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
• kubeadm create cluster

• 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

• v1.24, v1.23, v1.20 Use kubeadm to install a basic cluster
• v1.23 Perform a version upgrade on a Kubernetes cluster using kubeadm
• 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 | create | token | config | reset | version | upgrade | join | --help ], kubeadm.config.k8s.io

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Source: wikiversity