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": {
      "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": ""
          }
        ]
      }
    }
  }
}

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

Node Problem Detector

Name	Required	Description	Default Value
name	no	container name	"node-problem-detector"
image	no	image	"registry.k8s.io/node-problem-detector:v0.8.1"
cpuRequests	no	cpu requests for the container	"20m"
memoryRequests	no	memory requests for the container	"20Mi"
cpuLimits	no	cpu limits for the container	"200m"
memoryLimits	no	memory limits for the container	"100Mi"

Supported Orchestrators

Kubernetes

Contact

• If you have any questions or feedback regarding the node-problem-detector addon, please file an issue at https://github.com/Azure/aks-engine-azurestack/issues