How To Identify the Active Master Node in Platform9 Managed Kubernetes Cluster

Problem

Identify the active Master node in a Platform9 Managed Kubernetes cluster.

Environment

• Platform9 Managed Kubernetes - All Versions

Answer

1. Using the kube-scheduler or kube-controller-manager endpoints, identify the active Master node by referring to the holderIdentity.

None

# kubectl get endpoints kube-scheduler -n kube-system -o yaml

apiVersion: v1
kind: Endpoints
metadata:
annotations:
control-plane.alpha.kubernetes.io/leader: '{"holderIdentity":"master3_e848b2f6-471e-11ea-866a-fa163efa580e","leaseDurationSeconds":15,"acquireTime":"2020-02-05T06:25:26Z","renewTime":"2020-02-07T02:07:22Z","leaderTransitions":17}'
creationTimestamp: 2019-12-22T07:44:06Z
name: kube-scheduler
namespace: kube-system
resourceVersion: "7427816"
selfLink: /api/v1/namespaces/kube-system/endpoints/kube-scheduler
uid: d515ac87-248e-11ea-924f-fa163eef3a4b

None

# kubectl get endpoints kube-controller-manager -n kube-system -o yaml

apiVersion: v1
kind: Endpoints
metadata:
annotations:
control-plane.alpha.kubernetes.io/leader: '{"holderIdentity":"master3_e94b43cd-471e-11ea-adca-fa163efa580e","leaseDurationSeconds":15,"acquireTime":"2020-02-05T06:25:37Z","renewTime":"2020-02-07T02:08:03Z","leaderTransitions":17}'
creationTimestamp: 2019-12-22T07:44:08Z
name: kube-controller-manager
namespace: kube-system
resourceVersion: "7427889"
selfLink: /api/v1/namespaces/kube-system/endpoints/kube-controller-manager
uid: d6373c89-248e-11ea-924f-fa163eef3a4b