{"id":43542,"date":"2023-11-02T18:04:19","date_gmt":"2023-12-26T05:34:05","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e6%83%b3%e5%9c%a8%e8%87%aa%e5%b7%b1%e7%9a%84%e6%8c%87%e6%a0%87%e6%9c%8d%e5%8a%a1%e5%99%a8%e4%b8%8a%e4%bd%bf%e7%94%a8-horizontalpodautoscaler%ef%bc%81\/"},"modified":"2024-05-04T07:11:06","modified_gmt":"2024-05-03T23:11:06","slug":"%e6%88%91%e6%83%b3%e5%9c%a8%e8%87%aa%e5%b7%b1%e7%9a%84%e6%8c%87%e6%a0%87%e6%9c%8d%e5%8a%a1%e5%99%a8%e4%b8%8a%e4%bd%bf%e7%94%a8-horizontalpodautoscaler%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e6%83%b3%e5%9c%a8%e8%87%aa%e5%b7%b1%e7%9a%84%e6%8c%87%e6%a0%87%e6%9c%8d%e5%8a%a1%e5%99%a8%e4%b8%8a%e4%bd%bf%e7%94%a8-horizontalpodautoscaler%ef%bc%81\/","title":{"rendered":"\u6211\u60f3\u5728\u81ea\u5df1\u7684\u6307\u6807\u670d\u52a1\u5668\u4e0a\u4f7f\u7528 HorizontalPodAutoscaler\uff01"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u5f53\u4f60\u60f3\u5728\u9664\u4e86\u8d44\u6e90\u6307\u6807API\u4ee5\u5916\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u6c34\u5e73Pod\u81ea\u52a8\u7f29\u653e\u5668\uff08HPA\uff09\uff0c\u4f8b\u5982\u5f53\u4f60\u60f3\u4f7f\u7528Prometheus\u7684\u6307\u6807\u65f6\uff0c\u4f60\u53ef\u80fd\u4f1a\u8003\u8651\u4f7f\u7528Prometheus\u9002\u914d\u5668\u6216Kube Metrics\u9002\u914d\u5668\u3002<\/p>\n<p>\u5982\u679c\u6ca1\u6709\u9488\u5bf9\u8981\u4f7f\u7528\u7684\u6570\u636e\u6e90\u7684\u81ea\u5b9a\u4e49\/\u5916\u90e8\u5ea6\u91cf\u670d\u52a1\u5668\uff0c\u4f8b\u5982\u5f53\u4f60\u60f3\u8981\u4f7f\u7528\u5185\u90e8\u81ea\u6709\u76d1\u63a7\u57fa\u7840\u8bbe\u65bd\u7684\u5ea6\u91cf\u8fdb\u884cHPA\u65f6\uff0c\u4f60\u5e94\u8be5\u600e\u4e48\u505a\u5462\uff1f<br \/>\n\u4e3a\u4e86\u80fd\u591f\u5728\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\u65f6\u8bf4\u51fa\u201c\u6ca1\u95ee\u9898\uff0c\u6211\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u201d\uff0c\u6211\u521b\u5efa\u4e86\u4e00\u4e2a\u5ea6\u91cf\u670d\u52a1\u5668\u3002<\/p>\n<h1>\u201c\u4e2a\u6027\u5316\/\u5916\u90e8\u5ea6\u91cf\u670d\u52a1\u5668\u662f\u4ec0\u4e48\uff1f\u201d<\/h1>\n<p>\u6211\u5efa\u8bae\u60a8\u53c2\u8003Ladicle\u3055\u3093\u7684\u300a\u5229\u7528\u81ea\u6709\u5ea6\u91cf\u6307\u6807\u8fdb\u884cPod\u7684\u6c34\u5e73\u6269\u5c55\u300b\u4e00\u6587\uff0c\u5176\u4e2d\u8be6\u7ec6\u89e3\u91ca\u4e86\u8fd9\u4e00\u70b9\u3002\u6211\u5728\u8fd9\u91cc\u7b80\u8981\u8bf4\u660e\u4e00\u4e0b\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ab\u30b9\u30bf\u30e0\u30e1\u30c8\u30ea\u30af\u30b9\u30b5\u30fc\u30d0: Kubernetes API\u30ea\u30bd\u30fc\u30b9\u306b\u7d10\u3065\u304f\u30ea\u30bd\u30fc\u30b9\u306e\u30e1\u30c8\u30ea\u30af\u30b9\u3092\u63d0\u4f9b\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5916\u90e8\u30e1\u30c8\u30ea\u30af\u30b9\u30b5\u30fc\u30d0: Kubernetes API\u30ea\u30bd\u30fc\u30b9\u306b\u7d10\u3065\u304b\u306a\u3044\u30e1\u30c8\u30ea\u30af\u30b9\u3092\u63d0\u4f9b\u3059\u308b<\/ul>\n<p>\u6709\u4e9b\u5b9e\u73b0\u4e86\u8fd9\u4e24\u4e2a\u9009\u9879\uff0c\u6709\u4e9b\u53ea\u5b9e\u73b0\u4e86\u5176\u4e2d\u4e00\u4e2a\u3002<br \/>\n\u56e0\u4e3a\u81ea\u5b9a\u4e49\u5ea6\u91cf\u670d\u52a1\u5668\u548cKubernetes\u5bf9\u8c61\u7684\u5173\u8054\u6709\u70b9\u590d\u6742\uff0c\u6240\u4ee5\u8fd9\u6b21\u6211\u4eec\u5b9e\u73b0\u4e86\u5916\u90e8\u7684\u5ea6\u91cf\u670d\u52a1\u5668\u6765\u66ff\u4ee3\u3002<\/p>\n<h1>\u5173\u4e8e\u5df2\u5b9e\u65bd\u7684\u5916\u90e8\u5ea6\u91cf\u670d\u52a1\u5668<\/h1>\n<p>\u8fd9\u4e2a\u6210\u679c\u7269\u5728\u8fd9\u4e2a\u5b58\u50a8\u5e93\u91cc\u3002<br \/>\n\u8fd9\u6b21\u6211\u4eec\u5236\u4f5c\u4e86\u4e00\u4e9b\u7c7b\u4f3c Prometheus Adapter \u6216 Kube Metrics Adapter \u7684\u4e1c\u897f\u3002\u5f53\u7b80\u5355\u914d\u7f6e\u7684\u5916\u90e8\u5ea6\u91cf\u88ab\u4ece Kubernetes \u8c03\u7528\u65f6\uff0c\u5b83\u662f\u4e00\u4e2a\u5916\u90e8\u5ea6\u91cf\u670d\u52a1\u5668\uff0c\u4f1a\u8fd4\u56de\u4e0e\u5176\u76f8\u5173\u7684 PromQL \u7ed3\u679c\u3002\u6211\u4eec\u53ea\u662f\u8bd5\u7740\u5236\u4f5c\u4e86\u4e00\u4e0b\uff0c\u6240\u4ee5\u5b83\u505a\u5f97\u76f8\u5f53\u7c97\u7cd9\uff0c\u4f46\u603b\u4f53\u4e0a\u662f\u53ef\u8fd0\u884c\u7684\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d533937434c4406ccf01b\/9-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2020-12-22 9.44.51.png\" \/><\/div>\n<p>\u5c06\u4ee5\u4e0b\u7684\u914d\u7f6e\u7528\u4f5c\u914d\u7f6e\u6587\u4ef6\u6765\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\"># Prometheus\u306eURL<\/span>\r\n<span class=\"na\">url<\/span><span class=\"pi\">:<\/span> <span class=\"s\">http:\/\/prometheus.kube-system:9090<\/span>\r\n<span class=\"na\">queries<\/span><span class=\"pi\">:<\/span> \r\n  <span class=\"c1\"># External Metrics\u540d: PromQL<\/span>\r\n  <span class=\"na\">prom_up<\/span><span class=\"pi\">:<\/span> <span class=\"s\">up{component=\"prometheus\"}<\/span>\r\n  <span class=\"na\">http_requests_total<\/span><span class=\"pi\">:<\/span> <span class=\"s\">http_requests_total<\/span>\r\n  <span class=\"na\">go_gc_duration_seconds_count<\/span><span class=\"pi\">:<\/span> <span class=\"s\">go_gc_duration_seconds_count<\/span>\r\n<\/code><\/pre>\n<p>\u5df2\u5c06Prometheus\u7684\u67e5\u8be2\u7ed3\u679c\u4e2d\u5305\u542b\u7684\u6807\u7b7e\u4f5c\u4e3a\u5916\u90e8\u6307\u6807\u7684\u6807\u7b7e\u6765\u4f7f\u7528\u3002\u56e0\u6b64\uff0c\u5728PromQL\u9636\u6bb5\u53ef\u4ee5\u4f7f\u7528\u6807\u7b7e\u8fdb\u884c\u7b5b\u9009\uff0c\u540c\u65f6\u4e5f\u53ef\u4ee5\u5728HPA\u7684\u9009\u62e9\u5668\u4e2d\u8fdb\u884c\u7b5b\u9009\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"na\">apiVersion<\/span><span class=\"pi\">:<\/span> <span class=\"s\">autoscaling\/v2beta2<\/span>\r\n<span class=\"na\">kind<\/span><span class=\"pi\">:<\/span> <span class=\"s\">HorizontalPodAutoscaler<\/span>\r\n<span class=\"nn\">...<\/span>\r\n<span class=\"na\">spec<\/span><span class=\"pi\">:<\/span>\r\n  <span class=\"na\">metrics<\/span><span class=\"pi\">:<\/span>\r\n  <span class=\"pi\">-<\/span> <span class=\"na\">type<\/span><span class=\"pi\">:<\/span> <span class=\"s\">External<\/span>\r\n    <span class=\"na\">external<\/span><span class=\"pi\">:<\/span>\r\n      <span class=\"na\">metric<\/span><span class=\"pi\">:<\/span>\r\n        <span class=\"na\">name<\/span><span class=\"pi\">:<\/span> <span class=\"s\">http_requests_total<\/span>\r\n        <span class=\"c1\"># Prometheus\u306e\u30e1\u30c8\u30ea\u30af\u30b9\u306b\u542b\u307e\u308c\u308b\u30e9\u30d9\u30eb\u3067\u7d5e\u308a\u8fbc\u307f\u53ef\u80fd<\/span>\r\n        <span class=\"na\">selector<\/span><span class=\"pi\">:<\/span>\r\n          <span class=\"na\">matchLabels<\/span><span class=\"pi\">:<\/span>\r\n            <span class=\"na\">component<\/span><span class=\"pi\">:<\/span> <span class=\"s\">web-app<\/span>\r\n      <span class=\"na\">target<\/span><span class=\"pi\">:<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"pi\">:<\/span> <span class=\"s\">AverageValue<\/span>\r\n        <span class=\"na\">averageValue<\/span><span class=\"pi\">:<\/span> <span class=\"m\">30<\/span>\r\n<\/code><\/pre>\n<h1>\u5b9e\u65bd<\/h1>\n<p>\u5728Custom Metrics Server\u4e2d\uff0c\u5b98\u65b9\u5df2\u7ecf\u63d0\u4f9b\u4e86\u4e00\u4e2aBoilerplate\uff0c\u5982\u679c\u4f7f\u7528\u5b83\uff0c\u53ef\u4ee5\u76f8\u5bf9\u5bb9\u6613\u5730\u521b\u5efa\u4e00\u4e2a\u3002\u4f60\u53ea\u9700\u8981\u5b9e\u73b0\u4e00\u4e2a\u63a5\u53e3\u5373\u53ef\u3002\u8be5\u5b58\u50a8\u5e93\u8fd8\u5305\u542b\u4e86\u5728\u521b\u5efa\u5ea6\u91cf\u670d\u52a1\u5668\u65f6\u6709\u7528\u7684\u8f85\u52a9\u51fd\u6570\u3002<br \/>\n\u6837\u672c\u5b9e\u73b0\u5728\u6b64\u5904\u53ef\u89c1\uff0c\u5e76\u4e14\u6709\u5173\u521b\u5efa\u81ea\u5b9a\u4e49\u5ea6\u91cf\u670d\u52a1\u5668\u7684\u6587\u6863\u4e5f\u5df2\u7ecf\u51c6\u5907\u597d\u4e86\u3002<\/p>\n<p>\u5982\u679c\u8981\u5b9e\u73b0Custom Metrics Server\uff0c\u5219\u9700\u5728pkg\/provider\u4e2d\u5b9e\u73b0CustomMetricsProvider\u63a5\u53e3\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">CustomMetricsProvider<\/span> <span class=\"k\">interface<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c\">\/\/ \u6761\u4ef6\u306b\u30de\u30c3\u30c1\u3059\u308b\u30ab\u30b9\u30bf\u30e0\u30e1\u30c8\u30ea\u30af\u30b9\u306e\u30ea\u30b9\u30c8\u3092\u8fd4\u3059<\/span>\r\n    <span class=\"n\">GetMetricByName<\/span><span class=\"p\">(<\/span><span class=\"n\">name<\/span> <span class=\"n\">types<\/span><span class=\"o\">.<\/span><span class=\"n\">NamespacedName<\/span><span class=\"p\">,<\/span> <span class=\"n\">info<\/span> <span class=\"n\">CustomMetricInfo<\/span><span class=\"p\">,<\/span> <span class=\"n\">metricSelector<\/span> <span class=\"n\">labels<\/span><span class=\"o\">.<\/span><span class=\"n\">Selector<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">custom_metrics<\/span><span class=\"o\">.<\/span><span class=\"n\">MetricValue<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">GetMetricBySelector<\/span><span class=\"p\">(<\/span><span class=\"n\">namespace<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">selector<\/span> <span class=\"n\">labels<\/span><span class=\"o\">.<\/span><span class=\"n\">Selector<\/span><span class=\"p\">,<\/span> <span class=\"n\">info<\/span> <span class=\"n\">CustomMetricInfo<\/span><span class=\"p\">,<\/span> <span class=\"n\">metricSelector<\/span> <span class=\"n\">labels<\/span><span class=\"o\">.<\/span><span class=\"n\">Selector<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">custom_metrics<\/span><span class=\"o\">.<\/span><span class=\"n\">MetricValueList<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span>\r\n\r\n    <span class=\"c\">\/\/ \u305d\u306e\u6642\u70b9\u306b\u304a\u3051\u308b\u30e1\u30c8\u30ea\u30af\u30b9\u30b5\u30fc\u30d0\u3067\u5229\u7528\u53ef\u80fd\u306a\u30e1\u30c8\u30ea\u30af\u30b9\u60c5\u5831\u306e\u30ea\u30b9\u30c8\u3092\u8fd4\u3059<\/span>\r\n    <span class=\"n\">ListAllMetrics<\/span><span class=\"p\">()<\/span> <span class=\"p\">[]<\/span><span class=\"n\">CustomMetricInfo<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u8981\u5b9e\u73b0External Metrics Server\uff0c\u9700\u8981\u5b9e\u73b0ExternalMetricsProvider\u3002\u7531\u4e8e\u8fd9\u6b21\u662f\u5916\u90e8\u5ea6\u91cf\u670d\u52a1\u5668\uff0c\u56e0\u6b64\u6211\u4eec\u8fdb\u884c\u4e86\u6b64\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">ExternalMetricsProvider<\/span> <span class=\"k\">interface<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c\">\/\/ \u6761\u4ef6\u306b\u30de\u30c3\u30c1\u3059\u308b\u5916\u90e8\u30e1\u30c8\u30ea\u30af\u30b9\u306e\u30ea\u30b9\u30c8\u3092\u8fd4\u3059<\/span>\r\n    <span class=\"n\">GetExternalMetric<\/span><span class=\"p\">(<\/span><span class=\"n\">namespace<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">metricSelector<\/span> <span class=\"n\">labels<\/span><span class=\"o\">.<\/span><span class=\"n\">Selector<\/span><span class=\"p\">,<\/span> <span class=\"n\">info<\/span> <span class=\"n\">ExternalMetricInfo<\/span><span class=\"p\">)<\/span> <span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">external_metrics<\/span><span class=\"o\">.<\/span><span class=\"n\">ExternalMetricValueList<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"c\">\/\/ \u305d\u306e\u6642\u70b9\u306b\u304a\u3051\u308b\u30e1\u30c8\u30ea\u30af\u30b9\u30b5\u30fc\u30d0\u3067\u5229\u7528\u53ef\u80fd\u306a\u30e1\u30c8\u30ea\u30af\u30b9\u60c5\u5831\u306e\u30ea\u30b9\u30c8\u3092\u8fd4\u3059<\/span>\r\n    <span class=\"n\">ListAllExternalMetrics<\/span><span class=\"p\">()<\/span> <span class=\"p\">[]<\/span><span class=\"n\">ExternalMetricInfo<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u83b7\u53d6\u5916\u90e8\u5ea6\u91cf\u503c<\/h2>\n<p>\u5f53\u8c03\u7528GetExternalMetric\u51fd\u6570\u65f6\uff0c\u5c06\u4f20\u9012\u547d\u540d\u7a7a\u95f4\uff08\u5b57\u7b26\u4e32\uff09\u3001labels.Selector\u548cExternalMetricInfo\u4f5c\u4e3a\u53c2\u6570\u3002<br \/>\n\u7b2c\u4e00\u4e2a\u53c2\u6570\u547d\u540d\u7a7a\u95f4\u5c06\u88ab\u4f20\u9012\u4e3aHPA\u7684\u547d\u540d\u7a7a\u95f4\uff0c\u53ef\u4ee5\u7528\u4e8e\u8bbf\u95ee\u63a7\u5236\u548c\u6307\u6807\u6807\u8bc6\uff0c\u4f46\u4e5f\u53ef\u4ee5\u9009\u62e9\u4e0d\u4f7f\u7528\u3002<br \/>\n\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5c06\u4f5c\u4e3alabels.Selector\u4f20\u9012\u7ed9HPA\u7684spec.metrics.external.metric.selector\u3002\u4e3a\u4e86\u4f7f\u7528labels.Selector\uff0c\u6211\u4eec\u9700\u8981\u5c06\u6765\u81ea\u5916\u90e8(\u6bd4\u5982Prometheus)\u7684\u6307\u6807\u7684\u6807\u7b7e\u548c\u6807\u8bb0\u8f6c\u6362\u4e3aKubernetes\u7684labels.Set\uff0c\u4ee5\u4fbf\u80fd\u591f\u4f7f\u7528labels.Selector\uff0c\u6240\u4ee5\u6211\u4eec\u91c7\u7528\u4e86\u8fd9\u79cd\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">ls<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">labels<\/span><span class=\"o\">.<\/span><span class=\"n\">Set<\/span><span class=\"p\">{}<\/span>\r\n<span class=\"c\">\/\/ Prometheus\u306e\u30e9\u30d9\u30eb\u3092Kubernetes\u306e\u30e9\u30d9\u30eb\u3078\u5909\u63db<\/span>\r\n<span class=\"k\">for<\/span> <span class=\"n\">k<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">samples<\/span><span class=\"p\">[<\/span><span class=\"n\">i<\/span><span class=\"p\">]<\/span><span class=\"o\">.<\/span><span class=\"n\">Metric<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">ls<\/span><span class=\"p\">[<\/span><span class=\"kt\">string<\/span><span class=\"p\">(<\/span><span class=\"n\">k<\/span><span class=\"p\">)]<\/span> <span class=\"o\">=<\/span> <span class=\"kt\">string<\/span><span class=\"p\">(<\/span><span class=\"n\">v<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"c\">\/\/ labels.Selector\u3092\u6e80\u305f\u3059\u304b\u3069\u3046\u304b\u78ba\u8a8d<\/span>\r\n<span class=\"k\">if<\/span> <span class=\"o\">!<\/span><span class=\"n\">metricSelector<\/span><span class=\"o\">.<\/span><span class=\"n\">Matches<\/span><span class=\"p\">(<\/span><span class=\"n\">ls<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">continue<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8fd4\u56de\u503c\u5c06\u662fExternalMetricValueList\u5bf9\u8c61\u3002\u5b83\u662f\u4e00\u4e2a\u6307\u6807\u5217\u8868\u5bf9\u8c61\uff0c\u987e\u540d\u601d\u4e49\u3002\u6bcf\u4e2a\u6307\u6807\u90fd\u5305\u542b\u65f6\u95f4\u6233\u3001\u6307\u6807\u540d\u79f0\u3001\u6807\u7b7e\u548c\u6307\u6807\u503c\u7b49\u4fe1\u606f\u3002\u8fd9\u4e9b\u6307\u6807\u7684\u603b\u548c\u5c06\u88ab\u8ba1\u7b97\u4e3aHPA\u7684\u7ed3\u679c\u503c\uff0c\u4e0b\u9762\u662fKubernetes\u7aef\u7684\u76f8\u5173\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">\/\/ https:\/\/github.com\/kubernetes\/kubernetes\/blob\/v1.20.0\/pkg\/controller\/podautoscaler\/replica_calculator.go#L330-L337<\/span>\r\n<span class=\"c\">\/\/ or<\/span>\r\n<span class=\"c\">\/\/ https:\/\/github.com\/kubernetes\/kubernetes\/blob\/v1.20.0\/pkg\/controller\/podautoscaler\/replica_calculator.go#L352-L359<\/span>\r\n\r\n<span class=\"n\">metrics<\/span><span class=\"p\">,<\/span> <span class=\"n\">timestamp<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">metricsClient<\/span><span class=\"o\">.<\/span><span class=\"n\">GetExternalMetric<\/span><span class=\"p\">(<\/span><span class=\"n\">metricName<\/span><span class=\"p\">,<\/span> <span class=\"n\">namespace<\/span><span class=\"p\">,<\/span> <span class=\"n\">metricLabelSelector<\/span><span class=\"p\">)<\/span>\r\n<span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span> <span class=\"n\">time<\/span><span class=\"o\">.<\/span><span class=\"n\">Time<\/span><span class=\"p\">{},<\/span> <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Errorf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"unable to get external metric %s\/%s\/%+v: %s\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">namespace<\/span><span class=\"p\">,<\/span> <span class=\"n\">metricName<\/span><span class=\"p\">,<\/span> <span class=\"n\">metricSelector<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"n\">utilization<\/span> <span class=\"o\">=<\/span> <span class=\"m\">0<\/span>\r\n<span class=\"k\">for<\/span> <span class=\"n\">_<\/span><span class=\"p\">,<\/span> <span class=\"n\">val<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">metrics<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">utilization<\/span> <span class=\"o\">=<\/span> <span class=\"n\">utilization<\/span> <span class=\"o\">+<\/span> <span class=\"n\">val<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u7b2c\u4e09\u4e2a\u53c2\u6570\u7684ExternalMetricInfo\u4ec5\u5305\u542b\u6307\u6807\u540d\u79f0\u7684\u4fe1\u606f\u3002\u5728\u6211\u4eec\u521b\u5efa\u7684\u6307\u6807\u670d\u52a1\u5668\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u8fd9\u4e9b\u4fe1\u606f\u6765\u83b7\u53d6\u76f8\u5173\u7684PromQL\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">ExternalMetricInfo<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">Metric<\/span> <span class=\"kt\">string<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5217\u51fa\u6240\u6709\u5916\u90e8\u6307\u6807<\/h2>\n<p>ListAllExternalMetrics\u9700\u8981\u8fd4\u56de\u53ef\u7528\u4f5c\u5916\u90e8\u6307\u6807\u7684\u6307\u6807\u540d\u79f0\u5217\u8868\u3002\u5b9e\u73b0\u65b9\u6cd5\u662f\u5c06\u5728\u914d\u7f6e\u4e2d\u6307\u5b9a\u7684\u6307\u6807\u540d\u79f0\u7b80\u5355\u5730\u8fd4\u56de\u4e3aExternalMetricInfo\u7684\u5217\u8868\u3002<\/p>\n<h2>\u4f9b\u5e94\u5546\u7684\u6ce8\u518c<\/h2>\n<p>\u53ea\u9700\u8981\u5c06\u4e0a\u8ff0\u5b9e\u73b0\u7684Provider\u4f20\u9012\u7ed9AdapterBase\u51fd\u6570WithExternalMetrics\uff0c\u5e76\u8fd0\u884c\u5b83\uff0c\u5c31\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u4e2a\u5f88\u597d\u7684\u81ea\u5b9a\u4e49API\u670d\u52a1\u5668\u542f\u52a8\u5e76\u6ce8\u518c\u5230API Aggregation Layer\u7684APIService\u4e2d\u3002<br \/>\n\uff08\u6839\u636e\u540d\u4e3aAdapterBase\u7684\u547d\u540d\uff0c\u6211\u8ba4\u4e3a\u5b83\u662f\u4e3a\u4e86\u8fd9\u79cd\u5199\u6cd5\u800c\u8bbe\u8ba1\u7684\uff0c\u4f46\u4e3a\u4e86\u7b80\u5355\u8d77\u89c1\uff0c\u672c\u4f8b\u4e2d\u91c7\u7528\u4e86\u4ee5\u4e0b\u65b9\u6cd5\uff09<br \/>\n\u4e0b\u9762\u7684\u4ee3\u7801\u88ab\u7701\u7565\u4e86\u4e00\u4e9b\u89e3\u91ca\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">cmd<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">basecmd<\/span><span class=\"o\">.<\/span><span class=\"n\">AdapterBase<\/span><span class=\"p\">{}<\/span>\r\n\r\n        <span class=\"n\">provider<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">NewPrometheusProvider<\/span><span class=\"p\">(<\/span><span class=\"n\">config<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"n\">klog<\/span><span class=\"o\">.<\/span><span class=\"n\">Fatal<\/span><span class=\"p\">(<\/span><span class=\"n\">err<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"n\">cmd<\/span><span class=\"o\">.<\/span><span class=\"n\">WithExternalMetrics<\/span><span class=\"p\">(<\/span><span class=\"n\">provider<\/span><span class=\"p\">)<\/span>\r\n\r\n        <span class=\"n\">klog<\/span><span class=\"o\">.<\/span><span class=\"n\">Infof<\/span><span class=\"p\">(<\/span><span class=\"s\">\"starting sample metrics server\"<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">cmd<\/span><span class=\"o\">.<\/span><span class=\"n\">Run<\/span><span class=\"p\">(<\/span><span class=\"n\">wait<\/span><span class=\"o\">.<\/span><span class=\"n\">NeverStop<\/span><span class=\"p\">);<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n                <span class=\"n\">klog<\/span><span class=\"o\">.<\/span><span class=\"n\">Fatalf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"unable to run custom metrics adapter: %v\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\r\n        <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5e76\u4e14\u7ed9\u4e88\u9002\u5f53\u7684Role\/ClusterRole\u4ee5\u4f7f\u5176\u8fd0\u884c\uff0c\u5e76\u6ce8\u518c\u4e3aAPIService\uff0c\u5219\u5b83\u5c06\u6b63\u5e38\u5de5\u4f5c\u3002<br \/>\n\u7531\u4e8e\u6ca1\u6709\u4ed4\u7ec6\u7814\u7a76\u4f5c\u4e3a\u5ea6\u91cf\u670d\u52a1\u5668\u9700\u8981\u4ec0\u4e48\u6743\u9650\uff0c\u6240\u4ee5\u6211\u53ea\u662f\u5bf9\u793a\u4f8b\u5b9e\u73b0\u7a0d\u4f5c\u4fee\u6539\uff0c\u7528\u4e8e\u5916\u90e8\u5ea6\u91cf\u3002\u7136\u540e\u8fdb\u884c\u4e86\u90e8\u7f72\u3002<br \/>\n\u5982\u679c\u90e8\u7f72\u6210\u529f\u5e76\u4e14\u914d\u7f6e\u6b63\u786e\uff0c\u90a3\u4e48\u5b83\u5e94\u8be5\u53ef\u4ee5\u4f5c\u4e3a\u5e38\u89c4\u7684\u5916\u90e8\u5ea6\u91cf\u4f9bHPA\u4f7f\u7528\u3002<\/p>\n<h1>\u6700\u540e<\/h1>\n<p>\u6bd4\u6211\u60f3\u7684\u8981\u7b80\u5355\u5f97\u591a\uff0c\u6211\u6210\u529f\u5730\u81ea\u5df1\u5236\u4f5c\u4e86\u5ea6\u91cf\u670d\u52a1\u5668\u3002\u6839\u636e\u6587\u6863\u6765\u770b\uff0c\u81ea\u5b9a\u4e49\u5ea6\u91cf\u670d\u52a1\u5668\u4e0e\u6240\u9700\u7684Kubernetes API\u8d44\u6e90\u7684\u5173\u8054\u4e5f\u4e0d\u50cf\u6211\u60f3\u8c61\u7684\u90a3\u4e48\u9ebb\u70e6\uff0c\u6240\u4ee5\u4e5f\u8bb8\u53ef\u4ee5\u5728\u90a3\u91cc\u5b9e\u73b0\u5b83\u3002\u73b0\u5728\uff0c\u5373\u4f7f\u88ab\u544a\u77e5\u8981\u4e3a\u516c\u53f8\u5185\u90e8\u7684\u76d1\u63a7\u57fa\u7840\u8bbe\u65bd\u521b\u5efa\u5ea6\u91cf\u670d\u52a1\u5668\uff0c\u6211\u4e5f\u80fd\u591f\u81ea\u4fe1\u5730\u8bf4\uff1a\u201c\u6ca1\u95ee\u9898\uff0c\u6211\u80fd\u505a\u5230\u201d\u3002\u6211\u6253\u7b97\u5728\u5e74\u672b\u5e74\u59cb\u671f\u95f4\u4ee5\u6b64\u4e3a\u57fa\u7840\uff0c\u5728\u5bb6\u91cc\u5b89\u9759\u5730\u770b\u7535\u89c6\u5e76\u5b9e\u73b0\u6211\u7684\u4e2a\u4eba\u5ea6\u91cf\u670d\u52a1\u5668\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u5f53\u4f60\u60f3\u5728\u9664\u4e86\u8d44\u6e90\u6307\u6807API\u4ee5\u5916\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u6c34\u5e73Pod\u81ea\u52a8\u7f29\u653e\u5668\uff08HPA\uff09\uff0c\u4f8b\u5982\u5f53\u4f60\u60f3\u4f7f\u7528Promethe [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-43542","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u6211\u60f3\u5728\u81ea\u5df1\u7684\u6307\u6807\u670d\u52a1\u5668\u4e0a\u4f7f\u7528 HorizontalPodAutoscaler\uff01 - Blog - Silicon Cloud<\/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.silicloud.com\/zh\/blog\/\u6211\u60f3\u5728\u81ea\u5df1\u7684\u6307\u6807\u670d\u52a1\u5668\u4e0a\u4f7f\u7528-horizontalpodautoscaler\uff01\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6211\u60f3\u5728\u81ea\u5df1\u7684\u6307\u6807\u670d\u52a1\u5668\u4e0a\u4f7f\u7528 HorizontalPodAutoscaler\uff01\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u5f53\u4f60\u60f3\u5728\u9664\u4e86\u8d44\u6e90\u6307\u6807API\u4ee5\u5916\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u6c34\u5e73Pod\u81ea\u52a8\u7f29\u653e\u5668\uff08HPA\uff09\uff0c\u4f8b\u5982\u5f53\u4f60\u60f3\u4f7f\u7528Promethe [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u6211\u60f3\u5728\u81ea\u5df1\u7684\u6307\u6807\u670d\u52a1\u5668\u4e0a\u4f7f\u7528-horizontalpodautoscaler\uff01\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-12-26T05:34:05+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-03T23:11:06+00:00\" \/>\n<meta property=\"og:image\" 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