概要
kubectl top コマンドを使用すると、ノードまたはポッドのリソース消費量(CPU/メモリ)を確認できるコマンド
minikubeをインストールしただけでは使えませんが、アドオンのmetrics-serverを有効にするだけで使用できます。
metrics-server を設定する
アドオンが有効でないとコマンドを実行してもエラーになります
tech-0222@MSI:~$ kubectl top pod
error: Metrics API not available
tech-0222@MSI:~$
tech-0222@MSI:~$ kubectl top nodes
error: Metrics API not available
tech-0222@MSI:~$"minikube addons enable metrics-server"でアドオンを有効にしてみる
tech-0222@MSI:~$ minikube addons enable metrics-server
💡 metrics-server is an addon maintained by Kubernetes. For any concerns contact minikube on GitHub.
You can view the list of minikube maintainers at: https://github.com/kubernetes/minikube/blob/master/OWNERS
▪ Using image registry.k8s.io/metrics-server/metrics-server:v0.6.4
🌟 The 'metrics-server' addon is enabled
tech-0222@MSI:~$アドオンを有効にするとmetrics-server関連のPodが起動してきます
※ここで少し待ちます
tech-0222@MSI:~$ kubectl get po -A
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-5dd5756b68-jbjsr 1/1 Running 2 (6d ago) 39d
kube-system etcd-minikube 1/1 Running 2 (6d ago) 39d
kube-system kube-apiserver-minikube 1/1 Running 2 (6d ago) 39d
kube-system kube-controller-manager-minikube 1/1 Running 2 (6d ago) 39d
kube-system kube-proxy-g5lrv 1/1 Running 2 (6d ago) 39d
kube-system kube-scheduler-minikube 1/1 Running 2 (6d ago) 39d
kube-system metrics-server-7c66d45ddc-cjwdk 0/1 Running 0 67s ★これ
kube-system storage-provisioner 1/1 Running 5 (6d ago) 39d
tech-0222@MSI:~$minikubeの設定でもアドオン用のProfile（minikube）が作成され、
minikube addons list で metrics-server が enabled なのが確認できますね
tech-0222@MSI:~$ minikube profile list
|--------------|-----------|------------|--------------|------|---------|---------|-------|--------|
| Profile | VM Driver | Runtime | IP | Port | Version | Status | Nodes | Active |
|--------------|-----------|------------|--------------|------|---------|---------|-------|--------|
| minikube | docker | docker | 192.168.58.2 | 8443 | v1.28.3 | Stopped | 1 | |
| test | docker | containerd | 192.168.67.2 | 8443 | v1.28.3 | Running | 1 | * |
|--------------|-----------|------------|--------------|------|---------|---------|-------|--------|
tech-0222@MSI:~$
tech-0222@MSI:~$ minikube addons list
|-----------------------------|----------|--------------|--------------------------------|
| ADDON NAME | PROFILE | STATUS | MAINTAINER |
|-----------------------------|----------|--------------|--------------------------------|
| ambassador | minikube | disabled | 3rd party (Ambassador) |
| auto-pause | minikube | disabled | minikube |
| cloud-spanner | minikube | disabled | Google |
| csi-hostpath-driver | minikube | disabled | Kubernetes |
| dashboard | minikube | disabled | Kubernetes |
| default-storageclass | minikube | enabled ✅ | Kubernetes |
| efk | minikube | disabled | 3rd party (Elastic) |
| freshpod | minikube | disabled | Google |
| gcp-auth | minikube | disabled | Google |
| gvisor | minikube | disabled | minikube |
| headlamp | minikube | disabled | 3rd party (kinvolk.io) |
| helm-tiller | minikube | disabled | 3rd party (Helm) |
| inaccel | minikube | disabled | 3rd party (InAccel |
| | | | [info@inaccel.com]) |
| ingress | minikube | disabled | Kubernetes |
| ingress-dns | minikube | disabled | minikube |
| inspektor-gadget | minikube | disabled | 3rd party |
| | | | (inspektor-gadget.io) |
| istio | minikube | disabled | 3rd party (Istio) |
| istio-provisioner | minikube | disabled | 3rd party (Istio) |
| kong | minikube | disabled | 3rd party (Kong HQ) |
| kubeflow | minikube | disabled | 3rd party |
| kubevirt | minikube | disabled | 3rd party (KubeVirt) |
| logviewer | minikube | disabled | 3rd party (unknown) |
| metallb | minikube | disabled | 3rd party (MetalLB) |
| metrics-server | minikube | enabled ✅ | Kubernetes |
| nvidia-device-plugin | minikube | disabled | 3rd party (NVIDIA) |
| nvidia-driver-installer | minikube | disabled | 3rd party (Nvidia) |
| nvidia-gpu-device-plugin | minikube | disabled | 3rd party (Nvidia) |
| olm | minikube | disabled | 3rd party (Operator Framework) |
| pod-security-policy | minikube | disabled | 3rd party (unknown) |
| portainer | minikube | disabled | 3rd party (Portainer.io) |
| registry | minikube | disabled | minikube |
| registry-aliases | minikube | disabled | 3rd party (unknown) |
| registry-creds | minikube | disabled | 3rd party (UPMC Enterprises) |
| storage-provisioner | minikube | enabled ✅ | minikube |
| storage-provisioner-gluster | minikube | disabled | 3rd party (Gluster) |
| storage-provisioner-rancher | minikube | disabled | 3rd party (Rancher) |
| volumesnapshots | minikube | disabled | Kubernetes |
|-----------------------------|----------|--------------|--------------------------------|
💡 To see addons list for other profiles use: `minikube addons -p name list`
tech-0222@MSI:~$リソース消費量(CPU/メモリ)を確認してみる
Node、Podのリソース消費量(CPU/メモリ)がtopコマンドで確認できるようになってますね
tech-0222@MSI:~$ kubectl top nodes
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
minikube 302m 1% 827Mi 5%
tech-0222@MSI:~$
tech-0222@MSI:~$ kubectl top po -A
NAMESPACE NAME CPU(cores) MEMORY(bytes)
kube-system coredns-5dd5756b68-44v8z 2m 54Mi
kube-system etcd-minikube 10m 370Mi
kube-system kube-apiserver-minikube 24m 316Mi
kube-system kube-controller-manager-minikube 15m 128Mi
kube-system kube-proxy-ktwhc 1m 60Mi
kube-system kube-scheduler-minikube 2m 64Mi
kube-system metrics-server-7c66d45ddc-vp7xz 2m 51Mi
kube-system storage-provisioner 3m 9Mi
tech-0222@MSI:~$Podのコンテナ単位も表示したい場合は以下で確認できます
tech-0222@MSI:~$ kubectl top po -A --containers=true
NAMESPACE POD NAME CPU(cores) MEMORY(bytes)
kube-system coredns-5dd5756b68-44v8z coredns 1m 58Mi
kube-system etcd-minikube etcd 10m 377Mi
kube-system kube-apiserver-minikube kube-apiserver 22m 331Mi
kube-system kube-controller-manager-minikube kube-controller-manager 8m 121Mi
kube-system kube-proxy-ktwhc kube-proxy 1m 60Mi
kube-system kube-scheduler-minikube kube-scheduler 2m 65Mi
kube-system metrics-server-7c66d45ddc-vp7xz metrics-server 2m 59Mi
kube-system storage-provisioner storage-provisioner 2m 15Mi
tech-0222@MSI:~$
#1PODのコンテナは以下
tech-0222@MSI:~$ kubectl top po etcd-minikube --containers -n kube-system
POD NAME CPU(cores) MEMORY(bytes)
etcd-minikube etcd 10m 377Mi
tech-0222@MSI:~$
オプションで使用量が多いい順番に並び替えもできますね
tech-0222@MSI:~$ kubectl top po -A --sort-by=cpu
NAMESPACE NAME CPU(cores) MEMORY(bytes)
kube-system kube-apiserver-minikube 21m 331Mi
kube-system etcd-minikube 10m 374Mi
kube-system kube-controller-manager-minikube 8m 121Mi
kube-system coredns-5dd5756b68-44v8z 2m 57Mi
kube-system kube-scheduler-minikube 2m 65Mi
kube-system metrics-server-7c66d45ddc-vp7xz 2m 58Mi
kube-system storage-provisioner 2m 15Mi
kube-system kube-proxy-ktwhc 1m 60Mi
tech-0222@MSI:~$ kubectl top po -A --sort-by=memory
NAMESPACE NAME CPU(cores) MEMORY(bytes)
kube-system etcd-minikube 10m 375Mi
kube-system kube-apiserver-minikube 22m 331Mi
kube-system kube-controller-manager-minikube 8m 121Mi
kube-system kube-scheduler-minikube 2m 65Mi
kube-system kube-proxy-ktwhc 1m 60Mi
kube-system metrics-server-7c66d45ddc-vp7xz 2m 58Mi
kube-system coredns-5dd5756b68-44v8z 1m 57Mi
kube-system storage-provisioner 2m 15Mi
tech-0222@MSI:~$オプションで合計も出せるみたい
tech-0222@MSI:~$ kubectl top po -A --sum
NAMESPACE NAME CPU(cores) MEMORY(bytes)
kube-system coredns-5dd5756b68-44v8z 2m 57Mi
kube-system etcd-minikube 10m 377Mi
kube-system kube-apiserver-minikube 21m 331Mi
kube-system kube-controller-manager-minikube 8m 121Mi
kube-system kube-proxy-ktwhc 1m 60Mi
kube-system kube-scheduler-minikube 2m 65Mi
kube-system metrics-server-7c66d45ddc-vp7xz 2m 59Mi
kube-system storage-provisioner 1m 15Mi
________ ________
43m 1088Mi
tech-0222@MSI:~$
