Murre:一个轻量化的K8S监控工具

常规的K8s指标监控方法

选择轻量化

Kubelet是什么？

深入Kubelet源码

• /metrics/resource：该接口列出容器资源(CPU，内存)，和cadvisor接口类似，但也提供pod级和节点级资源使用情况。
• /stats/summary：该接口以JSON格式提供聚合的资源消耗数据。默认情况下，它将描述所有资源(CPU、内存、文件系统和网络，就像cadvisor接口一样)，但是你可以传递一个only_cpu_and_memory=true的标志作为请求参数，则只获得CPU和内存数据。
  下面是接口的响应结构:

type Summary struct {
    // Overall node stats.
    Node NodeStats `json:"node"`
    // Per-pod stats.
    Pods []PodStats `json:"pods"`
}

// NodeStats holds node-level unprocessed sample stats.
type NodeStats struct {
    // Reference to the measured Node.
    NodeName string `json:"nodeName"`
    // Stats of system daemons tracked as raw containers.
    // The system containers are named according to the SystemContainer* constants.
    SystemContainers []ContainerStats `json:"systemContainers,omitempty" patchStrategy:"merge" patchMergeKey:"name"`
    // The time at which data collection for the node-scoped (i.e. aggregate) stats was (re)started.
    StartTime metav1.Time `json:"startTime"`
    // Stats pertaining to CPU resources.
    CPU *CPUStats `json:"cpu,omitempty"`
    // Stats pertaining to memory (RAM) resources.
    Memory *MemoryStats `json:"memory,omitempty"`
    // Stats pertaining to network resources.
    Network *NetworkStats `json:"network,omitempty"`
    // Stats pertaining to total usage of filesystem resources on the rootfs used by node k8s components.
    // NodeFs.Used is the total bytes used on the filesystem.
    Fs *FsStats `json:"fs,omitempty"`
    // Stats about the underlying container runtime.
    Runtime *RuntimeStats `json:"runtime,omitempty"`
    // Stats about the rlimit of system.
    Rlimit *RlimitStats `json:"rlimit,omitempty"`
}

// PodStats holds pod-level unprocessed sample stats.
type PodStats struct {
    // Reference to the measured Pod.
    PodRef PodReference `json:"podRef"`
    // The time at which data collection for the pod-scoped (e.g. network) stats was (re)started.
    StartTime metav1.Time `json:"startTime"`
    // Stats of containers in the measured pod.
    Containers []ContainerStats `json:"containers" patchStrategy:"merge" patchMergeKey:"name"`
    // Stats pertaining to CPU resources consumed by pod cgroup (which includes all containers' resource usage and pod overhead).
    CPU *CPUStats `json:"cpu,omitempty"`
    // Stats pertaining to memory (RAM) resources consumed by pod cgroup (which includes all co

• /pods：该接口提供有关在节点上运行的pod的信息，以及完整的pod规格和状态。还可以使用K8s客户端的podLister接口获取该数据。虽然有用，但这个特定的数据与我们的资源度量监控无关。
• /metrics：这个接口公开了与Kubelet自己的内部统计数据相关的指标。了解下就可以了，它不会用于我们的需求。

现在看看Murre项目

项目地址：