How to Determine the Rancher Leader, in Rancher v2.x

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Situation

Task

During troubleshooting it may be useful to know which of the Rancher server pods, running as part of the rancher Deployment in the cattle-system namespace, is the current leader, and this article details the steps to determine this.

Pre-requisites

Rancher v2.x installed in a Kubernetes cluster

Steps

Via the Rancher UI

The cattle-controllers ConfigMap under the kube-system namespace

Navigate to the local cluster in which Rancher is installed.
Click the Projects/Namespaces tab, and select the System project.
Under the Resources tab, select Config.
Locate the cattle-controllers ConfigMap, under the kube-system namespace.
Expand the Labels & Annotations section and note the current leader pod name in the holderIdentity field.

Via kubectl with a script

With the kubeconfig for the Rancher server cluster sourced, the leader can be determined using the following script:

curl https://raw.githubusercontent.com/rancherlabs/support-tools/master/troubleshooting-scripts/determine-leader/rancher2_determine_leader.sh | sh

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.