In v1.15.0, kubeadm introduced preliminary support for kubeadm upgrade node phases. Phases for other kubeadm upgrade sub-commands such as apply, could be added in the following releases.

kubeadm upgrade node phase

Using this phase you can choose to execute the separate steps of the upgrade of secondary control-plane or worker nodes. Please note that kubeadm upgrade apply still has to be called on a primary control-plane node.

Synopsis

Use this command to invoke single phase of the node workflow

Options

-h, --help
	help for phase

Options inherited from parent commands

--rootfs string
	[EXPERIMENTAL] The path to the 'real' host root filesystem.

Synopsis

Upgrade the control plane instance deployed on this node, if any

kubeadm upgrade node phase control-plane [flags]

Options

--certificate-renewal Default: true
	Perform the renewal of certificates used by component changed during upgrades.
--dry-run
	Do not change any state, just output the actions that would be performed.
--etcd-upgrade Default: true
	Perform the upgrade of etcd.
-k, --experimental-kustomize string
	The path where kustomize patches for static pod manifests are stored.
-h, --help
	help for control-plane
--kubeconfig string Default: "/etc/kubernetes/admin.conf"
	The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file.

Options inherited from parent commands

--rootfs string
	[EXPERIMENTAL] The path to the 'real' host root filesystem.

Synopsis

Download the kubelet configuration from a ConfigMap of the form “kubelet-config-1.X” in the cluster, where X is the minor version of the kubelet. kubeadm uses the KuberneteVersion field in the kubeadm-config ConfigMap to determine what the desired kubelet version is.

kubeadm upgrade node phase kubelet-config [flags]

Options

--dry-run
	Do not change any state, just output the actions that would be performed.
-h, --help
	help for kubelet-config
--kubeconfig string Default: "/etc/kubernetes/admin.conf"
	The kubeconfig file to use when talking to the cluster. If the flag is not set, a set of standard locations can be searched for an existing kubeconfig file.

Options inherited from parent commands

--rootfs string
	[EXPERIMENTAL] The path to the 'real' host root filesystem.

What’s next

kubeadm init to bootstrap a Kubernetes control-plane node
kubeadm join to connect a node to the cluster
kubeadm reset to revert any changes made to this host by kubeadm init or kubeadm join
kubeadm upgrade to upgrade a kubeadm node
kubeadm alpha to try experimental functionality

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