kubernetes - 使用自定义指标设置 Kubernetes 自动缩放

Question

我正在尝试根据自定义指标在 Kubernetes 1.2.3 (beta) 集群上设置自动缩放。 (我已经在集群上尝试过基于 CPU 的自动缩放，而且效果很好。)

我试图关注他们的custom metrics proposal ，但我在创建必要的设置时遇到了问题。

这是我到目前为止所做的:

向正在部署的 pod 规范添加了自定义指标注释
(类似于他们提案中提供的配置):

apiVersion: v1
kind: ReplicationController
metadata:
  name: metrix
  namespace: "default"
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: metrix
      annotations:
        metrics.alpha.kubernetes.io/custom-endpoints: >
          [
            {
              "api": "prometheus",
              "path": "/status",
              "port": "9090",
              "names": ["test1"]
            },
            {
              "api": "prometheus",
              "path": "/metrics",
              "port": "9090"
              "names": ["test2"]
            }
          ]
    spec:
      containers:
      - name: metrix
        image: janaka/prometheus-ep:v1
        resources:
          requests:
            cpu: 400m

创建了一个标记为 janaka/prometheus-ep:v1 的 Docker 容器(本地)在端口 9090 上运行与 Prometheus 兼容的服务器，/status和 /metrics端点

通过附加 --enable-custom-metrics=true 在 kubelet 上启用自定义指标至KUBELET_OPTS在 /etc/default/kubelet (基于 the kubelet CLI reference )并重新启动 kubelet

所有 pod(在 default 和 kube-system 命名空间中)都在运行，并且 heapster pod 日志也不包含任何“异常”输出(除了启动时的小故障，由于 InfluxDB 暂时不可用):

$ kubesys logs -f heapster-daftr

I0427 05:07:45.807277       1 heapster.go:60] /heapster --source=kubernetes:https://kubernetes.default --sink=influxdb:http://monitoring-influxdb:8086
I0427 05:07:45.807359       1 heapster.go:61] Heapster version 1.1.0-beta1
I0427 05:07:45.807638       1 configs.go:60] Using Kubernetes client with master "https://kubernetes.default" and version "v1"
I0427 05:07:45.807661       1 configs.go:61] Using kubelet port 10255
E0427 05:08:15.847319       1 influxdb.go:185] issues while creating an InfluxDB sink: failed to ping InfluxDB server at "monitoring-influxdb:8086" - Get http://monitoring-influxdb:8086/ping: dial tcp xxx.xxx.xxx.xxx:8086: i/o timeout, will retry on use
I0427 05:08:15.847376       1 influxdb.go:199] created influxdb sink with options: host:monitoring-influxdb:8086 user:root db:k8s
I0427 05:08:15.847412       1 heapster.go:87] Starting with InfluxDB Sink
I0427 05:08:15.847427       1 heapster.go:87] Starting with Metric Sink
I0427 05:08:15.877349       1 heapster.go:166] Starting heapster on port 8082
I0427 05:08:35.000342       1 manager.go:79] Scraping metrics start: 2016-04-27 05:08:00 +0000 UTC, end: 2016-04-27 05:08:30 +0000 UTC
I0427 05:08:35.035800       1 manager.go:152] ScrapeMetrics: time: 35.209696ms size: 24
I0427 05:08:35.044674       1 influxdb.go:177] Created database "k8s" on influxDB server at "monitoring-influxdb:8086"
I0427 05:09:05.000441       1 manager.go:79] Scraping metrics start: 2016-04-27 05:08:30 +0000 UTC, end: 2016-04-27 05:09:00 +0000 UTC
I0427 05:09:06.682941       1 manager.go:152] ScrapeMetrics: time: 1.682157776s size: 24
I0427 06:43:38.767146       1 manager.go:79] Scraping metrics start: 2016-04-27 05:09:00 +0000 UTC, end: 2016-04-27 05:09:30 +0000 UTC
I0427 06:43:38.810243       1 manager.go:152] ScrapeMetrics: time: 42.940682ms size: 1
I0427 06:44:05.012989       1 manager.go:79] Scraping metrics start: 2016-04-27 06:43:30 +0000 UTC, end: 2016-04-27 06:44:00 +0000 UTC
I0427 06:44:05.063583       1 manager.go:152] ScrapeMetrics: time: 50.368106ms size: 24
I0427 06:44:35.002038       1 manager.go:79] Scraping metrics start: 2016-04-27 06:44:00 +0000 UTC, end: 2016-04-27 06:44:30 +0000 UTC

但是，自定义端点没有被抓取。 (我通过为我的服务器的启动和端点处理程序添加标准错误日志来验证它；只有服务器初始化日志显示在 pod 的 kubectl 日志中。)

由于我是 Kubernetes 的新手，因此非常感谢任何帮助。

(根据我对提案和 this issue 的理解，我们不必在集群中运行单独的 Prometheus 收集器，因为 cAdvisor 应该已经从 pod 规范中定义的端点提取数据。这是真的，还是我也需要一个单独的 Prometheus 收集器？)

Answer 1

custom metrics proposal已过期。

请引用user guide ，目前正在审查中。