aks-engine/examples/kubernetes-labels

Kubernetes Agent Node Labels

Labels can be defined for each agent node tye. The labels can then be used with Kubernetes deployments as label selectors

Labels can be easily defined in the AgentPoolProfile property of the API Model

The definition below adds 2 labels "bar" and "baz" to all nodes in the firstpool pool.

    "agentPoolProfiles": [
      {
        "name": "firstpool",
        "count": 3,
        "vmSize": "Standard_D2_v2",
        "availabilityProfile": "AvailabilitySet",
        "customNodeLabels": {
          "bar": "lulz",
          "baz": "foo"
        }
      }
    ],

In addition to any custom node labels you may add, ACS Engine will add another label, "agentpool", which identifies which Agent Pool the node belongs to.

You can confirm the labels have been applied on the node by running kubectl describe node <nodename>: