Linux command
kubeadm 命令
安全
权限或系统影响较大，执行前请核对目标。
常用示例
Initialize control plane
sudo kubeadm init
Join worker node
sudo kubeadm join [control-plane:6443] --token [token] --discovery-token-ca-cert-hash [hash]
Create join token
kubeadm token create --print-join-command
Reset node
sudo kubeadm reset
Upgrade cluster
sudo kubeadm upgrade apply [v1.28.0]
Generate default config
kubeadm config print init-defaults
说明
kubeadm is the official Kubernetes cluster bootstrapping tool that automates the setup of a production-grade control plane. It handles the complex initialization process including generating TLS certificates for cluster components, configuring the kubelet, deploying the kube-apiserver, kube-controller-manager, and kube-scheduler as static pods, and installing cluster-essential add-ons like CoreDNS and kube-proxy. The workflow centers on two primary commands: `kubeadm init` to create a new control plane on the first node, and `kubeadm join` to add worker nodes or additional control plane nodes to an existing cluster using bootstrap tokens. The tool also manages cluster lifecycle operations such as upgrading Kubernetes versions across the cluster, rotating certificates, and resetting nodes back to a clean state. kubeadm follows Kubernetes best practices and conformance standards, but intentionally does not provision the underlying infrastructure or install a CNI network plugin, keeping it focused on cluster bootstrapping while remaining composable with other tools for complete cluster management.
参数
- init
- Initialize control plane.
- join _ENDPOINT_
- Join cluster as node.
- reset
- Reset node to pre-init state.
- upgrade
- Upgrade cluster components.
- token _CMD_
- Manage join tokens.
- config _CMD_
- Manage configuration.
- --help
- Display help information.
FAQ
What is the kubeadm command used for?
kubeadm is the official Kubernetes cluster bootstrapping tool that automates the setup of a production-grade control plane. It handles the complex initialization process including generating TLS certificates for cluster components, configuring the kubelet, deploying the kube-apiserver, kube-controller-manager, and kube-scheduler as static pods, and installing cluster-essential add-ons like CoreDNS and kube-proxy. The workflow centers on two primary commands: `kubeadm init` to create a new control plane on the first node, and `kubeadm join` to add worker nodes or additional control plane nodes to an existing cluster using bootstrap tokens. The tool also manages cluster lifecycle operations such as upgrading Kubernetes versions across the cluster, rotating certificates, and resetting nodes back to a clean state. kubeadm follows Kubernetes best practices and conformance standards, but intentionally does not provision the underlying infrastructure or install a CNI network plugin, keeping it focused on cluster bootstrapping while remaining composable with other tools for complete cluster management.
How do I run a basic kubeadm example?
Run `sudo kubeadm init` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does init do in kubeadm?
Initialize control plane.