Prometheus Adapter for Kubernetes Metrics APIs
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External
- https://github.com/DirectXMan12/k8s-prometheus-adapter
- https://github.com/prometheus-community/helm-charts/tree/main/charts/prometheus-adapter
Internal
Overview
The Prometheus adapter is a Kubernetes Aggregation Layer extension and operates as an extension API server. It knows how to communicate with both Kubernetes and Prometheus, acting as a translator between the two.
Helm Installation
The adapter will be installed in the same namespace as Prometheus.
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm search repo prometheus-community
helm install -n prom prometheus-adapter prometheus-community/prometheus-adapter -f ./prometheus-adapter-overlay.yaml
See Configuration below for prometheus-adapter-overlay.yaml.
Test installation:
kubectl get --raw /apis/custom.metrics.k8s.io/v1beta1 | jq
{
"kind": "APIResourceList",
"apiVersion": "v1",
"groupVersion": "custom.metrics.k8s.io/v1beta1",
"resources": [
{
"name": "jobs.batch/kubernetes_build_info",
"singularName": "",
"namespaced": true,
"kind": "MetricValueList",
"verbs": [
"get"
]
},
{
"name": "services/kube_deployment_spec_strategy_rollingupdate_max_surge",
"singularName": "",
"namespaced": true,
"kind": "MetricValueList",
"verbs": [
"get"
]
},
...
}
Configuration
Use the following prometheus-adapter-overlay.yaml:
helm show values prometheus-community/prometheus-adapter > ~/tmp/prometheus-adapter-overlay.yaml
Increase log level when installing the chart.
Troubleshooting
tail the logs, Prometheus connection refused is reported there.