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NodeProblemDetectorPlus Add-on

Terakhir diperbarui:2024-02-01 10:15:37

    Overview

    Add-on description

    Node-Problem-Detector-Plus is an add-on that monitors the health status of Kubernetes cluster nodes. It runs in the TKE environment as a DaemonSet to help users detect various exceptions on nodes in real time and report the detection results to the upstream Kube-apiserver.

    Kubernetes objects deployed in a cluster

    Kubernetes Object Name
    Type
    Resource Amount
    Namespaces
    node-problem-detector
    DaemonSet
    0.5C 80M
    kube-system
    node-problem-detector
    ServiceAccount
    -
    kube-system
    node-problem-detector
    ClusterRole
    -
    -
    node-problem-detector
    ClusterRoleBinding
    -
    -

    Use Cases

    Node-Problem-Detector-Plus can be used to monitor the running status of nodes, including kernel deadlocks, OOM, system thread pressure, system file descriptor pressure, and other metrics. It reports such information to the API Server as Node Conditions and Events. You can estimate the resource pressure of nodes by detecting the corresponding metrics and then manually release or scale out node resources before nodes start draining pods. In this way, you can prevent potential losses resulted from Kubernetes resource repossessing or node unavailability.

    Limits

    To use NPD in your cluster, you need to install this add-on in your cluster. The system resources used by NPD containers is restricted to 0.5 CPU core and 80 MB memory.

    Component Permission Description

    Permission Description

    The permission of this component is the minimal dependency required for the current feature to operate.

    Permission Scenarios

    Feature
    Involved Object
    Involved Operation Permission
    It is required to report fault information when a node encounters a malfunction and modify its condition.
    nodestatus
    patch
    It is required to send event notifications to the cluster.
    event
    create/patch/update

    Permission Definition

    rules:
    - apiGroups:
    - ""
    resources:
    - nodes
    verbs:
    - get
    - apiGroups:
    - ""
    resources:
    - nodes/status
    verbs:
    - patch
    - apiGroups:
    - ""
    resources:
    - events
    verbs:
    - create
    - patch
    - update

    Usage

    1. Log in to the TKE console and select Cluster in the left sidebar.
    2. On the “Cluster Management page, click the ID of the target cluster to go to the cluster details page.
    3. In the left sidebar, click Add-on Management to go to the Add-on List page.
    4. On the Add-on List page, click Create to go to the Create Add-on page, and select NodeProblemDetectorPlus.
    5. Click Complete. After the installation is successful, the corresponding node-problem-detector resources are available in your cluster, and the corresponding conditions will be added to Node Conditions.

    Appendix

    Node Conditions

    After the NPD plug-in is installed, the following specific Conditions will be added to nodes:
    Condition
    Default Value
    Description
    ReadonlyFilesystem
    False
    Indicates whether the file system is read-only.
    FDPressure
    False
    Queries whether the number of file descriptors of the host reaches 80% of the max value.
    FrequentKubeletRestart
    False
    Indicates whether Kubelet has restarted more than 5 times in 20 minutes.
    CorruptDockerOverlay2
    False
    Indicates whether the DockerImage is faulty.
    KubeletProblem
    False
    Indicates whether the Kubelet service is Running.
    KernelDeadlock
    False
    Indicates whether a deadlock exists in the kernel.
    FrequentDockerRestart
    False
    Indicates whether Docker has restarted more than 5 times in 20 minutes.
    FrequentContainerdRestart
    False
    Indicates whether Containerd has restarted more than 5 times in 20 minutes.
    DockerdProblem
    False
    Indicates whether the Docker service is Running (if the node runtime is Containerd, the value is always False).
    ContainerdProblem
    False
    Indicates whether the Containerd service is Running (if the node runtime is Docker, the value is always False).
    ThreadPressure
    False
    Indicates whether the current number of threads of the system reaches 90% of the max value.
    NetworkUnavailable
    False
    Indicates whether the NTP service status is Running.
    SerfFailed
    False
    Detects the node network health status in distributed mode.
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