{"id":944,"date":"2022-06-13T11:22:06","date_gmt":"2022-06-13T03:22:06","guid":{"rendered":"https:\/\/blog.frost-s.com\/?p=944"},"modified":"2022-06-13T14:42:40","modified_gmt":"2022-06-13T06:42:40","slug":"k8s-%e7%bd%91%e7%bb%9c%e8%bd%ac%e5%8f%91%e9%97%ae%e9%a2%98%e8%ae%b0%e5%bd%95","status":"publish","type":"post","link":"https:\/\/blog.frost-s.com\/index.php\/2022\/06\/13\/k8s-%e7%bd%91%e7%bb%9c%e8%bd%ac%e5%8f%91%e9%97%ae%e9%a2%98%e8%ae%b0%e5%bd%95\/","title":{"rendered":"k8s \u7f51\u7edc\u8f6c\u53d1\u95ee\u9898\u8bb0\u5f55"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u95ee\u9898\u6982\u8ff0<\/h2>\n\n\n\n<p>\u73af\u5883\uff1a\u5185\u7f51\u670d\u52a1\u5668k8s\u4e0a\u90e8\u7f72\u4e86\u670d\u52a1\u7aef\u3001openresty\u524d\u7aef\uff0c\u901a\u8fc7\u516c\u7f51\u670d\u52a1\u5668\u8f6c\u53d1\u5230\u5185\u7f51\u7684nginx\u5bf9\u5e94\u7aef\u53e3\u3002<\/p>\n\n\n\n<p>\u95ee\u9898\uff1a\u516c\u7f51ip\u8fdb\u884c\u53d1\u9001\u8bf7\u6c42\uff0c\u540e\u7aef\u62ff\u53d6\u8bf7\u6c42\u5934\u6e90IP\u5730\u5740\u4e22\u5931\u3002<\/p>\n\n\n\n<p>\u601d\u8003\uff1a\u8003\u8651\u662fk8s \u81ea\u5e26\u8d1f\u8f7d\u5747\u8861\u8fdb\u884c\u4e86\u8f6c\u53d1\u5230\u4e0d\u540c\u7684Node\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u5bf9\u4e8e<code>NodePort<\/code> \u7c7b\u578b\u7684 <code>service<\/code> \u800c\u8a00\uff0c\u6709\u4e00\u4e2a\u53c2\u6570\u662f <code>externalTrafficPolicy=Local<\/code><\/p>\n\n\n\n<p><a href=\"https:\/\/kubernetes.io\/zh-cn\/docs\/tutorials\/services\/source-ip\/\">\u9644\uff1a \u5b98\u65b9\u6587\u6863<\/a><\/p>\n\n\n\n<p>\u5373 <code>service.spec.externalTrafficPolicy=Local<\/code><\/p>\n\n\n\n<p>\u521a\u597d\u6700\u8fd1\u673a\u7f18\u5de7\u5408\u4e4b\u4e0b\u5bf9\u8fd9\u4e2a\u53c2\u6570\u4e86\u89e3\u4e86\u4e00\u4e0b\uff0c\u4e8e\u662f\u628a\u6211\u7684\u4e2a\u4eba\u7406\u89e3\u5199\u5728\u8fd9\u91cc\uff0c\u5206\u4eab\u7ed9\u5927\u5bb6<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u524d\u8a00<\/h2>\n\n\n\n<p>\u5bf9\u4e8e<code>Service<\/code>, \u5982\u679c\u6307\u5b9a\u7c7b\u578b\u4e3a <code>NodePort<\/code>, \u90a3\u4e48\u8fd9\u4e2a\u7aef\u53e3\u4f1a\u5728\u96c6\u7fa4\u7684\u6240\u6709 <code>Node<\/code> \u4e0a\u6253\u5f00\uff0c\u5373\u4f7f\u8fd9\u4e2a<code>Node<\/code> \u4e0a\u9762\u6ca1\u6709\u8fd9\u4e2apod<br>(\u5f88\u597d\u7406\u89e3\uff0c\u548c\u5b88\u62a4\u8fdb\u7a0b\u96c6\u4e0d\u4e00\u6837\uff0c\u5bf9\u4e8e<code>Deployment<\/code> \u6765\u8bf4\uff0c\u5f88\u5c11\u4f1a\u5728\u6bcf\u4e2a\u8282\u70b9\u4e0a\u90fd\u542f\u52a8pod\uff0c\u6240\u4ee5\u5fc5\u5b9a\u6709\u4e00\u4e9b\u8282\u70b9\u4e0a\u6ca1\u6709\u8fd9\u4e2apod)<\/p>\n\n\n\n<p>\u5f15\u51fa\u4e00\u4e2a\u95ee\u9898\uff0c\u5f53\u67d0\u4e2a\u8282\u70b9\u4e0a\u6ca1\u6709<code>pod<\/code>\u7684\u65f6\u5019\uff0c\u53c8\u53bb\u8bbf\u95eeta\u7684\u8fd9\u4e2a<code>NodePort<\/code>,\u80fd\u8bbf\u95ee\u5230\u5417\uff1f<\/p>\n\n\n\n<p>\u7b54\u6848\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6d41\u7a0b1\uff1a\uff08\u4f7f\u7528cluster\uff09<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>          client\n              \\ ^\n               \\ \\\n                v \\\n   node 1 &lt;--- node 2\n    | ^   SNAT\n    | |   --->\n    v |\n endpoint\n<\/code><\/pre>\n\n\n\n<p><code>externalTrafficPolicy<\/code>\u4f7f\u7528Cluster \u7f51\u7edc\u6d41\u7a0b\uff1a<\/p>\n\n\n\n<p>Client \u53d1\u9001TCP \u5305\u5230node2\uff1anodeport<\/p>\n\n\n\n<p>node2 \u5c06Client \u6e90IP \u5730\u5740\u8fdb\u884c\u66ff\u6362\u4e3anode2 \u7684IP \u5730\u5740<\/p>\n\n\n\n<p>node2 \u5c06\u8bf7\u6c42\u76ee\u7684\u5730ip\u66ff\u6362\u4e3apodIP<\/p>\n\n\n\n<p>tcp\u5305\u88ab\u8def\u7531\u5230node1\uff0c\u7136\u540e\u5230\u8fbeendpoint<\/p>\n\n\n\n<p>pod\u5b9e\u9645\u54cd\u5e94\u88ab\u8def\u7531\u5230node2<\/p>\n\n\n\n<p>node2\u628apod\u7684\u54cd\u5e94\u5728\u8f6c\u53d1\u7ed9\u5ba2\u6237\u7aef<\/p>\n\n\n\n<p>\u5728\u4e2d\u95f4\u76f8\u5f53\u4e8e\u5728node2\u4e2d\u8fdb\u884c\u4e86\u7f51\u7edc\u8f6c\u6362\uff0c\u6e90ip\u4fe1\u606f\u88ab\u9057\u5931\u6389\u4e86\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6d41\u7a0b2\uff1a\uff08\u4f7f\u7528Local\uff09<\/h3>\n\n\n\n<p>\u5728k8s \u4e2d\uff0c\u63d0\u4f9b\u4e86\u4fdd\u7559\u6e90IP \u4fe1\u606f\u7684\u529f\u80fd\uff0c\u5373\u8bbe\u7f6e<code>externalTrafficPolicy<\/code>=Local<\/p>\n\n\n\n<p>\u4e3aLocal\u65f6\u7684\u7f51\u7edc\u6d41\u7a0b<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>        client\n        ^ \/   \\\n       \/ \/     \\\n      \/ v       X\n   node 1     node 2\n    ^ |\n    | |\n    | v\n endpoint<\/code><\/pre>\n\n\n\n<p>client sends packet to node2:nodePort, which doesn\u2019t have any endpoints<br>\u5ba2\u6237\u7aef\u53d1\u9001tcp\u5305\u5230 node2:nodePort, \u4f46\u662f node2 \u5e76\u6ca1\u6709 \u8fd9\u4e2apod<\/p>\n\n\n\n<p>packet is dropped<br>tcp\u5305\u88ab\u4e22\u5f03client sends packet to node1:nodePort, which does have endpoints<br>\u5ba2\u6237\u7aef\u53d1\u9001\u6570\u636e\u5305\u5230 node1:nodePort, node1\u6709pod<\/p>\n\n\n\n<p>node1 routes packet to endpoint with the correct source IP<br>node1 \u628a\u5305\u8def\u7531\u5230\u5bf9\u5e94\u7684pod\uff0c\u90a3\u4e48pod \u5c31\u53ef\u4ee5\u62ff\u5230\u6b63\u786e\u7684\u5ba2\u6237\u7aef\u6e90IP\u5730\u5740<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u7ed3<\/h3>\n\n\n\n<p>\u5373\u4f7f\u7528Local\u6a21\u5f0f\uff0c\u5728\u8bf7\u6c42\u8fc7\u6765\u7684\u65f6\u5019\uff0c\u5982\u679cnode\u6ca1\u6709\u5bf9\u5e94pod\uff0c\u5219\u4f1a\u5c06tcp\u7684\u5305\u4e22\u5f03\u6389\u3002<\/p>\n\n\n\n<p>\u800cCluster\u6a21\u5f0f\u5219\u4f1a\u8fdb\u884c\u5185\u90e8\u8def\u7531\uff0c\u5185\u90e8\u8f6c\u53d1\u8bf7\u6c42\u5230\u5bf9\u5e94node \u7684pod \u4e0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u95ee\u9898\u6982\u8ff0 \u73af\u5883\uff1a\u5185\u7f51\u670d\u52a1\u5668k8s\u4e0a\u90e8\u7f72\u4e86\u670d\u52a1\u7aef\u3001openresty\u524d\u7aef\uff0c\u901a\u8fc7\u516c\u7f51\u670d\u52a1\u5668\u8f6c\u53d1\u5230\u5185\u7f51\u7684nginx\u5bf9 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":935,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,8,6],"tags":[27],"_links":{"self":[{"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/posts\/944"}],"collection":[{"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/comments?post=944"}],"version-history":[{"count":1,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/posts\/944\/revisions"}],"predecessor-version":[{"id":945,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/posts\/944\/revisions\/945"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/media\/935"}],"wp:attachment":[{"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/media?parent=944"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/categories?post=944"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.frost-s.com\/index.php\/wp-json\/wp\/v2\/tags?post=944"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}