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    NodeProblemDetectorPlus Add-on

    Last updated: 2024-02-01 10:15:37
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      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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