Kubeadm

kubeadm is a tool released in Kubernetes 1.13 in December 2018 for creating Kubernetes clusters.

• https://kubernetes.io/docs/reference/setup-tools/kubeadm/

Installation

• macOS: not homebrew package
• Ubuntu: snap install kubeadm --classic

Commands

• kubeadm --help
• kubeadm init to bootstrap a Kubernetes control-plane node
  • kubeadm init --pod-network-cidr=10.244.0.0/16
• kubeadm join to bootstrap a Kubernetes worker node and join it to the cluster
  • kubeadm join --control-plane
• kubeadm upgrade to upgrade a Kubernetes cluster to a newer version
• kubeadm config if you initialized your cluster using kubeadm v1.7.x or lower, to configure your cluster for kubeadm upgrade

kubeadm config images pull

• kubeadm token to manage tokens for kubeadm join
• kubeadm reset to revert any changes made to this host by kubeadm init or kubeadm join
• kubeadm version to print the kubeadm version
• kubeadm alpha to preview a set of features made available for gathering feedback from the community

• Logs not available in files https://github.com/kubernetes/kubernetes/pull/42470

Changelog

• v1.18 Kubeadm: reject a node joining the cluster if a node with the same name already exists

CKA

• v1.23 Perform a version upgrade on a Kubernetes cluster using kubeadm
• v1.23 Use kubeadm to install a basic cluster
• v1.20 Use kubeadm to install a basic cluster
• v1.18 Install and use kubeadm to install, configure and manage Kubernetes clusters.

Related terms

• kubectl
• Snap install Kubernetes: snap install kubeadm --classic
• CNI, CSI
• Deploy EKS cluster using Terraform
• k9s

See also

• kubeadm [ init | token | config | reset | version | upgrade | join | --help ]
• Kubernetes: distributions, tools, CKA, CKS, Kubernetes interfaces: CSI, CNI, installation, workloads, networking, kubeadm, Kubernetes API, Kubernetes API Server, kubectl, kubeadm, kubelet, kube-proxy, Cloud services: EKS, GKE, TKE, DKS, Helm, Kubernetes RBAC, Kubernetes deployments, Minikube, Rancher, OpenShift, Charmed Kubernetes, Ingress, Kubernetes scheduler, Kubernetes Finalizers, logging, Kubernetes operator, Orka, kind:, Kubernetes namespaces, Kubernetes dashboard, Kubernetes Metrics Server, Field Selectors, CoreDNS, CRI, Kubernetes Topology Manager, Kubernetes governance: (SIG, KEP), Kustomize, controllers, ReadinessProbe, LivenessProbe, KOPS, K9s, Kui, k3s, ImagePullBackOff, PDB, EndPoints, Kots, metadata, Karpenter, Replicated.com, Kubernetes Authenticating, Kubernetes timeline, Changelog/Versions, service accounts, Kubernetes Pod Lifecycle, Kubernetes Conformance Certified, Kubernetes backup, Kubernetes Pod Security Admission, tEKS, Kubernetes events, Kubernetes ports, Kubernetes policies, Connect, addons, DoKC, Kubernetes control plane, Kubernetes Federation, Kubernetes info, Kubetest2, Sidecar (Kubernetes)

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Source: wikiversity