Node Problem Detector Add-on

node-problem-detector makes common Kubernetes node problems visible to the cluster management stack. It is a daemon which runs on each node, detects problems, and reports them to the apiserver.

For more details on the Kubernetes node-problem-detector, see the GitHub project.

The following is a sample API definition with the node-problem-detector addon enabled.

{
  "apiVersion": "vlabs",
  "properties": {
    "orchestratorProfile": {
      "orchestratorType": "Kubernetes",
      "kubernetesConfig": {
        "addons": [
          {
            "name": "node-problem-detector",
            "enabled": true
          }
        ]
      }
    },
    "masterProfile": {
      "count": 1,
      "dnsPrefix": "",
      "vmSize": "Standard_DS2_v2"
    },
    "agentPoolProfiles": [
      {
        "name": "agentpool",
        "count": 3,
        "vmSize": "Standard_DS2_v2",
        "availabilityProfile": "AvailabilitySet"
      }
    ],
    "linuxProfile": {
      "adminUsername": "azureuser",
      "ssh": {
        "publicKeys": [
          {
            "keyData": ""
          }
        ]
      }
    },
    "servicePrincipalProfile": {
      "clientId": "",
      "secret": ""
    }
  }
}

You can validate that the add-on is running as expected with the following command. You should see a node-problem-detector pod running for each agent node in the cluster.

kubectl get pods -n kube-system

To test node-problem-detector in a running cluster, you can inject messages into the logs it is watching. See Try It Out in the node-problem-detector documentation for details.

Configuration

Name	Required	Description	Default Value
customPluginMonitor	no	Comma-separated list of custom plugin monitor config files	/config/kernel-monitor-counter.json,/config/systemd-monitor-counter.json
systemLogMonitor	no	Comma-separated list of system log monitor config files	/config/kernel-monitor.json,/config/docker-monitor.json,/config/systemd-monitor.json
systemStatsMonitor	no	Comma-separated list of system stats monitor config files	/config/system-stats-monitor.json
versionLabel	no	Version label used as DaemonSet selector	v0.8.4