{"id":478,"date":"2019-10-30T16:00:58","date_gmt":"2019-10-30T08:00:58","guid":{"rendered":"https:\/\/www.myway5.com\/?p=478"},"modified":"2023-07-05T21:38:41","modified_gmt":"2023-07-05T13:38:41","slug":"kubernetes-service","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2019\/10\/30\/kubernetes-service\/","title":{"rendered":"\u7406\u89e3kubernetes service"},"content":{"rendered":"<h2>\u7406\u89e3service\u7684\u89d2\u5ea6<\/h2>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u4e0d\u662f\u5173\u4e8e\u5982\u4f55\u4f7f\u7528kubernetes\u4e2d\u7684service\uff0c\u800c\u662f\u5c1d\u8bd5\u6574\u7406\u6211\u81ea\u5df1\u5bf9service\u7684\u770b\u6cd5\uff0c\u7136\u540e\u52a0\u6df1\u5bf9service\u7684\u7406\u89e3\u3002\u90a3\u4e48\uff0c\u6211\u662f\u4ece\u54ea\u51e0\u4e2a\u89d2\u5ea6\u53bb\u770b\u5f85service\u5462\uff1f<\/p>\n<ul>\n<li>service\u662f\u670d\u52a1\u7684\u7a33\u5b9a\u6027\u4fdd\u8bc1<\/li>\n<li>service\u662f\u96c6\u7fa4\u4e2d\u7684load balance<\/li>\n<li>\u901a\u8fc7\u65e0selector\u7684service\u53bb\u7406\u89e3VIP(\u865a\u62dfip)<\/li>\n<li>service\u7684\u8bbe\u8ba1\uff0c\u548c\u4e0d\u540c\u5b9e\u73b0\u65b9\u5f0f\u7684\u6027\u80fd<\/li>\n<\/ul>\n<h2>service\u662f\u670d\u52a1\u7684\u7a33\u5b9a\u6027\u4fdd\u8bc1<\/h2>\n<p>\u5728k8s\u96c6\u7fa4\u4e2d\uff0c\u65e0\u72b6\u6001\u7684pod\u526f\u672c\u662f\u53ef\u4ee5\u968f\u65f6\u5220\u9664\u3001\u968f\u65f6\u521b\u5efa\u7684\uff0c\u5e76\u4e14\u91cd\u65b0\u521b\u5efa\u7684pod\u4e0d\u518d\u4fdd\u7559\u65e7\u7684pod\u7684\u4efb\u4f55\u4fe1\u606f\uff0c\u5305\u62ecip\u5730\u5740\u3002\u5728\u8fd9\u6837\u7684\u60c5\u51b5\u4e0b\uff0c\u524d\u7aef\u5e94\u7528\u5982\u4f55\u4f7f\u7528\u540e\u7aef\u7684\u8fd9\u4e9bpod\u6765\u63d0\u4f9b\u670d\u52a1\u5c31\u6210\u4e86\u95ee\u9898\uff0c\u56e0\u6b64k8s\u5b9e\u73b0\u4e86service\u8fd9\u6837\u4e00\u4e2a\u62bd\u8c61\u7684\u6982\u5ff5\u3002\u5bf9\u4e8e\u6709selector\u7684service\uff0c\u5b83\u5728\u88ab\u521b\u5efa\u7684\u65f6\u5019\u4f1a\u81ea\u52a8\u521b\u5efaendpoint\u8d44\u6e90\uff0c\u8fd9\u4e2aendpoint\u4e2d\u5305\u542b\u4e86\u6240\u6709\u7684pod\u7684ip\u548c\u7aef\u53e3\uff0c\u5e76\u4e14\u5728\u4e4b\u540e\u7684pod\u7684\u5220\u9664\u3001\u521b\u5efa\u4e2d\uff0c\u8fd9\u4e2aendpoint\u4e2d\u4f1a\u7acb\u5373\u66f4\u65b0\u76f8\u5173pod\u7684ip\u548c\u7aef\u53e3\u4fe1\u606f\u3002\u540c\u65f6\uff0cservice\u7684ip\u5730\u5740\u662f\u6c38\u8fdc\u56fa\u5b9a\u7684\uff0cservice\u548cendpoint\u662f\u4e00\u4e00\u5bf9\u5e94\u7684\u5173\u7cfb\u3002\u8fd9\u6837\uff0c\u5982\u679c\u524d\u7aef\u5e94\u7528\u901a\u8fc7\u56fa\u5b9a\u7684service ip\u6765\u8bbf\u95eepod\u63d0\u4f9b\u7684\u670d\u52a1\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u5728endpoint\u4e2d\u627e\u5230\u4e00\u4e2a\u53ef\u7528\u7684pod\u7684ip\u548c\u7aef\u53e3\uff0c\u7136\u540e\u901a\u8fc7\u4e00\u4e9b\u64cd\u4f5c\uff08\u8fd9\u4e2a\u5728\u540e\u9762\u4f1a\u6574\u7406\uff09\u5c06\u6570\u636e\u5305\u8f6c\u53d1\u5230\u6307\u5b9a\u7684pod\u4e0a\u5373\u53ef\u3002<\/p>\n<pre><code class=\"line-numbers\"># \u4f60\u53ef\u4ee5\u901a\u8fc7kubectl\u67e5\u770bservice\u548cendpoint\u6765\u52a0\u6df1\u7406\u89e3\n\n<span class=\"katex math inline\">kubectl -n h2o describe svc h2o\n\nName:              h2o\nNamespace:         h2o\nLabels:            app=h2o\nAnnotations:       kubectl.kubernetes.io\/last-applied-configuration:\n                     {\"apiVersion\":\"v1\",\"kind\":\"Service\",\"metadata\":{\"annotations\":{},\"labels\":{\"app\":\"h2o\"},\"name\":\"h2o\",\"namespace\":\"h2o\"},\"spec\":{\"clusterIP...\nSelector:          app=h2o\nType:              ClusterIP\nIP:                None\nPort:              web  54321\/TCP\nTargetPort:        54321\/TCP\nEndpoints:         10.42.1.33:54321,10.42.2.139:54321\nSession Affinity:  None\nEvents:            &lt;none&gt;<\/span> kubectl -n h2o get endpoints h2o\nNAME   ENDPOINTS                            AGE\nh2o    10.42.1.33:54321,10.42.2.139:54321   4h45m\n\n<\/code><\/pre>\n<p>service\u901a\u8fc7ip\u5730\u5740\u7684\u56fa\u5b9a\u6765\u4fdd\u8bc1\u670d\u52a1\u7684\u7a33\u5b9a\u6027\u3002\u90a3\u4e3a\u5565service\u5c31\u662f\u53ef\u4ee5\u56fa\u5b9a\u4e0d\u53d8\u7684\u5462\uff1f\u8fd9\u662f\u56e0\u4e3aservice\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u62bd\u8c61\u7684\u6982\u5ff5\u554a\uff0c\u5b83\u4e0d\u662f\u4e00\u4e2a\u6b63\u5728\u8fd0\u884c\u7684\u8fdb\u7a0b\uff0c\u53ea\u662f\u4e00\u6761\u6570\u636e\uff0c\u4e5f\u6b63\u56e0\u4e3a\u5982\u6b64\uff0c\u5b83\u7684ip\u5730\u5740\u548c\u7aef\u53e3\u53f7\u4e5f\u662f\u4e0d\u5b58\u5728\u7684\uff0c\u8fd9\u4e9b\u90fd\u662f\u5b58\u50a8\u5728etcd\u4e2d\u7684\u4e00\u6761\u6570\u636e\u3002\u90a3\u4e48k8s\u662f\u5982\u4f55\u901a\u8fc7\u8fd9\u6837\u4e00\u4e2a\u865a\u5047\u7684ip\u548c\u7aef\u53e3\u5c06\u8bf7\u6c42\u8f6c\u53d1\u5230\u771f\u5b9e\u5b58\u5728\u7684pod\u4e2d\u5462\uff1f\u8fd9\u5c31\u662f\u540e\u9762\u8981\u8bf4\u7684\u5185\u5bb9\u4e86\u3002<\/p>\n<h2>service\u662f\u96c6\u7fa4\u4e2d\u7684load balance<\/h2>\n<p>\u5728\u4e0a\u4e00\u8282\u8bf4\u5230\uff0c\u4e00\u4e2aservice\u4f1a\u5bf9\u5e94\u4e00\u4e2aendpoint\uff0c\u8fd9\u4e2aendpoint\u4e2d\u4f1a\u4fdd\u5b58\u6240\u6709\u5f53\u524d\u5339\u914d\u5230\u7684pod\u7684ip\u548c\u7aef\u53e3\u53f7\u3002\u90a3\u4e48\u73b0\u5728\u6709\u4e00\u4e2ahttp\u8bf7\u6c42\u8fc7\u6765\u4e86\uff0c\u53d1\u73b0endpoint\u4e2d\u6709\u4e09\u4e2a\u5f85\u9009\u7684pod\uff0c\u90a3\u4e48\u6211\u4eec\u4f7f\u7528\u4e00\u5b9a\u7684\u65b9\u5f0f\u6bd4\u8f83\u516c\u5e73\u7684\u9009\u62e9\u51fa\u4e00\u4e2apod\uff0c\u5c31\u8f7b\u677e\u7684\u8fbe\u5230\u4e86\u8d1f\u8f7d\u5747\u8861\u7684\u6548\u679c\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2019\/10\/service-loadbalance.png\" alt=\"service load balance\" \/><\/p>\n<p>\u90a3\u4e48k8s\u4e2d\uff0cload balance\u7684\u7b56\u7565\u662f\u4ec0\u4e48\u6837\u7684\u5462\uff1f\u56e0\u4e3a\u4e0d\u540c\u7684service\u5b9e\u73b0\u65b9\u5f0f\u4f7f\u7528\u7684\u65b9\u6cd5\u4e0d\u540c\uff0c\u8fd9\u4e2a\u5185\u5bb9\u4f1a\u5728\u540e\u9762\u6574\u7406\u3002<\/p>\n<h2>\u901a\u8fc7\u65e0selector\u7684service\u53bb\u7406\u89e3VIP(\u865a\u62dfip)<\/h2>\n<p>\u5728\u524d\u9762\u7684\u5185\u5bb9\u4e2d\uff0cservice\u4e00\u76f4\u548cendpoint\u3001pod\u5173\u8054\u5728\u4e00\u8d77\uff0c\u90a3\u4e48\u5982\u679c\u6211\u4eec\u7684service\u6ca1\u6709selector\uff0c\u5c31\u4e0d\u4f1a\u521b\u5efaendpoint\u4e86\uff0c\u4e5f\u4e0d\u4f1a\u5173\u8054pod\u3002\u524d\u9762\u4e5f\u63d0\u5230\u4e86service\u662f\u4e00\u4e2a\u62bd\u8c61\u7684\u6982\u5ff5\uff0c\u5176\u62e5\u6709\u7684ip\u548cport\u90fd\u662f\u5047\u7684\u3002\u5176\u5b9e\u8fd9\u4e2a\u53eb\u505aVIP(virtual ip)\u3002\u90a3\u4e48\uff0c\u5982\u4f55\u901a\u8fc7\u65e0selector\u7684service\u6765\u7406\u89e3VIP\u5462\uff1f<\/p>\n<p>\u5728k8s\u4e2d\u521b\u5efa\u65e0selector service\u7684\u65f6\u5019\uff0c\u4e0d\u4f1a\u81ea\u52a8\u521b\u5efa\u5173\u8054\u7684endpoint\uff0c\u66f4\u4e0d\u4f1a\u53bb\u5339\u914dpod\u4e86\u3002\u4f46\u662f\u8fd9\u6837\u7684service\u4ecd\u7136\u662f\u62e5\u6709ip\u548cport\u7684\u3002\u6211\u4eec\u53ef\u4ee5\u5c1d\u8bd5\u4e00\u4e0b\uff1a<\/p>\n<p>svc-without-selector.yaml<\/p>\n<pre><code class=\"line-numbers\">apiVersion: v1\nkind: Service\nmetadata:\n  name: my-service\nspec:\n  ports:\n    - protocol: TCP\n      port: 8081\n      targetPort: 8081\n<\/code><\/pre>\n<pre><code class=\"line-numbers\">kubectl apply -f svc-without-selector.yaml\n<\/code><\/pre>\n<p>\u67e5\u770b\u4e00\u4e0b\u8fd9\u4e2asvc\u7684\u8be6\u60c5:<\/p>\n<pre><code class=\"line-numbers\">$ kubectl describe svc my-service\n\nName:              my-service\nNamespace:         default\nLabels:            &lt;none&gt;\nAnnotations:       kubectl.kubernetes.io\/last-applied-configuration:\n                     {\"apiVersion\":\"v1\",\"kind\":\"Service\",\"metadata\":{\"annotations\":{},\"name\":\"my-service\",\"namespace\":\"default\"},\"spec\":{\"ports\":[{\"port\":8081,...\nSelector:          &lt;none&gt;\nType:              ClusterIP\nIP:                10.43.12.208\nPort:              &lt;unset&gt;  8081\/TCP\nTargetPort:        8081\/TCP\nEndpoints:         &lt;none&gt;\nSession Affinity:  None\nEvents:            &lt;none&gt;\n<\/code><\/pre>\n<p>\u9664\u4e86\u62e5\u6709ip\u548c\u7aef\u53e3\u53f7\uff0c\u5c31\u4ec0\u4e48\u90fd\u6ca1\u6709\u4e86\u3002\u8fd9\u5c31\u662f\u8bf4service\u4e3a\u4ec0\u4e48\u5c31\u662f\u4e00\u6761\u6570\u636e\u7684\u539f\u56e0\uff0c10.43.12.208\u4e5f\u5c31\u662f\u4e00\u4e2aVIP\u3002<\/p>\n<p>\u5bf9\u4e8e\u65e0selector\u7684service\u8fd8\u6709\u4e00\u4e2a\u7528\u5904\uff0c\u5c31\u662f\u8ba9\u96c6\u7fa4\u5185\u90e8\u7684\u5e94\u7528\u53ef\u4ee5\u7a33\u5b9a\u7684\u8bbf\u95ee\u5230\u96c6\u7fa4\u5916\u90e8\u7684\u670d\u52a1\u3002\u56e0\u4e3aservice\u662f\u7a33\u5b9a\u7684\uff0c\u90a3\u4e48\u96c6\u7fa4\u5185\u90e8\u90fd\u53ef\u4ee5\u8bbf\u95ee\u8fd9\u4e2aservice\uff0c\u7136\u540e\u8ba9\u8fd9\u4e2aservice\u5c06\u8bf7\u6c42\u8f6c\u53d1\u5230\u96c6\u7fa4\u5916\u3002<\/p>\n<p>\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u624b\u52a8\u521b\u5efa\u4e00\u4e2aendpoint\uff0c\u8fd9\u4e2aendpoint\u5305\u542b\u4e86\u96c6\u7fa4\u5916\u7684\u4e24\u4e2ahttp\u670d\u52a1<\/p>\n<pre><code class=\"line-numbers\">apiVersion: v1\nkind: Endpoints\nmetadata:\n  name: my-service\nsubsets:\n  - addresses:\n      - ip: 192.168.50.99\n      - ip: 192.168.50.201\n    ports:\n      - port: 8081\n<\/code><\/pre>\n<p>\u7136\u540e\u6211\u4eec\u5148\u68c0\u67e5\u4e00\u4e0bservice\uff0c\u53d1\u73b0endpoints\u5df2\u7ecf\u66f4\u65b0\u4e86\u3002<\/p>\n<pre><code class=\"line-numbers\">$ kubectl describe svc my-service\n\nName:              my-service\nNamespace:         default\nLabels:            &lt;none&gt;\nAnnotations:       kubectl.kubernetes.io\/last-applied-configuration:\n                     {\"apiVersion\":\"v1\",\"kind\":\"Service\",\"metadata\":{\"annotations\":{},\"name\":\"my-service\",\"namespace\":\"default\"},\"spec\":{\"ports\":[{\"port\":8081,...\nSelector:          &lt;none&gt;\nType:              ClusterIP\nIP:                10.43.12.208\nPort:              &lt;unset&gt;  8081\/TCP\nTargetPort:        8081\/TCP\nEndpoints:         192.168.50.201:8081,192.168.50.99:8081\nSession Affinity:  None\nEvents:            &lt;none&gt;\n\n<\/code><\/pre>\n<p>\u6211\u4eec\u5728\u96c6\u7fa4\u5185\u90e8\u8bbf\u95ee\u4e00\u4e0b(\u4f7f\u7528kubectl exec\u5230\u4e00\u4e2apod\u4e0a):<\/p>\n<pre><code class=\"line-numbers\">$ wget my-service:8081 -q -O out | cat out\nserver 2\n$ wget my-service:8081 -q -O out | cat out\nserver 1\n$ wget my-service:8081 -q -O out | cat out\nserver 2\n$ wget my-service:8081 -q -O out | cat out\nserver 1\n<\/code><\/pre>\n<h2>service\u7684\u8bbe\u8ba1\uff0c\u548c\u4e0d\u540c\u5b9e\u73b0\u65b9\u5f0f\u7684\u6027\u80fd<\/h2>\n<p>service\u7684\u8bbe\u8ba1\u662f\u4ee5\u63d0\u9ad8\u6027\u80fd\u4e3a\u524d\u63d0\u4e0d\u65ad\u7684\u6f14\u8fdb\u7684\uff0c\u8fd9\u91cc\u662f\u5173\u4e8eService\u7684\u8bbe\u8ba1\u8ba8\u8bba: <a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/github.com\/kubernetes\/kubernetes\/issues\/1107\">DESIGN: Services v2<\/a>\u3002\u611f\u5174\u8da3\u7684\u8fd8\u53ef\u4ee5\u770b\u770bk8s-release-v1.0\u7684\u65f6\u5019\u5bf9service\u7684\u63cf\u8ff0: <a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/github.com\/kubernetes\/kubernetes\/blob\/release-1.0\/docs\/user-guide\/services.md\">Service<\/a><\/p>\n<p>service\u7684\u8bbe\u8ba1\u4e2d\u67094\u4e2a\u89d2\u8272: Pod\u3001 Service\u3001Ambassador\u3001Portal<\/p>\n<ul>\n<li>Pod: k8s\u96c6\u7fa4\u4e2d\u7684\u6700\u5c0f\u8c03\u5ea6\u5355\u4f4d\uff0c\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u5bb9\u5668<\/li>\n<li>Service: \u4e00\u7ec4pod\u7684\u96c6\u5408\uff0c\u7531\u6807\u7b7e\u9009\u62e9\u5668\u6765\u5173\u8054<\/li>\n<li>Ambassador: \u4e2d\u6587\u7ffb\u8bd1\u662f<code>\u5927\u4f7f<\/code>\uff0c\u662f\u4e00\u6bb5\u53ef\u6267\u884c\u7684\u903b\u8f91\uff0c\u5b83\u8d1f\u8d23\u5b9e\u73b0\u5ba2\u6237\u7aef\u8bbf\u95eeService\uff0c\u7136\u540e\u5c06\u8bf7\u6c42\u8f6c\u53d1\u5230\u4e00\u4e2a\u5bf9\u5e94\u7684Pod\u4e0a\u3002\u8fd9\u4e2aAmbassador\u53ef\u4ee5\u662f\u4e00\u4e2a\u4e91\u670d\u52a1\u5546\u7684\u670d\u52a1\uff0c\u4e5f\u53ef\u4ee5\u662f\u4e00\u4e2a\u5355\u72ec\u7684pod(\u6bd4\u5982haproxy)\uff0c\u6216\u8005\u662f\u6bcf\u4e2a\u8282\u70b9\u90fd\u6709\u7684\u5171\u4eab\u8fdb\u7a0b(kube-proxy)\u3002<\/li>\n<li>Portal: \u56fa\u5b9a\u7684ip:port\u5bf9\uff0c\u5ba2\u6237\u7aef\u53ea\u8981\u8bbf\u95ee\u8fd9\u4e2aPortal\uff0c\u8bf7\u6c42\u81ea\u7136\u4f1a\u88ab\u8f6c\u53d1\u5230Ambassador\u4e0a\uff0c\u5ba2\u6237\u7aef\u4e0d\u9700\u8981\u7406\u89e3Ambassador\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<p>\u6700\u521d\u7684\u8bbe\u8ba1\u4e2d\u662f\u6709\u4e09\u79cd\u65b9\u6848\uff0c<\/p>\n<p><strong>\u65b9\u6848\u4e00<\/strong>: \u6bcf\u4e2a\u670d\u52a1\u4e00\u4e2aip\uff0c\u5171\u4eab\u7684<code>Ambassador<\/code>\u3002\u8fd9\u4e2aip\u5c31\u662f\u4e0a\u9762\u8bf4\u7684<code>Portal<\/code> ip\u3002\u5c06\u670d\u52a1\u4ee5\u53caip\u3001\u7aef\u53e3\u5e7f\u64ad\u7ed9\u6240\u6709\u7684<code>kube-proxy<\/code>\u5b9e\u4f8b\u3002<code>kube-proxy<\/code>\u8bbe\u7f6e\u597diptables\u6765\u201c\u7a83\u53d6\u201d\u6240\u6709\u5230<code>Portal(ip,port)<\/code>\u7684\u8bf7\u6c42\uff0c\u7136\u540e\u5c06\u8fd9\u4e2a\u8bf7\u6c42\u8f6c\u53d1\u5230\u81ea\u5df1\u7684\u67d0\u4e2a\u7aef\u53e3\u4e0a\u3002\u8fd9\u91cc<code>kube-proxy<\/code>\u626e\u6f14\u7684\u662f<code>Ambassador<\/code>\u89d2\u8272\uff0c\u5b83\u4f1a\u4f7f\u7528<code>round-robin<\/code>\u7684\u65b9\u6cd5\u6765\u628a\u8bf7\u6c42\u5747\u8861\u7684\u5206\u53d1\u5230Service\u540e\u9762\u7684Pod\u4e0a\u3002\u8fd9\u4e2a\u65b9\u6848\u91cc\uff0c\u6709\u4ee5\u4e0b\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\uff1a<\/p>\n<p><strong>\u4f18\u70b9\uff1a<\/strong><br \/>\n  &#8211; \u4e0d\u4f1a\u6709\u7aef\u53e3\u51b2\u7a81<br \/>\n  &#8211; Service\u7684ip\u548cport\u90fd\u662f\u56fa\u5b9a\u7684\uff0c\u65b9\u4fbf\u505aDNS A (forward) \u548c PTR (reverse)\u548c SRV \u8bb0\u5f55\u3002<br \/>\n  &#8211; iptables\u53ef\u4ee5\u653e\u5728<code>root namespace<\/code>\uff0c\u5373\u4f7fpods\u91cd\u542f\u4e86\u4e5f\u4e0d\u9700\u8981\u66f4\u65b0iptables(\u8fd9\u662f\u56e0\u4e3aiptables\u662f\u8d1f\u8d23\u5c06\u5230service ip:port\u7684\u6d41\u91cf\u8f6c\u53d1\u5230kube-proxy\u7684\u4e00\u4e2a\u7aef\u53e3\u4e0a\u5373\u53ef)\u3002<br \/>\n  &#8211; \u4e0d\u9700\u8981\u5728pod\u4e0a\u9884\u5148\u58f0\u660e\u9700\u8981\u7684Service\u3002<\/p>\n<p><strong>\u7f3a\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>kube-proxy\u662f\u591a\u79df\u6237\u7684(\u9700\u8981\u4e3a\u6240\u6709\u7684service\u505a\u6d41\u91cf\u8f6c\u53d1)<\/li>\n<li>\u4ecekube-proxy\u8f6c\u53d1\u7684\u6d41\u91cf\u7684\u6e90ip\u4e0d\u662f\u771f\u5b9e\u7684\u6e90ip\uff0c<\/li>\n<li>\u9700\u8981\u4e3aportal\u9884\u7559\u865a\u62dfip\u7a7a\u95f4<\/li>\n<li>\u9700\u8981master\u8ddf\u8e2a\u548c\u68c0\u67e5\u6240\u6709\u7684portal ip<\/li>\n<li>\u5f53service\u6570\u91cf\u7ea7\u4e0a\u5343\u540e\u53ef\u6269\u5c55\u6027\u4e0d\u9ad8<\/li>\n<\/ul>\n<p><strong>\u65b9\u6848\u4e8c<\/strong>\uff1a \u6bcf\u4e2a\u670d\u52a1\u4e00\u4e2aip\uff0c\u79c1\u6709\u7684<code>Ambassador<\/code>\u3002\u5bf9\u6bcf\u4e2apod\u6765\u8bf4\uff0c\u90fd\u6709\u4e00\u4e2a<em>\u79c1\u6709<\/em>\u7684\u7684ambassador\uff0c\u8fd9\u8981\u6c42pod\u9700\u8981\u5148\u58f0\u660e\u5b83\u4eec\u60f3\u5148\u8bbf\u95ee\u90a3\u4e2a\u670d\u52a1\uff08\u5426\u5219\u7684\u8bdd\uff0c\u5bf9\u4e8e\u96c6\u7fa4\u4e2d\u7684\u6bcf\u6b21Service\u7684\u6dfb\u52a0\u548c\u5220\u9664\uff0c\u90fd\u9700\u8981<code>kubelet<\/code>\u6216\u5176\u4ed6\u7684root-namespace\u3001true-root\u7684\u7528\u6237\u4ee3\u7406\u53d8\u52a8\u5230\u6bcf\u4e2apod\u7684namespace\u4e0b\u3002[iptables\u89c4\u5219\u9700\u8981root\u7528\u6237])\uff0c\u8fd9\u6837\u624d\u80fd\u5728pod\u7684\u547d\u540d\u7a7a\u95f4\u4e0b\u5efa\u7acbiptables\u89c4\u5219\u3002<\/p>\n<p><strong>\u4f18\u70b9:<\/strong><\/p>\n<ul>\n<li>\u4e0d\u4f1a\u6709\u7aef\u53e3\u51b2\u7a81<\/li>\n<li>Service\u7684ip\u548cport\u90fd\u662f\u56fa\u5b9a\u7684\uff0c\u65b9\u4fbf\u505aDNS A (forward) \u548c PTR (reverse)\u548c SRV \u8bb0\u5f55\u3002<\/li>\n<li>\u4ee3\u7406\u4e0d\u662f\u591a\u79df\u6237\u7684<\/li>\n<li>\u4ecekube-proxy\u8f6c\u53d1\u7684\u6d41\u91cf\u7684\u6e90ip\u662f\u771f\u5b9e\u7684\u6e90ip\uff0c<\/li>\n<li>\u5bb9\u6613\u4ece\u65b9\u6848\u4e00\u8fc1\u79fb<\/li>\n<li>\u9700\u8981pod\u9884\u5148\u58f0\u660e\u670d\u52a1\uff08\u7ed3\u6784\u826f\u597d)<\/li>\n<\/ul>\n<p><strong>\u7f3a\u70b9:<\/strong><\/p>\n<ul>\n<li>iptables\u662f\u914d\u7f6e\u5728pod\u7684namespace\u4e0b\uff0c\u4f46\u662fpod\u7684\u547d\u540d\u7a7a\u95f4\u91cd\u542f\u4e86\u5c31\u5fc5\u987b\u91cd\u65b0\u8fd0\u884c\u4e00\u6b21<\/li>\n<li>\u9700\u8981\u4e3aportal\u9884\u7559\u865a\u62dfip\u7a7a\u95f4<\/li>\n<li>\u9700\u8981master\u8ddf\u8e2a\u548c\u68c0\u67e5\u6240\u6709\u7684portal ip<\/li>\n<li>\u9700\u8981pod\u9884\u5148\u58f0\u660e\u670d\u52a1\uff08\u76ee\u524d\u8fd8\u6ca1\u5b9e\u73b0\uff09<\/li>\n<\/ul>\n<p><strong>\u65b9\u6848\u4e09<\/strong>\uff1alocalhost\u7684portal\uff0c\u79c1\u6709\u7684ambassador<\/p>\n<p>\u4e0d\u540c\u4e8e\u7ed9service\u5206\u914dip\uff0c\u800c\u662f\u4f7f\u7528\u672c\u5730\u7684\u7aef\u53e3\u53f7\u4f5c\u4e3aportal\u3002<\/p>\n<p>\u4ecb\u7ecd\u5b8c\u8fd9\u4e09\u79cd\u65b9\u6848\u540e\uff0c\u5c31\u53ef\u4ee5\u5f15\u5165service\u6700\u7ec8\u7684\u6f14\u8fdb\u4e86: userspace->iptables->ipvs\u3002<\/p>\n<p>\u8fd9\u91cc\u5148\u653e\u4e00\u5f20iptables\u7684\u5de5\u4f5c\u6d41\u7a0b\u56fe\uff0c\u65b9\u4fbf\u7406\u89e3\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2019\/10\/iptables\u7ed3\u6784\u56fe.png\" alt=\"iptables\" \/><\/p>\n<p><strong>userspace\u6a21\u5f0f<\/strong><\/p>\n<p>\u8fd9\u91cc\u7684userspace\u5c31\u662f\u65b9\u6848\u4e00\u7684\u5b9e\u73b0\uff0c\u5728k8s 1.0\u7684\u53d1\u5e03\u4e2d\u6b63\u5f0f\u542f\u7528\u3002userspace\u7684\u5de5\u4f5c\u539f\u7406\u56fe\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2019\/10\/services-userspace-overview.svg\" alt=\"userspace service overview\" \/><\/p>\n<p>\u8fd9\u79cd\u6a21\u5f0f\uff0ckube-proxy \u4f1a\u76d1\u89c6 Kubernetes master \u5bf9 Service \u5bf9\u8c61\u548c Endpoints \u5bf9\u8c61\u7684\u6dfb\u52a0\u548c\u79fb\u9664\u3002 \u5bf9\u6bcf\u4e2a Service\uff0c\u5b83\u4f1a\u5728\u672c\u5730 Node \u4e0a\u6253\u5f00\u4e00\u4e2a\u7aef\u53e3\uff08\u968f\u673a\u9009\u62e9\uff09\u3002 \u4efb\u4f55\u8fde\u63a5\u5230\u201c\u4ee3\u7406\u7aef\u53e3\u201d\u7684\u8bf7\u6c42\uff0c\u90fd\u4f1a\u88ab\u4ee3\u7406\u5230 Service \u7684backend Pods \u4e2d\u7684\u67d0\u4e2a\u4e0a\u9762\uff08\u5982 Endpoints \u6240\u62a5\u544a\u7684\u4e00\u6837\uff09\u3002 \u4f7f\u7528\u54ea\u4e2a backend Pod\uff0c\u662f kube-proxy \u57fa\u4e8e SessionAffinity \u6765\u786e\u5b9a\u7684\u3002<\/p>\n<p>\u6700\u540e\uff0c\u5b83\u5b89\u88c5 iptables \u89c4\u5219\uff0c\u6355\u83b7\u5230\u8fbe\u8be5 Service \u7684 clusterIP\uff08\u662f\u865a\u62df IP\uff09\u548c Port \u7684\u8bf7\u6c42\uff0c\u5e76\u91cd\u5b9a\u5411\u5230\u4ee3\u7406\u7aef\u53e3\uff0c\u4ee3\u7406\u7aef\u53e3\u518d\u4ee3\u7406\u8bf7\u6c42\u5230 backend Pod\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u7528\u6237\u7a7a\u95f4\u6a21\u5f0f\u4e0b\u7684kube-proxy\u901a\u8fc7<code>round-robin<\/code>\u9009\u62e9\u540e\u7aef\u3002<\/p>\n<p>\u8fd9\u91cc\u6709\u4e00\u4e2a\u95ee\u9898\u5728\u4e8e\uff0cclient\u8bbf\u95eeservice\u7684clusterIP\u65f6\uff0ciptables\u4f1a\u628a\u6d41\u91cf\u8f6c\u53d1\u5230kube-proxy\u7684\u67d0\u4e2a\u7aef\u53e3\u4e0a\uff0c\u8fd9\u6837\u7684\u8bdd\uff0c\u6bcf\u6b21\u8f6c\u53d1\u90fd\u6709\u4e00\u4e2a<code>\u5185\u6838\u6001<\/code>\u5230<code>\u7528\u6237\u6001<\/code>\u7684\u8f6c\u6362\u3002<\/p>\n<p><strong>iptables\u6a21\u5f0f<\/strong><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2019\/10\/services-iptables-overview.svg\" alt=\"iptables service overview\" \/><\/p>\n<p>\u8fd9\u79cd\u6a21\u5f0f\uff0ckube-proxy \u4f1a\u76d1\u89c6 Kubernetes \u63a7\u5236\u8282\u70b9\u5bf9 Service \u5bf9\u8c61\u548c Endpoints \u5bf9\u8c61\u7684\u6dfb\u52a0\u548c\u79fb\u9664\u3002 \u5bf9\u6bcf\u4e2a Service\uff0c\u5b83\u4f1a\u5b89\u88c5 iptables \u89c4\u5219\uff0c\u4ece\u800c\u6355\u83b7\u5230\u8fbe\u8be5 Service \u7684 clusterIP \u548c\u7aef\u53e3\u7684\u8bf7\u6c42\uff0c\u8fdb\u800c\u5c06\u8bf7\u6c42\u91cd\u5b9a\u5411\u5230 Service \u7684\u4e00\u7ec4 backend \u4e2d\u7684\u67d0\u4e2a\u4e0a\u9762\u3002 \u5bf9\u4e8e\u6bcf\u4e2a Endpoints \u5bf9\u8c61\uff0c\u5b83\u4e5f\u4f1a\u5b89\u88c5 iptables \u89c4\u5219\uff0c\u8fd9\u4e2a\u89c4\u5219\u4f1a\u9009\u62e9\u4e00\u4e2a backend \u7ec4\u5408\u3002<\/p>\n<p>\u9ed8\u8ba4\u7684\u7b56\u7565\u662f\uff0ckube-proxy \u5728 iptables \u6a21\u5f0f\u4e0b\u968f\u673a\u9009\u62e9\u4e00\u4e2a backend\u3002\u7c7b\u4f3c\u4e8e\u8fd9\u6837<\/p>\n<pre><code class=\"line-numbers\">iptables -t nat -A PREROUTING -p tcp -d 15.45.23.67 --dport 80 -j DNAT --to-destination 192.168.1.1-192.168.1.10\n<\/code><\/pre>\n<p>\u4f7f\u7528 iptables \u5904\u7406\u6d41\u91cf\u5177\u6709\u8f83\u4f4e\u7684\u7cfb\u7edf\u5f00\u9500\uff0c\u56e0\u4e3a\u6d41\u91cf\u7531 Linux netfilter \u5904\u7406\uff0c\u800c\u65e0\u9700\u5728\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u4e4b\u95f4\u5207\u6362\u3002 \u8fd9\u79cd\u65b9\u6cd5\u4e5f\u53ef\u80fd\u66f4\u53ef\u9760\u3002<\/p>\n<p>\u5982\u679c kube-proxy \u5728 iptable s\u6a21\u5f0f\u4e0b\u8fd0\u884c\uff0c\u5e76\u4e14\u6240\u9009\u7684\u7b2c\u4e00\u4e2a Pod \u6ca1\u6709\u54cd\u5e94\uff0c\u5219\u8fde\u63a5\u5931\u8d25\u3002 \u8fd9\u4e0e\u7528\u6237\u7a7a\u95f4\u6a21\u5f0f\u4e0d\u540c\uff1a\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0ckube-proxy \u5c06\u68c0\u6d4b\u5230\u4e0e\u7b2c\u4e00\u4e2a Pod \u7684\u8fde\u63a5\u5df2\u5931\u8d25\uff0c\u5e76\u4f1a\u81ea\u52a8\u4f7f\u7528\u5176\u4ed6\u540e\u7aef Pod \u91cd\u8bd5\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528 Pod readiness \u63a2\u6d4b\u5668 \u9a8c\u8bc1\u540e\u7aef Pod \u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\uff0c\u4ee5\u4fbf iptables \u6a21\u5f0f\u4e0b\u7684 kube-proxy \u4ec5\u770b\u5230\u6d4b\u8bd5\u6b63\u5e38\u7684\u540e\u7aef\u3002 \u8fd9\u6837\u505a\u610f\u5473\u7740\u60a8\u907f\u514d\u5c06\u6d41\u91cf\u901a\u8fc7 kube-proxy \u53d1\u9001\u5230\u5df2\u77e5\u5df2\u5931\u8d25\u7684Pod\u3002<\/p>\n<p><strong>ipvs\u6a21\u5f0f<\/strong><\/p>\n<p>ipvs\u662f\u5728Kubernetes v1.11\u6b63\u5f0f\u53ef\u7528\u7684\u3002ipvs\u4e5f\u662f\u4f9d\u8d56\u4e8eiptables\u7684\uff0c\u4f46\u662f\u5b83\u7684\u6027\u80fd\u66f4\u9ad8\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.myway5.com\/wp-content\/uploads\/2019\/10\/services-ipvs-overview.svg\" alt=\"ipvs service overview\" \/><\/p>\n<p>\u5728ipvs\u6a21\u5f0f\u4e0b\uff0ckube-proxy\u76d1\u89c6Kubernetes\u670d\u52a1\u548c\u7aef\u70b9\uff0c\u8c03\u7528netlink\u63a5\u53e3\u76f8\u5e94\u5730\u521b\u5efaIPVS\u89c4\u5219\uff0c\u5e76\u5b9a\u671f\u5c06IPVS\u89c4\u5219\u4e0eKubernetes\u670d\u52a1\u548c\u7aef\u70b9\u540c\u6b65\u3002\u8be5\u63a7\u5236\u5faa\u73af\u53ef\u786e\u4fddIPVS\u72b6\u6001\u4e0e\u6240\u9700\u72b6\u6001\u5339\u914d\u3002\u8bbf\u95ee\u670d\u52a1\u65f6\uff0cIPVS\u3000\u5c06\u6d41\u91cf\u5b9a\u5411\u5230\u540e\u7aefPod\u4e4b\u4e00\u3002<\/p>\n<p>IPVS\u4ee3\u7406\u6a21\u5f0f\u57fa\u4e8e\u7c7b\u4f3c\u4e8eiptables\u6a21\u5f0f\u7684netfilter\u6302\u94a9\u51fd\u6570\uff0c\u4f46\u662f\u4f7f\u7528\u54c8\u5e0c\u8868\u4f5c\u4e3a\u57fa\u7840\u6570\u636e\u7ed3\u6784\uff0c\u5e76\u4e14\u5728\u5185\u6838\u7a7a\u95f4\u4e2d\u5de5\u4f5c\u3002 \u8fd9\u610f\u5473\u7740\uff0c\u4e0eiptables\u6a21\u5f0f\u4e0b\u7684 kube-proxy \u76f8\u6bd4\uff0cIPVS \u6a21\u5f0f\u4e0b\u7684 kube-proxy \u91cd\u5b9a\u5411\u901a\u4fe1\u7684\u5ef6\u8fdf\u8981\u77ed\uff0c\u5e76\u4e14\u5728\u540c\u6b65\u4ee3\u7406\u89c4\u5219\u65f6\u5177\u6709\u66f4\u597d\u7684\u6027\u80fd\u3002\u4e0e\u5176\u4ed6\u4ee3\u7406\u6a21\u5f0f\u76f8\u6bd4\uff0cIPVS \u6a21\u5f0f\u8fd8\u652f\u6301\u66f4\u9ad8\u7684\u7f51\u7edc\u6d41\u91cf\u541e\u5410\u91cf\u3002<\/p>\n<p>IPVS\u63d0\u4f9b\u4e86\u66f4\u591a\u9009\u9879\u6765\u5e73\u8861\u540e\u7aefPod\u7684\u6d41\u91cf\u3002 \u8fd9\u4e9b\u662f\uff1a<\/p>\n<ul>\n<li>rr: round-robin<\/li>\n<li>lc: least connection (smallest number of open connections)<\/li>\n<li>dh: destination hashing<\/li>\n<li>sh: source hashing<\/li>\n<li>sed: shortest expected delay<\/li>\n<li>nq: never queue<\/li>\n<\/ul>\n<blockquote><p>\n  \u6ce8\u610f\uff1a<br \/>\n  \u8981\u5728IPVS\u6a21\u5f0f\u4e0b\u8fd0\u884ckube-proxy\uff0c\u5fc5\u987b\u5728\u542f\u52a8kube-proxy\u4e4b\u524d\u4f7fIPVS Linux\u5728\u8282\u70b9\u4e0a\u53ef\u7528\u3002<\/p>\n<p>  \u5f53 kube-proxy \u4ee5 IPVS \u4ee3\u7406\u6a21\u5f0f\u542f\u52a8\u65f6\uff0c\u5b83\u5c06\u9a8c\u8bc1 IPVS \u5185\u6838\u6a21\u5757\u662f\u5426\u53ef\u7528\u3002 \u5982\u679c\u672a\u68c0\u6d4b\u5230 IPVS \u5185\u6838\u6a21\u5757\uff0c\u5219 kube-proxy \u5c06\u9000\u56de\u5230\u4ee5 iptables \u4ee3\u7406\u6a21\u5f0f\u8fd0\u884c\u3002\n<\/p><\/blockquote>\n<p>ipvs\u5728\u540c\u6b65\u89c4\u5219\u3001\u7f51\u7edc\u5e26\u5bbd\u3001cpu\/\u5185\u5b58\u6d88\u8017\u4e0a\u90fd\u660e\u663e\u4f18\u4e8eiptables\uff0c\u5173\u4e8e\u5177\u4f53\u7684\u6027\u80fd\u6570\u636e\u53ef\u4ee5\u770b\u8fd9\u7bc7\u6587\u7ae0: <a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/zhuanlan.zhihu.com\/p\/37230013\">\u534e\u4e3a\u4e91\u5728 K8S \u5927\u89c4\u6a21\u573a\u666f\u4e0b\u7684 Service \u6027\u80fd\u4f18\u5316\u5b9e\u8df5<\/a>\u3002ipvs\u7684\u8be6\u7ec6\u4ecb\u7ecd\u53ef\u4ee5\u770b\u8fd9\u7bc7\u6587\u7ae0:<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/www.qikqiak.com\/post\/how-to-use-ipvs-in-kubernetes\/\">ipvs \u57fa\u672c\u4ecb\u7ecd<\/a>\u3002ipvs\u548ciptables\u7684\u5bf9\u6bd4:<a class=\"wp-editor-md-post-content-link\" href=\"https:\/\/blog.fleeto.us\/post\/iptables-or-ipvs\/\">kube-proxy \u6a21\u5f0f\u5bf9\u6bd4\uff1aiptables \u8fd8\u662f IPVS\uff1f<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7406\u89e3service\u7684\u89d2\u5ea6 \u8fd9\u7bc7\u6587\u7ae0\u4e0d\u662f\u5173\u4e8e\u5982\u4f55\u4f7f\u7528kubernetes\u4e2d\u7684service\uff0c\u800c\u662f\u5c1d\u8bd5\u6574\u7406\u6211\u81ea\u5df1\u5bf9 &hellip; <a href=\"https:\/\/www.myway5.com\/index.php\/2019\/10\/30\/kubernetes-service\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u7406\u89e3kubernetes service<\/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":[89],"tags":[],"class_list":["post-478","post","type-post","status-publish","format-standard","hentry","category-k8s"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u7406\u89e3kubernetes service - \u4e00\u53ea\u5b89\u9759\u7684\u732b<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.myway5.com\/index.php\/2019\/10\/30\/kubernetes-service\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7406\u89e3kubernetes service - \u4e00\u53ea\u5b89\u9759\u7684\u732b\" \/>\n<meta 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