Metrics
https://medium.com/@cagri.ersen/kubernetes-metrics-server-installation-d93380de008
$ kubectl get apiservices |egrep metrics
v1beta1.metrics.k8s.io kube-system/metrics-server True 1h
$ kubectl get deploy,svc -n kube-system
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
deployment.extensions/coredns 2 2 2 2 79d
deployment.extensions/eks-autoscaler-aws-cluster-autoscaler 1 1 1 1 79d
deployment.extensions/metrics-server 1 1 1 1 117m
deployment.extensions/tiller-deploy 1 1 1 1 79d
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/eks-autoscaler-aws-cluster-autoscaler ClusterIP 172.20.2.211 <none> 8085/TCP 79d
service/kube-dns ClusterIP 172.20.0.10 <none> 53/UDP,53/TCP 79d
service/metrics-server ClusterIP 172.20.154.226 <none> 443/TCP 117m
service/tiller-deploy ClusterIP 172.20.52.34 <none> 44134/TCP 79d
$ kubectl top node
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
ip-10-158-53-105.us-west-2.compute.internal 145m 3% 3088Mi 19%
ip-10-158-53-22.us-west-2.compute.internal 129m 3% 3497Mi 22%
$ kubectl get --raw "/apis/metrics.k8s.io" | jq .
{
"kind": "APIGroup",
"apiVersion": "v1",
"name": "metrics.k8s.io",
"versions": [
{
"groupVersion": "metrics.k8s.io/v1beta1",
"version": "v1beta1"
}
],
"preferredVersion": {
"groupVersion": "metrics.k8s.io/v1beta1",
"version": "v1beta1"
}
}
$ kubectl get --raw "/apis/metrics.k8s.io/v1beta1" | jq .
{
"kind": "APIResourceList",
"apiVersion": "v1",
"groupVersion": "metrics.k8s.io/v1beta1",
"resources": [
{
"name": "nodes",
"singularName": "",
"namespaced": false,
"kind": "NodeMetrics",
"verbs": [
"get",
"list"
]
},
{
"name": "pods",
"singularName": "",
"namespaced": true,
"kind": "PodMetrics",
"verbs": [
"get",
"list"
]
}
]
}
$ kubectl get --raw "/apis/metrics.k8s.io/v1beta1/nodes" |jq .
{
"kind": "NodeMetricsList",
"apiVersion": "metrics.k8s.io/v1beta1",
"metadata": {
"selfLink": "/apis/metrics.k8s.io/v1beta1/nodes"
},
"items": [
{
"metadata": {
"name": "ip-10-158-53-22.us-west-2.compute.internal",
"selfLink": "/apis/metrics.k8s.io/v1beta1/nodes/ip-10-158-53-22.us-west-2.compute.internal",
"creationTimestamp": "2019-06-16T22:22:48Z"
},
"timestamp": "2019-06-16T22:22:09Z",
"window": "30s",
"usage": {
"cpu": "128506930n",
"memory": "3580948Ki"
}
},
{
"metadata": {
"name": "ip-10-158-53-105.us-west-2.compute.internal",
"selfLink": "/apis/metrics.k8s.io/v1beta1/nodes/ip-10-158-53-105.us-west-2.compute.internal",
"creationTimestamp": "2019-06-16T22:22:48Z"
},
"timestamp": "2019-06-16T22:22:07Z",
"window": "30s",
"usage": {
"cpu": "144727026n",
"memory": "3162612Ki"
}
}
]
}
$ kubectl get --raw "/apis/metrics.k8s.io/v1beta1/pods" | jq .
{
"kind": "PodMetricsList",
"apiVersion": "metrics.k8s.io/v1beta1",
"metadata": {
"selfLink": "/apis/metrics.k8s.io/v1beta1/pods"
},
"items": [
{
"metadata": {
"name": "rstudio-deployment-jeevandk-e414a8-5dcd8dd45b-vksml",
"namespace": "rstudio",
"selfLink": "/apis/metrics.k8s.io/v1beta1/namespaces/rstudio/pods/rstudio-deployment-jeevandk-e414a8-5dcd8dd45b-vksml",
"creationTimestamp": "2019-06-16T22:26:42Z"
},
"timestamp": "2019-06-16T22:26:08Z",
"window": "30s",
"containers": [
{
"name": "rstudio-jeevandk-e414a8",
"usage": {
"cpu": "735846n",
"memory": "92960Ki"
}
}
]
},
{
"metadata": {
"name": "prometheus-cluster-monitoring-0",
"namespace": "cattle-prometheus",
"selfLink": "/apis/metrics.k8s.io/v1beta1/namespaces/cattle-prometheus/pods/prometheus-cluster-monitoring-0",
"creationTimestamp": "2019-06-16T22:26:42Z"
},
"timestamp": "2019-06-16T22:25:56Z",
"window": "30s",
"containers": [
{
"name": "prometheus-agent",
"usage": {
"cpu": "579514n",
"memory": "14732Ki"
}
},
{
"name": "rules-configmap-reloader",
"usage": {
"cpu": "32015n",
"memory": "1780Ki"
}
},
{
"name": "prometheus-proxy",
"usage": {
"cpu": "2835n",
"memory": "5688Ki"
}
},
{
"name": "prometheus",
"usage": {
"cpu": "9060978n",
"memory": "438920Ki"
}
},
{
"name": "prometheus-config-reloader",
"usage": {
"cpu": "0",
"memory": "3556Ki"
}
}
]
}
```
!!! Troubleshooting
If kubectl get --raw "/apis/metrics.k8s.io/v1beta1/nodes" command returns empty response and metrics-server pod throw an error like
To fix the issue, you need to edit metrics-server-deployment.yaml and add the parameters below right after image: k8s.gcr.io/metrics-server-amd64:v0.3.1 line:
``
then re-apply it askubectl apply -f metrics-server-deployment.yaml`
After few seconds, you can get metrics via kubectl get --raw "/apis/metrics.k8s.io/v1beta1/nodes" or kubectl top node commands.