难以使用外部指标配置 Horizontal Pod Autoscaler [英] Difficulty configuring Horizontal Pod Autoscaler with external metric
问题描述
我正在尝试配置 Horizontal Pod Autoscaler 以根据连接的 GPU 的占空比扩展部署.
I'm attempting to configure a Horizontal Pod Autoscaler to scale a deployment based on the duty cycle of attached GPUs.
我使用的是 GKE,我的 Kubernetes 主版本是 1.10.7-gke.6 .
I'm using GKE, and my Kubernetes master version is 1.10.7-gke.6 .
我正在https://cloud.google.com/kubernetes-engine/docs/tutorials/external-metrics-autoscaling.特别是,我运行了以下命令来设置自定义指标:
I'm working off the tutorial at https://cloud.google.com/kubernetes-engine/docs/tutorials/external-metrics-autoscaling . In particular, I ran the following command to set up custom metrics:
kubectl create -f https://raw.githubusercontent.com/GoogleCloudPlatform/k8s-stackdriver/master/custom-metrics-stackdriver-adapter/deploy/production/adapter.yaml
这似乎奏效了,或者至少我可以在/apis/custom.metrics.k8s.io/v1beta1 访问指标列表.
This appears to have worked, or at least I can access a list of metrics at /apis/custom.metrics.k8s.io/v1beta1 .
这是我的 YAML:
apiVersion: autoscaling/v2beta1
kind: HorizontalPodAutoscaler
metadata:
name: images-srv-hpa
spec:
minReplicas: 1
maxReplicas: 10
metrics:
- type: External
external:
metricName: container.googleapis.com|container|accelerator|duty_cycle
targetAverageValue: 50
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: images-srv-deployment
我相信 metricName 存在是因为它在/apis/custom.metrics.k8s.io/v1beta1 中列出,并且因为它在 https://cloud.google.com/monitoring/api/metrics_gcp .
I believe that the metricName exists because it's listed in /apis/custom.metrics.k8s.io/v1beta1 , and because it's described on https://cloud.google.com/monitoring/api/metrics_gcp .
这是我在描述 HPA 时遇到的错误:
This is the error I get when describing the HPA:
Type Reason Age From Message
---- ------ ---- ---- -------
Warning FailedGetExternalMetric 18s (x3 over 1m) horizontal-pod-autoscaler unable to get external metric prod/container.googleapis.com|container|accelerator|duty_cycle/nil: no metrics returned from external metrics API
Warning FailedComputeMetricsReplicas 18s (x3 over 1m) horizontal-pod-autoscaler failed to get container.googleapis.com|container|accelerator|duty_cycle external metric: unable to get external metric prod/container.googleapis.com|container|accelerator|duty_cycle/nil: no metrics returned from external metrics API
我真的不知道如何调试这个.有谁知道可能出了什么问题,或者我接下来可以做什么?
I don't really know how to go about debugging this. Does anyone know what might be wrong, or what I could do next?
推荐答案
一旦我将系统置于负载之下,这个问题就会自行消失.现在使用相同的配置可以正常工作.
This problem went away on its own once I placed the system under load. It's working fine now with the same configuration.
我不知道为什么.我最好的猜测是 StackMetrics 直到它超过 1% 才报告占空比值.
I'm not sure why. My best guess is that StackMetrics wasn't reporting a duty cycle value until it went above 1%.
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