kubeadm-init
kubeadm init - Control Plane Initialization
Overview
kubeadm init bootstraps the Kubernetes control plane through 14 automated phases.
Core principle: Understand each phase before troubleshooting. Certificate, network, and kubelet issues are traced to specific phases.
When to Use
- Initializing a new Kubernetes cluster
- Troubleshooting control plane bootstrap failures
- Understanding certificate generation and static pod deployment
- Planning HA control plane setup
The 14 Phases
kubeadm init phases (sequential):
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rke2-operations
Use when managing RKE2 cluster certificates, performing manual or automated version upgrades, rotating TLS certificates, deploying the System Upgrade Controller, or troubleshooting RKE2 certificate and upgrade errors. Use when seeing "x509 certificate has expired" or "CertificateExpirationWarning" events or "Job has reached the specified backoff limit" errors.
3rke2-deployment
Use when deploying Kubernetes clusters with RKE2 (Rancher Kubernetes Engine 2), configuring server and agent nodes, managing built-in Helm chart addons, or setting up CIS-hardened clusters. Use when seeing "rke2-server failed to start" or "unable to join cluster" errors.
3kubeadm-troubleshooting
Use when kubeadm init fails, join fails, nodes show NotReady, pods stuck Pending, certificate errors, or kubelet crashlooping
3cluster-api
Use when managing Kubernetes clusters as Kubernetes resources with Cluster API (CAPI), provisioning workload clusters from a management cluster, performing declarative upgrades, or working with ClusterClass blueprints. Use when seeing "failed to connect to management cluster" or clusterctl errors.
2kubespray-airgap
Use when deploying Kubernetes in air-gapped or offline environments using kubespray-offline tool, setting up private container registries, staging binaries and images for offline use, configuring containerd registry mirrors, or troubleshooting image pull failures in isolated networks.
2kubeadm-join
Use when joining worker or control-plane nodes to a Kubernetes cluster, troubleshooting TLS bootstrap, or debugging node join failures
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