はじめに
kube-capacityを使って、KubernetesのResource limitとrequestを一覧で取得したり、合計値を取得したりする方法を紹介します。
kube-capacityとは
kube-capacityとは、Resource limitやrequest、その使用率などを取得できるCLIになります。
GitHub - robscott/kube-capacity: A simple CLI that provides an overview of the resource requests, limits, and utilization in a Kubernetes cluster
A simple CLI that provides an overview of the resource requests, limits, and utilization in a Kubernetes cluster - GitHub - robscott/kube-capacity: A simple CLI...
github.com
インストール
brewを使ったインストールは下記の通りです。
brew tap robscott/tap
brew install robscott/tap/kube-capacitykrewを使ってもインストールできます。
kubectl krew install resource-capacity使い方
簡単にkube-capacityの使い方を紹介します。
クラスタとノードのリソース
デフォルトでは、クラスタのResource limitとrequestの合計と各ノードのResource limitとrequestが表示されます。
kube-capacity❯ kube-capacity
NODE CPU REQUESTS CPU LIMITS MEMORY REQUESTS MEMORY LIMITS
docker-desktop 1325m (33%) 375m (9%) 696Mi (8%) 596Mi (7%)括弧の中のパーセント表示は利用可能なリソースと比べてどのくらいの割合であるかを表しています。
Podのリソース
-pか--podsでPodごとのResource limitとrequestも確認できます。
kube-capacity -p❯ kube-capacity -p -n default
NODE POD CPU REQUESTS CPU LIMITS MEMORY REQUESTS MEMORY LIMITS
docker-desktop * 375m (9%) 375m (9%) 256Mi (3%) 256Mi (3%)
docker-desktop myapp1-5cdd4bc574-4x2k4 225m (5%) 225m (5%) 160Mi (2%) 160Mi (2%)
docker-desktop myapp2-d5b4df486-zqvtr 150m (3%) 150m (3%) 96Mi (1%) 96Mi (1%)コンテナのリソース
-cか--containersでPodの中のコンテナごとのResource limitとrequestを確認できます。
kube-capacity -c❯ kube-capacity -c -n default
NODE POD CONTAINER CPU REQUESTS CPU LIMITS MEMORY REQUESTS MEMORY LIMITS
docker-desktop * * 375m (9%) 375m (9%) 256Mi (3%) 256Mi (3%)
docker-desktop myapp1-5cdd4bc574-4x2k4 * 225m (5%) 225m (5%) 160Mi (2%) 160Mi (2%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container1 50m (1%) 50m (1%) 32Mi (0%) 32Mi (0%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container2 100m (2%) 100m (2%) 64Mi (0%) 64Mi (0%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container3 75m (1%) 75m (1%) 64Mi (0%) 64Mi (0%)
docker-desktop myapp2-d5b4df486-zqvtr * 150m (3%) 150m (3%) 96Mi (1%) 96Mi (1%)
docker-desktop myapp2-d5b4df486-zqvtr container1 50m (1%) 50m (1%) 32Mi (0%) 32Mi (0%)
docker-desktop myapp2-d5b4df486-zqvtr container2 100m (2%) 100m (2%) 64Mi (0%) 64Mi (0%)利用状況
-uか--utilでリソースの利用状況を確認できます。
kube-capacity -u❯ kube-capacity -c -u -n default
NODE POD CONTAINER CPU REQUESTS CPU LIMITS CPU UTIL MEMORY REQUESTS MEMORY LIMITS MEMORY UTIL
docker-desktop * * 375m (9%) 375m (9%) 0m (0%) 256Mi (3%) 256Mi (3%) 1Mi (0%)
docker-desktop myapp1-5cdd4bc574-4x2k4 * 225m (5%) 225m (5%) 0m (0%) 160Mi (2%) 160Mi (2%) 1Mi (0%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container1 50m (1%) 50m (1%) 0m (0%) 32Mi (0%) 32Mi (0%) 1Mi (0%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container2 100m (2%) 100m (2%) 0m (0%) 64Mi (0%) 64Mi (0%) 1Mi (0%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container3 75m (1%) 75m (1%) 0m (0%) 64Mi (0%) 64Mi (0%) 1Mi (0%)
docker-desktop myapp2-d5b4df486-zqvtr * 150m (3%) 150m (3%) 0m (0%) 96Mi (1%) 96Mi (1%) 1Mi (0%)
docker-desktop myapp2-d5b4df486-zqvtr container1 50m (1%) 50m (1%) 0m (0%) 32Mi (0%) 32Mi (0%) 1Mi (0%)
docker-desktop myapp2-d5b4df486-zqvtr container2 100m (2%) 100m (2%) 0m (0%) 64Mi (0%) 64Mi (0%) 1Mi (0%)利用可能なリソース
-aか--availableでノードの利用可能なリソースを表示した形式になります。
kube-capacity --available❯ kube-capacity -a
NODE CPU REQUESTS CPU LIMITS MEMORY REQUESTS MEMORY LIMITS
docker-desktop 2675m/4000m 3625m/4000m 7164Mi/7860Mi 7264Mi/7860Miソート
--sortで各リソースや名前でソートすることができます。（デフォルトは名前です）
kube-capacity --sort [name|cpu.request|cpu.limit|cpu.util|mem.request|mem.limit|mem.util]❯ kube-capacity -c --sort cpu.limit -n default
NODE POD CONTAINER CPU REQUESTS CPU LIMITS MEMORY REQUESTS MEMORY LIMITS
docker-desktop * * 375m (9%) 375m (9%) 256Mi (3%) 256Mi (3%)
docker-desktop myapp1-5cdd4bc574-4x2k4 * 225m (5%) 225m (5%) 160Mi (2%) 160Mi (2%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container2 100m (2%) 100m (2%) 64Mi (0%) 64Mi (0%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container3 75m (1%) 75m (1%) 64Mi (0%) 64Mi (0%)
docker-desktop myapp1-5cdd4bc574-4x2k4 container1 50m (1%) 50m (1%) 32Mi (0%) 32Mi (0%)
docker-desktop myapp2-d5b4df486-zqvtr * 150m (3%) 150m (3%) 96Mi (1%) 96Mi (1%)
docker-desktop myapp2-d5b4df486-zqvtr container2 100m (2%) 100m (2%) 64Mi (0%) 64Mi (0%)
docker-desktop myapp2-d5b4df486-zqvtr container1 50m (1%) 50m (1%) 32Mi (0%) 32Mi (0%)Pod数
--pod-countでクラスタやノードのPodの数を表示できます。
kube-capacity --pod-count❯ kube-capacity --pod-count
NODE CPU REQUESTS CPU LIMITS MEMORY REQUESTS MEMORY LIMITS POD COUNT
docker-desktop 1325m (33%) 375m (9%) 696Mi (8%) 596Mi (7%) 12/110
