You are viewing documentation for Kubernetes version: v1.21
Kubernetes v1.21 documentation is no longer actively maintained. The version you are currently viewing is a static snapshot. For up-to-date documentation, see the latest version.
kubeadm upgrade
kubeadm upgrade is a user-friendly command that wraps complex upgrading logic
behind one command, with support for both planning an upgrade and actually performing it.
kubeadm upgrade guidance
The steps for performing a upgrade using kubeadm are outlined in this document. For older versions of kubeadm, please refer to older documentation sets of the Kubernetes website.
You can use kubeadm upgrade diff to see the changes that would be applied to static pod manifests.
In Kubernetes v1.15.0 and later, kubeadm upgrade apply and kubeadm upgrade node will also
automatically renew the kubeadm managed certificates on this node, including those stored in kubeconfig files.
To opt-out, it is possible to pass the flag --certificate-renewal=false. For more details about certificate
renewal see the certificate management documentation.
Note: The commandskubeadm upgrade applyandkubeadm upgrade planhave a legacy--configflag which makes it possible to reconfigure the cluster, while performing planning or upgrade of that particular control-plane node. Please be aware that the upgrade workflow was not designed for this scenario and there are reports of unexpected results.
kubeadm upgrade plan
Check which versions are available to upgrade to and validate whether your current cluster is upgradeable. To skip the internet check, pass in the optional [version] parameter
Synopsis
Check which versions are available to upgrade to and validate whether your current cluster is upgradeable. To skip the internet check, pass in the optional [version] parameter
kubeadm upgrade plan [version] [flags]
Options
| --allow-experimental-upgrades | |
Show unstable versions of Kubernetes as an upgrade alternative and allow upgrading to an alpha/beta/release candidate versions of Kubernetes. | |
| --allow-release-candidate-upgrades | |
Show release candidate versions of Kubernetes as an upgrade alternative and allow upgrading to a release candidate versions of Kubernetes. | |
| --config string | |
Path to a kubeadm configuration file. | |
| --feature-gates string | |
A set of key=value pairs that describe feature gates for various features. Options are: | |
| -h, --help | |
help for plan | |
| --ignore-preflight-errors strings | |
A list of checks whose errors will be shown as warnings. Example: 'IsPrivilegedUser,Swap'. Value 'all' ignores errors from all checks. | |
| --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. | |
| --print-config | |
Specifies whether the configuration file that will be used in the upgrade should be printed or not. | |
Options inherited from parent commands
| --rootfs string | |
[EXPERIMENTAL] The path to the 'real' host root filesystem. | |
kubeadm upgrade apply
Upgrade your Kubernetes cluster to the specified version
Synopsis
Upgrade your Kubernetes cluster to the specified version
kubeadm upgrade apply [version]
Options
| --allow-experimental-upgrades | |
Show unstable versions of Kubernetes as an upgrade alternative and allow upgrading to an alpha/beta/release candidate versions of Kubernetes. | |
| --allow-release-candidate-upgrades | |
Show release candidate versions of Kubernetes as an upgrade alternative and allow upgrading to a release candidate versions of Kubernetes. | |
| --certificate-renewal Default: true | |
Perform the renewal of certificates used by component changed during upgrades. | |
| --config string | |
Path to a kubeadm configuration file. | |
| --dry-run | |
Do not change any state, just output what actions would be performed. | |
| --etcd-upgrade Default: true | |
Perform the upgrade of etcd. | |
| --experimental-patches string | |
Path to a directory that contains files named "target[suffix][+patchtype].extension". For example, "kube-apiserver0+merge.yaml" or just "etcd.json". "patchtype" can be one of "strategic", "merge" or "json" and they match the patch formats supported by kubectl. The default "patchtype" is "strategic". "extension" must be either "json" or "yaml". "suffix" is an optional string that can be used to determine which patches are applied first alpha-numerically. | |
| --feature-gates string | |
A set of key=value pairs that describe feature gates for various features. Options are: | |
| -f, --force | |
Force upgrading although some requirements might not be met. This also implies non-interactive mode. | |
| -h, --help | |
help for apply | |
| --ignore-preflight-errors strings | |
A list of checks whose errors will be shown as warnings. Example: 'IsPrivilegedUser,Swap'. Value 'all' ignores errors from all checks. | |
| --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. | |
| --print-config | |
Specifies whether the configuration file that will be used in the upgrade should be printed or not. | |
| -y, --yes | |
Perform the upgrade and do not prompt for confirmation (non-interactive mode). | |
Options inherited from parent commands
| --rootfs string | |
[EXPERIMENTAL] The path to the 'real' host root filesystem. | |
kubeadm upgrade diff
Show what differences would be applied to existing static pod manifests. See also: kubeadm upgrade apply --dry-run
Synopsis
Show what differences would be applied to existing static pod manifests. See also: kubeadm upgrade apply --dry-run
kubeadm upgrade diff [version] [flags]
Options
| --api-server-manifest string Default: "/etc/kubernetes/manifests/kube-apiserver.yaml" | |
path to API server manifest | |
| --config string | |
Path to a kubeadm configuration file. | |
| -c, --context-lines int Default: 3 | |
How many lines of context in the diff | |
| --controller-manager-manifest string Default: "/etc/kubernetes/manifests/kube-controller-manager.yaml" | |
path to controller manifest | |
| -h, --help | |
help for diff | |
| --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. | |
| --scheduler-manifest string Default: "/etc/kubernetes/manifests/kube-scheduler.yaml" | |
path to scheduler manifest | |
Options inherited from parent commands
| --rootfs string | |
[EXPERIMENTAL] The path to the 'real' host root filesystem. | |
kubeadm upgrade node
Upgrade commands for a node in the cluster
Synopsis
Upgrade commands for a node in the cluster
The "node" command executes the following phases:
preflight Run upgrade node pre-flight checks
control-plane Upgrade the control plane instance deployed on this node, if any
kubelet-config Upgrade the kubelet configuration for this node
kubeadm upgrade node [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. | |
| --experimental-patches string | |
Path to a directory that contains files named "target[suffix][+patchtype].extension". For example, "kube-apiserver0+merge.yaml" or just "etcd.json". "patchtype" can be one of "strategic", "merge" or "json" and they match the patch formats supported by kubectl. The default "patchtype" is "strategic". "extension" must be either "json" or "yaml". "suffix" is an optional string that can be used to determine which patches are applied first alpha-numerically. | |
| -h, --help | |
help for node | |
| --ignore-preflight-errors strings | |
A list of checks whose errors will be shown as warnings. Example: 'IsPrivilegedUser,Swap'. Value 'all' ignores errors from all checks. | |
| --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. | |
| --skip-phases strings | |
List of phases to be skipped | |
Options inherited from parent commands
| --rootfs string | |
[EXPERIMENTAL] The path to the 'real' host root filesystem. | |
What's next
- kubeadm config if you initialized your cluster using kubeadm v1.7.x or lower, to configure your cluster for
kubeadm upgrade