73b0\u7684 service \u529f\u80fd\u90fd\u662f\u901a\u8fc7\u4fee\u6539 iptables \u5b9e\u73b0\u7684\u3002<\/p>\n<p>\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u4ece\u4e3b\u673a\u4e0a\u8bbf\u95ee\u00a0<code>service:port<\/code>\u00a0\u7684\u65f6\u5019\u53d1\u751f\u4e86\u4ec0\u4e48\uff08\u901a\u8fc7\u00a0<code>iptables-save<\/code>\u00a0\u547d\u4ee4\u6253\u5370\u51fa\u6765\u5f53\u524d\u673a\u5668\u4e0a\u7684 iptables \u89c4\u5219\uff09\u3002<\/p>\n<p>\u6240\u6709\u53d1\u9001\u51fa\u53bb\u7684\u62a5\u6587\u4f1a\u8fdb\u5165 KUBE-SERVICES \u8fdb\u884c\u5904\u7406<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\">*nat\r\n-A OUTPUT -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"kubernetes service portals\"<\/span><\/span> -j KUBE-SERVICES\r\n<\/code><\/pre>\n<p>KUBE-SERVICES \u6bcf\u6761\u89c4\u5219\u5bf9\u5e94\u4e86\u4e00\u4e2a service\uff0c\u5b83\u544a\u8bc9\u7ee7\u7eed\u8fdb\u5165\u5230\u67d0\u4e2a\u5177\u4f53\u7684 service chain \u8fdb\u884c\u5904\u7406\uff0c\u6bd4\u5982\u8fd9\u91cc\u7684\u00a0<code>KUBE-SVC-OQCLJJ5GLLNFY3XB<\/code><\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\">-A KUBE-SERVICES <span class=\"hljs-_\">-d<\/span> 10.10.10.28\/32 -p tcp -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"default\/whoami: cluster IP\"<\/span><\/span> -m tcp --dport 3000 -j KUBE-SVC-OQCLJJ5GLLNFY3XB\r\n<\/code><\/pre>\n<p>\u66f4\u5177\u4f53\u7684 chain \u4e2d\u5b9a\u4e49\u4e86\u600e\u4e48\u8f6c\u53d1\u5230\u5bf9\u5e94 endpoint \u7684\u89c4\u5219\uff0c\u6bd4\u5982\u6211\u4eec\u7684 rc \u6709\u4e09\u4e2a pods\uff0c\u8fd9\u91cc\u4e5f\u5c31\u4f1a\u751f\u6210\u4e09\u4e2a\u89c4\u5219\u3002\u8fd9\u91cc\u5229\u7528\u4e86 iptables \u968f\u673a\u548c\u6982\u7387\u8f6c\u53d1\u7684\u529f\u80fd<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\">-A KUBE-SVC-OQCLJJ5GLLNFY3XB -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"default\/whoami:\"<\/span><\/span> -m statistic --mode random --probability 0.33332999982 -j KUBE-SEP-VN72UHNM6XOXLRPW\r\n-A KUBE-SVC-OQCLJJ5GLLNFY3XB -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"default\/whoami:\"<\/span><\/span> -m statistic --mode random --probability 0.50000000000 -j KUBE-SEP-YXCSPWPTUFI5WI5Y\r\n-A KUBE-SVC-OQCLJJ5GLLNFY3XB -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"default\/whoami:\"<\/span><\/span> -j KUBE-SEP-FN74S3YUBFMWHBLF\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u6765\u770b\u7b2c\u4e00\u4e2a chain\uff0c\u8fd9\u4e2a chain \u6709\u4e24\u4e2a\u89c4\u5219\uff0c\u7b2c\u4e00\u4e2a\u8868\u793a\u7ed9\u62a5\u6587\u6253\u4e0a mark\uff1b\u7b2c\u4e8c\u4e2a\u662f\u8fdb\u884c DNAT\uff08\u4fee\u6539\u62a5\u6587\u7684\u76ee\u7684\u5730\u5740\uff09\uff0c\u8f6c\u53d1\u5230\u67d0\u4e2a pod \u5730\u5740\u548c\u7aef\u53e3\u3002<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\">-A KUBE-SEP-VN72UHNM6XOXLRPW <span class=\"hljs-_\">-s<\/span> 10.11.32.6\/32 -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"default\/whoami:\"<\/span><\/span> -j KUBE-MARK-MASQ\r\n-A KUBE-SEP-VN72UHNM6XOXLRPW -p tcp -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"default\/whoami:\"<\/span><\/span> -m tcp -j DNAT --to-destination 10.11.32.6:3000\r\n<\/code><\/pre>\n<p>\u56e0\u4e3a\u5730\u5740\u662f\u53d1\u9001\u51fa\u53bb\u7684\uff0c\u62a5\u6587\u4f1a\u6839\u636e\u8def\u7531\u89c4\u5219\u8fdb\u884c\u5904\u7406\uff0c\u540e\u7eed\u7684\u62a5\u6587\u5c31\u662f\u901a\u8fc7 flannel \u7684\u7f51\u7edc\u8def\u5f84\u53d1\u9001\u51fa\u53bb\u7684\u3002<\/p>\n<p><code>nodePort<\/code>\u00a0\u7c7b\u578b\u7684 service \u539f\u7406\u4e5f\u662f\u7c7b\u4f3c\u7684\uff0c\u5728\u00a0<code>KUBE-SERVICES<\/code>\u00a0chain \u7684\u6700\u540e\uff0c\u5982\u679c\u76ee\u6807\u5730\u5740\u4e0d\u662f VIP \u5219\u4f1a\u901a\u8fc7\u00a0<code>KUBE-NODEPORTS<\/code>\u00a0\uff1a<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\">Chain KUBE-SERVICES <span class=\"token punctuation\">(<\/span>2 references<span class=\"token punctuation\">)<\/span>\r\n pkts bytes target     prot opt <span class=\"token keyword\"><span class=\"hljs-keyword\">in<\/span><\/span>     out     <span class=\"token function\"><span class=\"hljs-built_in\">source<\/span><\/span>               destination         \r\n    0     0 KUBE-NODEPORTS  all  --  *      *       0.0.0.0\/0            0.0.0.0\/0            \/* kubernetes <span class=\"token function\">service<\/span> nodeports<span class=\"token punctuation\">;<\/span> NOTE: this must be the last rule <span class=\"token keyword\"><span class=\"hljs-keyword\">in<\/span><\/span> this chain *\/ ADDRTYPE match dst-type LOCAL\r\n<\/code><\/pre>\n<p>\u800c\u00a0<code>KUBE-NODEPORTS<\/code>\u00a0chain \u548c\u00a0<code>KUBE-SERVICES<\/code>\u00a0chain \u5176\u4ed6\u89c4\u5219\u4e00\u6837\uff0c\u90fd\u662f\u8f6c\u53d1\u5230\u66f4\u5177\u4f53\u7684\u00a0<code>service<\/code>\u00a0chain\uff0c\u7136\u540e\u8f6c\u53d1\u5230\u67d0\u4e2a pod \u4e0a\u9762\u3002<\/p>\n<pre class=\" language-bash\"><code class=\"language-bash hljs\">-A KUBE-NODEPORTS -p tcp -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"default\/whoami:\"<\/span><\/span> -m tcp --dport 31647 -j KUBE-MARK-MASQ\r\n-A KUBE-NODEPORTS -p tcp -m comment --comment <span class=\"token string\"><span class=\"hljs-string\">\"default\/whoami:\"<\/span><\/span> -m tcp --dport 31647 -j KUBE-SVC-OQCLJJ5GLLNFY3XB\r\n<\/code><\/pre>\n<h2 id=\"\u4e0d\u8db3\u4e4b\u5904\">\u4e0d\u8db3\u4e4b\u5904<\/h2>\n<p>\u770b\u8d77\u6765 service \u662f\u4e2a\u5b8c\u7f8e\u7684\u65b9\u6848\uff0c\u53ef\u4ee5\u89e3\u51b3\u670d\u52a1\u8bbf\u95ee\u7684\u6240\u6709\u95ee\u9898\uff0c\u4f46\u662f service \u8fd9\u4e2a\u65b9\u6848\uff08iptables \u6a21\u5f0f\uff09\u4e5f\u6709\u81ea\u5df1\u7684\u7f3a\u70b9\u3002<\/p>\n<p>\u9996\u5148\uff0c\u5982\u679c\u8f6c\u53d1\u7684 pod \u4e0d\u80fd\u6b63\u5e38\u63d0\u4f9b\u670d\u52a1\uff0c\u5b83\u4e0d\u4f1a\u81ea\u52a8\u5c1d\u8bd5\u53e6\u4e00\u4e2a pod\uff0c\u5f53\u7136\u8fd9\u4e2a\u53ef\u4ee5\u901a\u8fc7\u00a0<code>readiness probes<\/code>\u00a0\u6765\u89e3\u51b3\u3002\u6bcf\u4e2a pod \u90fd\u6709\u4e00\u4e2a\u5065\u5eb7\u68c0\u67e5\u7684\u673a\u5236\uff0c\u5f53\u6709 pod \u5065\u5eb7\u72b6\u51b5\u6709\u95ee\u9898\u65f6\uff0ckube-proxy \u4f1a\u5220\u9664\u5bf9\u5e94\u7684\u8f6c\u53d1\u89c4\u5219\u3002<\/p>\n<p>\u53e6\u5916\uff0c<code>nodePort<\/code>\u00a0\u7c7b\u578b\u7684\u670d\u52a1\u4e5f\u65e0\u6cd5\u6dfb\u52a0 TLS \u6216\u8005\u66f4\u590d\u6742\u7684\u62a5\u6587\u8def\u7531\u673a\u5236\u3002<\/p>\n<p><audio style=\"display: none;\" controls=\"controls\"><\/audio><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b80\u4ecb \u5728 kubernetes \u96c6\u7fa4\u4e2d\uff0c\u7f51\u7edc\u662f\u975e\u5e38\u57fa\u7840\u4e5f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u90e8\u5206\u3002\u5bf9\u4e8e\u5927\u89c4\u6a21\u7684\u8282\u70b9\u548c\u5bb9\u5668\u6765\u8bf4\uff0c\u8981\u4fdd\u8bc1\u7f51 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3842","post","type-post","status-publish","format-standard","hentry","category-day"],"_links":{"self":[{"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/posts\/3842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3842"}],"version-history":[{"count":1,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/posts\/3842\/revisions"}],"predecessor-version":[{"id":3844,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=\/wp\/v2\/posts\/3842\/revisions\/3844"}],"wp:attachment":[{"href":"http:\/\/switch.linesno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3842"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/switch.linesno.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}