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kubeadm: Use etcd Learner to Join a Control Plane Node Safely


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The kubeadm tool now supports etcd learner mode, which allows you to enhance the resilience and stability of your Kubernetes clusters by leveraging the learner mode feature introduced in etcd version 3.4. This guide will walk you through using etcd learner mode with kubeadm. By default, kubeadm runs a local etcd instance on each control plane node.

In v1.27, kubeadm introduced a new feature gate EtcdLearnerMode. With this feature gate enabled, when joining a new control plane node, a new etcd member will be created as a learner and promoted to a voting member only after the etcd data are fully aligned...

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  • James changed the title to kubeadm: Use etcd Learner to Join a Control Plane Node Safely

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