如何通过API获取kubernetes资源信息（总体CPU和内存使用情况）

Question

我已经在 VIM 中安装了 minikube，并且我拥有具有所有权限的服务帐户令牌。是否有来自 kubernetes 的 API 来获取资源使用情况（总体）。

Answer 1

如果您安装 kubernetes 指标服务器，它会将这些指标公开为 api https://github.com/kubernetes-incubator/metrics-server

Answer 2

要获取 CPU 和内存使用情况，您可以使用（取决于您喜欢查看的对象）以下内容：

kubectl top pods 要么 kubectl top nodes 这会告诉你

$ kubectl top pods
NAME                       CPU(cores)   MEMORY(bytes)
nginx-1-5d4f8f66d9-xmhnh   0m           1Mi

Api 参考可能如下所示：

$ curl http://localhost:8080/apis/metrics.k8s.io/v1beta1/pods

...
{
      "metadata": {
        "name": "nginx-1-5d4f8f66d9-xmhnh",
        "namespace": "default",
        "selfLink": "/apis/metrics.k8s.io/v1beta1/namespaces/default/pods/nginx-1-5d4f8f66d9-xmhnh",
        "creationTimestamp": "2019-07-29T11:48:13Z"
      },
      "timestamp": "2019-07-29T11:48:11Z",
      "window": "30s",
      "containers": [
        {
          "name": "nginx",
          "usage": {
            "cpu": "0",
            "memory": "1952Ki"
          }
        }
      ]
    }
...

至于API访问它的方法很少。

您可以通过运行 kubectl proxy --port:8080 &

使用 proxy

The following command runs kubectl in a mode where it acts as a reverse proxy. It handles locating the API server and authenticating.

See kubectl proxy for more details.

Then you can explore the API with curl, wget, or a browser, like so:

curl http://localhost:8080/api/

您可以使用身份验证令牌访问它without proxy。

It is possible to avoid using kubectl proxy by passing an authentication token directly to the API server, like this:

Using grep/cut approach:

# Check all possible clusters, as you .KUBECONFIG may have multiple contexts:
kubectl config view -o jsonpath='{"Cluster name\tServer\n"}{range .clusters[*]}{.name}{"\t"}{.cluster.server}{"\n"}{end}'

# Select name of cluster you want to interact with from above output:
export CLUSTER_NAME="some_server_name"

# Point to the API server refering the cluster name
APISERVER=$(kubectl config view -o jsonpath="{.clusters[?(@.name==\"$CLUSTER_NAME\")].cluster.server}")

# Gets the token value
TOKEN=$(kubectl get secrets -o jsonpath="{.items[?(@.metadata.annotations['kubernetes\.io/service-account\.name']=='default')].data.token}"|base64 -d)

# Explore the API with TOKEN
curl -X GET $APISERVER/api --header "Authorization: Bearer $TOKEN" --insecure

您还可以使用多个官方客户端库访问 API，例如 Go or Python. Other libraries are available to see here。

如何通过API获取kubernetes资源信息（总体CPU和内存使用情况）

How to get kubernetes resource information(overall CPU and memory usage) through APIs

kubernetes

google-kubernetes-engine

kubectl

minikube

kubernetes-pod